CN101493617B - Drive deivce for TFT LCD - Google Patents

Abstract

The invention relates to a driving device of a film transistor liquid crystal display. A grid signal wire and a common electrode signal wire are connected by a triode formed by TFT; i.e., during the scanning and driving process of one frame of signals, a high-voltage signal is inserted before the next line is opened, equivalently, the black frame is inserted under a normal-white mode; when one line of the pixels are in use, the next line forcibly inserts the black frame data on the next line by the triode formed by the previous line of TFT; the driving device of the film transistor liquid crystal display firstly applies the high voltage forcibly before the next line of the TFT LCD pixels are opened, so as to achieve the object of inserting the black frame, thus effectively reducing the tailing phenomenon of the moving images.

Description

The drive unit of Thin Film Transistor-LCD

Technical field

The present invention relates to a kind of drive unit of Thin Film Transistor-LCD, especially relate between a kind of signal line and the common electrode signal line drive unit that forms the Thin Film Transistor-LCD that triode is connected by TFT.

Background technology

Present Thin Film Transistor-LCD (Thin Film transistor liquid crystaldisplay, abbreviation TFT LCD) drive unit, usually adopt normal white mode design, promptly when applying voltage, pixel electrode produces black picture, and the design that when not applying voltage, keeps light transmission.Fig. 8 is that prior art TFT LCD drives isoboles, as shown in Figure 8, when the grid of individual unit pixel is opened, data-signal is by thin film transistor (TFT) (Thin Film Transistor, abbreviation TFT) raceway groove passes on the pixel electrode, and then the liquid crystal deflecting element in this pixel voltage control liquid crystal cell, reach the purpose of control light, the memory capacitance (Cst) that rely on pixel electrode and pixel common electrode signal line to form this moment in a vertical interval keeps this pixel voltage, just keeps this voltage by the mode (Cst on Common) that forms memory capacitance on pixel common electrode signal line.In TFT LCD driving process, when grid is opened in proper order, data-signal is incorporated into pixel inside, promptly work as the capable grid of n and apply high-voltage signal (Vgh), when pixel is opened, other each row pixel gates all apply low-voltage signal (Vgl), turn-off to keep TFT, keep on the pixel by Cst stored voltage value.

Fig. 9 is a prior art TFT LCD design Cst on Common design isoboles, the design of the Cst on common of prior art, pixel commonelectrode signal line 4 directly links to each other with the outside commonelectrode signal line 3 of screen periphery, therefore in working order down, no matter whether this pixel is opened, and the contact conductor of Cst all applies the voltage identical with public electrode.Afterpixel electrode 5 chargings, voltage on the pixel (data) remain to always next frame when this pixel is charged again till, this pixel is keeping picture data always, when the next frame picture changed, picture data refreshed on original picture basis, promptly after the capable driving of n, before the capable pixel of n+1 will be opened, because the capable pixel of n+1 is not in time removed original display message, causes persistence of vision, forms the conditions of streaking of moving image.

Therefore the display effect of the drive unit of existing Thin Film Transistor-LCD is to revise picture on the basis of existing gray scale, can cause persistence of vision, form the phenomenon of motion blur, this phenomenon also can cause the slack-off sensation of response speed, has influenced the quality of picture.

Summary of the invention

The objective of the invention is defective, a kind of drive unit of Thin Film Transistor-LCD is provided, can effectively reduce the phenomenon of the motion image blurring that the persistence of vision of motion picture produces at the drive unit of existing Thin Film Transistor-LCD.

For achieving the above object, the invention provides a kind of drive unit of Thin Film Transistor-LCD, comprising: outside common electrode signal line is used to provide constant voltage; Several pixel common electrode signal lines are used to keep constant voltage; Several signal lines are used to provide signal; Several data signal lines intersect with described several signal lines and to arrange, and are used to provide data-signal; Several pixel electrodes, each pixel electrode is connected with the drain electrode of thin film transistor (TFT) between adjacent signal line and adjacent data signal line, and described pixel electrode and described pixel common electrode signal line overlaid form memory capacitance; Several the first film transistors, the transistorized grid of described the first film is connected with first end of source electrode with the signal line of lastrow, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession; Several second thin film transistor (TFT)s, the grid of described second thin film transistor (TFT) is connected with first end of signal line, and source electrode is connected with outside common electrode signal line, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession.

The drive unit of above-mentioned Thin Film Transistor-LCD, also comprise: several the 3rd thin film transistor (TFT)s, the grid of described the 3rd thin film transistor (TFT) is connected with second end of signal line, source electrode is connected with outside common electrode signal line, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

Also comprise: several the 4th thin film transistor (TFT)s, the grid of described the 4th thin film transistor (TFT) is connected with second end of source electrode with the signal line of lastrow, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

A kind of drive unit of Thin Film Transistor-LCD comprises: outside common electrode signal line is used to provide constant voltage; Several pixel common electrode signal lines are used to keep constant voltage; Several signal lines are used to provide signal; Several data signal lines intersect with described several signal lines and to arrange, and are used to provide data-signal; Several pixel electrodes, each pixel electrode is connected with the drain electrode of thin film transistor (TFT) between adjacent signal line and adjacent data signal line, and described pixel electrode and described pixel common electrode signal line overlaid form memory capacitance; Several the first film transistors, the transistorized grid of described the first film is connected with first end of source electrode with the signal line of lastrow, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession; Several the 3rd thin film transistor (TFT)s, the grid of described the 3rd thin film transistor (TFT) is connected with second end of signal line, and source electrode is connected with outside common electrode signal line, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

A kind of drive unit of Thin Film Transistor-LCD comprises: outside common electrode signal line is used to provide constant voltage; Several pixel common electrode signal lines are used to keep constant voltage; Several signal lines are used to provide signal; Several data signal lines intersect with described several signal lines and to arrange, and are used to provide data-signal; Several pixel electrodes, each pixel electrode is connected with the drain electrode of thin film transistor (TFT) between adjacent signal line and adjacent data signal line, and described pixel electrode and described pixel common electrode signal line overlaid form memory capacitance; Several second thin film transistor (TFT)s, the grid of described second thin film transistor (TFT) is connected with first end of signal line, and source electrode is connected with outside common electrode signal line, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession; Several the 4th thin film transistor (TFT)s, the grid of described the 4th thin film transistor (TFT) is connected with second end of source electrode with the signal line of lastrow, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

The present invention adopts and forms triode by TFT between signal line and the common electrode signal line and is connected, has promptly inserted high-voltage signal before next line is opened in a frame signal turntable driving process, also just is equivalent to insert under normal white mode and deceives picture; When one-row pixels is worked, before next line is not opened, insert by the pressure that the triode effect of lastrow TFT formation is deceived picture data to next line; When one-row pixels is worked, the triode effect that next line forms by lastrow TFT is deceived next line after the pressure insertion of picture data, when this next line work, after the triode that forms by the TFT between outside common electrode signal line and the pixel common electrode signal line is connected, still can charge normal work.

The present invention forcibly applies high pressure by before opening at TFT LCD pixel next line in advance, inserts the purpose of deceiving picture to reach, thereby effectively reduces the moving image conditions of streaking.

Description of drawings

Fig. 1 is the driving isoboles of drive unit first embodiment of Thin Film Transistor-LCD of the present invention;

Fig. 2 is the driving isoboles of drive unit second embodiment of Thin Film Transistor-LCD of the present invention;

Fig. 3 is the driving isoboles of drive unit the 3rd embodiment of Thin Film Transistor-LCD of the present invention;

Fig. 4 is the driving isoboles of drive unit the 4th embodiment of Thin Film Transistor-LCD of the present invention;

Fig. 5 is the driving isoboles of drive unit the 5th embodiment of Thin Film Transistor-LCD of the present invention;

Fig. 6 is the driving isoboles of drive unit the 6th embodiment of Thin Film Transistor-LCD of the present invention;

Fig. 7 is the driving isoboles of drive unit the 7th embodiment of Thin Film Transistor-LCD of the present invention;

Fig. 8 is that prior art TFT LCD drives isoboles;

Fig. 9 is a prior art TFT LCD design Cst on Common design isoboles.

Description of reference numerals:

The outside common electrode signal line of 1-signal line 2-data signal line 3-

4-pixel common electrode signal line 5-pixel electrode 11-the first film transistor

The 12-second thin film transistor (TFT) 13-the 3rd thin film transistor (TFT) 14-the 4th thin film transistor (TFT)

Embodiment

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

In the following embodiments, indication first end is the end near gate drivers, and second end is the end away from gate drivers.

Embodiment one

Fig. 1 is the driving isoboles of the drive unit embodiment one of Thin Film Transistor-LCD of the present invention, and as shown in Figure 1, the drive unit of this Thin Film Transistor-LCD comprises outside public electrodewire size line 3, is used to provide constant voltage; Several pixel commonelectrode signal lines 4 are used to keep constant voltage;Several signal lines 1 are used to provide signal; Severaldata signal lines 2 intersect with several signal lines and to arrange, and are used to provide data-signal;Several pixel electrodes 5, eachpixel electrode 5 is connected with the drain electrode of thin film transistor (TFT) betweenadjacent signal line 1 and adjacentdata signal line 2, andpixel electrode 5 forms memory capacitance with pixel commonelectrode signal line 4 overlaids; Several thefirst film transistors 11, the grid of each thefirst film transistor 11 is connected withsignal line 1 first end of lastrow with source electrode, and drain electrode is connected with pixel commonelectrode signal line 4 first ends; Several second thin film transistor (TFT)s 12, the grid of each second thin film transistor (TFT) 12 is connected withsignal line 1 first end, and source electrode is connected with outside commonelectrode signal line 3, and drain electrode is connected with pixel commonelectrode signal line 4 first ends.

With n-1, n, n+1 behavior example describes, when the capable unlatching of n, when justsignal line 1 applies high-voltage signal (Vgh), thepixel electrode 5 that n is capable is introduced the data-signal thatdata signal line 2 transmits, because other each row all are in low voltage signal (Vgl) control, therefore the capable thefirst film transistor 11 of n ends, and 12 work of second thin film transistor (TFT), therefore the pixel commonelectrode signal line 4 of the memory capacitance (Cst) that n is capable still applies common electric voltage by second thin film transistor (TFT) 12 by outsidepublic electrode 3, n is capable can to carry out normal charging process, the capable pixel work of n, at this moment, thefirst film transistor 11 work conductings that n+1 is capable, promptly the pixel commonelectrode signal line 4 of the capable memory capacitance of n+1 (Cst) is applied in high-voltage signal (Vgh) equally, that is to say when the capable work of n, n+1 is capable to open before, by n capable (lastrow) the pixel commonelectrode signal line 4 of the memory capacitance (Cst) of n+1 capable (next line) has been applied high pressure in advance, therefore before the capable pixel work of n+1, black picture can be formed, the motion blur phenomenon can be reduced thus.

Type of drive by the data of black plug line by line of the present invention drives the LCD display module, can be before the one-row pixels picture refreshing, carry out picture " zero clearing " earlier, just from the gray image to the black image, reset, can eliminate the conditions of streaking that original picture causes persistence of vision that will display frame like this.

Embodiment two

Fig. 2 is the driving isoboles of the drive unit embodiment two of Thin Film Transistor-LCD of the present invention, as shown in Figure 2, be different from embodiment one, further, the drive unit of Thin Film Transistor-LCD of the present invention also comprises: several the 3rd thin film transistor (TFT)s 13, the grid of each the 3rd thin film transistor (TFT) 13 is connected withsignal line 1 second end, and source electrode is connected with outside commonelectrode signal line 3, and drain electrode is connected with pixel commonelectrode signal line 4 second ends.

With n-1, n, n+1 behavior example describes, when the capable unlatching of n, when justsignal line 1 applies high-voltage signal (Vgh), thepixel electrode 5 that n is capable is introduced the data-signal thatdata signal line 2 transmits, because other each row all are in low voltage signal (Vgl) control, therefore the capable thefirst film transistor 11 of n ends, and second thin film transistor (TFT) 12 and 13 work of the 3rd thin film transistor (TFT), therefore the pixel commonelectrode signal line 4 of the memory capacitance (Cst) that n is capable is by second thin film transistor (TFT) 12, the 3rd thin film transistor (TFT) 13 applies common electric voltage by outsidepublic electrode 3, n is capable can to carry out normal charging process, the capable pixel work of n, at this moment, thefirst film transistor 11 work conductings that n+1 is capable, promptly the pixel commonelectrode signal line 4 of the capable memory capacitance of n+1 (Cst) is applied in high-voltage signal (Vgh) equally, that is to say when the capable work of n, n+1 is capable to open before, by n capable (lastrow) the pixel commonelectrode signal line 4 of the memory capacitance (Cst) of n+1 capable (next line) has been applied high pressure in advance, therefore before the capable pixel work of n+1, black picture can be formed, the motion blur phenomenon can be reduced thus.

The type of drive of the data of black plug line by line of the present invention drives the LCD display module, can be before the one-row pixels picture refreshing, carry out picture " zero clearing " earlier, just from the gray image to the black image, reset, can eliminate the conditions of streaking that original picture causes persistence of vision that will display frame like this.

Embodiment three

Fig. 3 is the driving isoboles of the drive unit embodiment three of Thin Film Transistor-LCD of the present invention, as shown in Figure 3, be different from embodiment one, further, the drive unit of Thin Film Transistor-LCD of the present invention also comprises: several the 4th thin film transistor (TFT)s 14, the grid of each the 4th thin film transistor (TFT) 14 is connected withsignal line 1 second end of lastrow with source electrode, and drain electrode is connected with pixel commonelectrode signal line 4 second ends.

With n-1, n, n+1 behavior example describes, when the capable unlatching of n, when justsignal line 1 applies high-voltage signal (Vgh), thepixel electrode 5 that n is capable is introduced the data-signal thatdata signal line 2 transmits, because other each row all are in low voltage signal (Vgl) control, therefore capable thefirst film transistor 11 and the 4th thin film transistor (TFT) 14 of n ends, and 12 work of second thin film transistor (TFT), therefore the pixel commonelectrode signal line 4 of the memory capacitance (Cst) that n is capable applies common electric voltage by second thin film transistor (TFT) 12 by outsidepublic electrode 3, n is capable can to carry out normal charging process, the capable pixel work of n, at this moment, thefirst film transistor 11 that n+1 is capable and the 14 work conductings of the 4th thin film transistor (TFT), promptly the pixel commonelectrode signal line 4 of the capable memory capacitance of n+1 (Cst) is applied in high-voltage signal (Vgh) equally, that is to say when the capable work of n, n+1 is capable to open before, by n capable (lastrow) the pixel commonelectrode signal line 4 of the memory capacitance (Cst) of n+1 capable (next line) has been applied high pressure in advance, therefore before the capable pixel work of n+1, black picture can be formed, the motion blur phenomenon can be reduced thus.

The type of drive of the data of black plug line by line of the present invention drives the LCD display module, can be before the one-row pixels picture refreshing, carry out picture " zero clearing " earlier, just from the gray image to the black image, reset, can eliminate the conditions of streaking that original picture causes persistence of vision that will display frame like this.

Embodiment four

Fig. 4 is the driving isoboles of the drive unit embodiment four of Thin Film Transistor-LCD of the present invention, as shown in Figure 4, be different from embodiment one, further, the drive unit of Thin Film Transistor-LCD of the present invention also comprises: several the 3rd thin film transistor (TFT)s 13, the grid of each the 3rd thin film transistor (TFT) 13 is connected withsignal line 1 second end, and source electrode is connected with outside commonelectrode signal line 3, and drain electrode is connected with pixel commonelectrode signal line 4 second ends; Several the 4th thin film transistor (TFT)s 14, the grid of each the 4th thin film transistor (TFT) 14 is connected withsignal line 1 second end of lastrow with source electrode, and drain electrode is connected with pixel commonelectrode signal line 4 second ends.

With n-1, n, n+1 behavior example describes, when the capable unlatching of n, when justsignal line 1 applies high-voltage signal (Vgh), thepixel electrode 5 that n is capable is introduced the data-signal thatdata signal line 2 transmits, because other each row all are in low voltage signal (Vgl) control, therefore capable thefirst film transistor 11 and the 4th thin film transistor (TFT) 14 of n ends, and second thin film transistor (TFT) 12 and 13 work of the 3rd thin film transistor (TFT), therefore the pixel commonelectrode signal line 4 of the memory capacitance (Cst) that n is capable is still by second thin film transistor (TFT) 12, the 3rd thin film transistor (TFT) 13 applies common electric voltage by outsidepublic electrode 3, n is capable can to carry out normal charging process, the capable pixel work of n, at this moment, thefirst film transistor 11 that n+1 is capable and the 14 work conductings of the 4th thin film transistor (TFT), promptly the pixel commonelectrode signal line 4 of the capable memory capacitance of n+1 (Cst) is applied in high-voltage signal (Vgh) equally, that is to say when the capable work of n, n+1 is capable to open before, by n capable (lastrow) the pixel commonelectrode signal line 4 of the memory capacitance (Cst) of n+1 capable (next line) has been applied high pressure in advance, therefore before the capable pixel work of n+1, black picture can be formed, the motion blur phenomenon can be reduced thus.

The type of drive of crossing the data of black plug line by line of the present invention drives the LCD display module, can be before the one-row pixels picture refreshing, carry out picture " zero clearing " earlier, just from the gray image to the black image, reset, can eliminate the conditions of streaking that original picture causes persistence of vision that will display frame like this.

Embodiment five

Fig. 5 is the driving isoboles of the drive unit embodiment five of Thin Film Transistor-LCD of the present invention, and as shown in Figure 5, the drive unit of this Thin Film Transistor-LCD comprises outside public electrodewire size line 3, is used to provide constant voltage; Several pixel commonelectrode signal lines 4 are used to keep constant voltage;Several signal lines 1 are used to provide signal; Severaldata signal lines 2 intersect with several signal lines and to arrange, and are used to provide data-signal;Several pixel electrodes 5, eachpixel electrode 5 is connected with the drain electrode of thin film transistor (TFT) betweenadjacent signal line 1 and adjacentdata signal line 2, andpixel electrode 5 forms memory capacitance with pixel commonelectrode signal line 4 overlaids; Several thefirst film transistors 11, the grid of each thefirst film transistor 11 is connected withsignal line 1 first end of lastrow with source electrode, and drain electrode is connected with pixel commonelectrode signal line 4 first ends; Several the 3rd thin film transistor (TFT)s 13, the grid of each the 3rd thin film transistor (TFT) 13 is connected withsignal line 1 second end, and source electrode is connected with outside commonelectrode signal line 3, and drain electrode is connected with pixel commonelectrode signal line 4 second ends.

With n-1, n, n+1 behavior example describes, when the capable unlatching of n, thefirst film transistor 11 that n is capable ends, and 13 work of the 3rd thin film transistor (TFT), therefore the pixel commonelectrode signal line 4 of the memory capacitance (Cst) that n is capable applies common electric voltage by the 3rd thin film transistor (TFT) 13 by outsidepublic electrode 3, n is capable can to carry out normal charging process, the capable pixel work of n, at this moment, thefirst film transistor 11 work conductings that n+1 is capable, promptly the pixel commonelectrode signal line 4 of the capable memory capacitance of n+1 (Cst) is applied in high-voltage signal (Vgh) equally, that is to say when the capable work of n, n+1 is capable to open before, by n capable (lastrow) the pixel commonelectrode signal line 4 of the memory capacitance (Cst) of n+1 capable (next line) has been applied high pressure in advance, therefore before the capable pixel work of n+1, black picture can be formed, the motion blur phenomenon can be reduced thus.

Embodiment six

Fig. 6 is the driving isoboles of the drive unit embodiment six of Thin Film Transistor-LCD of the present invention, and as shown in Figure 6, the drive unit of this Thin Film Transistor-LCD comprises outside public electrodewire size line 3, is used to provide constant voltage; Several pixel commonelectrode signal lines 4 are used to keep constant voltage;Several signal lines 1 are used to provide signal; Severaldata signal lines 2 intersect with several signal lines and to arrange, and are used to provide data-signal;Several pixel electrodes 5, eachpixel electrode 5 is connected with the drain electrode of thin film transistor (TFT) betweenadjacent signal line 1 and adjacentdata signal line 2, andpixel electrode 5 forms memory capacitance with pixel commonelectrode signal line 4 overlaids; Several second thin film transistor (TFT)s 12, the grid of each second thin film transistor (TFT) 12 is connected withsignal line 1 first end, and source electrode is connected with outside commonelectrode signal line 3, and drain electrode is connected with pixel commonelectrode signal line 4 first ends; Several the 4th thin film transistor (TFT)s 14, the grid of each the 4th thin film transistor (TFT) 14 is connected withsignal line 1 second end of lastrow with source electrode, and drain electrode is connected with pixel commonelectrode signal line 4 second ends.

With n-1, n, n+1 behavior example describes, when the capable unlatching of n, the 4th thin film transistor (TFT) 14 that n is capable ends, and 12 work of second thin film transistor (TFT), therefore the pixel commonelectrode signal line 4 of the memory capacitance (Cst) that n is capable applies common electric voltage by second thin film transistor (TFT) 12 by outsidepublic electrode 3, n is capable can to carry out normal charging process, the capable pixel work of n, at this moment, the 4th thin film transistor (TFT) 14 work conductings that n+1 is capable, promptly the pixel commonelectrode signal line 4 of the capable memory capacitance of n+1 (Cst) is applied in high-voltage signal (Vgh) equally, that is to say when the capable work of n, n+1 is capable to open before, by n capable (lastrow) the pixel commonelectrode signal line 4 of the memory capacitance (Cst) of n+1 capable (next line) has been applied high pressure in advance, therefore before the capable pixel work of n+1, black picture can be formed, the motion blur phenomenon can be reduced thus.

Embodiment seven

Fig. 7 is the driving isoboles of the drive unit embodiment seven of Thin Film Transistor-LCD of the present invention, as shown in Figure 7, be different from embodiment four, present embodiment only adopts the 3rd thin film transistor (TFT) 13 and the 4th thin film transistor (TFT) 14, and do not adopt thefirst film transistor 11 and second thin film transistor (TFT) 12, can be implemented in equally before the one-row pixels picture refreshing, carry out picture " zero clearing " earlier, just from the gray image to the black image, reset, eliminate the conditions of streaking that original picture causes persistence of vision that will display frame.But because the 3rd thin film transistor (TFT) 13 and the 4th thin film transistor (TFT) 14 are away from gate drivers, pixel commonelectrode signal line 4 lead-in wires are because the increase of wiring distance can cause signal delay, therefore, though the technical scheme of present embodiment can be worked, may cause phenomenon of picture flicker.

It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (5)

1. the drive unit of a Thin Film Transistor-LCD is characterized in that comprising:

Outside common electrode signal line is used to provide constant voltage;

Several pixel common electrode signal lines are used to keep constant voltage;

Several signal lines are used to provide signal;

Several data signal lines intersect with described several signal lines and to arrange, and are used to provide data-signal;

Several pixel electrodes, each pixel electrode is connected with the drain electrode of thin film transistor (TFT) between adjacent signal line and adjacent data signal line, and described pixel electrode and described pixel common electrode signal line overlaid form memory capacitance;

Several the first film transistors, the transistorized grid of described the first film is connected with first end of source electrode with the signal line of lastrow, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession;

Several second thin film transistor (TFT)s, the grid of described second thin film transistor (TFT) is connected with first end of signal line, and source electrode is connected with outside common electrode signal line, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession.

2. the drive unit of Thin Film Transistor-LCD according to claim 1, it is characterized in that also comprising: several the 3rd thin film transistor (TFT)s, the grid of described the 3rd thin film transistor (TFT) is connected with second end of signal line, source electrode is connected with outside common electrode signal line, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

3. the drive unit of Thin Film Transistor-LCD according to claim 1 and 2, it is characterized in that also comprising: several the 4th thin film transistor (TFT)s, the grid of described the 4th thin film transistor (TFT) is connected with second end of source electrode with the signal line of lastrow, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

4. the drive unit of a Thin Film Transistor-LCD is characterized in that comprising:

Outside common electrode signal line is used to provide constant voltage;

Several pixel common electrode signal lines are used to keep constant voltage;

Several signal lines are used to provide signal;

Several data signal lines intersect with described several signal lines and to arrange, and are used to provide data-signal;

Several pixel electrodes, each pixel electrode is connected with the drain electrode of thin film transistor (TFT) between adjacent signal line and adjacent data signal line, and described pixel electrode and described pixel common electrode signal line overlaid form memory capacitance;

Several the first film transistors, the transistorized grid of described the first film is connected with first end of source electrode with the signal line of lastrow, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession;

Several the 3rd thin film transistor (TFT)s, the grid of described the 3rd thin film transistor (TFT) is connected with second end of signal line, and source electrode is connected with outside common electrode signal line, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

5. the drive unit of a Thin Film Transistor-LCD is characterized in that comprising:

Outside common electrode signal line is used to provide constant voltage;

Several pixel common electrode signal lines are used to keep constant voltage;

Several signal lines are used to provide signal;

Several data signal lines intersect with described several signal lines and to arrange, and are used to provide data-signal;

Several pixel electrodes, each pixel electrode is connected with the drain electrode of thin film transistor (TFT) between adjacent signal line and adjacent data signal line, and described pixel electrode and described pixel common electrode signal line overlaid form memory capacitance;

Several second thin film transistor (TFT)s, the grid of described second thin film transistor (TFT) is connected with first end of signal line, and source electrode is connected with outside common electrode signal line, and drain electrode is connected with first end of the pixel common electrode signal line of one's own profession;

Several the 4th thin film transistor (TFT)s, the grid of described the 4th thin film transistor (TFT) is connected with second end of source electrode with the signal line of lastrow, and drain electrode is connected with second end of the pixel common electrode signal line of one's own profession.

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