KR20050113853A - Liquid crystal display device - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device which can improve luminance imbalance due to color generated when a two-dot inversion system is driven in an RGBW quad type liquid crystal display device.

The present invention provides a display device comprising: a first sub pixel for displaying a first color; A second sub pixel for displaying a second color; A third sub pixel for displaying a third color; And a fourth sub-pixel displaying a fourth color, different ones of the first and second sub-pixels are disposed in 2m-1 and 2m columns of the 2n-1 rows, respectively, and in the 2m-1 columns of the 2n rows, respectively. Different ones of the third and fourth subpixels are arranged in 2m columns to form a first pixel, and different ones of the third and fourth subpixels are arranged in 2m + 1 and 2m + 2 columns of the 2n-1 rows. Each of the first and second sub-pixels is disposed in a 2m + 1 column and a 2m + 2 column of the second n row, respectively, to form a second pixel, and the first and second pixels are arranged in a row and column direction. Repeatedly arranged, m and n provide one or more liquid crystal display device.

According to the present invention, when driving an RGBW quad system liquid crystal display in a vertical two-dot inversion method, sub-pixels displaying the same color are alternately arranged in adjacent odd-numbered rows and even-numbered rows and applied to colors. There is an effect that can improve the non-uniformity of the brightness.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to an RGBW quad type liquid crystal display device and a driving method thereof.

As a flat panel display device widely used at present, a television or a monitor such as a cathode ray tube (CRT) is used. Meanwhile, there is a need for a flat panel display having excellent characteristics such as thinness, light weight, and low power consumption, and a liquid crystal display, a plasma display panel, and a field emission display have emerged. Various flat panel display devices such as a field emission display and an electroluminescent display (or electroluminescence display (ELD)) have been researched and developed.

Among the various flat panel display devices described above, liquid crystal display devices having excellent characteristics such as thinning, light weight, and low power consumption are being actively applied to notebooks and monitors.

A liquid crystal display device displays an image by using optical anisotropy and birefringence characteristics of liquid crystal molecules. When an electric field is applied, the alignment of liquid crystals is changed, and the characteristics of light transmission vary according to the changed alignment direction of liquid crystals. The display device arranges two substrates on which the field generating electrodes are formed so that the surfaces on which the two electrodes are formed face each other, injects a liquid crystal material between the two substrates, and then applies an electric voltage generated by applying a voltage to the two electrodes. By moving the liquid crystal molecules, the device expresses an image by the transmittance of light that varies accordingly.

In the liquid crystal display, pixels, which are color display units, are arranged in a matrix to display an image. Generally, pixels are R, G, and B sub-pixels that display red, green, and blue colors, respectively. And display the color image.

Recently, in order to increase the luminance of white color, a liquid crystal display device in which four subpixels form one pixel by adding a W subpixel displaying white color to R, G, and B subpixels is used.

FIG. 1 is a diagram illustrating a sub pixel arrangement of an RGBW stripe type liquid crystal display device. Here, m and n represent the horizontal resolution and the vertical resolution of the liquid crystal display device, respectively.

As illustrated, one pixel P includes R, G, B, and W subpixels arranged in one row direction.

Each sub pixel is connected to the gate and data lines GL _n , GL _{n + 1} , GL _{n + 2} , GL _{n + 3} , DL _4m-3 , DL _4m-2 , DL _4m-1 , and DL _4m . Although not illustrated, a thin film transistor connected to a gate and a data line is positioned in each sub pixel, and the thin film transistor is switched according to the gate signal, and the data signal is transmitted to each sub pixel. Each sub pixel displaying the same color is connected to the same data line.

In the RGBW stripe type liquid crystal display, the gate wiring is sequentially applied to the gate wirings GL _n , GL _{n + 1} , GL _{n + 2} , and GL _{n + 3} during one frame, and the gate wiring to which the gate on signal is applied. The sub-pixels connected to (GL _n , GL _{n + 1} , GL _{n + 2} , GL _{n + 3} ) are turned on to disconnect the data wires (DL _4m-3 , DL _4m-2 , DL _4m-1 , DL _4m ). The data signal is transmitted through.

2 is a diagram illustrating a sub pixel arrangement of an RGBW quad type liquid crystal display device. Here, m and n represent the horizontal resolution and the vertical resolution of the liquid crystal display device, respectively.

As illustrated, one pixel P includes four subpixels R, G, B, and W arranged in two rows and columns.

R and G subpixels are alternately arranged in odd-numbered rows 2n-1 and 2n + 1, and W and B subpixels are alternately arranged in even-numbered rows 2n and 2n + 2.

The subpixels located in the same column, that is, the R and W subpixels and the G and B subpixels are respectively connected to one data line DL _2m-1 , DL _2m , DL _{2m + 1} , and DL _{2m + 2} .

In the RGBW quad type liquid crystal display, like the RGBW stripe type liquid crystal display, the gate-on signal is sequentially applied to the gate lines GL _2n-1 , GL _2n , GL _{2n + 1} , and GL _{2n + 2} during one frame. do. The sub-pixels connected to the gate wirings GL _2n-1 , GL _2n , GL _{2n + 1} , and GL _{2n + 2} are turned on so that the data wirings DL _2m-1 , DL _2m , DL _{2m + 1} , DL _{2m + 2} The data signal is applied through the N s, and since two different sub pixels are alternately arranged on one data line, data signals corresponding to each of the two different sub pixels are alternately applied to one data line.

However, in the case of having the same vertical resolution n, the RGBW quad type liquid crystal display has 2n gate wirings, and the RGBW stripe type liquid crystal display has n gate wirings. Therefore, in the case of having the same vertical resolution, the charging time of the subpixels of the RGBW quad type liquid crystal display device is reduced by 2 times compared to the subpixels of the RGBW stripe type liquid crystal display device.

In particular, when the RGBW quad type liquid crystal display device operates in a dot inversion method, the charging characteristic of the sub pixel is degraded.

3 is a diagram illustrating the sub-pixel polarity of a conventional RGBW quad type liquid crystal display device driven by a dot inversion method.

As shown, sub-pixels neighboring each other are charged with different polarities, and the polarities of the sub-pixels are reversed every frame.

The R sub pixel connected to the 2n-1 th gate line and the 2m-1 th data line has a positive polarity, and the W sub pixel connected to the 2n th gate line and the 2m-1 th data line is negative. ) Polarized. Therefore, when the gate-on voltage is applied to the 2n-th gate line, a data signal having a positive polarity is applied to the 2m-th data line, and 2m when the gate-on voltage is applied to the 2n-th gate line. A negative polarity data signal is applied to the -1th data line.

As the odd-numbered and even-numbered gate lines are sequentially driven, data voltages should be applied to one data line with alternating positive and negative polarities. In particular, in the case of the RGBW quad method, the RGBW stripe method Since the gate wiring is doubled and the charging time is reduced compared with that, the charging characteristics of the sub-pixels are deteriorated. Vertical line dim occurs due to deterioration of the charging characteristics.

A vertical two-dot inversion scheme is used to improve the deterioration of the charging characteristics of the sub-pixels generated when the RGBW liquid crystal display is driven by the dot inversion scheme.

4 is a diagram illustrating the sub-pixel polarity of a conventional RGBW quad type liquid crystal display device driven by a vertical two-dot inversion method.

As shown in the figure, in the vertical two-dot inversion method, the sub-pixels of the RGBW quad-type liquid crystal display have two sub-pixels neighboring in the column direction with the same polarity and are inverted in two rows. Sub-pixels arranged in two neighboring columns have different polarities and their polarities are inverted in units of two columns.

The R subpixels connected to the 2n-1th gate line and the 2m-1th data line and the W subpixels connected to the 2nth gate line and the 2m-1th data line have positive polarities. Therefore, when the gate-on voltage is sequentially applied to the 2n-1 < th > and the 2n < th > gate lines, the data signal of positive polarity is continuously applied to the 2m < -1 >

In the vertical two-dot inversion scheme, as odd-numbered and even-numbered gate lines are sequentially applied, data signals having the same polarity are continuously applied to the data lines. Therefore, it is possible to improve the deterioration of the charging characteristic of the sub pixel in the dot inversion method.

However, in the two-dot inversion method, the charging characteristic of the subpixels arranged in the odd-numbered rows is lower than that of the subpixels arranged in the even-numbered rows.

The W subpixel connected to the 2nth gate line and the 2m-1th data line has a positive polarity, and the R subpixel connected to the 2n + 1th gate line and the 2m-1th data line is negative. ) Polarized. Therefore, when the gate-on voltage is sequentially applied to the 2n-th gate wiring and the 2n + 1th gate wiring, as in the dot inversion method, the positive and negative polarities are applied to the 2m-1 data wiring. The data voltages should be applied alternately. When the gate-on voltage is sequentially applied to the 2n + 1 th gate wiring and the 2n + 2 th gate wiring, the data voltage of negative polarity is continuously applied to the data wiring.

Therefore, the subpixels connected to the 2n + 2th gate lines have better charging characteristics than the subpixels connected to the 2n + 1th gate lines.

FIG. 5 illustrates driving waveforms of data signals applied to data lines in a vertical two-dot inversion scheme, in which driving waveforms of data signals charged in B and W sub-pixels arranged in even-numbered rows are odd-numbered rows. It has a higher value than the driving waveform of the data signal charged in the R and G sub-pixels arranged in the. Accordingly, the B and W subpixels arranged in the even rows have better charging characteristics than the R and G subpixels arranged in the odd rows.

As described above, the B and W subpixels arranged in the even rows have better charging characteristics than the R and G subpixels arranged in the odd rows, so that the luminance of the blue and white colors is higher than that of the red and green colors. It has a high value, the color temperature of the white color of the liquid crystal display device is increased, the luminance imbalance according to the color occurs.

In particular, in an in-plane switching mode (IPS) liquid crystal display device which is driven normally black, the data signal charging state of the sub-pixel determines the luminance, thereby making it a vertical two-dot inversion method. In the case of driving, luminance unbalance according to color becomes more problematic.

An object of the present invention for solving the above problems is to provide a liquid crystal display device that can improve the luminance imbalance according to the color generated when the RGBW quad type liquid crystal display device is driven in a two-dot inversion method. In providing.

In order to achieve the object as described above, the present invention comprises: a first sub pixel for displaying a first color; A second sub pixel for displaying a second color; A third sub pixel for displaying a third color; And a fourth sub-pixel displaying a fourth color, different ones of the first and second sub-pixels are disposed in 2m-1 and 2m columns of the 2n-1 rows, respectively, and in the 2m-1 columns of the 2n rows, respectively. Different ones of the third and fourth subpixels are arranged in 2m columns to form a first pixel, and different ones of the third and fourth subpixels are arranged in 2m + 1 and 2m + 2 columns of the 2n-1 rows. Each of the first and second sub-pixels is disposed in a 2m + 1 column and a 2m + 2 column of the second n row, respectively, to form a second pixel, and the first and second pixels are arranged in a row and column direction. Repeatedly arranged, m and n provide one or more liquid crystal display device.

Here, the sub-pixels arranged in the second n-1 and 2n rows of one of the second m-1, 2m, 2m + 1, and 2m + 2 columns may have one of positive and negative polarities. It may have a polarity of. The sub-pixels arranged in the second m-1, 2m + 2 columns of one of the 2n-1, 2n rows have a polarity of one of a positive polarity and a negative polarity, and the second m The sub-pixels arranged in the 2m + 1 column may have the other polarity of positive polarity and negative polarity.

Then, different ones of the first and second subpixels are disposed in 2m-1 and 2m columns of the 2n + 1 row, respectively, and among the third and fourth subpixels in the 2m-1 and 2m columns of the 2n + 2 row, respectively. One each other is arranged to form a third pixel, and the other one of the third and fourth sub-pixels is disposed in the 2m + 1 column and the 2m + 2 column of the second n + 1 row, respectively, and the second n + 2 row. Different ones of the first and second sub-pixels are respectively arranged in 2m + 1 and 2m + 2 columns of to form a fourth pixel, and the first, second, third, and fourth pixels are repeatedly arranged in the column and row directions, and The sub-pixels arranged in rows 2n-1 and 2n of one of columns 2m-1, 2m, 2m + 1, and 2m + 2 have a polarity of one of a positive polarity and a negative polarity. In addition, the sub-pixels arranged in the 2n + 1 and 2n + 2 rows may have polarities of the other of positive polarity and negative polarity. The sub-pixels arranged in the second m-1, 2m + 2 columns of one of the 2n-1, 2n, 2n + 1, and 2n + 2 rows may have one of positive and negative polarities. The sub-pixels arranged in the second and second columns of 2m and 2m + 1 may have a polarity of the other of positive polarity and negative polarity.

In addition, the first, second, third, and fourth colors may be different colors among red, green, blue, and white colors, respectively.

In another aspect, the present invention provides a display device comprising: a first sub-pixel displaying a first color; A second sub pixel for displaying a second color; A third sub pixel for displaying a third color; And a fourth sub-pixel displaying a fourth color, different ones of the first and second sub-pixels are disposed in 2m-1 and 2m columns of the 2n-1 rows, respectively, and in the 2m-1 columns of the 2n rows, respectively. Different ones of the third and fourth subpixels are arranged in 2m columns to form a first pixel, and different ones of the third and fourth subpixels are arranged in 2m + 1 and 2m + 2 columns of the 2n-1 rows. Each of the first and second sub-pixels is disposed in 2m + 1 and 2m + 2 columns of the 2n row, respectively, to form a second pixel, and 2m + 3 and 2m in the 2n-1 rows. Different ones of the third and fourth sub-pixels are disposed in a +4 column, respectively, and different ones of the first and second sub-pixels are arranged in the 2m + 3 column and the 2m + 4 column of the second n row, respectively. And different ones of the first and second sub-pixels are disposed in 2m + 5 and 2m + 6 columns of the 2n-1 row, respectively, Different ones of the third and fourth sub-pixels are disposed in 2m + 5 and 2m + 6 columns of the second 2n row, respectively, to form a fourth pixel, and the first, second, third, and fourth pixels are repeated in the column and row directions. And m and n are one or more liquid crystal display devices.

Wherein the 2m-1, 2m, 2m + 1, 2m + 2, 2m + 3, 2m + 4, 2m + 5, 2m + 6 columns disposed in the second 2n-1, 2n rows of the column The sub pixel may have one of positive polarity and negative polarity. The sub-pixels arranged in the 2m-1, 2m + 2, 2m + 3, and 2m + 6 columns of one of the 2n-1, 2n rows may have one of positive and negative polarities. The sub-pixels arranged in the 2m, 2m + 1, 2m + 4, and 2m + 5 columns may have polarities of the other of positive polarity and negative polarity.

Then, different ones of the first and second subpixels are disposed in 2m-1 and 2m columns of the 2n + 1 row, respectively, and among the third and fourth subpixels in the 2m-1 and 2m columns of the 2n + 2 row, respectively. Different ones are respectively arranged to form a fifth pixel, and different ones of the third and fourth sub-pixels are arranged in 2m + 1 and 2m + 2 columns of the 2n + 1 row, respectively, and the second n + 2 row. One of the first and second sub-pixels is disposed in 2m + 1 and 2m + 2 columns, respectively, to form a sixth pixel, and the third and fourth columns in the 2m + 3 and 2m + 4 columns of the second n + 1 row. Different ones of the subpixels are disposed respectively, and different ones of the first and second subpixels are respectively disposed in 2m + 3 and 2m + 4 columns of the second n + 2 row to form a seventh pixel, and the second n One of the first and second sub-pixels is arranged in 2m + 5 and 2m + 6 columns of the +1 row, respectively, and in the 2m + 5 and 2m + 6 columns of the 2n + 2 rows. Different ones of the third and fourth sub-pixels are arranged to form an eighth pixel, and the first, second, third, fourth, fifth, sixth, seventh, and eighth pixels are repeatedly arranged in column and row directions. The sub-pixels arranged in rows 2n-1 and 2n of one of 2m-1, 2m, 2m + 1, 2m + 2, 2m + 3, 2m + 4, 2m + 5, and 2m + 6 columns are positive. The sub-pixels having one of positive polarity and negative polarity, and arranged in the second n + 1 and 2n + 2 rows, have the polarity of the other of positive and negative polarities. Can have The sub-pixels arranged in the second m-1, 2m + 2, 2m + 3, and 2m + 6 columns of one of the 2n-1, 2n, 2n + 1, and 2n + 2 rows are positive (+) polarities. The sub-pixels having polarity of one of a polarity and a negative polarity, and arranged in the second, second, second, second and second columns of the second and second polarities, respectively, are positive and negative polarities. It can have polarity.

In addition, the first, second, third, and fourth colors may be different colors among red, green, blue, and white colors, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>

6 and 7 are diagrams showing the arrangement of the sub pixels and the polarities of the sub pixels in the RGBW quad type liquid crystal display according to the first embodiment of the present invention. Here, m and n represent the horizontal resolution and the vertical resolution of the liquid crystal display device, respectively.

As shown, first, second, third, and fourth pixels P1, P2, P3, and P4 are positioned in an RGBW quad type liquid crystal display according to an exemplary embodiment of the present invention. The first, second, third, and fourth pixels P1, P2, P3, and P4 are arranged in a row and column direction as one unit to form an RGBW quad type liquid crystal display.

The first and second pixels P1 and P2 are adjacent to each other in the row direction, and the third and fourth pixels P3 and P4 are adjacent to each other in the row direction. The first and third pixels P1 and P3 are adjacent to each other in the column direction, and the second and fourth pixels P2 and P4 are adjacent to each other in the column direction.

Each of the first, second, third, and fourth pixels P1, P2, P3, and P4 includes R, G, B, and W subpixels, which are four subpixels arranged in two adjacent rows and two columns. Each of the R, G, B, and W sub pixels displays red, green, blue, and white colors, respectively.

FIG. 8 is a circuit diagram illustrating each sub-pixel. The sub-pixels include a thin film transistor T connected to gate and data lines GL and DL, and a liquid crystal capacitor and a storage capacitor C _LC connected to the thin film transistor T. , C _ST ). The thin film transistor T is turned on / off according to a gate signal transmitted through the gate line GL, and a data signal transmitted through the data line DL is turned on in the liquid crystal capacitor and storage. The capacitors C _LC and C _ST are charged. The data signal charged in the liquid crystal capacitor and the storage capacitor C _LC and C _ST is maintained until the next on state, even if the thin film transistor T is turned off.

As illustrated in FIG. 6, sub-pixel arrangements are the same for the first and third pixels P1 and P3 and the second and fourth pixels P2 and P4 that are adjacent to each other in the column direction.

In the odd-numbered rows 2n-1 and 2n + 1 of the first pixel P1 and the third pixel P3, R and G sub-pixels are arranged in columns 2m-1 and 2m, respectively, and the first pixel P1 In the even-numbered rows 2n and 2n + 2 of the third pixel P3, the W and B sub-pixels are arranged in columns 2m-1 and 2m, respectively. In the second and second pixels P2 and P4, the W and B sub-pixels are arranged in 2m + 1 and 2m + 2 columns in odd-numbered rows 2n-1 and 2n + 1, respectively, R and G subpixels are arranged in 2m + 1 and 2m + 2 columns in the even-numbered rows 2n and 2n + 2 of P2 and the fourth pixel P4, respectively.

That is, pixels neighboring in the column direction have the same sub pixel arrangement. Sub-pixels that are identical to each other in the row direction are arranged in such a manner that rows are alternated, and sub-pixels located in odd-numbered rows of the selected pixel are positioned in even-numbered rows in pixels neighboring in the row direction of the selected pixel.

Sub-pixels arranged in the same column are connected to the same data line. Sub-pixels arranged in each of 2m-1, 2m, 2m + 1, and 2m + 2 columns are connected to the same data lines DL _2m-1 , DL _2m , DL _{2m + 1} , DL _{2m + 2} , and R and W The subpixels and the G and B subpixels are each connected to one data line.

The gate-on signals are sequentially applied to the gate lines GL _2n-1 , GL _2n , GL _{2n + 1} , and GL _{2n + 2} during one frame. The sub-pixels connected to the gate wirings GL _2n-1 , GL _2n , GL _{2n + 1} , and GL _{2n + 2} are turned on so that the data wirings DL _2m-1 , DL _2m , DL _{2m + 1} , DL _{2m + 2} The data signal is applied through the N s, and since two different sub pixels are alternately arranged on one data line, data signals corresponding to each of the two different sub pixels are alternately applied to one data line.

The sub-pixel to which the data signal is applied during one frame is charged until the next frame to maintain its polarity.

The RGBW quad type liquid crystal display according to the exemplary embodiment of the present invention is driven in a vertical two-dot inversion scheme. The polarity of the sub-pixels maintained during one frame is shown in FIG. 7.

As shown in FIG. 7, two subpixels positioned in two rows of the same column of each of the pixels P1, P2, P3, and P4, that is, odd and even rows, have the same polarity. Sub-pixels in the same column of two pixels neighboring in the column direction have different polarities. That is, two sub-pixels positioned in odd-numbered and even-numbered rows adjacent to each other in the same column have the same polarity and their polarities are inverted in units of two rows.

For example, an R sub pixel connected to a 2n-1 th gate line GL _2n-1 and a 2m-1 th data line DL _2m-1 , and a 2n th gate wiring GL _2n and a 2m-1 th data. The W sub pixel connected to the wiring DL _2m-1 has a positive polarity and is connected to the 2n + 1th gate wiring GL _{2n + 1} and the 2m-1th data wiring DL _2m-1 . The W sub pixel connected to the R sub pixel, the 2n + 2th gate line GL _{2n + 2} , and the 2m−1 th data line DL _2m−1 has a negative polarity.

Here, in order that two sub-pixels positioned in the odd-numbered and even-numbered rows adjacent to each other have the same polarity, data signals having the same polarity continue to be applied to the data lines while the adjacent odd-numbered and even-numbered gate wirings are sequentially driven. Is applied.

Sub-pixels arranged in neighboring columns of each pixel have different polarities. Subpixels in which two pixels are arranged in two adjacent columns have the same polarity. That is, two sub-pixels positioned in odd-numbered and even-numbered columns adjacent to each other in the same row have different polarities, and polarities are inverted in units of two columns.

For example, the R sub pixel connected to the 2n-1 th gate line GL _2n-1 and the 2 m-1 th data line DL _2m-1 has a positive polarity and the 2 n-1 th gate line The G sub pixel connected to the GL _2n-1 and the 2mth data line DL _2m has a negative polarity. The W sub pixel connected to the 2n-1 th gate line GL _2n-1 and the 2m + 1 th data line DL _{2m + 1} has a negative polarity, and the 2n-1 th gate line GL _The B sub-pixel connected to _2n-1 ) and the 2m + 2th data line DL _{2m + 2} has a positive polarity.

As described above, in the first embodiment of the present invention, sub-pixels displaying the same color are alternately arranged in the odd-numbered and even-numbered rows adjacent to each other. That is, R and G subpixels are arranged in odd-numbered rows 2n-1 of the first pixel P1, and R and G subpixels are arranged in even-numbered rows 2n of the second pixel P2.

Therefore, when driving an RGBW quad type liquid crystal display in a vertical two-dot inversion method, subpixels displaying the same color are uniformly alternately arranged in adjacent odd-numbered rows and even-numbered rows, and thus luminance corresponding to colors is obtained. The nonuniformity of is improved.

Second Embodiment

In the first embodiment of the present invention shown in FIG. 7, each subpixel located in the same row has the same polarity. That is, the R subpixels positioned in 2n-1 and 2n + 2 rows have positive polarity, and the R subpixels positioned in 2n and 2n + 1 rows have negative polarity. Therefore, when displaying a single color, such as red, it is driven like a line inversion to generate a line flicker.

Therefore, the second embodiment of the present invention proposes a sub pixel arrangement and a sub pixel polarity relationship that can improve the line flicker that may occur in the first embodiment.

FIG. 9 is a diagram illustrating arrangement of subpixels and polarities of subpixels of an RGBW quad type liquid crystal display according to a second exemplary embodiment of the present invention.

In the second embodiment of the present invention, description of the same or corresponding matters as the first embodiment of the present invention will be omitted.

As shown, the RGBW quad type liquid crystal display according to an exemplary embodiment of the present invention includes first, second, third, fourth, fifth, sixth, seventh and eighth pixels (P1, P2, P3, P4, P5, P6, and P7). , P8) The first, second, third, fourth, fifth, sixth, seventh, eighth pixels (P1, P2, P3, P4, P5, P6, P7, and P8) form one unit in a row and a column. Arranged in a direction to form an RGBW quad type liquid crystal display device.

The first, second, third, and fourth pixels P1, P2, P3, and P4 in the second embodiment have the same subpixel arrangement and polarity as in the first embodiment. The RGBW quad LCD according to the second embodiment is driven in a vertical two-dot inversion scheme.

The fifth pixel P5 has the same subpixel arrangement structure as the second pixel P2, and the sixth pixel P6 has the same structure as the first pixel P1. W and B subpixels are arranged in 2m + 3 and 2m + 4 columns in 2n-1 rows, which are odd rows, of the fifth pixel P5, and R and G subpixels are 2m + 3 and 2m in 2n rows, which are even rows, respectively. Are placed in each of +4 columns. That is, in the 6th pixel P6, R and G subpixels are arranged in 2m + 5 and 2m + 6 columns in 2n-1 rows, which are odd rows, and W and B subpixels are 2m in 2n rows, even rows. It is arranged in +5 and 2m + 6 rows respectively.

As described above, the seventh pixel P7 has the same subpixel arrangement structure as the fourth pixel P4 and the eighth pixel P8 as the third pixel P3.

The polarities of the subpixels arranged in the fifth, sixth, seventh, and eighth pixels P5, P6, P7, and P8 are determined by a vertical two-dot inversion scheme as in the first embodiment.

For example, R subpixels positioned in 2n rows and 2m + 3 columns have positive polarity, and R subpixels positioned in 2n-1 rows and 2m + 5 columns have negative polarities. The G subpixels positioned in 2n rows and 2m + 4 columns have negative polarities, and the G subpixels positioned in rows 2n-1 and 2m + 6 columns have positive polarities.

That is, the same sub-pixels arranged in the same row have both a positive polarity and a negative polarity during one frame. Therefore, when a single color is displayed, it is driven like a line inversion, thereby improving a phenomenon in which line flicker occurs.

In the above-described embodiment of the present invention, the liquid crystal display device is described as an example, but the present invention can be applied to a display device driven using the RGBW quad method.

Embodiment of the present invention as described above is an example of the present invention, various modifications are possible. It is obvious that such modifications fall within the scope of the present invention within the scope included in the spirit of the present invention.

As described above, according to the present invention, when driving an RGBW quad system liquid crystal display in a vertical two-dot inversion scheme, sub-pixels displaying the same color are uniformly alternated in adjacent odd-numbered rows and even-numbered rows. It is arranged to have an effect that can improve the unevenness of the luminance according to the color.

1 is a diagram showing a sub pixel arrangement of an RGBW stripe system and an RGBW quad system liquid crystal display;

FIG. 2 is a diagram showing a sub pixel arrangement of an RGBW quad type liquid crystal display; FIG.

3 is a diagram illustrating the sub-pixel polarity of a conventional RGBW quad type liquid crystal display device driven by a dot inversion method.

4 is a diagram showing the sub-pixel polarity of a conventional RGBW quad type liquid crystal display device driven by a vertical two-dot inversion method.

5 is a view showing a drive waveform of a data signal applied to a data line in a vertical two-dot inversion scheme.

6 and 7 are diagrams showing the arrangement of the sub pixels and the polarity of the sub pixels in the RGBW quad type liquid crystal display according to the first embodiment of the present invention, respectively.

Fig. 8 is a circuit diagram showing each sub pixel according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating arrangement of subpixels and polarities of subpixels of an RGBW quad type liquid crystal display according to a second exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

P1, P2, P3, P4: 1st, 2nd, 3rd, 4th pixel

R, G, B, W: sub pixel

GL _2n-1 , GL _2n , GL _{2n + 1} , GL _{2n + 2} : Gate Wiring

DL _2m-1 , DL _2m , DL _{2m + 1} , DL _{2m + 2} : data wiring

Claims (12)

A first sub pixel for displaying a first color; A second sub pixel for displaying a second color; A third sub pixel for displaying a third color; A fourth sub-pixel displaying a fourth color, Different ones of the first and second sub-pixels are arranged in 2m-1 and 2m columns of the 2n-1th row, and different ones of the third and fourth sub-pixels are arranged in the 2m-1 and 2m columns of the 2n-th row. Are each arranged to form a first pixel, Different ones of the third and fourth sub-pixels are disposed in 2m + 1 and 2m + 2 columns of the 2n-1 row, respectively, and the first and second subs in the 2m + 1 and 2m + 2 columns of the second n-th row. Different ones of the pixels are disposed to form a second pixel, The first and second pixels are repeatedly arranged in a row and column direction, M and n are 1 or more. The method of claim 1, The sub-pixels arranged in rows 2n-1 and 2n of one of the columns 2m-1, 2m, 2m + 1, and 2m + 2 have a polarity of one of a positive polarity and a negative polarity. Liquid crystal display having a. The method of claim 2, The sub-pixels arranged in the second m-1, 2m + 2 columns of one of the 2n-1, 2n rows have a polarity of one of a positive polarity and a negative polarity, and the second m And the sub-pixels arranged in a 2m + 1 column have a polarity of the other of positive polarity and negative polarity. The method of claim 1, Different ones of the first and second subpixels are disposed in 2m-1 and 2m columns of the 2n + 1 row, respectively, and different ones of the third and fourth subpixels in the 2m-1 and 2m columns of the 2n + 2 row, respectively. Each one is arranged to form a third pixel, Different ones of the third and fourth sub-pixels are disposed in the 2m + 1 and 2m + 2 columns of the second n + 1 row, respectively, and the first and second columns of the 2m + 1 and 2m + 2 columns of the second n + 2 row are disposed. Different ones of the 2 sub pixels are arranged to form a fourth pixel, The first, second, third, and fourth pixels are repeatedly arranged in column and row directions, The sub-pixels arranged in rows 2n-1 and 2n of one of the columns 2m-1, 2m, 2m + 1, and 2m + 2 have a polarity of one of a positive polarity and a negative polarity. And the sub-pixels arranged in the 2n + 1 and 2n + 2 rows have a polarity of one of a positive polarity and a negative polarity. The method of claim 4, wherein The sub-pixels arranged in the second m-1, 2m + 2 columns of one of the 2n-1, 2n, 2n + 1, and 2n + 2 rows may have one of positive and negative polarities. Wherein the sub-pixels arranged in the second and second columns have a polarity of the other of positive polarity and negative polarity. The method of claim 1, And the first, second, third and fourth colors are different from among red, green, blue and white colors. A first sub pixel for displaying a first color; A second sub pixel for displaying a second color; A third sub pixel for displaying a third color; A fourth sub-pixel displaying a fourth color, Different ones of the first and second sub-pixels are arranged in 2m-1 and 2m columns of the 2n-1th row, and different ones of the third and fourth sub-pixels are arranged in the 2m-1 and 2m columns of the 2n-th row. Are each arranged to form a first pixel, Different ones of the third and fourth sub-pixels are disposed in 2m + 1 and 2m + 2 columns of the 2n-1 row, respectively, and the first and second subs in the 2m + 1 and 2m + 2 columns of the second n-th row. Different ones of the pixels are disposed to form a second pixel, Different ones of the third and fourth sub-pixels are disposed in the 2m + 3 and 2m + 4 columns of the 2n-1 row, respectively, and the first and second subs in the 2m + 3 and 2m + 4 columns of the second nn row. Different ones of the pixels are arranged to form a third pixel, Different ones of the first and second sub-pixels are arranged in 2m + 5 and 2m + 6 columns of the 2n-1th row, respectively, and the third and fourth subs in 2m + 5 and 2m + 6 columns of the second nn row. Different ones of the pixels are arranged to form a fourth pixel, The first, second, third, and fourth pixels are repeatedly arranged in column and row directions, M and n are 1 or more. The method of claim 7, wherein The sub-pixels arranged in rows 2n-1 and 2n of one of the columns 2m-1, 2m, 2m + 1, 2m + 2, 2m + 3, 2m + 4, 2m + 5, and 2m + 6 A liquid crystal display device having one polarity of positive polarity and negative polarity. The method of claim 8, The sub-pixels arranged in the 2m-1, 2m + 2, 2m + 3, and 2m + 6 columns of one of the 2n-1, 2n rows may have one of positive and negative polarities. And sub-pixels arranged in the second, second, second, second and second columns of the second, second and second columns having a polarity of one of a positive polarity and a negative polarity. The method of claim 7, wherein Different ones of the first and second subpixels are disposed in 2m-1 and 2m columns of the 2n + 1 row, respectively, and different ones of the third and fourth subpixels in the 2m-1 and 2m columns of the 2n + 2 row, respectively. Each one is arranged to form a fifth pixel, Different ones of the third and fourth sub-pixels are disposed in the 2m + 1 and 2m + 2 columns of the second n + 1 row, respectively, and the first and second columns of the 2m + 1 and 2m + 2 columns of the second n + 2 row are disposed. Different ones of the two sub-pixels are arranged to form a sixth pixel, Different ones of the third and fourth subpixels are disposed in 2m + 3 and 2m + 4 columns of the second n + 1 row, respectively, and the first and second columns of 2m + 3 and 2m + 4 columns of the second n + 2 row are disposed. Different ones of the two sub-pixels are arranged to form a seventh pixel, Different ones of the first and second sub-pixels are disposed in the 2m + 5 and 2m + 6 columns of the second n + 1 row, respectively, and the third and the second, respectively in the 2m + 5 and 2m + 6 columns of the second n + 2 row. Different ones of the four sub-pixels are arranged to form an eighth pixel, The first, second, third, fourth, fifth, sixth, seventh, eighth pixels are repeatedly arranged in the column and row directions, The sub-pixels arranged in rows 2n-1 and 2n of one of the columns 2m-1, 2m, 2m + 1, 2m + 2, 2m + 3, 2m + 4, 2m + 5, and 2m + 6 Has a polarity of one of a positive polarity and a negative polarity, and the sub-pixels arranged in the second n + 1 and 2n + 2 rows are the other of the positive polarity and the negative polarity. Liquid crystal display device having a polarity of. The method of claim 10, The sub-pixels arranged in the second m-1, 2m + 2, 2m + 3, and 2m + 6 columns of one of the 2n-1, 2n, 2n + 1, and 2n + 2 rows are positive (+) polarities. The sub-pixels having polarity of one of a polarity and a negative polarity, and arranged in the second, second, second, second and second columns of the second and second polarities, respectively, are positive and negative polarities. Liquid crystal display device having a polarity. The method of claim 7, wherein And the first, second, third and fourth colors are different from among red, green, blue and white colors.