JPH09185081A - LCD panel - Google Patents

Abstract

There is provided a liquid crystal display panel having a new structure capable of suppressing the occurrence of reverse tilt due to the influence of a lateral electric field in the vicinity of a drive wiring. SOLUTION: The first and second substrates arranged to face each other,
Drive wiring formed in a grid pattern on the facing surface of the first substrate, the drive wiring including a plurality of signal lines extending in the column direction and a plurality of control lines extending in the row direction; Pixel electrodes formed on the opposite surface of the substrate in a region that does not overlap with the drive wiring at each of the intersections of the signal lines and the control lines, and the pixel electrodes are adjacent to each other. In a pixel electrode arranged in a row between two signal lines, a pixel electrode whose shortest distance between each pixel electrode and each of the two signal lines sandwiching the pixel electrode monotonously changes in the column direction, and a pixel electrode A switching element formed for each of the substrates, a common electrode formed on the opposite surface of the second substrate, and a liquid crystal layer sandwiched between the first and second substrates.

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 panel, and more particularly to an active matrix type liquid crystal display panel which controls a voltage of a pixel electrode by using a switching element arranged corresponding to a pixel.

[0002]

2. Description of the Related Art In an active matrix type liquid crystal display panel, a lateral electric field having a component parallel to a substrate surface is generated between a driving wiring for driving a switching element and a pixel electrode. Liquid crystal molecules affected by the lateral electric field rise so that their long axes are parallel to the direction of the lateral electric field.
There is no problem if the rising direction matches the pretilt direction of the region. However, if the rising direction does not match, the reverse tilt phenomenon in which the liquid crystal molecules near the drive wiring rise in the direction opposite to the pretilt direction is likely to occur.

Conventionally, in order to prevent the occurrence of reverse tilt,
A method of increasing the pretilt angle and a method of increasing the distance between the drive wiring and the pixel electrode to weaken the lateral electric field are used.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display panel having a new structure capable of suppressing the occurrence of reverse tilt due to the influence of the lateral electric field near the drive wiring.

[0005]

According to one aspect of the present invention, first and second substrates are arranged facing each other with a gap, and are formed in a lattice pattern on the facing surface of the first substrate. Drive wiring, which is composed of a plurality of signal lines extending in the column direction and a plurality of control lines extending in the row direction, and the drive wiring on the facing surface of the first substrate. Pixel electrodes formed corresponding to each of the intersections of the signal lines and the control lines in a region that does not overlap with, and between two signal lines adjacent to each other of the pixel electrodes. In the pixel electrodes arranged in a line, each pixel electrode is sandwiched by 2
Signal of one of the two signal lines sandwiching the pixel electrode and the pixel electrode formed for each pixel electrode whose shortest distance from each of the two signal lines monotonously changes in the column direction. A switching element that is connected to a line and is controlled by one control line of the plurality of control lines; a common electrode formed on the facing surface of the second substrate;
And a liquid crystal layer sandwiched between the second substrates.

When the distance between the pixel electrode and the signal line adjacent thereto is increased, the lateral electric field generated between the pixel electrode and the signal line can be weakened. In a region where the average potential difference between the pixel electrode and the signal line is large, the lateral electric field can be effectively weakened by increasing the distance between them.

According to another aspect of the present invention, a scanning signal for scanning the control line from one end to the other end in the column direction is applied to the control line during one frame scanning period, and Scanning signal applying means for sequentially bringing the switching elements into a conductive state, and image signal applying means for applying an image signal to the signal line in synchronization with the scanning signal applied by the scanning signal applying means. The image signal applying means for applying an image signal so that the positive and negative of the voltage applied to each signal line is reversed for each frame, and the voltages applied to mutually adjacent signal lines are in opposite phases. ,
In the pixel electrodes arranged in a line between two signal lines adjacent to each other among the pixel electrodes, each pixel electrode and two signal lines sandwiching the pixel electrode are connected via the switching element. The shortest distance to the signal line is monotonically increasing from the one end to the other end in the column direction, and the shortest distance to the other signal line of the two signal lines is the column direction. A liquid crystal display panel that monotonically decreases from the one end to the other end is provided.

The liquid crystal display panel is driven so that the positive / negative of the voltage applied to each signal line is reversed every frame and the voltages applied to the mutually adjacent signal lines have opposite phases. When driven by this method, the voltage of the pixel electrode and the signal line corresponding thereto have the same sign and the voltage of the other signal line adjacent to the pixel electrode has a different sign in the pixel which has finished scanning. This is the reverse relationship for pixels that have not finished scanning.

In the pixel on the scanning start side, the average potential difference between the pixel electrode and the corresponding signal line is relatively small as compared with the pixel on the scanning end side, and the average potential difference between the other signal line and the pixel electrode. Is relatively large. Since the distance between the pixel electrode and the signal line is increased in the region where the average potential difference increases, the lateral electric field can be weakened.

According to another aspect of the present invention, a scanning signal for scanning the control line from one end to the other end in the column direction is applied to the control line during one frame scanning period, and Scanning signal applying means for sequentially bringing the switching elements into a conductive state, and image signal applying means for applying an image signal to the signal line in synchronization with the scanning signal applied by the scanning signal applying means. The image signal applying means for applying an image signal so that the positive and negative of the voltage applied to each signal line is reversed for each frame, and the voltages applied to all the signal lines are in phase. Among the electrodes, in a pixel electrode arranged in a line between two signal lines adjacent to each other, the shortest distance between each pixel electrode and each of the two signal lines sandwiching the pixel electrode is in the column direction. , Both of the above The liquid crystal display panel is provided which monotonically increases toward the other end from the end.

The liquid crystal display panel is driven such that the positive / negative of the voltage applied to each signal line is reversed every frame and the voltages applied to all the signal lines are in phase. When driven by this method, the voltages of the pixel electrode and the signal lines on both sides of the pixel have the same sign in the pixels that have completed scanning, and have different signs in the pixels that have not completed scanning.

In the pixel on the scanning end side, the average potential difference between the pixel electrode and the signal lines on both sides of the pixel is relatively large as compared with the pixel on the scanning start side. Since the distance between the pixel electrode and the signal line is increased in the region where the average potential difference increases, the lateral electric field can be weakened.

According to another aspect of the present invention, in the vicinity of each edge of the pixel electrode, at least one of the four intersections of the drive wirings surrounding the pixel electrode has two drive wirings continuous with it. In the vicinity, a pretilt is given to the liquid crystal molecules on the side of the first substrate in a direction of rising from the end opposite to the drive wiring, and the pixel electrode is
There is provided a liquid crystal display panel having a shape of a parallelogram region having two pairs of sides parallel to the signal line and the control line, in which a vicinity of at least a vertex corresponding to the one intersection is cut out.

When liquid crystal molecules near the drive wiring are affected by the lateral electric field, they rise from the end portion on the drive wiring side. In the region where the pretilt is given in the opposite direction to this direction, the reverse tilt is likely to occur. Since the portion where the reverse tilt is likely to occur is cut out of each apex of the pixel electrode, the distance between the pixel electrode and the drive wiring becomes long at this portion, and the lateral electric field can be weakened.

According to another aspect of the present invention, there are provided first and second substrates which are opposed to each other with a gap therebetween, and drive wiring which is formed in a lattice pattern on the facing surface of the first substrate. , The drive wiring formed of a plurality of signal lines extending in the column direction and a plurality of control lines extending in the row direction, and in a region on the facing surface of the first substrate that does not overlap with the drive wiring. A pixel electrode formed corresponding to each intersection of the signal line and the control line to define a pixel; and the first and second pixel electrodes.
A color filter that is formed on at least one surface of the substrate and that transmits red light, green light, and blue light of any one color in each of the pixels; A switching element that connects the electrode and one of the two signal lines sandwiching the electrode, and is controlled by one control line of the plurality of control lines, and on the facing surface of the second substrate. A common electrode formed on the substrate, a liquid crystal layer sandwiched between the first and second substrates,
Formed on one of the facing surfaces of the first and second substrates,
A liquid crystal layer thickness adjusting means for adjusting the thickness of the liquid crystal layer so that the thickness of the liquid crystal layer in each pixel becomes thinner in the order of the red pixel, the green pixel, and the blue pixel. In the pixel electrodes arranged in one row, the shortest distance between the pixel electrode and each of the two signal lines that sandwich the pixel electrode is a red pixel that transmits red light, a green pixel that transmits green light and a blue pixel that transmits blue light. There is provided a liquid crystal display panel in which the pixel electrodes and the signal lines are arranged so that the blue pixels become shorter in order.

In order to give a suitable retardation value to each wavelength of the red, green and blue pixels, the thickness of the liquid crystal layer in each pixel is made different. If the liquid crystal layer is thick, the distance between the pixel electrode and the common electrode becomes long, so that a lateral electric field is easily generated. Since the distance between the pixel electrode and the signal line is set longer in the pixel in which the horizontal electric field is more likely to be generated, the horizontal electric field can be weakened.

According to another aspect of the present invention, in the pixel electrodes of the same color among the pixel electrodes arranged in a line between two signal lines adjacent to each other among the pixel electrodes,
Provided is a liquid crystal display panel in which the shortest distance between each pixel electrode and each of two signal lines sandwiching the pixel electrode changes monotonously in the column direction.

In a region where the average potential difference between the pixel electrode and the signal line is large, the lateral electric field can be effectively weakened by increasing the distance between them.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A liquid crystal display panel according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1A is a plan view showing the outline of a thin film transistor (TFT) side substrate of the liquid crystal display panel according to the first embodiment. Drain lines extending in the column direction of the diagram (signal _{lines) DL 1, DL 2, ...} , and FIG row direction extending gate lines (control _{line) GL 1, GL 2, ...} , GL 7,
GL ₈ , ... Are formed. The gate line GL and the drain line DL are insulated from each other at the intersection.

Pixel electrodes CE are formed in regions that do not overlap the gate lines and the drain lines, corresponding to the respective intersections of the gate lines GL and the drain lines DL. Each pixel electrode CE
Is a drain line DL adjacent to the left side in the drawing through a thin film transistor TR provided corresponding to each pixel electrode.
It is connected to the. The gate electrode of each thin film transistor TR is connected to the gate line GL adjacent to the upper side in the figure.

In the pixel electrode CE, among the parallelogrammic regions each having two pairs of sides parallel to the gate line GL and the drain line DL, the vertex portion corresponding to the region in which the thin film transistor TR is formed is chipped in a rectangular shape. Have a shape. When the shortest distance between the drain line DL adjacent to the left side and the pixel electrode CE and WL, shortest distance WL _i in the pixel electrode CE corresponding to the i-th gate line GL _i is, i-1 th gate line GL _{i It} is longer than or equal to the shortest distance WL _{i−1 at} the pixel electrode CE corresponding to ₋₁ .

Moreover, when the shortest distance between the drain line DL adjacent to the right side and the pixel electrode CE and WR, the shortest distance WR _i of the pixel electrode CE corresponding to the i-th gate line GL _i is, i-1 th Is shorter than or equal to the shortest distance WR _i-1 in the pixel electrode CE corresponding to the gate line GL _i-1 . That is, the shortest distance WL monotonically increases from the upper side to the lower side in the drawing in the column direction, and the shortest distance WR monotonically decreases.

For example, the shortest distances WL and WR at the uppermost pixel in the column direction are about 1 μm and about 20 μm, and the shortest distances WL and WR at the lowermost pixel are about 2 respectively.
The thickness is 0 μm and about 1 μm.

FIG. 1B is a dashed-dotted line B1 shown in FIG.
The cross-sectional view of the liquid crystal display panel corresponding to -B1 is shown. Gate electrode TG made of Cr, Al or the like on the surface of the transparent substrate 1.
And a gate insulating layer 12 made of SiN, alumina, or the like is formed so as to cover the gate electrode TG. A channel layer CH made of amorphous silicon is formed on the surface of the gate insulating layer 12 above the gate electrode TG.
A drain region TD and a source region TS made of Cr, Al or the like are formed on both sides thereof. On the surface of the gate insulating layer 12, the pixel electrode CE is formed continuously with the source region TS.

The thin film transistor TR is covered and protected by the TFT protective layer 13 made of SiN or the like. T
Alignment film 2 so as to cover FT protective layer 13 and pixel electrode CE
Are formed.

The transparent substrate 21 on the common electrode side is arranged so as to face the substrate on the TFT side. A black matrix 22 made of Cr or the like is formed in a region corresponding to the thin film transistor TR, the drain line DL, and the gate line GL on the opposing surface of the transparent substrate 21, and a color filter 23 is formed in a region corresponding to the pixel electrode CE. . Color filter 2
A common electrode 24 is formed on the entire surface so as to cover 3 and the black matrix 22, and an alignment film 25 is formed on the surface.

The alignment films 2 and 25 are subjected to an alignment treatment so that the in-plane alignment directions of the substrates differ from each other by 90 °.
Further, the alignment films 2 and 25 impart a pretilt to the liquid crystal molecules in the liquid crystal layer 30.

A liquid crystal layer 30 is sandwiched between the TFT substrate and the common electrode substrate. Polarizing plates 27 and 28 are arranged on the outer surfaces of the transparent substrates 1 and 21, respectively. When the polarizing plates 27 and 28 are arranged so that the polarization axis directions thereof are orthogonal to each other, a normally white mode that shows a white state when no voltage is applied is set, and when they are arranged parallel to each other, a black state is obtained when no voltage is applied. Indicates a normally black mode.

Next, a driving method of the liquid crystal display panel shown in FIG. 1 will be described with reference to FIG. In FIG. 2A, the states of the applied voltage at the time of scanning the odd-numbered frame are indicated by +/− signs.
A negative voltage is applied to the gate line GL corresponding to the pixel which is not being scanned, and the corresponding thin film transistor TR is in a non-conducting state. Gate line GL corresponding to the pixel to be scanned
Is applied with a positive voltage. During the scanning period of one frame, each pixel is scanned from the upper side to the lower side of the drawing. FIG. 2 (A)
Shows the state when scanning the pixels in the third row from the top.

An image signal corresponding to the pixel being scanned is applied to the drain line DL. At this time, a positive voltage corresponding to the image signal is applied to the odd-numbered drain lines DL,
A negative voltage corresponding to the image signal is applied to the even-numbered drain lines DL. In pixels that have already been scanned in the frame, that is, in pixels above the pixels that are being scanned, positive charges corresponding to image signals are applied to the pixel electrodes CE in the odd-numbered columns in the pixel electrodes CE in the even-numbered columns. Negative charges corresponding to the image signal are accumulated.

FIG. 2B shows a state of the applied voltage at the time of scanning an even number frame by + and-signs. In the gate line GL,
As in the case of scanning odd-numbered frames, a positive voltage is applied only to the gate line GL corresponding to the pixel being scanned. A negative voltage corresponding to the image signal is applied to the odd-numbered drain lines DL, and a positive voltage corresponding to the image signal is applied to the even-numbered drain lines DL. In this way, the positive / negative of the voltage applied to the drain line DL is reversed from that at the time of scanning the odd-numbered frame. Therefore, in the pixel which has already completed the scanning during the frame scanning period, the pixel electrodes C of the odd-numbered columns
Negative charges corresponding to the image signal are accumulated in E, and positive charges corresponding to the image signal are accumulated in the pixel electrodes CE of the even-numbered columns.

The electric charges accumulated during the scanning of the previous frame remain in the pixel electrode CE of the pixel which has not been scanned yet, that is, the pixel below the pixel which is being scanned. Therefore, in the pixels which have not been scanned during the odd-numbered frame scanning, as shown in FIG. 2A, the pixel electrodes CE in the odd-numbered columns are negatively charged and the pixel electrodes CE in the even-numbered columns are charged.
The positive charge is stored in. In addition, in the pixels which have not been scanned at the time of even-numbered frame scanning, FIG.
As shown in, the positive charges are accumulated in the pixel electrodes CE of the odd-numbered columns, and the negative charges are accumulated in the pixel electrodes CE of the even-numbered columns.

As shown in FIGS. 2A and 2B, in the pixels which have already been scanned, the voltage of each pixel electrode CE and the drain line DL on the left side thereof have the same sign, and each pixel electrode CE. And the drain line DL on the right side thereof have different signs. Therefore, the potential difference between each pixel electrode CE and the drain line DL on the right side thereof becomes large.

On the contrary, in the pixel where the scanning is not completed, the potential difference between each pixel electrode CE and the drain line DL on the left side becomes large. That is, the pixel on the scanning start side (the pixel on the upper side of the figure) of FIG. 2A is located between the pixel electrode CE and the drain line on the right side of the pixel on the scanning end side (the pixel on the lower side of the figure). The period during which the potential difference is large is relatively long, and the period during which the potential difference with the left drain line is large is relatively short.

As shown in FIG. 1A, in the pixel on the scanning start side, as compared with the pixel on the scanning end side, the pixel electrode C
The shortest distance WL between E and the drain line DL on the left side thereof is relatively short, and the shortest distance WR between the drain line DL on the right side is relatively long. In this way, the average strength of the lateral electric field during one frame period can be weakened by changing the distance between the pixel electrode and the drain line in accordance with the potential difference generated between them.

FIG. 3 shows a TF according to a modification of the first embodiment.
The schematic plan view of a T-side substrate is shown. In FIG. 1A, the drain line DL is linear and the pixel electrodes C arranged in a line.
The case where the position of E in the row direction is slightly shifted to change the shortest distance between the pixel electrode CE and the drain line DL is shown. In the modified example shown in FIG. 3, the positions of the pixel electrodes arranged in a line in the row direction are aligned, and the drain lines DL have a stepwise pattern.

As described above, by forming the drain lines DL in a stepwise pattern in which steps are formed at the same pitch as the pixel pitch, the shortest distance between each pixel electrode CE arranged in one line and the drain line DL is set to the column. The direction can be changed monotonically.

Next, a liquid crystal display panel according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5.
FIG. 4 is a schematic plan view of the TFT side substrate of the liquid crystal display panel according to the second embodiment. The drain line DL, the gate line GL, the pixel electrode CE, and the thin film transistor TR are formed on the substrate.
Are formed. The basic configuration thereof is the same as that of the TFT side substrate shown in FIG. Hereinafter, FIG.
Differences from the configuration of (A) will be described.

In the case of FIG. 1A, the shortest distance WL between the pixel electrode CE and the drain line DL on the left side thereof monotonically increases from the upper side to the lower side of the figure, and the pixel electrode CE and the drain on the right side thereof are increased. The shortest distance WR to the line DL monotonically decreases from the upper side to the lower side in the figure. On the other hand, in the TFT side substrate shown in FIG. 4, both the shortest distances WL and WR are
It increases monotonically from the top to the bottom of the figure.

Next, a driving method of the liquid crystal display panel according to the second embodiment will be described with reference to FIG. FIGS. 5A and 5B show the states of the applied voltage at the time of scanning the odd-numbered frame and the even-numbered frame, respectively, with + and − signs. A positive voltage is applied to all drain lines DL during odd frame scanning, and a negative voltage is applied to all drain lines DL during even frame scanning. The scanning signal applied to the gate line GL is the same as that in the case of FIG.

As shown in FIG. 5A, positive charges are accumulated in the pixel electrode CE of the pixel which has already been scanned in the frame, and negative charges are accumulated in the pixel electrode CE of the pixel which has not been scanned. Electric charge is accumulated. Therefore, in the pixel above the pixel being scanned, the potential difference between the pixel electrode CE and the drain lines DL on both sides thereof is relatively small,
It is relatively large at pixels below the pixel being scanned.

As shown in FIG. 5B, during even frame scanning, the sign of the voltage applied to the drain line DL and the sign of the charge accumulated in each pixel electrode CE is inverted from the sign during odd frame scanning. There is. Therefore, the magnitude relation of the potential difference between the pixel electrode CE and the drain line DL is the same as that in the odd frame scanning.

Therefore, the period in which the potential difference between the pixel electrode CE and the drain line DL in the lower pixel of the figure is large is
It is longer than that in the upper pixel. As shown in FIG. 4, the shortest distance between the pixel electrode CE and the drain line DL is configured to be longer in a pixel in which the potential difference therebetween is longer. Therefore, the average magnitude of the lateral electric field in one frame period can be reduced.

In the liquid crystal display panel shown in FIG. 4, the aperture ratio of each pixel changes in the column direction, but the amount of transmitted light can be balanced by inclining the brightness of the backlight with respect to the column direction. Let's do it.

As described in the first and second embodiments, in the pixel electrodes arranged in a line along the drain line, the shortest distance between each pixel electrode and each of the two signal lines sandwiching it. However, it is possible to reduce the average magnitude of the lateral electric field in one frame period by configuring it so as to change monotonically in the column direction. Therefore, it is possible to suppress the occurrence of reverse tilt due to the horizontal electric field.

Next, a liquid crystal display panel according to a third embodiment of the present invention will be described with reference to FIG. FIG.
(A) is a TFT of the liquid crystal display panel according to the third embodiment
The schematic plan view of a side board | substrate is shown. Drain line DL on the substrate,
Gate line GL, pixel electrode CE, and thin film transistor T
R is formed. The basic configuration of them is shown in FIG.
This is similar to the case of the TFT side substrate shown in FIG. Hereinafter, FIG.
Differences from the configuration of (A) will be described.

Red, green, or blue color is given to the transmitted light of each pixel, and a red pixel R, a green pixel G, and a blue pixel B are defined. The pixel electrode CE in the red pixel R, the green pixel G, and the blue pixel B and the drain lines D on both sides thereof.
When the shortest distances from L are WR, WG, and WB, respectively, the pixels in the same row are configured to satisfy WR>WG> WB.

FIG. 6B shows a chain line B6 of FIG. 6A.
-A schematic cross-sectional view of a liquid crystal display panel corresponding to B6.
The pixel electrode CE and the drain line D are formed on the surface of the transparent substrate 40.
L is formed. The detailed structure of the pixel electrode CE and the drain line DL is as shown in FIG. 1B, but the illustration of the gate insulating layer is omitted here. An alignment film 42 is formed on the entire surface of the substrate, covering the pixel electrodes CE and the drain lines DL. A color filter 44 is arranged on the surface of the transparent substrate 43, and the common electrode 4 is formed so as to cover the surface.
5 and the alignment film 46 are laminated. Transparent substrates 40 and 4
3 are arranged in parallel so that the alignment film surfaces face each other, and the liquid crystal layer 47 is sandwiched therebetween.

In order to optimize the retardation value of each pixel according to the wavelength of the transmitted light, the thickness of the color filter 44 is increased in the order of red pixel, green pixel and blue pixel. That is, the thickness of the liquid crystal layer 47 becomes smaller in the order of red pixels, green pixels, and blue pixels. As the liquid crystal layer 47 becomes thicker, the distance between the pixel electrode CE and the common electrode 45 facing it becomes longer, so that the liquid crystal layer 47 is easily affected by the lateral electric field.

As shown in FIG. 6A, in a pixel which is easily affected by the lateral electric field, the pixel electrode CE and the drain line D
By increasing the shortest distance from L, the strength of the lateral electric field can be weakened.

With the configuration shown in FIG. 6A, although the aperture ratios of the pixels of the respective colors are different, the amount of transmitted light can be balanced by adjusting the amount of pigment in the color filter. Will.

In FIG. 6A, only the relationship between the pixel electrode CE and the drain line DL in the pixels within one row is shown. However, focusing on the column direction, the pixels of the same color have a constant row interval. It is arranged periodically. In this case, it is preferable that the pixels of the same color arranged in one line are configured to change monotonically in the column direction as described in the first or second embodiment.

Next, a liquid crystal display panel according to the fourth embodiment will be described with reference to FIG. FIG. 7A is a schematic plan view of the TFT side substrate of the liquid crystal display panel according to the fourth embodiment. Drain line DL and gate line G on the substrate
L, the pixel electrode CE, and the thin film transistor TR are formed. The basic configuration of them is the TF shown in FIG.
This is similar to the case of the T-side substrate. Hereinafter, differences from the configuration of FIG. 1A will be described.

The alignment film on the TFT side substrate is rubbed from the upper right to the lower left as indicated by an arrow AR in the figure. Further, a notch 50 is provided in the upper right part of the pixel electrode CE. The size of the cutout 50 is smaller in the lower pixel of the drawing. Further, the cutout 51 is also provided in the lower left portion of the pixel electrode CE. Cutout 5
The size of 1 is larger in the lower pixel in the figure so that the areas of the pixel electrodes CE are substantially equal.

When the alignment film is rubbed in the direction of the arrow AR, the liquid crystal molecules near the TFT side substrate are provided with an alignment property parallel to the arrow AR in the substrate plane and a pretilt in a direction rising from the lower left end of the figure. To be done. When a voltage is applied to this liquid crystal display panel, it is preferable that all liquid crystal molecules rise in the same direction as the pretilt direction.

Liquid crystal molecules in the vicinity of the drain line DL and the gate line GL receive a force in the direction of rising from the end portions on the side of the drain line DL and the gate line GL due to the horizontal electric field. In the vicinity of the left side and the lower side of each pixel electrode CE in the drawing, the pretilt direction and the rising direction due to the horizontal electric field coincide with each other. However, near the upper and right sides of the figure,
The direction of pretilt does not match the direction of rising due to the lateral electric field. Therefore, reverse tilt is likely to occur in this region. In particular, the reverse tilt is likely to occur in the vicinity of the intersection affected by both the drain line DL and the gate line GL.

Notch 5 is formed in a region where reverse tilt is likely to occur.
Since 0 is provided, the lateral electric field in that region can be weakened and the occurrence of reverse tilt can be suppressed. Further, when the liquid crystal display panel shown in FIG. 7 is driven by the method described in FIG. 2, the average lateral electric field on the right side of the pixel electrode CE tends to be stronger in the upper pixel of the figure. Upper pixel electrode C
By increasing the notch 50 of E, the influence of the lateral electric field can be further reduced.

At the apex on the opposite side of the notch 50,
By forming the notches 51 and configuring the areas of the pixel electrodes CE to be equal, the aperture ratios of the pixels can be made substantially equal.

In the case of driving by the method described with reference to FIG. 5, contrary to the method described with reference to FIG. 2, the lower the pixel in the figure, the average lateral electric field on the right side of the pixel electrode CE tends to become stronger. . Therefore, contrary to the case of FIG. 7, it is preferable to make the notch 50 of the pixel electrode CE larger toward the lower pixel.

FIG. 8A shows an alignment division pattern of a liquid crystal display panel adopting the alignment division method. The lower half of each pixel 6 in the drawing is the first alignment divided region 31a, and the upper half is the second alignment divided region 31b. First orientation division region 31a
In the above, the pretilt angle of the TFT side substrate is larger than the pretilt angle of the common substrate side, and the second alignment division region 31b
In, the pretilt angle of the TFT side substrate is smaller than the pretilt angle of the common substrate side. The arrow AR indicates the rubbing direction on the TFT substrate side.

FIG. 8B is a chain line B8 shown in FIG.
-A schematic cross-sectional view of a liquid crystal display panel corresponding to B8.
Since both the left half and the right half of the drawing are the first alignment division regions 31a, the pretilt angle on the TFT substrate side is larger than the pretilt angle on the common substrate side. The alignment film on the TFT substrate side is rubbed from left to right in the figure.

When an electric field is applied to the liquid crystal layer 30, the liquid crystal molecules in the left half and right half regions of the figure both rotate counterclockwise and rise. This rising direction coincides with the rising direction due to the lateral electric field generated near the drain line DL in the left half region, but does not coincide with the right half region. Therefore, the rising direction of the liquid crystal molecules in the vicinity of the edge of the pixel region in the right half region becomes unstable, and the reverse tilt phenomenon easily occurs.

As described above, even in the liquid crystal display panel in which the alignment is divided, the reverse tilt may occur due to the influence of the lateral electric field in the vicinity of the drain line and the gate line. The first
The fourth embodiment is also effective in the liquid crystal display panel in which the alignment is divided.

The present invention has been described above with reference to the embodiments.
The present invention is not limited to these. For example, it will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

[0066]

As described above, according to the present invention,
In the region where the average voltage between the pixel electrode and the drive wiring is high, the shortest distance between the pixel electrode and the drive wiring is long, so that the strength of the lateral electric field can be weakened. This allows
It is possible to suppress the occurrence of reverse tilt due to the horizontal electric field.

Further, in the multi-gap type color liquid crystal display panel, the shorter the distance between the pixel electrode and the drive wiring is, the longer the pixel has a thicker liquid crystal layer. Therefore, it is possible to reduce the strength of the horizontal electric field in a pixel having a thick liquid crystal layer in which a horizontal electric field is easily generated.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a TFT side substrate of a liquid crystal display panel according to a first embodiment of the present invention, and a sectional view of the liquid crystal display panel.

FIG. 2 is a schematic plan view of a TFT side substrate for explaining a driving method of the liquid crystal display panel according to the first embodiment of the present invention.

FIG. 3 is a schematic plan view of a TFT side substrate of a liquid crystal display panel according to a modification of the first embodiment of the present invention.

FIG. 4 is a schematic plan view of a TFT side substrate of a liquid crystal display panel according to a modification of the second embodiment of the present invention.

FIG. 5 is a schematic plan view of a TFT side substrate for explaining a driving method of a liquid crystal display panel according to a second embodiment of the present invention.

FIG. 6 is a schematic plan view of a TFT side substrate of a liquid crystal display panel according to a third embodiment of the present invention, and a sectional view of the liquid crystal display panel.

FIG. 7 is a schematic plan view of a TFT side substrate of a liquid crystal display panel according to a fourth embodiment of the present invention.

FIG. 8 is a diagram and a cross-sectional view showing an example of an alignment division pattern of an alignment division type liquid crystal display panel.

[Explanation of symbols]

 1, 21 Transparent substrate 2, 25 Alignment film 6 Pixel 12 Gate insulating layer 13 TFT protective layer 22 Black matrix 23 Color filter 24 Common electrode 27, 28 Polarizing plate 30 Liquid crystal layer 31a First alignment division region 31b Second alignment division region 40 , 43 transparent substrate 42, 46 alignment film 44 color filter 45 common electrode 47 liquid crystal layer 50 notch R red pixel G green pixel B blue pixel DL drain line GL gate line CE pixel electrode TR thin film transistor

Claims (7)

[Claims] 1. A first and a second substrate which are arranged to face each other with a gap, and drive wirings which are formed in a grid pattern on the facing surface of the first substrate and which extend in the column direction. The drive line formed of a plurality of signal lines and a plurality of control lines extending in the row direction, and the signal line and the control in a region on the facing surface of the first substrate that does not overlap with the drive line. A pixel electrode formed corresponding to each of the intersections of the lines, wherein the pixel electrodes are arranged in a line between two signal lines adjacent to each other among the pixel electrodes. And a pixel electrode whose shortest distance between each of the two signal lines sandwiching the pixel electrode monotonously changes in the column direction, and a corresponding pixel electrode formed for each pixel electrode and two signal lines sandwiching the pixel electrode. One of the plurality of control lines is connected to one of the signal lines A liquid crystal display panel comprising: a switching element controlled by the above; a common electrode formed on an opposite surface of the second substrate; and a liquid crystal layer sandwiched between the first and second substrates. 2. A scanning signal for scanning the control line from one end to the other end in the column direction in one frame scanning period is applied to the control line, and the corresponding switching elements are sequentially turned on. Scan signal applying means for bringing into a conductive state, and image signal applying means for applying an image signal to the signal line in synchronization with the scan signal applied by the scan signal applying means. The positive and negative of the voltage to be applied is reversed, and the image signal applying means for applying the image signal so that the voltages applied to the mutually adjacent signal lines have opposite phases, and among the pixel electrodes, In the pixel electrodes arranged in a line between two signal lines adjacent to each other, the shortest distance between each pixel electrode and the signal line connected via the switching element among the two signal lines sandwiching the pixel electrode Distance is With respect to the column direction, monotonically increases from the one end to the other end, and the shortest distance from the other signal line of the two signal lines is the one from the one end to the other end with respect to the column direction. The liquid crystal display panel according to claim 1, wherein the liquid crystal display panel monotonically decreases toward the above. 3. A scanning signal for scanning the control line from one end to the other end in the column direction in one frame scanning period is applied to the control line, and the corresponding switching elements are sequentially turned on. Scan signal applying means for bringing into a conductive state, and image signal applying means for applying an image signal to the signal line in synchronization with the scan signal applied by the scan signal applying means. The image signal applying means for applying an image signal so that the positive and negative of the applied voltage are reversed and the voltages applied to all the signal lines are in phase, and the pixel electrodes are adjacent to each other. In the pixel electrodes arranged in a line between the two signal lines, the shortest distance between each pixel electrode and each of the two signal lines sandwiching the pixel electrode is from the one end with respect to the column direction. Towards the other end The liquid crystal display panel according to claim 1, wherein the liquid crystal display panel monotonically increases. 4. Of the vicinity of each edge of the pixel electrode,
Of the four intersections of the drive wiring that surrounds the pixel electrode,
In the vicinity of at least two drive wirings continuous to at least one intersection, the liquid crystal molecules on the first substrate side are given a pretilt in a direction of rising from the end portion on the side opposite to the drive wirings, and the pixel electrode is The parallelogram region having two pairs of sides that are parallel to the signal line and the control line, respectively, and has a shape in which at least the vicinity of a vertex corresponding to the one intersection is cut out. The liquid crystal display panel described in. 5. A first and a second substrate arranged to face each other with a gap, and drive wirings formed in a grid pattern on the facing surface of the first substrate and extending in the column direction. The drive line formed of a plurality of signal lines and a plurality of control lines extending in the row direction, and the signal line and the control in a region on the facing surface of the first substrate that does not overlap with the drive line. A pixel electrode that is formed corresponding to each of the intersections of the lines and defines a pixel; and a red light that is formed on at least one surface of the first and second substrates, A color filter that transmits one of green light and blue light, and a pixel electrode that is formed for each pixel electrode and connects one of the two signal lines that sandwich the corresponding pixel electrode, A switch controlled by one of the plurality of control lines. And a common electrode formed on the facing surface of the second substrate, a liquid crystal layer sandwiched between the first and second substrates, and one of the first and second substrates facing each other. Formed on the surface,
A liquid crystal layer thickness adjusting unit that adjusts the thickness of the liquid crystal layer so that the thickness of the liquid crystal layer in each pixel becomes smaller in the order of red pixels, green pixels, and blue pixels; In the pixel electrodes arranged in one row, the shortest distance between the pixel electrode and each of the two signal lines that sandwich the pixel electrode is a red pixel that transmits red light, a green pixel that transmits green light and a blue pixel that transmits blue light. A liquid crystal display panel in which the pixel electrode and the signal line are arranged so that the blue pixel becomes shorter in order. 6. In the pixel electrodes arranged in one row among the pixel electrodes, the shortest distance between the pixel electrode and each of the two control lines sandwiching the pixel electrode is the order of the red pixel, the green pixel, and the blue pixel. The liquid crystal display panel according to claim 5, wherein the pixel electrode and the control line are arranged so as to be short. 7. Among pixel electrodes arranged in a line between two signal lines adjacent to each other among the pixel electrodes, among pixel electrodes of pixels of the same color, each pixel electrode and a pixel electrode sandwiching the pixel electrode are sandwiched therebetween.
7. The liquid crystal display panel according to claim 5, wherein the shortest distance from each of the signal lines of the book monotonously changes in the column direction.