TWI642045B - Low power consumption source driving circuit and liquid crystal display with same - Google Patents
Low power consumption source driving circuit and liquid crystal display with same Download PDFInfo
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Abstract
一種低功耗源極驅動電路,具有一第一開關、一第一閂鎖器、一第二開關、一第二閂鎖器、一第三開關、一第四開關、一第三閂鎖器及一驅動單元,用以將一1-點翻轉的像素電壓資料串列轉換成一2-點翻轉的像素電壓資料串列,且該2-點翻轉的像素電壓資料串列係藉由複數個閘極驅動信號之一作用順序驅動一液晶顯示器,以使該液晶顯示器具有1-點翻轉的顯示效果。A low power consumption source driving circuit includes a first switch, a first latch, a second switch, a second latch, a third switch, a fourth switch, and a third latch. And a driving unit for converting a 1-point inverted pixel voltage data string into a 2-point inverted pixel voltage data string, and the 2-point inverted pixel voltage data string is obtained by a plurality of gates One of the pole driving signals sequentially drives a liquid crystal display so that the liquid crystal display has a 1-point flip display effect.
Description
本發明係關於一種應用於液晶顯示器之源極驅動電路,特別是關於一種應用於液晶顯示器之低功耗源極驅動電路。The present invention relates to a source driving circuit applied to a liquid crystal display, and more particularly to a low power source driving circuit applied to a liquid crystal display.
圖1為一傳統的液晶顯示驅動電路圖。如圖1所示,一液晶顯示器(liquid crystal display;LCD)20係依一閘極驅動電路所提供的複數個閘極驅動信號VG1-VGn及一源極驅動電路的複數個源極驅動單元10所提供的複數個類比驅動信號VS1-VSn產生一畫面,其中,類比驅動信號VS1-VSn係依一電壓資料信號SPIX產生。FIG. 1 is a diagram of a conventional liquid crystal display driving circuit. As shown in FIG. 1, a liquid crystal display (LCD) 20 is a plurality of gate driving signals VG1-VGn provided by a gate driving circuit and a plurality of source driving units 10 of a source driving circuit. The provided analog driving signals VS1-VSn generate a picture, wherein the analog driving signals VS1-VSn are generated according to a voltage data signal SPIX.
如圖1所示,液晶顯示器(liquid crystal display;LCD)20中的每一個像素22都是由一個薄膜電晶體(thin film transistor,TFT)21控制,而每一行薄膜電晶體21的閘極均通過一水平掃描線與複數個閘極驅動信號VG1-VGn中的一個驅動信號耦接,且每一列薄膜電晶體21的源極均通過一垂直掃描線與複數個類比驅動信號VS1-VSn中的一個驅動信號耦接。As shown in FIG. 1, each pixel 22 in a liquid crystal display (LCD) 20 is controlled by a thin film transistor (TFT) 21, and the gates of each row of thin film transistors 21 are A horizontal scanning line is coupled to one of the gate driving signals VG1-VGn, and the source of each column of thin-film transistors 21 passes a vertical scanning line to the analog driving signals VS1-VSn. A driving signal is coupled.
於操作時,所述閘極驅動電路會依序導通一行薄膜電晶體21,而源極驅動電路會提供類比驅動信號VS1-VSn以將需要顯示的資料電壓送入對應的一行像素22中,從而顯示一畫面。During operation, the gate driving circuit will sequentially turn on a row of thin film transistors 21, and the source driving circuit will provide analog driving signals VS1-VSn to send the data voltage to be displayed to the corresponding row of pixels 22, thereby A screen is displayed.
另外,加在液晶分子上的電場是有方向性的,在不同的幀(frame)期間內以相反的電壓加在液晶分子上稱為極性翻轉。雖然圖像信號只與加在液晶分子上的電壓有關而與它的正負無關,但是仍然需要極性翻轉的操作。原因在於:一、由於液晶顯示器的取向膜具有直流阻絕效應,因此,液晶必須以交流信號驅動;二、若一直以同一種極性驅動液晶分子,液晶分子會變失效而出現“直流殘留”現象,從而導致在顯示過程中出現殘影。In addition, the electric field applied to the liquid crystal molecules is directional. Applying the opposite voltage to the liquid crystal molecules during different frame periods is called polarity reversal. Although the image signal is only related to the voltage applied to the liquid crystal molecules and has nothing to do with its sign, it still needs the operation of polarity inversion. The reasons are: First, because the alignment film of the liquid crystal display has a DC blocking effect, the liquid crystal must be driven by an AC signal; Second, if the liquid crystal molecules are driven with the same polarity all the time, the liquid crystal molecules will fail and a "DC residual" phenomenon will occur. As a result, afterimages appear during the display process.
雖然每一個液晶分子需要採用極性翻轉的方式來驅動,但就一個陣列的像素面板而言,卻不一定要以相同的極性來驅動。按照相鄰像素的極性來分類,極性翻轉的方式可分為幀翻轉(frame inversion)、列翻轉(column inversion)、行翻轉(row inversion)及點翻轉(dot inversion)。請參照圖2a-2c,其分別為1-點翻轉(1-dot inversion)、2-點翻轉(2-dot inversion)及列翻轉的示意圖。Although each liquid crystal molecule needs to be driven by polarity inversion, as far as a pixel panel of an array is not necessarily driven by the same polarity. According to the polarity of adjacent pixels, the polarity inversion methods can be divided into frame inversion, column inversion, row inversion, and dot inversion. Please refer to FIGS. 2a-2c, which are schematic diagrams of 1-dot inversion, 2-dot inversion, and column inversion, respectively.
在1-點翻轉、2-點翻轉及列翻轉的比較中,由於同一列的像素電壓是由同一資料線在不同時刻送入的,因此對於同一列像素而言,翻轉的次數越多,所消耗的功耗就越大,但是顯示效果也越來越好。因此在設計時顯示效果和功耗是一對折衷(trade off)關係。In the comparison of 1-point inversion, 2-point inversion, and column inversion, since the pixel voltage of the same column is sent at the same time by the same data line, for the same column of pixels, the more the number of inversions, the The larger the power consumption, the better the display effect. Therefore, the display effect and power consumption are a trade-off relationship at design time.
圖3為一傳統源極驅動電路的電路圖。如圖3所示,該傳統源極驅動電路包括一第一閂鎖器31、一第二閂鎖器32、一數位-類比轉換器33、一運算放大器34及一輸出開關35,以依一像素電壓資料信號SPIX所傳輸的一1-點翻轉的像素電壓資料串列產生正、負極性交替翻轉的一類比驅動信號SOUT,其中數位-類比轉換器33、運算放大器34及輸出開關35構成一驅動單元。FIG. 3 is a circuit diagram of a conventional source driving circuit. As shown in FIG. 3, the conventional source driving circuit includes a first latch 31, a second latch 32, a digital-to-analog converter 33, an operational amplifier 34, and an output switch 35. A 1-point inverted pixel voltage data series transmitted by the pixel voltage data signal SPIX generates an analog driving signal SOUT that alternates positive and negative polarity. The digital-to-analog converter 33, the operational amplifier 34, and the output switch 35 constitute an Drive unit.
於操作時,假設所述的1-點翻轉的像素電壓資料串列為A+,B-,C+,D-,E+,F-,G+,H-,…,其中“+”代表正電壓,“-”代表負電壓,也就是說,A+代表電壓值為A的正電壓,B-代表電壓值為B的負電壓,依此類推,則圖3之傳統源極驅動電路之操作流程,請參照圖4a-4c,可分解為:During operation, it is assumed that the 1-point flipped pixel voltage data series is A +, B-, C +, D-, E +, F-, G +, H-, ..., where "+" represents a positive voltage, " -"Represents a negative voltage, that is, A + represents a positive voltage with a voltage value of A, B- represents a negative voltage with a voltage value of B, and so on. For the operation flow of the traditional source driving circuit in Figure 3, please refer to Figures 4a-4c can be broken down into:
步驟1:在時刻1,像素電壓資料A+被第一閂鎖器31鎖存;Step 1: At time 1, the pixel voltage data A + is latched by the first latch 31;
步驟2:在時刻2,一第1行G1的薄膜電晶體被導通以使第一閂鎖器31中的A+被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料A+產生類比驅動信號SOUT以驅動一液晶電容,同時B-被第一閂鎖器31鎖存;Step 2: At time 2, a thin film transistor in the first row G1 is turned on so that A + in the first latch 31 is latched by the second latch 32 and the driving unit generates an analog based on the pixel voltage data A + Driving signal SOUT to drive a liquid crystal capacitor, and B- is latched by the first latch 31;
步驟3:在時刻3,一第2行G2的薄膜電晶體被導通以使第一閂鎖器31中的B-被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料B-產生類比驅動信號SOUT以驅動一液晶電容,同時C+被第一閂鎖器31鎖存;Step 3: At time 3, a thin film transistor in the second row G2 is turned on so that B- in the first latch 31 is latched by the second latch 32 and the driving unit is based on the pixel voltage data B- Generating an analog driving signal SOUT to drive a liquid crystal capacitor, and C + is latched by the first latch 31;
步驟4:在時刻4,一第3行G3的薄膜電晶體被導通以使第一閂鎖器31中的C+被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料C+產生類比驅動信號SOUT以驅動一液晶電容,同時D-被第一閂鎖器31鎖存;Step 4: At time 4, a thin film transistor in the third row G3 is turned on so that C + in the first latch 31 is latched by the second latch 32 and the driving unit generates an analog based on the pixel voltage data C + Driving signal SOUT to drive a liquid crystal capacitor, and D- is latched by the first latch 31;
步驟5:在時刻5,一第4行G4的薄膜電晶體被導通以使第一閂鎖器31中的D-被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料D-產生類比驅動信號SOUT以驅動一液晶電容,同時E+被第一閂鎖器31鎖存;Step 5: At time 5, a thin film transistor in the fourth row G4 is turned on so that D- in the first latch 31 is latched by the second latch 32 and the driving unit is based on the pixel voltage data D- Generating an analog driving signal SOUT to drive a liquid crystal capacitor, and E + is latched by the first latch 31;
步驟6:在時刻6,一第5行G5的薄膜電晶體被導通以使第一閂鎖器31中的E+被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料E+產生類比驅動信號SOUT以驅動一液晶電容,同時F-被第一閂鎖器31鎖存;Step 6: At time 6, a thin film transistor in the fifth row G5 is turned on so that E + in the first latch 31 is latched by the second latch 32 and the driving unit generates an analog based on the pixel voltage data E +. Driving signal SOUT to drive a liquid crystal capacitor, and F- is latched by the first latch 31;
步驟7:在時刻7,一第6行G6的薄膜電晶體被導通以使第一閂鎖器31中的F-被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料F-產生類比驅動信號SOUT以驅動一液晶電容,同時G+被第一閂鎖器31鎖存;Step 7: At time 7, a thin film transistor of the sixth row G6 is turned on so that F- in the first latch 31 is latched by the second latch 32 and the driving unit is based on the pixel voltage data F- Generating an analog driving signal SOUT to drive a liquid crystal capacitor, and G + is latched by the first latch 31;
步驟8:在時刻8,一第7行G7的薄膜電晶體被導通以使第一閂鎖器31中的G+被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料G+產生類比驅動信號SOUT以驅動一液晶電容,同時H-被第一閂鎖器31鎖存;Step 8: At time 8, a thin film transistor of the seventh row G7 is turned on so that G + in the first latch 31 is latched by the second latch 32 and the driving unit generates an analog based on the pixel voltage data G + Driving signal SOUT to drive a liquid crystal capacitor, and H- is latched by the first latch 31;
步驟9:在時刻9,一第8行G8的薄膜電晶體被導通以使第一閂鎖器31中的H-被第二閂鎖器32鎖存並使該驅動單元依像素電壓資料H-產生類比驅動信號SOUT以驅動一液晶電容,同時I+被第一閂鎖器31鎖存;依次類推。Step 9: At time 9, a thin film transistor in the 8th row G8 is turned on so that H- in the first latch 31 is latched by the second latch 32 and the driving unit is based on the pixel voltage data H- An analog driving signal SOUT is generated to drive a liquid crystal capacitor, and I + is latched by the first latch 31; and so on.
依上述操作流程,類比驅動信號SOUT即可提供極性規律為(+),(-),(+),(-),(+),(-),(+),(-)…的供電順序以提供1-點翻轉的顯示效果。然而,如前所述,對於同一列像素而言,翻轉的次數越多,源極驅動電路所消耗的功耗就越大。According to the above operation flow, the analog driving signal SOUT can provide the power supply sequence with the polarity regularity (+), (-), (+), (-), (+), (-), (+), (-) ... To provide a 1-point flip display. However, as mentioned above, for the same column of pixels, the more the number of flips, the more power is consumed by the source driving circuit.
因此本領域亟需一新穎的低功耗源極驅動結構。Therefore, there is an urgent need in the art for a novel low power source drive structure.
本發明之主要目的在於揭露一種應用於液晶顯示器之低功耗源極驅動電路,其係用2-點翻轉的驅動方式實現1-點翻轉的顯示效果,以利用低功耗的驅動方式實現好的顯示效果。The main purpose of the present invention is to disclose a low-power source driving circuit applied to a liquid crystal display, which uses a 2-point inversion driving method to realize a 1-point inversion display effect, and uses a low-power driving method to achieve good performance. Display effect.
為達前述目的,一種低功耗源極驅動電路乃被提出,其具有:To achieve the foregoing object, a low-power source driving circuit is proposed, which has:
一第一開關,具有一第一控制端及一第一通道,該第一控制端係與一第一切換信號耦接,該第一通道具有一第一輸入端及一第一輸出端,該第一輸入端係用以與一像素電壓資料信號耦接,該像素電壓資料信號係用以傳輸一1-點翻轉的像素電壓資料串列;A first switch has a first control terminal and a first channel. The first control terminal is coupled to a first switching signal. The first channel has a first input terminal and a first output terminal. The first input terminal is used for coupling with a pixel voltage data signal, and the pixel voltage data signal is used for transmitting a 1-point flipped pixel voltage data series;
一第一閂鎖器,具有一第一閂鎖輸入端及一第一閂鎖輸出端,該第一閂鎖輸入端係與該第一輸出端耦接;A first latch device having a first latch input end and a first latch output end, the first latch input end is coupled with the first output end;
一第二開關,具有一第二控制端及一第二通道,該第二控制端係與一第二切換信號耦接,該第二通道具有一第二輸入端及一第二輸出端,該第二輸入端係用以與該像素電壓資料信號耦接;A second switch has a second control terminal and a second channel. The second control terminal is coupled to a second switching signal. The second channel has a second input terminal and a second output terminal. The second input terminal is used for coupling with the pixel voltage data signal;
一第二閂鎖器,具有一第二閂鎖輸入端及一第二閂鎖輸出端,該第二閂鎖輸入端係與該第二輸出端耦接;A second latch device having a second latch input end and a second latch output end, the second latch input end is coupled with the second output end;
一第三開關,具有一第三控制端及一第三通道,該第三控制端係與一第三切換信號耦接,該第三通道具有一第三輸入端及一第三輸出端,該第三輸入端係與該第一閂鎖輸出端耦接;A third switch has a third control terminal and a third channel. The third control terminal is coupled to a third switching signal. The third channel has a third input terminal and a third output terminal. The third input terminal is coupled to the first latch output terminal;
一第四開關,具有一第四控制端及一第四通道,該第四控制端係與一第四切換信號耦接,該第四通道具有一第四輸入端及一第四輸出端,該第四輸入端係與該第二閂鎖輸出端耦接;A fourth switch has a fourth control terminal and a fourth channel. The fourth control terminal is coupled to a fourth switching signal. The fourth channel has a fourth input terminal and a fourth output terminal. A fourth input terminal is coupled to the second latch output terminal;
一第三閂鎖器,具有一第三閂鎖輸入端及一第三閂鎖輸出端,該第三閂鎖輸入端係與該第三輸出端及該第四輸出端耦接;以及A third latch having a third latch input and a third latch output, the third latch input is coupled to the third output and the fourth output; and
一驅動單元,具有一第五輸入端及一第五輸出端,該第五輸入端係與該第三閂鎖輸出端耦接,且該第五輸出端係用以依該第三閂鎖輸出端的一數位資料信號產生一類比驅動信號;A driving unit has a fifth input terminal and a fifth output terminal. The fifth input terminal is coupled to the third latch output terminal, and the fifth output terminal is used to output according to the third latch. A digital data signal at the end generates an analog driving signal;
其中,該第一切換信號、該第二切換信號、該第三切換信號及該第四切換信號係依一工作時序以分別控制該第一閂鎖器、該第二閂鎖器及該第三閂鎖器,以使該第三閂鎖輸出端輸出一2-點翻轉的像素電壓資料串列。The first switching signal, the second switching signal, the third switching signal, and the fourth switching signal respectively control the first latch, the second latch, and the third according to a working sequence. The latch, so that the third latch output terminal outputs a 2-point inverted pixel voltage data string.
在一實施例中,該驅動單元具有:In one embodiment, the driving unit has:
一數位-類比轉換器,具有一數位輸入端及一類比輸出端,該數位輸入端係與該該第三閂鎖輸出端耦接;A digital-to-analog converter having a digital input terminal and an analog output terminal, the digital input terminal is coupled to the third latch output terminal;
一運算放大器,具有一運算輸入端及一運算輸出端,該運算輸入端係與該類比輸出端耦接;以及An operational amplifier having an operational input and an operational output, the operational input being coupled to the analog output; and
一輸出開關,係耦接於該運算輸出端與該第五輸出端之間以控制該類比驅動信號之輸出。An output switch is coupled between the operation output terminal and the fifth output terminal to control the output of the analog driving signal.
在一實施例中,該2-點翻轉的像素電壓資料串列係藉由複數個閘極驅動信號之一作用順序驅動一液晶顯示器,以使該液晶顯示器具有1-點翻轉的顯示效果。In one embodiment, the 2-point inversion pixel voltage data series sequentially drives a liquid crystal display by one of a plurality of gate driving signals, so that the liquid crystal display has a 1-point inversion display effect.
在一實施例中,該作用順序係將第4K個和第4K-1個所述閘極驅動信號的作用時間對調,K為正整數。In an embodiment, the action sequence is that the action times of the gate driving signals of the 4Kth and 4K-1 are reversed, and K is a positive integer.
為達前述目的,一種液晶顯示器乃被提出,其具有如前述之低功耗源極驅動電路。In order to achieve the foregoing object, a liquid crystal display has been proposed, which has the aforementioned low-power source driving circuit.
為使 貴審查委員能進一步瞭解本發明之結構、特徵及其目的,茲附以圖式及較佳具體實施例之詳細說明如後。In order to enable your reviewers to further understand the structure, characteristics, and purpose of the present invention, drawings and detailed descriptions of the preferred embodiments are attached below.
請參照圖5,其繪示本發明之低功耗源極驅動電路之一實施例電路圖。如圖5所示,該低功耗源極驅動電路具有一第一開關101、一第一閂鎖器102、一第二開關103、一第二閂鎖器104、一第三開關105、一第四開關106、一第三閂鎖器107及一驅動單元110。Please refer to FIG. 5, which illustrates a circuit diagram of an embodiment of a low power source driving circuit according to the present invention. As shown in FIG. 5, the low-power source driving circuit includes a first switch 101, a first latch 102, a second switch 103, a second latch 104, a third switch 105, and a The fourth switch 106, a third latch 107, and a driving unit 110.
第一開關101具有一第一控制端及一第一通道,該第一控制端係與一第一切換信號SW 1耦接,該第一通道具有一第一輸入端及一第一輸出端,該第一輸入端係用以與一像素電壓資料信號S PIX耦接,該像素電壓資料信號S PIX係用以傳輸一1-點翻轉的像素電壓資料串列。 The first switch 101 has a first control terminal and a first channel. The first control terminal is coupled to a first switching signal SW 1. The first channel has a first input terminal and a first output terminal. The first input terminal is used for coupling with a pixel voltage data signal SPIX , and the pixel voltage data signal SPIX is used for transmitting a 1-point inverted pixel voltage data series.
第一閂鎖器102具有一第一閂鎖輸入端及一第一閂鎖輸出端,該第一閂鎖輸入端係與第一開關101之所述第一輸出端耦接。The first latch 102 has a first latch input and a first latch output. The first latch input is coupled to the first output of the first switch 101.
第二開關103具有一第二控制端及一第二通道,該第二控制端係與一第二切換信號SW 2耦接,該第二通道具有一第二輸入端及一第二輸出端,該第二輸入端係用以與該像素電壓資料信號耦接S PIX。 The second switch 103 has a second control terminal and a second channel. The second control terminal is coupled to a second switching signal SW 2. The second channel has a second input terminal and a second output terminal. The second input terminal is used for coupling with the pixel voltage data signal SPIX .
第二閂鎖器104具有一第二閂鎖輸入端及一第二閂鎖輸出端,該第二閂鎖輸入端係與第二開關103之所述第二輸出端耦接。The second latch 104 has a second latch input and a second latch output. The second latch input is coupled to the second output of the second switch 103.
第三開關105具有一第三控制端及一第三通道,該第三控制端係與一第三切換信號SW 3耦接,該第三通道具有一第三輸入端及一第三輸出端,該第三輸入端係與該第一閂鎖輸出端耦接。 The third switch 105 has a third control terminal and a third channel. The third control terminal is coupled to a third switching signal SW 3. The third channel has a third input terminal and a third output terminal. The third input terminal is coupled to the first latch output terminal.
第四開關106具有一第四控制端及一第四通道,該第四控制端係與一第四切換信號SW 4耦接,該第四通道具有一第四輸入端及一第四輸出端,該第四輸入端係與該第二閂鎖輸出端耦接。 The fourth switch 106 has a fourth control terminal and a fourth channel. The fourth control terminal is coupled to a fourth switching signal SW 4. The fourth channel has a fourth input terminal and a fourth output terminal. The fourth input terminal is coupled to the second latch output terminal.
第三閂鎖器107具有一第三閂鎖輸入端及一第三閂鎖輸出端,該第三閂鎖輸入端係與第三開關105之所述第三輸出端及第四開關106之所述第四輸出端耦接。The third latch 107 has a third latch input and a third latch output. The third latch input is connected to the third output of the third switch 105 and the fourth switch 106. The fourth output terminal is coupled.
驅動單元110具有一第五輸入端及一第五輸出端,該第五輸入端係與該第三閂鎖輸出端耦接,且該第五輸出端係用以依該第三閂鎖輸出端的一數位資料信號產生一類比驅動信號S OUT。 The driving unit 110 has a fifth input terminal and a fifth output terminal. The fifth input terminal is coupled to the third latch output terminal, and the fifth output terminal is used to connect the third latch output terminal. A digital data signal generates an analog drive signal S OUT .
在圖5的實施例中,驅動單元110具有一數位-類比轉換器111、一運算放大器112及一輸出開關113。In the embodiment of FIG. 5, the driving unit 110 includes a digital-to-analog converter 111, an operational amplifier 112, and an output switch 113.
數位-類比轉換器111具有一數位輸入端及一類比輸出端,該數位輸入端係與該該第三閂鎖輸出端耦接,該類比輸出端係與運算放大器112耦接。The digital-to-analog converter 111 has a digital input terminal and an analog output terminal. The digital input terminal is coupled to the third latch output terminal, and the analog output terminal is coupled to the operational amplifier 112.
運算放大器112具有一運算輸入端及一運算輸出端,該運算輸入端係與該類比輸出端耦接。The operational amplifier 112 has an operational input and an operational output. The operational input is coupled to the analog output.
輸出開關113係耦接於該運算輸出端與該第五輸出端之間以控制該類比驅動信號S OUT之輸出。 The output switch 113 is coupled between the operation output terminal and the fifth output terminal to control the output of the analog driving signal S OUT .
於操作時,該第一切換信號SW 1、該第二切換信號SW 2、該第三切換信號SW 3及該第四切換信號SW 4係依一工作時序分別控制第一閂鎖器102、第二閂鎖器104及第三閂鎖器107,以使該第三閂鎖輸出端輸出一2-點翻轉的像素電壓資料串列。另外,該2-點翻轉的像素電壓資料串列係藉由複數個閘極驅動信號之一作用順序驅動一液晶顯示器,以使該液晶顯示器具有1-點翻轉的顯示效果,在一實施例中,該作用順序係將第4K個和第4K-1個所述閘極驅動信號的作用時間對調,K為正整數。 During operation, the first switching signal SW 1 , the second switching signal SW 2 , the third switching signal SW 3 and the fourth switching signal SW 4 control the first latch 102 and the first latch 102 respectively according to a working sequence. The two latches 104 and the third latch 107 enable the third latch output terminal to output a 2-point inverted pixel voltage data series. In addition, the 2-point inversion pixel voltage data series drives a liquid crystal display in sequence by one of a plurality of gate driving signals, so that the liquid crystal display has a 1-point inversion display effect. In one embodiment, , The action sequence is to reverse the action time of the gate driving signals of the 4Kth and 4K-1, and K is a positive integer.
舉例而言,假設所述的1-點翻轉的像素電壓資料串列為A+,B-,C+,D-, E+,F-,G+,H-,…,其中“+”代表正電壓,“-”代表負電壓,也就是說,A+代表電壓值為A的正電壓,B-代表電壓值為B的負電壓,依此類推,則依第一切換信號SW 1、第二切換信號SW 2、第三切換信號SW 3及第四切換信號SW 4的所述工作時序及所述複數個閘極驅動信號之所述作用順序,圖5之低功耗源極驅動電路之操作,請參照圖6a-6c,可分解為 : For example, suppose that the 1-point flipped pixel voltage data series is A +, B-, C +, D-, E +, F-, G +, H-, ..., where "+" represents a positive voltage, "-"Represents a negative voltage, that is, A + represents a positive voltage with a voltage value of A, B- represents a negative voltage with a voltage value of B, and so on, according to the first switching signal SW 1 and the second switching signal SW 2 The operation timing of the third switching signal SW 3 and the fourth switching signal SW 4 and the action sequence of the plurality of gate driving signals. For the operation of the low power source driving circuit in FIG. 5, please refer to FIG. 6a-6c, can be broken down into :
步驟1:在時刻1,第一切換信號SW 1導通第一開關101以使像素電壓資料A+被第一閂鎖器 102鎖存; Step 1: At time 1, the first switching signal turns on the first switch SW 1 101 to the pixel data A + is the voltage of the first latch 102 latches;
步驟2:在時刻2,第二切換信號SW 2導通第二開關103以使像素電壓資料B-被第二閂鎖器104鎖存; Step 2: 2, 103 so that the pixel data voltage B- is a second latch 104 latches the second switching signal of the second switch SW 2 is turned on at a time;
步驟3:在時刻3,閘極驅動信號V G1導通一第1行薄膜電晶體,第三切換信號SW 3導通第三開關105以使第一閂鎖器102中的像素電壓資料A+被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料A+產生類比驅動信號S OUT以驅動一液晶電容,同時第一切換信號SW 1導通第一開關101以使像素電壓資料C+被第一閂鎖器102鎖存; Step 3: At time 3, the gate driving signal V G1 turns on a thin film transistor in the first row, and the third switching signal SW 3 turns on the third switch 105 so that the pixel voltage data A + in the first latch 102 is changed by the third The latch 107 latches and causes the driving unit 110 to generate an analog driving signal S OUT according to the pixel voltage data A + to drive a liquid crystal capacitor. At the same time, the first switching signal SW 1 turns on the first switch 101 so that the pixel voltage data C + is The latch 102 is latched;
步驟4:在時刻4,閘極驅動信號V G2導通一第2行薄膜電晶體,第四切換信號SW 4導通第四開關106以使第二閂鎖器104中的像素電壓資料B-被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料B-產生類比驅動信號S OUT以驅動一液晶電容,同時第二切換信號SW 2導通第二開關103以使像素電壓資料D-被第二閂鎖器104鎖存; Step 4: At time 4, the gate driving signal V G2 turns on a thin film transistor in the second row, and the fourth switching signal SW 4 turns on the fourth switch 106 to enable the pixel voltage data B- in the second latch 104 to be turned on. The three latches 107 latch and cause the driving unit 110 to generate an analog driving signal S OUT according to the pixel voltage data B- to drive a liquid crystal capacitor, and at the same time, the second switching signal SW 2 turns on the second switch 103 to enable the pixel voltage data D- Latched by the second latch 104;
步驟5:在時刻5,閘極驅動信號V G4導通一第4行薄膜電晶體,第四切換信號SW 4導通第四開關106以使第二閂鎖器104中的像素電壓資料D-被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料D-產生類比驅動信號S OUT以驅動一液晶電容,同時第二切換信號SW 2導通第二開關103以使像素電壓資料E+被第二閂鎖器104鎖存; Step 5: At time 5, the gate driving signal V G4 turns on a fourth row of thin film transistors, and the fourth switching signal SW 4 turns on the fourth switch 106 to enable the pixel voltage data D- in the second latch 104 to be turned on. The three latches 107 latch and cause the driving unit 110 to generate an analog driving signal S OUT according to the pixel voltage data D- to drive a liquid crystal capacitor, and at the same time, the second switching signal SW 2 turns on the second switch 103 to enable the pixel voltage data E + to be The second latch 104 is latched;
步驟6:在時刻6,閘極驅動信號V G3導通一第3行薄膜電晶體,第三切換信號SW 3導通第三開關105以使第一閂鎖器102中的像素電壓資料C+被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料C+產生類比驅動信號S OUT以驅動一液晶電容,同時第一切換信號SW 1導通第一開關101以使像素電壓資料F-被第一閂鎖器102鎖存; Step 6: At time 6, the gate driving signal V G3 turns on a third row of thin film transistors, and the third switching signal SW 3 turns on the third switch 105 so that the pixel voltage data C + in the first latch 102 is third The latch 107 latches and causes the driving unit 110 to generate an analog driving signal S OUT to drive a liquid crystal capacitor according to the pixel voltage data C +, and at the same time, the first switching signal SW 1 turns on the first switch 101 to make the pixel voltage data F- A latch 102 is latched;
步驟7:在時刻7,閘極驅動信號V G5導通一第5行薄膜電晶體,第四切換信號SW 4導通第四開關106以使第二閂鎖器104中的像素電壓資料E+被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料E+產生類比驅動信號S OUT以驅動一液晶電容,同時第二切換信號SW 2導通第二開關103以使像素電壓資料G+被第二閂鎖器104鎖存; Step 7: At time 7, the gate driving signal V G5 turns on a fifth row of thin film transistors, and the fourth switching signal SW 4 turns on the fourth switch 106 so that the pixel voltage data E + in the second latch 104 is third. The latch 107 latches and causes the driving unit 110 to generate an analog driving signal S OUT to drive a liquid crystal capacitor according to the pixel voltage data E +, and at the same time, the second switching signal SW 2 turns on the second switch 103 so that the pixel voltage data G + is The latch 104 is latched;
步驟8:在時刻8,閘極驅動信號V G6導通一第6行薄膜電晶體,第三切換信號SW 3導通第三開關105以使第一閂鎖器102中的像素電壓資料F-被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料F-產生類比驅動信號S OUT以驅動一液晶電容,同時第一切換信號SW 1導通第一開關101以使像素電壓資料H-被第一閂鎖器102鎖存; Step 8: At time 8, the gate driving signal V G6 turns on a thin film transistor in the sixth row, and the third switching signal SW 3 turns on the third switch 105 to enable the pixel voltage data F- in the first latch 102 to be turned on. The three latches 107 latch and cause the driving unit 110 to generate an analog driving signal S OUT according to the pixel voltage data F- to drive a liquid crystal capacitor, and at the same time, the first switching signal SW 1 turns on the first switch 101 to enable the pixel voltage data H- Latched by the first latch 102;
步驟9:在時刻9,閘極驅動信號V G8導通一第8行薄膜電晶體,第三切換信號SW 3導通第三開關105以使第一閂鎖器102中的像素電壓資料H-被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料H-產生類比驅動信號S OUT以驅動一液晶電容,同時第一切換信號SW 1導通第一開關101以使像素電壓資料I+被第一閂鎖器102鎖存; Step 9: At time 9, the gate driving signal V G8 turns on an 8th thin film transistor, and the third switching signal SW 3 turns on the third switch 105 so that the pixel voltage data H- in the first latch 102 is The three latches 107 latch and cause the driving unit 110 to generate an analog driving signal S OUT according to the pixel voltage data H- to drive a liquid crystal capacitor, and at the same time, the first switching signal SW 1 turns on the first switch 101 so that the pixel voltage data I + is The first latch 102 is latched;
步驟10:在時刻10,閘極驅動信號V G7導通一第7行薄膜電晶體,第四切換信號SW 4導通第四開關106以使第二閂鎖器104中的像素電壓資料G+被第三閂鎖器107鎖存,並使驅動單元110依像素電壓資料G+產生類比驅動信號S OUT以驅動一液晶電容,同時第二切換信號SW 2導通第二開關103以使像素電壓資料J-被第二閂鎖器104鎖存;依次類推。 Step 10: At time 10, the gate driving signal V G7 turns on a thin film transistor of the seventh row, and the fourth switching signal SW 4 turns on the fourth switch 106 so that the pixel voltage data G + in the second latch 104 is third The latch 107 latches and causes the driving unit 110 to generate an analog driving signal S OUT to drive a liquid crystal capacitor according to the pixel voltage data G +, and at the same time, the second switching signal SW 2 turns on the second switch 103 to make the pixel voltage data J- The two latches 104 latch; and so on.
依上述方法,本發明之低功耗源極驅動電路即可以2點翻轉的供電方式使像素陣列所獲得的實際驅動效果等於1-點翻轉供電所獲得的驅動效果,從而使一液晶顯示器在採用所述低功耗源極驅動電路的情況下具有良好的顯示效果。According to the above method, the low-power source driving circuit of the present invention can use a 2-point inversion power supply mode to make the actual driving effect obtained by the pixel array equal to the driving effect obtained by 1-point inversion power supply, so that a liquid crystal display is used. In the case of the low power consumption source driving circuit, the display effect is good.
本案所揭示者,乃較佳實施例,舉凡局部之變更或修飾而源於本案之技術思想而為熟習該項技藝之人所易於推知者,俱不脫本案之專利權範疇。What is disclosed in this case is a preferred embodiment. For example, those who have partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by those skilled in the art, do not depart from the scope of patent rights in this case.
綜上所陳,本案無論就目的、手段與功效,在在顯示其迥異於習知之技術特徵,且其首先發明合於實用,亦在在符合發明之專利要件,懇請 貴審查委員明察,並祈早日賜予專利,俾嘉惠社會,實感德便。To sum up, regardless of the purpose, method and effect, this case is showing its technical characteristics that are quite different from the conventional ones, and its first invention is practical, and it is also in line with the patent requirements of the invention. Granting patents at an early date will benefit society and feel good.
10‧‧‧源極驅動單元
20‧‧‧液晶顯示器
21‧‧‧薄膜電晶體
22‧‧‧像素
31‧‧‧第一閂鎖器
32‧‧‧第二閂鎖器
33‧‧‧數位-類比轉換器
34‧‧‧運算放大器
35‧‧‧輸出開關
101‧‧‧第一開關
102‧‧‧第一閂鎖器
103‧‧‧第二開關
104‧‧‧第二閂鎖器
105‧‧‧第三開關
106‧‧‧第四開關
107‧‧‧第三閂鎖器
110‧‧‧驅動單元
111‧‧‧數位-類比轉換器
112‧‧‧運算放大器
113‧‧‧輸出開關10‧‧‧Source driver unit
20‧‧‧ LCD
21‧‧‧ thin film transistor
22‧‧‧ pixels
31‧‧‧First latch
32‧‧‧Second latch
33‧‧‧ Digital-to-Analog Converter
34‧‧‧ Operational Amplifier
35‧‧‧Output switch
101‧‧‧The first switch
102‧‧‧First latch
103‧‧‧Second switch
104‧‧‧Second latch
105‧‧‧Third switch
106‧‧‧Fourth switch
107‧‧‧The third latch
110‧‧‧Drive unit
111‧‧‧ Digital-to-Analog Converter
112‧‧‧ Operational Amplifier
113‧‧‧Output switch
圖1為一傳統的液晶顯示驅動電路圖。 圖2a-2c分別為1-點翻轉(1-dot inversion)、2-點翻轉(2-dot inversion)及列翻轉的示意圖。 圖3為一傳統源極驅動電路的電路圖。 圖4a-4c繪示圖3之傳統源極驅動電路之操作流程。 圖5繪示本發明之低功耗源極驅動電路之一實施例電路圖。 圖6a-6c繪示圖5之低功耗源極驅動電路之操作流程。FIG. 1 is a diagram of a conventional liquid crystal display driving circuit. Figures 2a-2c are schematic diagrams of 1-dot inversion, 2-dot inversion, and column inversion, respectively. FIG. 3 is a circuit diagram of a conventional source driving circuit. 4a-4c illustrate the operation flow of the conventional source driving circuit of FIG. FIG. 5 is a circuit diagram of an embodiment of a low power source driving circuit according to the present invention. 6a-6c illustrate the operation flow of the low power source driving circuit of FIG.
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TW201501112A (en) * | 2013-06-24 | 2015-01-01 | Orise Technology Co Ltd | Source driver with reduced number of latch devices |
US20150325184A1 (en) * | 2014-05-06 | 2015-11-12 | Novatek Microelectronics Corp. | Source driver, driving circuit and display apparatus |
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