TWI416493B - Liquid crystal display - Google Patents

Abstract

The present disclose relates a liquid crystal display. The liquid crystal display includes a liquid crystal panel and a data drive circuit. For a same gray scale, the data drive circuit outputs a plurality of first gray scale voltages configuring to drive the pixels of non-polarity inverting lines, and outputs a plurality of second gray scale voltages configuring to drive the pixels of polarity inverting lines. Each second gray scale voltage includes a first sub-gray scale voltage and a second sub-gray scale voltage. The first sub-gray scale voltage and the second sub-gray scale voltage are output sequentially in order to drive the same pixel of the polarity inverting lines. An absolute value of the first sub-gray scale voltage is bigger than an absolute value of the second sub-gray scale voltage, and the absolute value of the second sub-gray scale voltage is identical with An absolute value of each first sub-gray scale voltage.

Description

LCD Monitor

The present invention relates to a liquid crystal display.

The liquid crystal molecules of the liquid crystal display have such a characteristic that if the direction of the electric field applied to both ends of the liquid crystal layer remains unchanged for a long time, the characteristics of the liquid crystal molecules are destroyed, that is, they cannot be rotated in response to the change of the electric field to form a different one. Grayscale. Therefore, it is necessary to change the direction of the electric field at regular intervals to invert the liquid crystal molecules, thereby preventing the characteristics of the liquid crystal molecules from being destroyed. To this end, the industry has developed a variety of techniques to achieve the reversal of liquid crystal molecules. Among them, the effect of the multi-column inversion driving method is better.

Now, the two-column inversion driving method of the multi-column inversion driving method is taken as an example, that is, the polarities of the voltages applied to the pixels of the same column in the first column and the second column of the liquid crystal display are the same, and the third column and The polarities of the voltages applied to the pixels in the same column in the fourth column are the same, and the polarities of the voltages applied to the pixels in the same column in the second column and the third column are opposite, and the polarities of the voltages of the other columns are loaded. The same rules as in the first column to the fourth column. The polarity of the voltage applied to each pixel is inverted frame by frame. Wherein, the voltage applied to the pixel of the liquid crystal display is the difference between the gray scale voltage and the common voltage, and the voltage applied to the pixel is positive when the gray scale voltage is greater than the common voltage, and the gray scale voltage is defined as the positive gray. The step voltage; when the gray scale voltage is less than the common voltage, the voltage applied to the pixel is negative, and the gray scale voltage is defined as the negative gray scale voltage.

However, when the same gray scale is displayed, the data line of the liquid crystal display will be lost in the process of transmitting the gray scale voltage, and the farther the gray scale voltage is transmitted, the more the loss is. Therefore, the gray scale voltage is not an ideal square wave signal during the transmission process, that is, the gray scale voltage cannot immediately change from the negative gray scale voltage to the positive gray scale voltage during the actual transmission process, or immediately changes from the positive gray scale voltage. Is the negative gray scale voltage, but gradually changes to the desired polarity Gray scale voltage. Therefore, when the polarity of the voltage applied to the pixel of the i-th column is the same as the polarity of the voltage applied to the pixel of the (i+1)th column, and the polarity of the voltage applied to the pixel of the i-1th column is opposite, then The voltage loaded by the i-th column is less than the voltage loaded by the i+1th column of pixels. Therefore, the image displayed on the liquid crystal display may have a bright line and a dark line, that is, an even line phenomenon, and the parity line phenomenon is more serious for the image of the middle portion and the lower portion of the liquid crystal panel of the liquid crystal display. Where i is a natural number, and 2≦i≦L, L is the total number of pixels of the liquid crystal display, and is also a natural number.

In view of the above, it is necessary to provide a liquid crystal display capable of improving the phenomenon of the odd-even line when displaying an image.

A liquid crystal display includes a liquid crystal panel and a data and driving circuit. The liquid crystal panel includes a plurality of pixels. For the same gray level, the data driving circuit outputs a complex first gray scale voltage to drive the pixels of the polarity inversion reverse column, and outputs a plurality of second gray scale voltages to drive the pixels of the polarity inversion column. Each of the second gray scale voltages includes a first sub-gray voltage and a second sub-gray voltage, and the first sub-gray voltage and the second sub-gray voltage are continuously output to drive the polarity Reverse the same pixel in the column. The absolute value of the first sub-gray voltages is greater than the absolute values of the second sub-gray voltages, and the absolute values of the second sub-gray voltages are equal to the absolute values of the first gray-scale voltages.

A liquid crystal display includes a liquid crystal panel and a data driving circuit. The liquid crystal panel includes at least two display areas. Each of the display areas includes at least one column of pixels. For the same gray level, the data driving circuit outputs a complex first gray scale voltage to drive the pixels of the polarity inversion reverse column, and outputs a complex second gray scale voltage to drive the pixels of the polarity inversion column to be overvoltage driven. And for the same display area, the second gray scale voltages are driven to the same extent by the polarity inversion column pixels, and for the different display areas, the second gray scale voltages are overdriven by the polarity inversion column pixels. Degree with the display area and the data drive The distance between the roads increases as the distance increases.

Compared with the prior art, in the liquid crystal display of the present invention, since the data driving circuit outputs the second gray scale voltage to drive the same pixel of the polarity inversion column, when the second gray scale voltage is the first After the sub-gray voltage is transmitted and attenuated, the gray scale voltage actually applied to the pixel can be substantially the same as the first gray scale voltage. Therefore, when the liquid crystal display displays the same gray scale, the voltage loaded by the pixel of the polarity inversion column substantially coincides with the absolute value of the voltage applied by the pixel of the polarity inversion column, thereby improving the liquid crystal display. The parity line phenomenon that occurs when an image is displayed.

Compared with the prior art, in the liquid crystal display of the present invention, since the data driving circuit outputs a plurality of second gray scale voltages to overvoltage driving the pixels of the polarity inversion column, the liquid crystal display can be improved when the image is displayed. The occurrence of the parity line phenomenon. In addition, since the degree of overdrive of the polarity inversion column pixel of the second gray scale voltage increases as the distance between the display region and the data driving circuit increases, the second gray scale can also be improved. The voltage is attenuating more and more during the transmission process.

Please refer to FIG. 1, which is a schematic diagram of a preferred embodiment of a liquid crystal display of the present invention. The liquid crystal display 2 includes a liquid crystal panel 20, a timing control circuit 21, a scan driving circuit 22, a data driving circuit 23, a common voltage generating circuit 24, a gamma voltage generating circuit 25, and a plurality of columns parallel to each other. G ₁ to G _L (L>1), a plurality of lines parallel to each other and insulated from the multi-column scanning lines G ₁ to G _L by data lines D ₁ to D _M (M>1). The multi-column scan lines G ₁ -G _L and the multi-row data lines D ₁ -D _M divide the liquid crystal panel 20 into a plurality of pixels 205, and each pixel 205 includes a neighboring scan line G _L and the data line a thin film transistor 201 at a D _M intersection, a pixel electrode 202, a common electrode 203 disposed opposite the pixel electrode 202, and liquid crystal molecules sandwiched between the two electrodes 202, 203, the thin film transistor 201 The gate electrode g is connected to the scan line G _L , the source s of the thin film transistor 201 is connected to the data line D _M , and the drain d of the thin film transistor 201 is connected to the pixel electrode 202 , the complex pixel 205 The common electrode 203 is common. The liquid crystal panel 20 is halved in a direction parallel to the data line D _M , and is defined as a first display area 210 , a second display area 220 , and a third display area 230 . The first display area 210 is adjacent to the data driving circuit 23, and the third display area 230 is away from the data driving circuit 23. The second display area 220 is interposed between the first display area 210 and the third display area 230. between.

The common voltage generating circuit 24 is for supplying a common voltage (Vcom) to the common electrode 203. The timing control circuit 21 is configured to receive an image signal and a control signal provided by an external circuit (eg, a video signal processing circuit) 10, and output a control signal to control the scan driving circuit 22, the gamma voltage generating circuit 25, and the The data driving circuit 23 operates and transmits a corresponding video signal to the data driving circuit 23. The gamma voltage generating circuit 25 is for outputting a complex gamma voltage to the data driving circuit 23. The scan voltage outputted by the scan driving circuit 22 is loaded on the gate g of the corresponding thin film transistor 201 by the multi-row scan line GL, and the corresponding thin film transistor 201 is turned on. The data driving circuit 23 outputs a complex gray scale voltage corresponding to the received video signal and the gamma voltage, and the gray scale voltage is loaded on the source s of the corresponding thin film transistor 201 by the multi-row data line D _M . If the thin film transistor 201 is in an open state at this time, the gray scale voltage can be transmitted to the drain d of the thin film transistor 201 and loaded on the pixel electrode 202. An electric field is generated between the pixel electrode 202 and the common electrode 203 to control the rotation of the liquid crystal molecules, thereby causing the liquid crystal panel 20 to display an image. The gamma voltage outputted by the gamma voltage generating circuit 25 is opposite to the polarity inversion signal of the common voltage, and the gamma voltage greater than the common voltage is defined as a positive gamma voltage, which is smaller than the gamma voltage of the common voltage. Defined as the negative polarity gamma voltage.

In order to protect the liquid crystal molecules from being damaged, the direction of the electric field needs to be periodically changed. For convenience of description, when the gray scale is loaded on the pixel electrode 202 When the voltage is higher than the common voltage of the common electrode 203, the voltage applied to the pixel 205 is defined as positive polarity, and the gray scale voltage applied to the pixel electrode 202 is defined as a positive gray scale voltage; when loaded on the pixel When the gray scale voltage of the electrode 202 is lower than the common voltage of the common electrode 203, the voltage applied to the pixel 205 is defined as a negative polarity, and the gray scale voltage applied to the pixel electrode 202 is defined as a negative gray scale voltage. When the absolute value of the positive polarity voltage is equal to the absolute value of the negative polarity voltage, the pixel 205 displays the same gray scale.

Please refer to FIG. 2 and FIG. 3. FIG. 2 is a schematic diagram showing the polarity of the voltage applied to the pixel 205 of the liquid crystal display 2. Fig. 3 is a timing chart showing the operation of the liquid crystal display 2 corresponding to Fig. 2. For the sake of simplicity, the polarities of the voltages applied to the first row of pixels 205 of the liquid crystal display 2 and the corresponding operational timings are shown in FIG. 2 and FIG. 3, respectively. The liquid crystal display 2 operates in a two-column inversion driving mode, that is, the polarities of the voltages applied to the pixels 205 of the same column in the first column and the second column of the liquid crystal display 2 are the same, and the third column and the fourth column are respectively The polarities of the voltages applied to the pixels 205 of the same column are the same, and the polarities of the voltages applied to the pixels 205 of the same column in the second column and the third column are opposite, and the polarity of the voltages of the other pixels 205 are the same. The rules from column 1 to column 4 are the same. The polarity of the voltage applied to each pixel 205 is inverted frame by frame.

When the polarity of the voltage applied to the pixel 205 of the i-th column is the same as the polarity of the voltage applied to the pixel 205 of the (i+1)th column, and is opposite to the polarity of the voltage applied to the pixel 205 of the i-1th column, then The i-th column is defined as a polarity inversion column. The other columns of the liquid crystal panel 20 except the polarity inversion column are defined as non-polarity inversion columns. Where i is a natural number, and 2≦i≦L, L is the total number of columns of the pixel 205, and is also a natural number. For example, the pixels of the pixel 205 represented by the circle in FIG. 2 are all the polarity inversion columns, and the columns of the pixels 205 represented by the circles are all the polarity inversion columns.

The operation principle of the liquid crystal display 2 displaying the same gray scale image is illustrated by taking the nth frame image as an example. The working principle of the liquid crystal display 2 is the same for any other frame image displaying the same gray scale. The liquid crystal display 2 The operation of displaying the nth frame image of the same gray level is as follows: The common voltage generating circuit 24 first supplies a common voltage to the common electrode 203. The timing control circuit 21 outputs a reduced swing differential signal (RSDS), a horizontal synchronization signal, a polarity inversion signal (POL), and a data update synchronization signal (TP) according to the received image signal and the control signal. The data driving circuit 23 outputs a vertical synchronization signal to the scan driving circuit 22, and outputs the polarity inversion signal, the data update synchronization signal and the voltage control signal to the gamma voltage generating circuit 25.

The polarity inversion signal is a square wave signal with a period change. When the polarity inversion signal is a logic high level (eg, 1), it is defined as a positive polarity, and when the polarity inversion signal is a logic low level ( For example: 0), it is defined as negative polarity. The data update synchronization signal is a sampling signal for sampling the polarity of the polarity inversion signal. The voltage control signal is a non-periodically changing square wave signal. When the voltage control signal is a logic low level (eg, 0), it is defined as a first voltage control signal, and when the voltage control signal is a logic high level (eg, When :1), it is defined as the second voltage control signal.

The scan driving circuit 22 receives the vertical sync signal, and outputs a scan voltage to sequentially open the thin film transistor 201 of the first display area 210. The timing control circuit 21 sequentially outputs the second voltage control signal and the first voltage control signal to the gamma voltage generating circuit 25 for the pixel 205 of the polarity inversion column. The gamma voltage generating circuit 25 is configured to update the polarity of the polarity inversion signal according to the second voltage control signal and the data update signal, and correspondingly output a second gamma voltage having the same polarity as the sampled polarity to the The data driving circuit 23 outputs a plurality of first gamma voltages having the same polarity as the sampled voltage to the data driving circuit 23 according to the first voltage control signal. The data driving circuit 23 updates the polarity of the sampling of the polarity inversion signal by the synchronization signal according to the data, and sequentially receives the complex second gamma voltage and the complex first gamma voltage, and the corresponding output is low. a second gray scale voltage having the same grayscale value and the same polarity as the sampling is applied to the multi-row data line D _M and is applied to the source s and the drain d of the thin film transistor 201. On the pixel electrode 202, the pixel 205 of the polarity inversion column of the first display region 210 is over-voltage-driven. The second gray scale voltage includes a first sub-gray voltage and a second sub-gray voltage, and for the same gray level, the absolute value of the first sub-gray voltage is greater than the second sub-gray voltage Absolute value. When the data driving circuit 23 receives the second gamma voltage, it correspondingly outputs the first sub-gray voltage, and when the data driving circuit 23 receives the first gamma voltage, it correspondingly outputs the second Sub-gray voltage.

For the non-polarity inverted column pixel 205, the timing control circuit 21 outputs the first voltage control signal to the gamma voltage generating circuit 25. The gamma voltage generating circuit 25 is configured to update the polarity of the polarity inversion signal according to the second voltage control signal and the data update signal, and correspondingly output the complex first gamma voltage with the same polarity as the sampled polarity This data drive circuit 23. The data driving circuit 23 updates the polarity of the sampling of the polarity inversion signal by the synchronization signal according to the data, and the received first gamma voltage, and the corresponding output complex number is the same as the gray level value of the low swing differential signal. And the first gray scale voltage is the same as the polarity of the sampling to the pixel 205 of the polarity inversion reverse column. And for the same gray level, the absolute value of the first gray scale voltage is equal to the absolute value of the second sub gray scale voltage.

The total time of the second voltage control signal is T1, and the total time of the first voltage control signal is T-T1, which is defined during the time T when the thin film transistor 201 is turned on. The ratio of T1 to the time T is the duty ratio of the second voltage control signal in the first display area 220, and the timing control circuit 21 outputs the duty of the second voltage control signal to the first display area 220. The ratio is the same. Correspondingly, the total time of the first sub-gray voltage output by the data driving circuit 23 under the control of the second voltage control signal is T1, and the output of the second sub-gray voltage is T-T1, then the first sub- The duty ratio of the gray scale voltage in the first display area 220 and the duty ratio of the second voltage control signal in the first display area 220 with. For the pixel 205 of the non-polarity inversion column, the time when the timing control circuit 21 outputs the first voltage control signal is the same as the time when a thin film transistor 201 is turned on, that is, T, so the data driving circuit 23 is The time of the first gray scale voltage of each pixel 205 outputted to the non-polarity inversion column under the control of the first voltage control signal is T.

Then, the timing control circuit 21 can determine that the pixel 205 of the second display area 220 starts to operate according to the vertical synchronization signal outputted to the scan driving circuit 22. The timing control circuit 21 sequentially outputs the second voltage control signal and the first voltage control signal to the gamma voltage generating circuit 25 for the pixel 205 of the polarity inversion column. The gamma voltage generating circuit 25 is configured to update the polarity of the polarity inversion signal according to the second voltage control signal and the data update signal, and correspondingly output a second gamma voltage having the same polarity as the sampled polarity to the The data driving circuit 23 outputs a plurality of first gamma voltages having the same polarity as the sampled voltage to the data driving circuit 23 according to the first voltage control signal. The data driving circuit 23 updates the polarity of the sampling of the polarity inversion signal by the synchronization signal according to the data, and sequentially receives the complex second gamma voltage and the complex first gamma voltage, and the corresponding output is low. a second gray scale voltage having the same grayscale value and the same polarity as the sampling is applied to the multi-row data line D _M and is applied to the source s and the drain d of the thin film transistor 201. The pixel electrode 202 is over-voltage-driven by the pixel 205 of the polarity inversion column of the second display region 220. The second gray scale voltage includes a first sub-gray voltage and a second sub-gray voltage, and for the same gray level, the absolute value of the first sub-gray voltage is greater than the absolute value of the second sub-gray voltage . When the data driving circuit 23 receives the second gamma voltage, it correspondingly outputs the first sub-gray voltage, and when the data driving circuit 23 receives the first gamma voltage, it correspondingly outputs the second Sub-gray voltage.

For the non-polarity inverted column pixel 205, the timing control circuit 21 outputs the first voltage control signal to the gamma voltage generating circuit 25. The gamma voltage generating circuit 25 controls the signal according to the second voltage and the data The polarity of the polarity inversion signal is updated by the synchronization signal, and the complex first digital gamma voltage having the same polarity as the sampled polarity is output to the data driving circuit 23. The data driving circuit 23 updates the polarity of the sampling of the polarity inversion signal by the synchronization signal according to the data, and the received first gamma voltage, and the corresponding output complex number is the same as the gray level value of the low swing differential signal. And the first gray scale voltage is the same as the polarity of the sampling to the pixel 205 of the polarity inversion reverse column. And for the same gray level, the absolute value of the first gray scale voltage is equal to the absolute value of the second sub gray scale voltage.

Wherein, in a time T when the thin film transistor 201 is turned on, the total time of the second voltage control signal outputted by the timing control circuit 21 is T2, and T2 is greater than T1, and the total time of the first voltage control signal is T- T2, the ratio of the time T2 to the time T is defined as the duty ratio of the second voltage control signal in the second display area 220, and the timing control circuit 21 outputs the second voltage to the second display area 220. The duty cycle of the control signals is the same. Correspondingly, the total time of the first sub-gray voltage output by the data driving circuit 23 under the control of the second voltage control signal is T2, and the output of the second sub-gray voltage is T-T2, then the first sub- The duty ratio of the gray scale voltage in the second display area 220 is the same as the duty ratio of the second voltage control signal in the second display area 220. For the pixel of the polarity-inverted column 205, the timing of the output of the first voltage control signal by the timing control circuit 21 is the same as the time when a thin film transistor 201 is turned on, that is, T, and therefore, the data driving circuit 23 is The time of the first gray scale voltage of each pixel 205 outputted to the non-polarity inversion column under the control of the first voltage control signal is T. Wherein, for the same gray level, the absolute value of the second sub-gray voltage is equal to the absolute value of the first gray level voltage.

Finally, the timing control circuit 21 determines that the pixel 205 of the third display area 230 starts to operate according to the vertical synchronization signal outputted to the scan driving circuit 22. The timing control circuit 21 sequentially outputs the second voltage control signal and the first voltage control signal to the gamma voltage generating circuit 25 for the pixel 205 corresponding to the polarity inversion column. The gamma voltage generating circuit 25 is configured to update the polarity of the polarity inversion signal according to the second voltage control signal and the data update signal, and correspondingly output a second gamma voltage having the same polarity as the sampled polarity to the The data driving circuit 23 outputs a plurality of first gamma voltages having the same polarity as the sampled voltage to the data driving circuit 23 according to the first voltage control signal. The data driving circuit 23 updates the polarity of the sampling of the polarity inversion signal by the synchronization signal according to the data, and sequentially receives the complex second gamma voltage and the complex first gamma voltage, and the corresponding output is low. a second gray scale voltage having the same grayscale value of the swing difference signal is applied to the multi-line data line D _M , and is applied to the pixel electrode 202 via the source s and the drain d of the thin film transistor 201 to The pixel 205 of the polarity inversion column of the third display area 230 is over-voltage driven. The second gray scale voltage includes a first sub-gray voltage and a second sub-gray voltage, and for the same gray level, the absolute value of the first sub-gray voltage is greater than the second sub-gray voltage Absolute value. When the data driving circuit 23 receives the second gamma voltage, it correspondingly outputs the first sub-gray voltage, and when the data driving circuit 23 receives the first gamma voltage, it correspondingly outputs the second Sub-gray voltage.

For the non-polarity inverted column pixel 205, the timing control circuit 21 outputs the first voltage control signal to the gamma voltage generating circuit 25. The gamma voltage generating circuit 25 is configured to update the polarity of the polarity inversion signal according to the second voltage control signal and the data update signal, and correspondingly output the complex first gamma voltage with the same polarity as the sampled polarity This data drive circuit 23. The data driving circuit 23 updates the polarity of the sampling of the polarity inversion signal by the synchronization signal according to the data, and the received first gamma voltage, and the corresponding output complex number is the same as the gray level value of the low swing differential signal. And the first gray scale voltage is the same as the polarity of the sampling to the pixel 205 of the polarity inversion reverse column. And for the same gray level, the absolute value of the first gray scale voltage is equal to the absolute value of the second sub gray scale voltage.

The time during which the timing control circuit 21 outputs the second voltage control signal is T3 during the time T when the thin film transistor 201 is turned on, and When T3 is greater than T2, the time for outputting the first voltage control signal is T-T3, and the ratio of the time T3 to the time T is defined as the duty ratio of the second voltage control signal in the third display area 230, and the The duty ratio of the second voltage control signal in the third display area 230 is the same. Correspondingly, the time of the first sub-gray voltage output by the data driving circuit 23 under the control of the second voltage control signal is T3, and the time of outputting the second sub-gray voltage is T-T3, that is, the The duty ratio of a sub-gray voltage in the third display area 230 is the same as the duty ratio of the second voltage control signal in the third display area 230. For the pixel of the polarity-inverted column 205, the timing of the output of the first voltage control signal by the timing control circuit 21 is the same as the time when a thin film transistor 201 is turned on, that is, T, and therefore, the data driving circuit 23 is The time of the first gray scale voltage of each pixel 205 outputted to the non-polarity inversion column under the control of the first voltage control signal is T. Wherein, for the same gray level, the absolute value of the second sub-gray voltage is equal to the absolute value of the first gray level voltage. By outputting the second gray scale voltage by the data driving circuit 23, overvoltage driving of the pixel 205 of the polarity inversion column can be realized. And the ratio of the absolute value of the difference between the first sub-gray voltage and the second sub-gray voltage sequentially outputted is the same as the ratio of the second sub-gray voltage, and is preferably 20%.

In summary, for the liquid crystal display 2, the data driving circuit 23 sequentially outputs the larger first sub-gray voltage and the normal second sub-gray voltage to the pixel of the polarity inversion column. 205. The pixel 205 of the polarity inversion column is further subjected to overvoltage driving, and the data driving circuit 23 outputs to the first display area 210 as the distance between the pixel 205 and the data driving circuit 23 increases. The duty ratios of the first sub-gray voltages of the pixels 205 of the second display area 220 and the third display area 230 are gradually increased, so that the second gray scale voltage is overdriven by the polarity inversion column pixels 205. The distance increases as the distance between the display area and the data driving circuit 23 increases. Therefore, selecting the appropriate size of the gray scale voltage and a first sub-duty ratio enables the first sub-row of the multi-gray scale voltage via the data line D _M transmission attenuation is actually output to the pixel electrode 202 The gray scale voltage is superimposed to be substantially the same as the second sub-gray voltage. Therefore, when the liquid crystal display 2 displays the same gray scale, the voltage loaded by the pixel 205 of the polarity inversion column substantially matches the absolute value of the voltage applied to the pixel 205 of the polarity inversion column, thereby improving The parity line phenomenon that occurs when the liquid crystal display 2 displays an image.

In addition, since the degree of overdrive of the second gray scale voltage to the polarity inversion column pixel 205 increases as the distance between the display area and the data driving circuit 23 increases, the second gray can also be improved. The step voltage is attenuating more and more during the transmission process.

The present invention is not limited to the above embodiment, and the manner in which the degree of overdrive of the second gray scale voltage to the polarity inversion column pixel 205 increases as the distance between the display area and the data driving circuit increases may be borrowed. The average voltage value of the second gray scale voltage acting on the display area is changed by controlling the amplitude of the first sub-gray voltage.

The liquid crystal panel 20 can also be divided into four or more display areas, and the length of each display area along the direction parallel to the data line D _M can also be different. Each display area includes at least one column of pixels 205. The duty ratios of the first sub-gray voltages of the same display area are the same, and the duty ratio of the first sub-gray voltages for different display areas increases as the distance between the display area and the data driving circuit 23 increases. And the absolute value of the second sub-gray voltage is equal to the absolute value of the second gray-scale voltage. The duty ratio of the first sub-gray voltage may vary from 0 to 100%.

The driving mode of the liquid crystal display may be a reverse polarity driving mode of polarity inversion of two columns, or a dot inversion driving mode of polarity inversion of two columns, or an inversion driving mode of one column plus two columns. Wait. The reverse driving manner of the one column plus two columns is: the polarity of the voltage applied to the pixel 205 of the same column in the second column and the third column of the liquid crystal display 2 is the same, and the first column and the second column are The polarities of the voltages applied to the pixels 205 of the same column are opposite, and the laws of the polarity of the voltages applied to the other columns 205 are the same as those of the first to third columns. The maximum voltage of each pixel 205 The sex is inverted frame by frame.

In addition, the reverse driving method of the column and the two columns may be: the polarity of the voltage applied to the pixels 205 of the same column in the first column and the second column of the liquid crystal display 2 is the same, and the third column and the second column are The polarities of the voltages applied to the pixels 205 of the same column in the column are opposite, and the laws of the polarity of the voltages applied to the other columns 205 are the same as those of the first column to the third column.

The liquid crystal display 2 can be driven in such a manner that the polarity is reversed every three or more columns. The liquid crystal display 2 can also adopt an inverted driving mode of three columns or three columns or more columns.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

2‧‧‧LCD display

20‧‧‧LCD panel

21‧‧‧Sequence Control Circuit

22‧‧‧Scan drive circuit

23‧‧‧Data Drive Circuit

24‧‧‧Common voltage generating circuit

25‧‧‧Gamma voltage generation circuit

G ₁ ~G _L ‧‧‧ scan line

D ₁ ~D _M ‧‧‧ data line

205‧‧‧ pixels

201‧‧‧film transistor

202‧‧‧ pixel electrodes

203‧‧‧Common electrode

G‧‧‧ gate

S‧‧‧ source

D‧‧‧汲

210‧‧‧First display area

220‧‧‧Second display area

230‧‧‧ Third display area

1 is a schematic view of a preferred embodiment of a liquid crystal display of the present invention.

2 is a schematic view showing the polarity of a voltage applied to a pixel of the liquid crystal display shown in FIG. 1.

3 is a timing chart showing the operation of the liquid crystal display shown in FIG. 1.

Claims (17)

A liquid crystal display includes a liquid crystal panel and a data driving circuit. The liquid crystal panel includes a plurality of pixels. For the same gray level, the data driving circuit outputs a plurality of first gray scale voltages to drive pixels of the polarity inversion column. And outputting a plurality of second gray scale voltages to drive the pixels of the polarity inversion column, each of the second gray scale voltages including a first sub-gray voltage and a second sub-gray voltage, the first sub-grey The step voltage and the second sub-gray voltages are continuously output to drive the same pixel of the polarity inversion column, wherein the absolute values of the first sub-gray voltages are greater than the absolute values of the second sub-gray voltages And the absolute values of the second sub-gray voltages are equal to the absolute values of the first gray scale voltages. The liquid crystal display of claim 1, wherein the liquid crystal panel comprises at least two display areas, each of the display areas comprising at least one column of pixels, wherein the first sub-gray scales for the same display area The duty ratios of the voltages are the same, and for different display regions, the duty ratios of the first sub-gray voltages increase as the distance between the display region and the data driving circuit increases. The liquid crystal display of claim 2, wherein the liquid crystal display comprises at least two columns of inverted or one column plus two columns of inverted liquid crystal displays. The liquid crystal display according to claim 2, wherein the duty ratio of the first sub-gray voltage varies from 0 to 100%. The liquid crystal display of claim 2, wherein a ratio of an absolute value of the difference between the first sub-gray voltage and the second sub-gray voltage to the second sub-gray voltage is 20%. The liquid crystal display of claim 5, wherein the liquid crystal display further comprises a timing control circuit, wherein the timing control circuit outputs a first voltage control signal for the same pixel of the polarity inversion reversal column, Correspondingly controlling the data driving circuit to output the first gray scale voltages, and for the same pixel of the polarity inversion column, the timing control circuit Continuously outputting a second voltage control signal and the first voltage control signal, and correspondingly controlling the data driving circuit to sequentially output the first sub-gray voltage and the second sub-gray voltage, wherein the second voltage The duty cycle of the control signal is the same as the duty cycle of the first sub-gray voltages. The liquid crystal display of claim 6, wherein the liquid crystal display further comprises a gamma voltage generating circuit, when the gamma voltage generating circuit receives the first voltage control signal output by the timing control circuit, The gamma voltage generating circuit outputs a complex first gamma voltage to the data driving circuit, and when the gamma voltage generating circuit receives the second voltage control signal output by the timing control circuit, the gamma voltage generating circuit Corresponding to outputting a plurality of second gamma voltages to the data driving circuit. The liquid crystal display of claim 7, wherein the data driving circuit first receives the second gamma voltages and correspondingly outputs the first sub-gray voltages for the pixels of the polarity inversion column And the data driving circuit receives the first gamma voltages and correspondingly outputs the second sub-gray voltages, and the data driving circuit receives the first pixels for the pixels of the non-polarity reversal column The gamma voltage correspondingly outputs the first gray scale voltages. A liquid crystal display comprising a liquid crystal panel and a data driving circuit, the liquid crystal panel comprising at least two display areas, each of the display areas comprising at least one column of pixels, wherein the data driving circuit outputs the same gray level a plurality of first gray scale voltages to drive pixels of the polarity inversion reversal column, and output a plurality of second gray scale voltages to drive the pixels of the polarity inversion column to be overvoltage, and for the same display area, the second gray scales The voltage is reversed to the same extent as the polarity inversion column pixel, and for different display regions, the degree of overdrive of the second gray scale voltage to the polarity inversion column pixel is between the display region and the data driving circuit. The distance increases and increases. The liquid crystal display of claim 9, wherein each The second gray scale voltage includes a first sub-gray voltage and a second sub-gray voltage. For the same gray level, the absolute values of the first sub-gray voltages are greater than the second sub-gray voltages. Absolute value, and the absolute values of the second sub-gray voltages are equal to the absolute values of the first gray scale voltages, and the first sub-gray voltages and the second sub-gray voltages are continuously output to be driven This polarity reverses the same pixel listed. The liquid crystal display of claim 10, wherein the liquid crystal display comprises at least two columns of inverted or one column plus two columns of inverted liquid crystal displays. The liquid crystal display according to claim 10, wherein the duty ratio of the first sub-gray voltage varies from 0 to 100%. The liquid crystal display of claim 10, wherein a ratio of an absolute value of the difference between the first sub-gray voltage and the second sub-gray voltage to the second sub-gray voltage is 20%. The liquid crystal display of claim 13, wherein the liquid crystal display further comprises a timing control circuit, wherein the timing control circuit outputs a first voltage control signal for the same pixel of the polarity inversion reversal column, Correspondingly controlling the data driving circuit to output the first gray scale voltages, and for the same pixel of the polarity inversion column, the timing control circuit continuously outputs a second voltage control signal and the first voltage control signal, corresponding control The data driving circuit sequentially outputs the first sub-gray voltage and the second sub-gray voltage, wherein a duty ratio of the second voltage control signal and a duty ratio of the first sub-gray voltages the same. The liquid crystal display of claim 14, wherein the liquid crystal display further comprises a gamma voltage generating circuit, when the gamma voltage generating circuit receives the first voltage control signal output by the timing control circuit, The gamma voltage generating circuit outputs a complex first gamma voltage to the data driving circuit, and when the gamma voltage generating circuit receives the second voltage control signal output by the timing control circuit, the gamma voltage generating circuit Corresponding to output complex second gamma voltage to the data Drive circuit. The liquid crystal display of claim 15, wherein, for the pixels of the polarity inversion column, the data driving circuit first receives the second gamma voltages and correspondingly outputs the first sub-gray voltages. And the data driving circuit receives the first gamma voltages and correspondingly outputs the second sub-gray voltages, and the data driving circuit receives the first pixels for the pixels of the non-polarity reversal column The gamma voltage correspondingly outputs the first gray scale voltages. The liquid crystal display of claim 16, wherein, for different display areas, an average voltage value of the second gray scale voltages for overdriving is a function of a distance between the display area and the data driving circuit. Increase and increase.