JP2003114655A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent display unevenness which appears when specific patterns are displayed in the liquid crystal display device of a dot inversion driving system. SOLUTION: In the liquid crystal display device of the dot inversion driving system inverting polarities of voltages which are applied to picture element area with respect to the voltage of a common electrode at every gate electrode line and for every source electrode line, the order of colors in a pixel in which three colors of R, G, B are made to be a pair is cyclically changed at every pixel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device which realizes prevention of display unevenness due to deviation of a common electrode voltage in a dot inversion drive system.

[0002]

2. Description of the Related Art In a transmissive liquid crystal display device, an electric field is applied to liquid crystal injected between substrates, and the alignment direction of liquid crystal molecules is controlled according to the strength of the electric field to adjust the amount of light transmitted through the substrate. is doing. This makes it possible to obtain an image with a desired brightness. Here, as a means for applying an electric field to the liquid crystal, an active matrix type liquid crystal display device using a thin film transistor (TFT) has been conventionally developed.
FIG. 9 is a schematic view of a TFT array substrate and a counter substrate in a conventional liquid crystal display device 100 (FIG. 9A), and T.
FIG. 9 shows a circuit configuration diagram (FIG. 9B) for applying a voltage to the liquid crystal in the picture element region of the FT substrate. A TFT array substrate 101 and a counter substrate 1 which are a pair of substrates facing each other.
In the TFT array substrate 101 out of 02, the gate electrode line 1
03, the gate electrode 104 connected to it, the source electrode line 105, and the source electrode 106 and the drain electrode 107 connected to it. On the other hand, a common electrode 108 is formed on the other substrate (counter substrate 102).
A color filter layer is formed in a matrix on the counter substrate so as to face the picture element region 109 surrounded by these electrode lines. The liquid crystal layer 1 is formed by the potential difference between the transparent pixel electrode 110 arranged in the pixel region 109 and the common electrode 108.
An electric field is applied to 11 to adjust the brightness of the liquid crystal display device 100.

Next, the operation of the pixel voltage will be described with reference to FIG. When a positive pulse equal to or higher than the threshold voltage of the TFT is applied to the gate electrode 104, the TFT is turned on (the source electrode 106 and the drain electrode 107 are in a conductive state). Therefore, the signal voltage 114 ( The source voltage) is sent to the pixel electrode 110. At this time,
As shown in FIG. 10, the pixel voltage 112 rises in synchronization with the gate pulse (gate electrode voltage) 113, and the voltage value at the time when the gate pulse 113 is turned off is maintained by the function of the storage capacitor (not shown). . Strictly speaking, however, the level shift of ΔV is caused by the influence of the parasitic capacitance Cgd (not shown) between the gate and the drain. The method of applying the pixel voltage 112 held at such a constant voltage for each frame employs the frame inversion drive in which the polarity of the pixel voltage 112 is inverted for each frame in order to prevent deterioration of the liquid crystal. . That is, the polarities of the pixel electrodes with respect to the common voltage are inverted every period (one frame) in which all the gate electrode lines are sequentially selected from top to bottom (FIG. 10).

In addition to frame inversion, dot inversion drive for inverting the polarity of a pixel voltage may be used for each gate electrode line and each source electrode line. This allows
It is possible to cancel the fluctuation of the mutual voltage for each picture element caused by the coupling capacitance between the common electrode and the picture element electrode.

[0005]

However, in the above dot inversion driving, unexpected stripe-shaped display unevenness was observed in the halftone region depending on the driving condition (a certain kind of display pattern). The inventor of the present application, as described below, examined the cause of the stripe-shaped display unevenness in the halftone region, and then conducted a confirmation experiment for the cause.

[Study of Generation Factor] In the dot inversion drive, the polarity pattern of each picture element is such that the polarity is inverted for each row line and each column line as shown in FIG. 11B. Here, the symbol (+) indicates that a positive voltage is applied to the pixel electrode 110 with reference to the voltage of the common electrode 108, and the symbol (−) indicates that a negative voltage is applied. By doing so, it is possible to cancel the fluctuation of the voltage between the picture element electrodes 110. on the other hand,
The light transmittance of the picture element region 109 is governed by the absolute value of the potential difference (voltage) between the picture element electrode and the common electrode. For example, in normally white mode liquid crystal driving, the light transmittance changes depending on the potential difference between the pixel electrode voltage and the common electrode voltage as shown in FIG. Therefore, as the potential difference increases, the light transmittance of the picture element decreases, and the display of the picture element shifts from the white display area to the black display side through the halftone area. That is, the absolute value of the potential difference between the pixel electrode and the common electrode is important for controlling the light transmittance regardless of whether the polarity is (+) or (-), and this is affected by the display pattern. It was generally considered impossible.

However, when the dot inversion drive is adopted, depending on a specific display pattern (particularly a color display pattern), there is a concern that the common electrode voltage may be affected as described below, which causes fluctuations in light transmittance. The inventor of the present application conjectured that there is a possibility that display unevenness may occur.

Focusing on the pixel voltage (signal voltage) for each row line (gate electrode line), the polarity average value (center voltage (virtual zero) It can be seen that the average value) with respect to the electric potential) does not become zero, but always shifts to the (+) polarity or the (−) polarity.

Here, as a display pattern condition, the deviation of the polarity average value of the signal voltage for each line is (+) with respect to the common electrode voltage 115 (Vcom) as shown in FIG.
Assume a situation in which the polarities and (-) polarities are repeated in a biased manner. Assuming this, in synchronization with the deviation of the average polarity of the signal voltage,
Considering that the common electrode voltage value shifts in the same direction as the polarity shift (FIG. 13), it is possible to theoretically explain the phenomenon of stripe-shaped display unevenness observed in the halftone region. Specifically, regarding the (+) polarity shift of the first row line of FIG. 13, the display condition signal of the (+) polarity shift is in the left half of the first row line, and the half tone display condition of the half tone display condition is in the right half thereof. A signal is given (FIG. 14A), and regarding the (−) polarity shift of the second row line in FIG. 13, the display condition signal of the (−) polarity shift is displayed on the right half of the left half of the second row line. Assume a situation in which half-tone display signals are given in half (FIG. 14B). According to such an assumption, in the first line, the common electrode voltage Vcom becomes the plus side voltage Vcom due to the deviation of the (+) polarity side of the polarity average value of the signal voltage.
1 and the common electrode voltage V on the second row line due to the deviation of the polarity average value of the signal voltage on the (−) polarity side.
com shifts to the negative voltage Vcom2. As a result, both the first line and the second line,
In these halftone regions (right half), the uniformity of the voltage difference between the signal voltage and the common electrode voltage is lost, causing the difference between the pixel regions and causing stripe-shaped display unevenness in the halftone regions. It is considered to be a thing.

From the above consideration, it was determined that the line-to-line variation of the common electrode voltage caused by the polarity deviation of the polarity average value of the signal voltage is the cause of the stripe-shaped display unevenness in the halftone region.

[Confirmation Experiment] In order to confirm whether or not the display unevenness can be visually recognized due to the variation of the common electrode voltage, the following confirmation experiment was conducted. The color filter is shown in Figure 1.
The striped R (red filter layer), G (green filter layer), and B (blue filter layer) picture elements shown in 1 (a) were periodically arranged. Further, since the polarity pattern is dot inversion drive, the polarity is inverted for each line and each pixel as shown in FIG. As the gradation display and screen display color evaluated in the experiment, a stripe pattern of "green-magenta-green-magenta-green -..." is displayed on the left half of the screen, and a uniform halftone is displayed on the right half. (Fig. 11
(C)). If black and white are repeatedly displayed for each column line using the color filter shown in FIG.
A green / magenta stripe pattern (Fig. 11
(C)).

Under the above conditions, XGA (1078 × 76
The display device of 8) was used to evaluate the display unevenness. In addition, the size of the window of the stripe display of "green-magenta-green-magenta-green -..." Was set to two types.

A: (0001, 0001) to (768,
576) B: (0001, 0001) to (256, 576) ((0001 to 768,> 576) is a halftone display)

In the above two types of display screens, a stripe display of "green-magenta-green-magenta-green -..." is displayed on the left half and a uniform halftone is displayed on the right half. "Green-magenta-green-magenta-green -..." of the striped display unevenness could be confirmed. Further, when the display unevenness generated in the halftone display of the display screens A and B is compared, the display unevenness generated in the halftone display area of A can be remarkably confirmed as compared with B.

It is considered that this is because when the stripe display area is enlarged, the area in which the fluctuation of the signal voltage affects the common electrode voltage increases, and the halftone area is caused by the fluctuation of the common electrode voltage line by line. This is a strong indirect proof that proves the hypothesis that the stripe-shaped display unevenness occurs.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a liquid crystal display device of a dot inversion drive system which can suppress the fluctuation of the common electrode voltage and prevent the occurrence of display unevenness. Especially.

[0017]

A liquid crystal display device according to the present invention comprises a plurality of gate electrode lines formed on a substrate, a plurality of source electrode lines intersecting with the gate electrode lines, the gate electrode lines and the sources. A liquid crystal including an array substrate having a picture element region surrounded by electrode lines, and a counter substrate having a filter layer arranged in a matrix shape so as to sandwich the liquid crystal with the array substrate and face the picture element region. A display device, which uses dot inversion drive for inverting the polarity of the voltage applied to the pixel region for each of the gate electrode line and the source electrode line with respect to the voltage of a common electrode, and further to the counter substrate. Is a plurality of pixels formed of three filter layers in which a red filter layer, a green filter layer and a blue filter layer are arranged in series along the gate electrode line. The red is the order of the arrangement of the green and blue filter layer that is changed for each of the pixels.

The arrangement of the filter layers connected along the gate electrode line is as follows: a first pixel composed of red, green and blue filter layers, a second pixel composed of green, blue and red filter layers, and blue, The third pixel composed of the red and green filter layers is continuously arranged in this order.

The array of the filter layers connected along the source electrode line is repeatedly arranged in the order of red, green and blue filter layers.

A liquid crystal display device according to the present invention is surrounded by a plurality of gate electrode lines formed on a substrate, a plurality of source electrode lines intersecting with the gate electrode lines, and the gate electrode lines and the source electrode lines. A liquid crystal display device comprising: an array substrate having a picture element region; and a counter substrate having a filter layer arranged in a matrix so as to sandwich the liquid crystal together with the array substrate and face the picture element region, The pixel regions form one pixel region with three colors of red, green, and blue as one set in the gate electrode line direction, and the polarity of the voltage applied to each pixel region is set with respect to the voltage of the common electrode. Dot inversion drive is used in which each gate electrode line is inverted and each source electrode line group consisting of two continuous source electrode lines is inverted, thereby suppressing variation in the common electrode voltage.

A liquid crystal display device according to the present invention is surrounded by a plurality of gate electrode lines formed on a substrate, a plurality of source electrode lines intersecting the gate electrode lines, and the gate electrode lines and the source electrode lines. A liquid crystal display device comprising: an array substrate having a picture element region; and a counter substrate having a filter layer arranged in a matrix so as to sandwich the liquid crystal together with the array substrate and face the picture element region, Dot inversion drive is used in which the polarity of the voltage applied to the pixel region is inverted with respect to the voltage of the common electrode for each gate electrode line group consisting of two consecutive gate electrode lines. It suppresses fluctuations in voltage.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

Embodiment 1 From the use environment of the liquid crystal display panel and other external factors,
A specific color display pattern such as "green-magenta-green-magenta -..." May be continuously displayed. In such a case, as pointed out above, the variation of the common electrode voltage caused by the specific display pattern may cause a non-negligible level of display unevenness. Therefore, the inventor of the present application has devised a method of associating a specific display pattern with an array of color filters to prevent fluctuations in the common electrode voltage. Here, the stripe display pattern of "green-magenta-green-magenta -..." will be taken as an example to explain how the color filter arrangement that conforms to this display pattern and in which display unevenness is less likely to occur is determined.

Of course, no matter what the color filter array is, there should be some kind of color display pattern that induces display unevenness. However, if the color filter array is complicated, a color display pattern that causes display unevenness will also occur. Since the display becomes complicated and the continuous use of such a display is rare, it is almost impossible to reveal the display unevenness as a practical problem.

Hereinafter, "green-magenta-green-magenta ..."
The structure for preventing display unevenness that occurs in the stripe display pattern will be described in detail with reference to the drawings.

FIG. 1A schematically shows an arrangement of color filter layers for each line of the liquid crystal display device in the first embodiment. Here, the minimum divisional areas indicated by the reference signs R, G, and B indicate "one picture element" areas, and these areas are respectively represented by a red (R) filter layer, a green (G) filter layer, and Alternatively, a blue (B) filter layer is formed. FIG. 1B shows the polarities of the voltages applied to the respective picture elements of the color filter layer in FIG. 1A.
Here, the initial arrangement of R, G, and B is arbitrary, but for convenience sake, this will be described below as RGB. The sign (+) is
The positive polarity that applies a positive voltage to the common electrode voltage Vcom is shown, and the symbol (-) shows the negative polarity that a negative voltage is applied to the common electrode voltage Vcom. Since the dot inversion drive method is adopted as the liquid crystal drive method, the polarity is inverted line by line and pixel by pixel.

The feature of the first embodiment is that when an area in which three picture element areas are connected is defined as "one pixel" and the minimum display unit is used, an array of color filters consisting of three picture element areas in one pixel is used. , "R-G-B" (first pixel), "G-B-R" instead of the conventional simple repetition of "R-G-B"
(Second pixel), “B-R-G” (third pixel), and so on. That is,
In the conventional example, the arrangement cycle of the color filter layers at the same position in one pixel and the same color is three picture element area lengths, but in the first embodiment, the arrangement cycle is extended to nine picture element area lengths. There is.

Next, the effect of improving the variation of the common electrode voltage by this color filter array will be described with reference to FIGS. 1 and 2.

In the upper part of FIG. 1 (c), a stripe display of "green-magenta-green-magenta-green ..." Is displayed for each pixel for the color filter array having a long period of nine picture element regions shown in FIG. 1 (a). In this case, which of the “black” display and the “white” display should be selected for the three picture elements in each pixel is illustrated. That is, "black" display indicates a state in which light is blocked from the pixel area, and "white" display indicates a state in which light is transmitted to the pixel area. . The lower part of FIG. 1C shows the display color displayed by each pixel. For example, the pixel in the second column has 3
Since light is transmitted through the blue filter layer and the red filter layer of one picture element region, a magenta color in which blue and red are mixed is displayed.

In the first embodiment, since the driving is performed in the normally white mode, the voltage difference between the common electrode and the pixel electrode is large in "black" display and small in "white" display. Further, as described above, a positive voltage of the sign (+) applies a positive voltage to the common electrode voltage Vcom, and a negative voltage of the sign (−) applies a negative voltage.

When the gray scale display of the upper stage of FIG. 1C is performed with the polarity of the first line of FIG. 1B, the entire first row line is common as shown in FIG. 2A. Electrode voltage V
The signal voltages with respect to com (dotted line in the figure) are applied substantially evenly so as not to be biased to a positive voltage or a negative voltage. That is, the positive voltage and the negative voltage of the signal voltage are canceled each other and the voltage shift of the signal voltage is hard to occur, that is, the average value of the polarities of the signal voltage in the entire line is almost equal to zero, which causes the fluctuation of the common electrode voltage. Can be improved. In addition, similarly for the second row line, as shown in FIG. 2B, it can be seen that the plus voltage and the minus voltage of the signal voltage cancel each other. Therefore, if the color filter having a long period of 9 picture element regions shown in FIG. 1A is adopted, the common electrode voltage Vco is displayed for the stripe display of "green-magenta-green-magenta-green ...".
It is possible to prevent the fluctuation of m in advance and eliminate the root cause of uneven display of halftone.

Second Embodiment In the first embodiment, a color filter array consisting of three picture element regions in a pixel is arranged along the gate line with “R”.
-G-B "(first pixel)," G-B-R "(second pixel)," B-R-G "(third pixel) are changed to a cyclic repeating array, and the array cycle (of the same color) The period in which the color filter layers are arranged at the same position in the pixel) was extended to the length of 9 pixel regions, but a stripe array configuration was adopted in which the pixels of the same color were arrayed along the source electrode line. . On the other hand, in the second embodiment, in addition to extending the array along the gate line to the length of 9 pixel regions, the array of adjacent pixels in the source electrode line direction also has “R-
It is characterized in that it is changed to a cyclic repeating arrangement of "GB". FIG. 3A schematically shows the color filter layer arrangement for each line of the liquid crystal display device in the second embodiment.

The effect of improving the variation of the common electrode voltage by the color filter at this time will be described with reference to FIGS. 3 and 4.

In the upper part of FIG. 3 (c), "green-magenta-green-magenta-green-magenta -..." for each pixel with respect to the color filter array having a long period of 9 picture element regions shown in FIG. 3 (a). "
The gradation display color in the case of performing the stripe display is shown. In the second embodiment as well, since the driving is performed in the normally white mode, the voltage difference between the common electrode and the pixel electrode is large in "black" display, and small in "white" display. The same as 1.

When the gray scale display of FIG. 3 (c) is performed with the polarity of FIG. 3 (b), as shown in FIGS. 4 (a) to 4 (c), the common electrode is seen in the entire row line. Each signal voltage with respect to the voltage Vcom is applied substantially evenly so as not to be biased to a plus voltage or a minus voltage. Here, in the first embodiment, the regularity of the signal voltage that the same voltage pattern is repeated every two lines is maintained, but in the second embodiment, the pattern change cycle of the signal voltage for each line is It is possible to extend and more reliably eliminate the root cause of halftone display unevenness.

Third Embodiment A feature of the third embodiment is that the number of polarity inversions in each line is reduced. By doing so, the common electrode voltage Vc can be obtained without changing the arrangement of the filter layers of the color filter.
The fluctuation of om can be improved. The operation will be described below with reference to FIGS. 5 and 6. Since the gradation display and screen display color in FIG. 5 are the same as those of the conventional example, detailed description thereof will be omitted.

FIG. 5 (a) schematically shows a color filter array for each line of the liquid crystal display device. As in the conventional example, "R-G-B" is set as one pixel and is simply repeated. Has been adopted. FIG. 5B shows a pattern of the polarity of the signal voltage applied to each picture element region, and the polarity is inverted every two picture element regions in each row line.
It uses a dot inversion drive system.

When the gradation display of FIG. 5C is performed with the polarity of the first row line of FIG. 5B, the common electrode voltage Vcom on the first row line is as shown in FIG. 6A.
It can be seen that the respective signal voltages with respect to are applied substantially uniformly so as not to be biased to the positive voltage or the negative voltage. Similarly, as shown in FIG. 6B, the positive voltage and the negative voltage of the signal voltage are canceled out with respect to the second row line, and the voltage shift of the common electrode voltage Vcom due to the signal voltage hardly occurs.

In the third embodiment, 2 lines are provided for each row line.
Although the 2-dot inversion driving method of inverting the polarity for each pixel area is adopted, the same effect can be obtained by using the inversion driving method of inverting the polarity for each even pixel area in each row line.

As described above, 2 shown in FIG.
If the dot inversion driving method is adopted, the common electrode voltage Vc can be applied to the stripe display of "green-magenta-green-magenta-green -..." Without changing the arrangement of the color filters.
It is possible to prevent fluctuations in om and eliminate the root cause of uneven display of halftones.

Fourth Embodiment A feature of the fourth embodiment is that the number of polarity inversions in each column line (source electrode line) is reduced in order to suppress the variation of the common electrode voltage. By doing so, the variation of the common electrode voltage Vcom can be improved based on another viewpoint different from the effect of suppressing the deviation of the polarity average value of the signal voltage for each line (Embodiments 1 to 3). Hereinafter, FIG. 7 and FIG.
The operation of the fourth embodiment will be described using. Note that FIG.
Medium gradation display (Fig. 7 (c)) and screen display color (Fig. 7)
Since (d) is the same as the configuration of the conventional example, detailed description thereof will be omitted.

FIG. 7A schematically shows a color filter array for each line of the liquid crystal display device, and like the conventional example, "R-G-B" is set as one pixel and is simply repeated. Has been adopted. At this time, when a stripe pattern of "green-magenta-green-magenta-green ..." As a specific display pattern is displayed, a pattern of the polarity of the signal voltage applied to each pixel region is shown in FIG. 7 (b). In addition to inverting the common electrode voltage for each column line,
A 1 × 2 dot inversion drive method is used in which every two continuous row lines are inverted.

In such a driving method, considering the change of the average value of the polarities of the signal voltage, as described above, the first
In the row line and the second row line, since black display (that is, when the voltage difference between the signal voltage and the common electrode voltage is large) is driven with the (+) polarity, the average polarity value shifts to the positive voltage side. To do. On the other hand, in the third row line and the fourth row line, since the black display is driven with the (-) polarity, the average polarity value shifts to the negative voltage side. FIG. 8 schematically shows changes in the shift of the average polarity value and changes in the common electrode voltage due to the changes.

Here, the influence of the shift of the average polarity value on the common electrode voltage Vcom will be considered. Common electrode voltage Vco
m is displaced in the same voltage direction as the polarity average value shift of the signal voltage, and it is possible to secure enough time to recover with the passage of time, and the voltage value actually applied to the common electrode It is considered to approach asymptotically.

Therefore, with respect to the shift of the polarity average value of the signal voltage as shown in FIG. 8, the common electrode voltage Vcom largely changes to the plus voltage side at the start point of the first row line selection, and then the second row. The amount of fluctuation decreases as time passes until the end of line selection. After that, after largely changing to the negative voltage side at the start point of the third row line selection, the variation amount decreases with the passage of time until the end point of the fourth row line selection. After that, these operations are repeated.

From this, at least for the second row line and the fourth row line, the variation amount of the common electrode voltage is
It has been sufficiently reduced to a level that does not affect the display,
As a result, it is possible to improve the halftone display unevenness on the second row line and the fourth row line.

Further, in the fourth embodiment, the polarity pattern of the signal voltage applied to each picture element region is inverted every two consecutive row lines with respect to the common electrode voltage, but three or more consecutive ones are arranged. Even if a driving method in which the polarity is inverted for each row line is adopted, the same effect can be obtained.

[0048]

According to the first and second aspects of the invention, the dot inversion drive is performed in which the polarity of the voltage applied to the pixel region is inverted with respect to the voltage of the common electrode for each gate electrode line and source electrode line. Further, a plurality of pixels each composed of three filter layers in which a red filter layer, a green filter layer, and a blue filter layer are arranged in series along the gate electrode line are formed on the counter substrate. By changing the order of arranging the red, green, and blue filter layers for each pixel, it is possible to prevent fluctuations in the common electrode voltage that are caused when a specific display pattern is displayed on the screen, and to prevent uneven halftone display. A liquid crystal display device that can eliminate the root cause was obtained.

According to the invention of claim 3, claim 1,
In addition to the configuration of 2, the filter layers arranged along the source electrode line are repeatedly arranged in the order of red, green, and blue filter layers, so that a common electrode provided when a specific display pattern is displayed on the screen. A liquid crystal display device that can prevent voltage fluctuations and eliminate the root cause of halftone display unevenness has been obtained.

According to the fourth aspect of the invention, the pixel region is formed in the direction of the gate electrode line with one set of three colors of red, green and blue to form one pixel region, and the voltage applied to each pixel region is formed. The dot inversion drive that inverts the polarity of each of the source electrode line groups consisting of two continuous source electrode lines with respect to the voltage of the common electrode is used, which makes it possible to suppress variations in the common electrode voltage. Therefore, it is possible to obtain a liquid crystal display device capable of preventing the fluctuation of the common electrode voltage which is caused when a specific display pattern is displayed on the screen, and eliminating the root cause of the halftone display unevenness.

According to the fifth aspect of the invention, the polarity of the voltage applied to the pixel region is reversed for each source electrode line with respect to the voltage of the common electrode voltage, and continuous 2
The dot inversion drive that inverts each gate electrode line group consisting of two gate electrode lines is used, the number of changes in the shift of the average polarity value of the signal voltage can be reduced, and the variation of the common electrode voltage can be sufficiently restored. A liquid crystal display device is obtained in which the charging time can be secured, and by this, the fluctuation of the common electrode voltage caused when a specific display pattern is displayed on the screen can be improved and the halftone display unevenness can be mitigated.

[Brief description of drawings]

FIG. 1 is a diagram showing an arrangement of filter layers, a polarity of a signal voltage and green, and a gradation display and a screen display color when a magenta stripe is displayed in a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a variation in signal voltage when displaying a green and magenta stripe on the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an arrangement of filter layers, polarity of signal voltage and green, and gradation display and screen display color when a magenta stripe is displayed in the liquid crystal display device according to the second embodiment of the present invention.

FIG. 4 is a diagram showing changes in signal voltage when displaying a green and magenta stripe on the liquid crystal display device according to the second embodiment of the present invention.

FIG. 5 is a diagram showing an arrangement of filter layers, polarity of signal voltage and green, and gradation display and screen display color when a magenta stripe is displayed in a liquid crystal display device according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a change in voltage when green and magenta stripes are displayed on the liquid crystal display device according to the third embodiment of the present invention.

FIG. 7 is a diagram showing an arrangement of filter layers, polarity of signal voltage and green, and gradation display and screen display color when a magenta stripe is displayed in a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 8 is a diagram showing fluctuations in a polarity average value of a signal voltage and a common electrode voltage for each line of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 9 is a schematic view of a conventional TFT array substrate and a counter substrate,
FIG. 3 is a circuit configuration diagram of a pixel area in a TFT array substrate area.

FIG. 10 is a diagram showing voltage fluctuations in respective portions of a conventional liquid crystal display device.

FIG. 11 is a diagram showing an arrangement of filter layers, polarity of signal voltage and green, and gradation display and screen display color when a magenta stripe is displayed in a conventional liquid crystal display device.

FIG. 12 is a diagram showing a relationship between gradation display and transmittance of a conventional liquid crystal display device.

FIG. 13 is a diagram showing variations in signal voltage and common electrode voltage for each line of a conventional liquid crystal display device.

14 is a diagram showing a change in signal voltage of the liquid crystal display device in FIG.

[Explanation of symbols]

100 liquid crystal display 101 TFT array substrate 102 counter substrate 103 Gate electrode line 104 gate electrode 105 Source electrode wire 106 source electrode 107 drain electrode 108 common electrode 109 picture element area 110 picture element electrode 111 Liquid crystal layer 112 Picture element voltage 113 gate pulse 114 signal voltage 115 Common electrode voltage R Red filter layer G Green filter layer B Blue filter layer

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Claims (5)

[Claims] 1. A plurality of gate electrode lines formed on a substrate, a plurality of source electrode lines intersecting with the gate electrode lines,
An array substrate having a picture element region surrounded by the gate electrode lines and the source electrode lines, and a liquid crystal sandwiched between the array substrate and a filter layer arranged in a matrix shape facing the picture element region. A liquid crystal display device including a counter substrate, wherein dot inversion drive is used to invert the polarity of the voltage applied to the pixel region with respect to the voltage of a common electrode for each of the gate electrode line and the source electrode line. Cage,
Further, a plurality of pixels each including a red filter layer, a green filter layer, and a blue filter layer, which are three filter layers in which the red filter layer, the green filter layer, and the blue filter layer are arranged in series along the gate electrode line, are formed on the counter substrate. A liquid crystal display device, wherein the arrangement order of the green and blue filter layers is changed for each pixel. 2. The arrangement of the filter layers connected along the gate electrode line is a first pixel composed of red, green, and blue filter layers, a second pixel composed of green, blue, and red filter layers, and blue, 2. The liquid crystal display device according to claim 1, wherein the third pixels composed of red and green filter layers are continuously arranged in this order. 3. The red, green, and blue filter layers are repeatedly arranged in the order of the array of the filter layers connected along the source electrode line.
The described liquid crystal display device. 4. A plurality of gate electrode lines formed on a substrate, a plurality of source electrode lines intersecting with the gate electrode lines,
An array substrate having a picture element region surrounded by the gate electrode lines and the source electrode lines, and a liquid crystal sandwiched between the array substrate and a filter layer arranged in a matrix shape facing the picture element region. A liquid crystal display device comprising a counter substrate, wherein the picture element areas form one pixel area in the direction of the gate electrode line with a set of three colors of red, green and blue, and are applied to each picture element area. The dot inversion drive is used in which the polarity of the voltage is inverted for each gate electrode line with respect to the voltage of the common electrode, and is inverted for each source electrode line group including two continuous source electrode lines. A liquid crystal display device, characterized in that a variation in common electrode voltage is suppressed. 5. A plurality of gate electrode lines formed on a substrate, a plurality of source electrode lines intersecting with the gate electrode lines,
An array substrate having a picture element region surrounded by the gate electrode lines and the source electrode lines, and a liquid crystal sandwiched between the array substrate and a filter layer arranged in a matrix shape facing the picture element region. A liquid crystal display device including a counter substrate, wherein a polarity of a voltage applied to the pixel region is inverted with respect to a voltage of a common electrode for each gate electrode line group including two continuous gate electrode lines. A liquid crystal display device characterized by using a dot inversion drive for suppressing the fluctuation of the common electrode voltage.