CN101221337A - Array substrate of LCD device and its driving method - Google Patents

The invention relates to a liquid crystal display array substrate, comprising an underlayer substrate, a plurality of liquid crystal pixel electrodes, data lines and scanning lines, wherein each liquid crystal pixel electrode is composed of four sub-pixel electrodes, and the sub-pixel electrodes in the same column are connected to the same data line. Each data line is connected with two columns of sub-pixel electrodes; the pixel electrodes in the same row are respectively and alternatively connected with two scanning lines, with each two as a group. The sub-pixel electrodes connected with each scanning line are in the same row; two sub-pixel electrodes in the same line between two adjacent data lines are connected with the same scanning line and are respectively connected with the two data lines as well. The invention also relates to a method for driving the same liquid crystal display array substrate. The invention adopts a means that the sub-pixel electrodes in the same row are driven by double scanning lines, and two columns use one data line, which reduces data lines needed, used data drive chips and total cost of the liquid crystal display.

Technical field

The present invention relates to a kind of LCD device array substrates and driving method, relate in particular to a kind of R of comprising, G, B, the array base palte of the thin-film transistor LCD device of four sub-pixels of W reach the driving circuit on this array base palte are carried out method of driving.

Background technology

When array base palte was worked, data line was used for the video data signal of data driving chip (IC) is sent to the drain electrode of TFT on-off element, controls the voltage of liquid crystal pixel electrodes with this; Sweep trace is used for the scanning drive signal of scanner driver is sent to the grid of TFT on-off element, controls closing and opening of TFT on-off element with this.When liquid crystal indicator was worked, for a frame picture, data driving chip was transferred to drain electrode with video data signal by data line, and scanner driver is line by line to sweep trace input scan drive signal.When scanning drive signal is high level, can pass through gate turn-on source electrode and drain electrode, video data signal is transferred to liquid crystal pixel electrodes.Because be connected with common electric voltage in the public electrode that is oppositely arranged with liquid crystal pixel electrodes, so between liquid crystal pixel electrodes and public electrode, can produce certain voltage.The change of this voltage swing can further change the transmitted light intensity size of the liquid crystal that is arranged between liquid crystal pixel electrodes and the public electrode, thereby realizes that image shows.In liquid crystal indicator, each liquid crystal pixel electrodes i.e. a liquid crystal display, again as shown in Figure 1, usually be divided into red, green, blue three pixel electrodes, the color film of corresponding color is set in the above, as red (R), green (G), blue (B) three primary colours, connect the voltage of controlling on three pixel electrodes of red, green, blue respectively by three data lines, promptly can realize colored the demonstration.

But the subject matter that exists in the above-mentioned technology is: the first, for TFT-LCD, the chip for driving of control Driver Circuit comprises scanning drive chip and data driver, all be absolutely necessary, and the cost of chip for driving occupies significant proportion in the TFT-LCD production cost, and data driving chip makes that the whole cost of existing TFT-LCD product is higher because its complicated texture ratio scanner driver is more expensive; The second, since R, G, the application of the color film of B has reduced the light transmission rate of LCD, so will reach the backlight that higher display brightness just needs high brightness, this will cause cost up, a series of problems such as power consumption increase.

For addressing the above problem, a kind of technical scheme that prior art proposes is: increase a white (W) sub-pixel in liquid crystal pixel electrodes, that is to say a pixel electrode is divided into red (R), green (G), blue (B), (W) four pixel electrodes because the light transmission rate of white sub-pixels is higher, thereby have increased the light transmission rate of whole pixel in vain.But the defective of this technical scheme is because the increase of white sub-pixels needs the corresponding data line that increases.The increase that this will cause total data line quantity further causes the increase of data driver cost.

Summary of the invention

The purpose of this invention is to provide a kind of LCD device array substrates and driving method,, reduce required data driving chip, thereby reduce the total cost of liquid crystal indicator to reduce the quantity of data line on the array base palte.

For achieving the above object, the invention provides a kind of LCD device array substrates, comprise underlay substrate, and be arranged on liquid crystal pixel electrodes, data line and sweep trace on the underlay substrate, this liquid crystal pixel electrodes is made of four pixel electrodes, wherein:

Each pixel electrode of same column is connected on same the data line, and every data line connects the two row pixel electrodes that are positioned at these data line both sides;

Colleague's pixel electrode in twos one group alternately be connected on two sweep traces that are positioned at these row pixel electrode both sides, and the pixel electrode that every sweep trace connects is positioned at same delegation;

Article two, between the adjacent data line, two colleagues and adjacent pixel electrode be connected on same the sweep trace, and be connected on two data lines.

For achieving the above object, the present invention also provides a kind of LCD device array substrates driving method, comprises the steps:

Pixel electrode receives the video data signal of data line input;

By sweep trace input scan drive signal, with behavior unit driven element pixel electrode, and when driving every capable pixel electrode, drive one group of pixel electrode that alternately is connected on two sweep traces that are positioned at these row pixel electrode both sides in twos in proper order by two sweep traces, the signal polarity counter-rotating of adjacent described data line.

By above technical scheme as can be known, the present invention uses R, G, B, the LCD device array substrates of four sub-pixels of W and driving method use dual scanning line to drive by adopting colleague's pixel electrode, thereby can make the technological means of the shared data line of two row pixel electrodes, it is many to have overcome in the prior art data line quantity, the problem that desired data chip for driving quantity is big can reduce the use amount of data line and data driving chip, reduces the whole cost of liquid crystal indicator.

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

Description of drawings

Fig. 1 is the structural representation of a kind of LCD device array substrates of prior art;

Fig. 2 is the structural representation of LCD device array substrates embodiment one of the present invention;

Fig. 3 is the structural representation of LCD device array substrates embodiment two of the present invention;

Fig. 4 is the process flow diagram of LCD device array substrates driving method embodiment one of the present invention;

Fig. 5 is the process flow diagram of LCD device array substrates driving method embodiment two of the present invention;

Fig. 6 is the distribution schematic diagram of pixel electrode voltage positive-negative polarity state on the array base palte among the LCD device array substrates driving method embodiment two of the present invention.

Embodiment

In the present embodiment, colleague's pixel electrode can per two one a group shared data line, and two pixel electrodes of shared data line are connected on upper and lower two sweep traces, control its switch by upper and lower two sweep trace timesharing alternate sweeps.The data line of present embodiment LCD device array substrates links to each other with data driving chip respectively, sweep trace links to each other with scanner driver respectively, when its work, the example that is shown as with a frame picture, at first import the video data signal of present frame by data line, the scanning drive signal of while article one sweep trace input high level, make and be connected on article one sweep trace, sequence number is " 1 ", " 2 ", " 5 ", " 6 ", " 9 ", " 10 " ... the pixel electrode conducting, promptly every two of two conductings, next constantly, when article one sweep trace finishes the high level input, scanning drive signal at second sweep trace input high level, then be connected on the second sweep trace, sequence number is " 3 ", " 4 ", " 7 ", " 8; " 11 "; " 12 " ... the pixel electrode conducting; then the first row pixel electrode is by inputting video data signal respectively, and because keeps the existence of electric capacity can maintain the voltage of current input.Repeat above-mentioned steps, pixel electrode is lighted line by line in proper order with behavior unit, is perhaps lighted according to a definite sequence.

The technical scheme of present embodiment, a moment, the video data signal in data line only is transferred to the pixel electrode of a unlatching, and the not conducting as yet of other coupled pixel electrode, video data signal does not influence it.So this embodiment can normally realize the demonstration of image, and, can reduce the quantity of data line, thereby reduce required data driving chip because of shared data line,

With one of the display resolution major criterion of liquid crystal indicator VGA (Video GraphicsArray) 640*480 resolution is example, the array base palte of the R of prior art, G, B display mode, need 640*3=1920 bar data line, article 480, sweep trace, total cabling quantity is 1920+480=2400.In order to increase light transmission rate, prior art has increased white pixel, adopt R, G, B, W display mode, the array base palte of this display mode, under the situation of same VGA640*480 resolution, pixel electrode adopts the arrangement mode of two row, two row, then needs 640*2=1280 bar data line, 480*2=960 bar sweep trace, total cabling quantity is 1280+960=2240.And LCD device array substrates of the present invention when pixel electrode adopts the arrangement mode of two row, two row, needs 640*2/2=640 bar data line, 480*2*2=1920 bar sweep trace, and total cabling quantity is 640+1920=2560; The present invention program has been owing to significantly reduced the quantity of data line, though total cabling quantity increase to some extent, owing to the cost of data driver exceeds the cost of scanner driver far away, so the present invention can reduce the whole cost of liquid crystal indicator.

The present embodiment LCD device array substrates is when work, and the video data signal of data line input can frequently reverse.Can be at first control its sweep trace that links to each other and drive line by line by first scanner driver, when each scanning line driving that first scanner driver is connected is finished, the video data signal counter-rotating, then second scanner driver is controlled its sweep trace that links to each other and is driven line by line.In a frame picture, the polarity of voltage that is connected a liquid crystal display pixel electrode on the data line is constant like this, but because the pixel electrode of adjacent lines does not link to each other with same scanner driver, so the polarity of voltage of the pixel electrode of adjacent lines is opposite.In whole image, bright slightly or dark slightly liquid crystal display makes the display effect homogenising of whole image separately, has avoided phenomenon generations such as flicker, and the video data signal that needn't frequently reverse simultaneously also can reduce the required energy consumption of demonstration.

With one of the display resolution major criterion of liquid crystal indicator VGA640*480 resolution is example, the array base palte of the R of prior art, G, B display mode, need 640*3=1920 bar data line, 480 sweep traces, total cabling quantity is 1920+480=2400.In order to increase light transmission rate, prior art has increased white pixel, adopt R, G, B, W display mode, the array base palte of this display mode, under the situation of same VGA640*480 resolution, pixel electrode adopts the arrangement mode of four row delegation, then needs 640*4=2560 bar data line, article 480, sweep trace, total cabling quantity is 2560+480=3040.And LCD device array substrates of the present invention when pixel electrode adopts the arrangement mode of four row delegation, needs 640*4/2=1280 bar data line, 480*2=960 bar sweep trace, and total cabling quantity is 1280+960=2240.Compared with prior art, data line quantity reduces half, and total cabling quantity also reduces a lot, has reduced whole cost; The aperture opening ratio of liquid crystal indicator of the present invention increases simultaneously, can access higher brightness.

LCD device array substrates of the present invention has adopted the technological means that increases sweep trace to reduce data line, thereby has reached the minimizing data driving chip, reduces the purpose of cost of products; And adopted the scheme that two scanner driver interlacing driven element pixel electrodes are set to avoid frequent counter-rotating video data signal, show required energy consumption thereby reduced, alleviated the influence of the KickBack voltage that stray capacitance brings simultaneously, whole image brightness visually is with homogenized, avoid occurring phenomenons such as flicker, improved display effect.

Be illustrated in figure 4 as the process flow diagram of LCD device array substrates driving method embodiment one of the present invention, this method comprises the steps:

Step 1, data driving chip by data line to pixel electrode inputting video data signal;

Present embodiment can be used for driving the technical scheme of the arbitrary embodiment of LCD array substrate of the present invention, colleague's pixel electrode is in twos on one group of two sweep trace that are connected both sides at interval, so when driving delegation's pixel electrode, will be at first to sweep trace input scan drive signal wherein, drive this row in twos at interval pixel electrode light, then, drive the remaining pixel electrode of this row and light to another sweep trace input scan drive signal.

The technical scheme of present embodiment can guarantee the normal demonstration of liquid crystal indicator, is putting before this, colleague's pixel electrode can a shared in twos data line, can reduce the quantity of desired data line, thereby can reduce required data driving chip, reduce the cost of product.

Wherein, when driving every capable pixel electrode, by two sweep traces, order drives one group of pixel electrode that alternately is connected on these two sweep traces that are positioned at these row pixel electrode both sides in twos.

Present embodiment can be used for driving the technical scheme of LCD array substrate embodiment two of the present invention, for example, at first light by the pixel electrode of odd-numbered lines such as first scanner driver driving first and third, five, nonreversible video data signal in this process, when first scanner driver drive finish all coupled pixel electrodes capable after, the counter-rotating video data signal is lighted by the pixel electrode of even number lines such as second scanner driver driving second, four, six.This technical scheme can realize that the pixel electrode of adjacent lines is opposite with polarity of voltage between the public electrode, thereby the bright slightly and dark slightly pixel electrode that stray capacitance is caused can be provided with at interval, makes the display effect homogenising, improves display quality.Simultaneously, can reduce the counter-rotating number of times of video data signal, save the energy consumption of product.

On the basis of present embodiment, the video data signal counter-rotating of adjacent data line input can further be set, then adjacent column and polarity of voltage that be connected the pixel electrode on the different pieces of information line also is opposite, further make the display effect homogenising, improved display quality, adopt the technical scheme of present embodiment, the positive and negative polarity of voltage distribution of each pixel electrode on the array base palte as shown in Figure 6.

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.