JPH10186400A - Liquid crystal display device - Google Patents

Abstract

[PROBLEMS] To generate a disclination line due to the effect of an electric field generated between an auxiliary capacitance electrode and an auxiliary capacitance electrode formed at the edge of a pixel electrode. And a high-quality image with almost no defects due to the disclination line is displayed. A storage capacitor electrode is formed by forming a predetermined region of a peripheral portion of a pixel electrode 3 on an upstream side in an alignment processing direction a of an alignment film above the pixel electrode when viewed from the center of the pixel electrode. By avoiding this, most of the horizontal electric field generated between the edge of the pixel electrode 3 and the outer peripheral edge of the auxiliary capacitance electrode 13 aligns the liquid crystal molecules in a direction that is not much different from the alignment direction by the alignment film. The generation of disclination lines due to the influence of the horizontal electric field was suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix type liquid crystal display device.

[0002]

2. Description of the Related Art An active matrix type liquid crystal display element comprises a plurality of pixel electrodes arranged in a matrix, a plurality of switching elements connected to each of the pixel electrodes, and
A plurality of scanning lines for supplying a control signal to the switching element, a signal line for providing a data signal to the switching element, and one substrate on which an alignment film is formed, and In this active matrix liquid crystal display element, the potential of the pixel electrode is held during the non-selection period. In this active matrix liquid crystal display element, a liquid crystal is interposed between the counter electrode and the other substrate on which an alignment film is formed. Therefore, an auxiliary capacitance electrode facing the edge of the pixel electrode is provided on the one substrate via an insulating film, and an auxiliary capacitance called a storage capacitor is formed between the auxiliary capacitance electrode and the pixel electrode. ing.

FIG. 4 is a front view of a part of a conventional active matrix liquid crystal display device, FIG. 5 is an enlarged view of one pixel portion, and FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. Note that this liquid crystal display element is a color image display element provided with red, green, and blue color filters corresponding to each pixel electrode. Here, the pixel electrodes are arranged in a mosaic pattern. .

A pair of substrates 1 and 2 of this liquid crystal display element comprises
A transparent substrate made of glass or the like, and on one of the substrates, for example, on the inner surface of a back-side substrate (hereinafter, referred to as a back-side substrate) 1, a plurality of upper and lower edges formed in a rectangular shape parallel to the horizontal axis O of the screen Transparent pixel electrodes 3 are arranged in a row direction (a direction along the horizontal axis O) and a column direction (a direction intersecting the horizontal axis O).

In FIG. 4, an electrode (R) is a pixel electrode for displaying a red pixel, an electrode (G) is a pixel electrode for displaying a green pixel, and an electrode (B) is a blue electrode. These pixel electrodes 3 are alternately arranged in the row direction, and the pixel electrodes 3 for displaying pixels of the same color in the column direction are shifted left and right by about 1.5 pitches (in the row direction). ) Are alternately shifted in zigzag.

On the inner surface of the back substrate 1, a plurality of switching elements 4 composed of TFTs (thin film transistors) are provided corresponding to the respective pixel electrodes 3, and the switching elements 4 in each pixel electrode row are provided. A plurality of scanning lines 10 for supplying a signal (gate signal) for controlling the on / off operation and a signal line 11 for supplying a data signal to the switching element 4 of each pixel electrode column are provided.

The switching element (TFT) 4 includes a gate electrode 5 formed on the substrate 1, a gate insulating film 6 covering the gate electrode 5, and a gate insulating film 6 on the gate insulating film 6 facing the gate electrode. An i-type semiconductor film 7 formed;
A source electrode 8 and a drain electrode 9 are formed on the i-type semiconductor film 7 via an n-type semiconductor film (not shown).

The scanning lines 10 are wired on the substrate 1 along each pixel electrode row, and the gate electrodes 5 of the switching elements 4 in each row are connected to the scanning lines 10 along the row.
Are formed integrally.

A gate insulating film (transparent film) 6 of the switching element 4 is formed over substantially the entire surface of the substrate 1 so as to cover the scanning lines 10, and the pixel electrode 3 is formed on the gate insulating film 6. It is formed and connected to the source electrode 8 of the switching element 4 in the vicinity of one end corner of the side edge adjacent to the scanning line 10 corresponding to the pixel electrode row.

The signal lines 11 are arranged on the gate insulating film 6 along each pixel electrode column (zigzag pixel electrode column) for displaying pixels of the same color. Each switching element 4 is connected to the drain electrode 9.

The wiring pattern of the signal line 11 will be described with respect to a signal line along one pixel electrode row in which pixel electrodes 3 for displaying pixels of the same color are arranged in a zigzag pattern. 4, meandering wiring is arranged along the right edge of the pixel electrode 3 shifted to the left and the left edge of the pixel electrode 3 shifted to the right, and the right edge and the left edge of the pixel electrode 3 in each row are arranged. The horizontal wiring section connecting the vertical wiring sections along the scanning line 1 between the adjacent pixel electrode rows.
The scanning line 10 is formed so as to pass above the scanning line 10 in parallel with the scanning line 10.

The reason why the signal lines 11 are wired in this way is to shorten the length of a horizontal wiring portion passing between adjacent pixel electrode rows, thereby simplifying the routing of the signal lines 11. However, when the signal line 11 is wired in this manner, the position of the signal line 11 with respect to the switching element 4 corresponding to the pixel electrode 3 shifted to the left and the switching element 4 corresponding to the pixel electrode 3 shifted to the right. And the switching element 4 corresponding to the pixel electrode 3 shifted to the left, and the switching element 4 corresponding to the pixel electrode 3 shifted to the right. The source and drain electrodes 8 and 9 are formed with the positional relationship being reversed.

The signal line 11 and each switching element 4
Is covered with a transparent protective insulating film 12 (see FIG. 6), and this protective insulating film 12 is formed between the rows and columns of each pixel electrode so as to slightly overlap the periphery of each pixel electrode 3. ing.

Further, an auxiliary capacitor (storage capacitor) for holding the potential of the pixel electrode 3 during the non-selection period is provided on the back substrate 1 so as to correspond to each pixel electrode 3.
An auxiliary capacitance electrode 13 for forming Cs is provided.

The auxiliary capacitance electrode 13 is formed on the substrate 1 (under the gate insulating film 6 of the switching element 4) so as to face the edge of the pixel electrode 3 via the gate insulating film 6. The storage capacitor Cs is connected to the storage capacitor electrode 13.
And each pixel electrode 3 and the gate insulating film 6 between them.

In general, the auxiliary capacitance electrode 13 is opposed to three edges of the peripheral edge of the pixel electrode 3 except for a side edge adjacent to the scanning line 10 corresponding to the pixel electrode row. It is formed in a plane U-shape. These auxiliary capacitance electrodes 13 are formed continuously for each pixel electrode row, and a reference potential connection terminal (not shown) is formed at an end of the row. The auxiliary capacitance electrode 13, the gate electrode 5 of the switching element 4, and the scanning line 10 are formed by patterning the same metal film.

On the inner surface of the back substrate 1, as shown in FIG. 6, an alignment film 1 made of polyimide or the like is formed over the entire area where the pixel electrodes 3 and the switching elements 4 are formed.
The alignment film 14 is formed by rubbing the surface of the alignment film 14 in a predetermined direction.

On the other hand, as shown in FIG. 6, a light-shielding film 16 having a lattice pattern for defining the size of the pixel A is provided on the inner surface of the substrate (hereinafter referred to as the front substrate) 2 on the front surface side of the liquid crystal display element. In addition, red, green, and blue color filters 17 are provided so as to face the pixel electrodes 3 for displaying pixels of that color, respectively, and one color filter 17 facing all the pixel electrodes 3 is provided thereon. Sheet-shaped transparent counter electrode 18
Is provided.

The light-shielding film 16 is generally formed of a metal film such as chromium, and each of the openings 16a is formed as shown in FIG.
As shown in FIG. 6, the pixel electrode 3 is formed slightly smaller than the outer shape.

An alignment film 19 made of polyimide or the like is formed on the inner surface of the front substrate 2 over the entire area where the pixel electrode 3 and the switching element 4 are formed. The alignment treatment is performed by rubbing in a predetermined direction.

The back substrate 1 and the front substrate 2 are
The liquid crystal display device is joined via a frame-shaped sealing material (not shown) surrounding the display area of the liquid crystal display element, and a liquid crystal 20 is sealed in a region between the two substrates 1 and 2 surrounded by the sealing material. . Polarizing plates 2 are provided on the outer surfaces of both substrates 1 and 2, respectively.
1 and 22 are arranged.

This liquid crystal display element is a TN (Twisted
The alignment films 14 and 19 provided on the substrates 1 and 2 are aligned in directions substantially orthogonal to each other, and molecules 20a of the liquid crystal 20 (see FIG. 6) are 2 in the vicinity of the alignment film 14,
19, the two substrates 1 and 2 are twist-oriented at a twist angle of approximately 90 °.

4 and 5, the arrow a indicates the direction of the alignment treatment of the alignment film 14 on the rear substrate 1 and the arrow b indicates the direction of the front substrate 2
Of the alignment film 19 of FIG. As shown in the figure, the alignment film 15 of the back substrate 1 is subjected to an alignment process in a direction approximately 45 ° counterclockwise with respect to the horizontal axis O of the screen when viewed from the front side of the liquid crystal display element. Has been aligned in a direction approximately 45 ° clockwise with respect to the horizontal axis O when viewed from the front side, and the liquid crystal molecules 20a have the twist direction on the back side as shown by the dashed arrow T in FIG. From the substrate 1 toward the front substrate 2, approximately 90 degrees counterclockwise when viewed from the front side.
Twist orientation at a twist angle of °.

Although FIG. 6 shows only the liquid crystal molecules 20 a near the back substrate 1, the liquid crystal molecules 20 a are aligned with the surface of the alignment films 14 and 19 on any of the substrates 1 and 2. In the state where the molecular ends on the side toward the alignment processing directions (rubbing directions) a and b are pretilted so as to rise obliquely at an angle of several degrees (2 to 3 °), alignment is performed along the alignment processing directions a and b. doing.

The polarizing plates 21 and 22 are arranged so that their transmission axes are substantially parallel to each other or substantially orthogonal to each other. Substrate 1 or 2 with adjacent plate
Is substantially parallel or substantially perpendicular to the alignment direction of the liquid crystal molecules 20a in the vicinity of.

In the liquid crystal display element, a signal of a reference potential is supplied to the counter electrode 18, and each scanning line 10 has a waveform that turns on the switching element 4 during the selection period of the corresponding pixel electrode row. The display is driven by supplying a control signal of the above-described manner and supplying a data signal having a potential corresponding to the image data to each signal line 11 for each selection period of the pixel electrode row.

[0027]

By the way, the active matrix type liquid crystal display element has a gate electrode of the switching element 4 on an inner surface of a substrate 1 (here, a front substrate) provided with a pixel electrode 3 and a switching element 4 thereof. Since the auxiliary capacitance electrode 13 is provided facing the edge of the pixel electrode 3 with the insulating film 6 interposed therebetween, the edge of the pixel electrode 3 to which the data signal is supplied via the switching element 4 at the time of display driving is provided. An electric field called a transverse electric field corresponding to a difference between the respective potentials is generated between the storage capacitor electrode 13 connected to the reference potential and the outer peripheral edge of the storage capacitor electrode 13 (a portion protruding outside the pixel electrode 3). Occur.

In FIG. 6, E indicates a horizontal electric field generated between the auxiliary capacitance electrode 13 and the pixel electrode 3. This horizontal electric field E indicates the auxiliary capacitance in the peripheral portion of the pixel electrode 3. It occurs near the edges of the three sides facing each other.

When such a lateral electric field E acts near the edge of the pixel electrode 3, the affected area (the alignment film 14,
Liquid crystal molecules (hatched in the figure) of liquid crystal molecules in the region where an electric field with a strength to overcome the alignment control force of 19 acts.
20a, the horizontal electric field E
Is oriented so that the molecular end on the side toward the direction of (2) rises obliquely.

In this case, the horizontal electric field E is generated from the pixel electrode 3 toward the auxiliary capacitance electrode 13. Since the auxiliary capacitance electrode 13 faces three edges of the pixel electrode 3, The direction of the lateral electric field E generated near the three edges is different for each side. Therefore, the orientation direction of the liquid crystal molecules 20 a due to the lateral electric field E is different for each side of the pixel electrode 3.

On the other hand, inside and outside (the center side of the pixel electrode 3) and outside of the region not affected by the horizontal electric field E, that is, the region where an electric field having a strength to overcome the alignment regulating force of the alignment films 14 and 19 acts. Looking at the alignment state of the liquid crystal molecules 20a, the liquid crystal molecules 20a in the vicinity of the rear substrate 1 in this region are aligned along the alignment processing direction a of the alignment film 14 on the pixel electrode 3 and the molecular ends thereof in the direction. Are uniformly oriented in a pretilt state so as to rise obliquely.

For this reason, a lateral electric field acting near the edge of the alignment film 14 on the side facing the center of the pixel electrode 3 in the alignment processing direction a in the vicinity of the three sides of the pixel electrode 3. The alignment direction of the liquid crystal molecules 20a by E
Liquid crystal molecules 20a due to the transverse electric field E acting near the edge on the upstream side of the alignment processing direction a (the edge opposite to the direction of the arrow in the figure). Is almost opposite to the direction of alignment by the alignment film 14.

That is, as shown in FIG. 5, the alignment direction a of the alignment film 14 on the pixel electrode 3 is substantially 45 ° counterclockwise with respect to the horizontal axis O of the screen when viewed from the front side of the liquid crystal display element. In some cases, the orientation direction of the liquid crystal molecules 20a due to the lateral electric field E acting near the left edge in the drawing, in the vicinity of the three edges of the pixel electrode 3, is a direction that is not much different from the orientation direction by the orientation film 14. However, the alignment direction of the liquid crystal molecules 20 a by the lateral electric field E acting near the upper and right edges is almost opposite to the alignment direction by the alignment film 14.

Therefore, in the conventional liquid crystal display element, the vicinity of the three side edges of the pixel electrode 3 is on the upstream side in the alignment processing direction a of the alignment film 14 thereabove when viewed from the center of the pixel electrode 3. In the vicinity of the edge, that is, in the vicinity of the upper and right edges of the pixel electrode 3 in FIG. 5, the alignment of the liquid crystal molecules 20a at the boundary between the region affected by the horizontal electric field E and the region not affected by the horizontal electric field E A boundary of the orientation state where the state is reversed occurs.

The boundary between the alignment states is called a disclination line. The disclination line D extends from the vicinity of the upper edge of the pixel electrode 3 as shown by a thick chain line in FIGS. Occurs near the right edge.

For this reason, the conventional liquid crystal display element has a problem that a display defect along the disclination line D occurs in each pixel (a region corresponding to each opening 16a of the light shielding film 16).

This defect is caused by light leakage along the disclination line D in a negative display type liquid crystal display device in which a pair of polarizing plates 21 and 22 are disposed with their transmission axes substantially parallel to each other. , 22 are shadows along the disclination line D in a liquid crystal display device of a positive display type in which transmission axes thereof are substantially orthogonal to each other, and in particular, in a liquid crystal display device of a negative display type, light leaks into each pixel. If there is, the brightness of the entire pixel is slightly blurred due to the brightness, so that the occurrence of the disclination line D has a greater effect on the image quality.

According to the present invention, while the auxiliary capacitance is formed by opposing the auxiliary capacitance electrode to the edge of the pixel electrode, the generation of the disclination line due to the effect of the electric field generated between these electrodes is suppressed. It is another object of the present invention to provide a liquid crystal display element that can display a high-quality image with few defects due to disclination lines.

[0039]

According to the present invention, a plurality of pixel electrodes arranged in a matrix are formed, and an auxiliary capacitance is formed between the plurality of pixel electrodes and an edge of the pixel electrodes with an insulating film interposed therebetween. An auxiliary capacitance electrode, a plurality of switching elements connected to each of the pixel electrodes, a plurality of scanning lines for supplying a control signal to the switching element, and a signal line for supplying a data signal to the switching element. One substrate provided with an alignment film formed thereon,
In an active matrix type liquid crystal display device in which a liquid crystal is interposed between the other substrate provided with a counter electrode opposed to each of the pixel electrodes and an alignment film formed thereon, the auxiliary capacitance electrode is It is characterized in that a peripheral region of the pixel electrode is provided so as to avoid a predetermined region of an edge portion on the upstream side in the alignment processing direction of the alignment film above the pixel electrode when viewed from the center of the pixel electrode.

That is, according to the present invention, by selecting the position where the storage capacitor electrode is provided, the lateral electric field for generating the disclination line (the liquid crystal molecules are oriented in the direction opposite to the alignment processing direction of the alignment film on the pixel electrode). This suppresses the generation of an electric field for orienting), and as described above, the auxiliary capacitance electrode is positioned upstream from the center of the pixel electrode in the peripheral portion of the pixel electrode in the alignment processing direction of the alignment film thereon. If it is provided so as to avoid a predetermined region of the side edge, a horizontal electric field generated between the edge of the pixel electrode and the outer peripheral edge of the auxiliary capacitance electrode is almost entirely caused by the alignment film. This is an electric field for orienting the liquid crystal molecules in a direction that is not much different from the orientation direction.

Therefore, according to the liquid crystal display device of the present invention, while the auxiliary capacitance is formed by opposing the auxiliary capacitance electrode to the edge of the pixel electrode, the influence of the horizontal electric field generated between these electrodes is obtained. Can suppress the occurrence of disclination lines, and display a high-quality image with almost no defects due to disclination lines.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the liquid crystal display element of the present invention, as described above, the auxiliary capacitance electrode is formed on the peripheral portion of the pixel electrode by the alignment treatment of the alignment film thereon when viewed from the center of the pixel electrode. By providing a predetermined area in the edge portion on the upstream side in the direction, the generation of disclination lines due to the influence of the electric field generated between these electrodes is suppressed.

In the liquid crystal display device according to the present invention, the pixel electrode is formed in a rectangular shape, and the alignment processing direction of the alignment film thereon is a direction obliquely intersecting each edge of the pixel electrode. Is provided so as to avoid the edge of at least one of the two edges on the upstream side in the alignment processing direction of the alignment film thereover when viewed from the center of the pixel electrode. Just do it.

[0044]

1 to 3 show an embodiment in which the present invention is applied to an active matrix type liquid crystal display device for displaying a color image. FIG. 1 is a front view of a part of the liquid crystal display device, and FIG. Is an enlarged view of one of the pixel portions, and FIG.
FIG. 3 is an enlarged sectional view taken along line III-III of FIG.
It is an expanded sectional view which follows the III line.

In the liquid crystal display element of this embodiment, the formation position of the auxiliary capacitance electrode 13 with respect to the pixel electrode 3 is shown in FIGS.
Although the configuration is different from the conventional liquid crystal display device shown in FIG. 6, the other configuration is basically the same as the conventional liquid crystal display device. Therefore, corresponding components are denoted by the same reference numerals and redundant description is omitted.

In this liquid crystal display element, an auxiliary capacitance electrode 13 provided on the inner surface of the back substrate 1 so as to be opposed to the edge of the pixel electrode 3 is provided at the periphery of the pixel electrode 3.
Of the alignment film 14 on the upstream side in the alignment processing direction a when viewed from the center (the edge opposite to the direction of the arrow in the figure). In this embodiment, the pixel electrode 3 is formed in a rectangular shape, and the alignment film 14 on the pixel electrode 3 is aligned in a direction obliquely intersecting with each edge of the pixel electrode 3. The electrode 13 is provided so as to avoid the edge of one of the two edges on the upstream side of the alignment film 14 in the alignment processing direction a.

That is, in this embodiment, as shown in FIGS. 1 and 2, the upper and lower edges of the pixel electrode 3 are parallel to the horizontal axis O of the screen, and the horizontal direction (the direction along the horizontal axis O). ) Is slightly larger than the width in the vertical direction (the direction perpendicular to the horizontal axis O), and the alignment film 14 thereon is
The liquid crystal display element is aligned in a direction approximately 45 ° counterclockwise to the horizontal axis O when viewed from the surface side of the liquid crystal display element, and the auxiliary capacitance electrode 13 is aligned with the upstream side in the alignment processing direction a of the alignment film 14. It is formed in a plane U-shape so as to face the other three sides of the upper and right edges, which are the edge portions of the pixel electrodes, except for the lower edge portion having a longer side length.

In this embodiment, the switching element 4 corresponding to each pixel electrode 3 is connected to the auxiliary capacitance electrode 13.
The scanning lines 10 and the signal lines 11 are wired according to the positions of the switching elements 4.

In this liquid crystal display element, by selecting a position where the auxiliary capacitance electrode 13 is provided, a lateral electric field for generating a disclination line (liquid crystal molecules in a direction opposite to the direction of the alignment treatment of the alignment film on the pixel electrode) is selected. This suppresses the generation of an electric field for orienting the pixel electrode, and as described above, the storage capacitor electrode is connected to the pixel electrode 3 of the peripheral portion of the pixel electrode 3.
Of the alignment film 14 on the upstream side in the alignment processing direction a of the alignment film 14 when viewed from the center. Most of the horizontal electric field E generated between the liquid crystal molecules and the liquid crystal molecules is an electric field for orienting the liquid crystal molecules 20a in a direction that is not so different from the alignment direction by the alignment film.

For this reason, according to the liquid crystal display device, the lateral electric field E generated between the pixel electrode 3 and the auxiliary capacitance electrode 13 is generated.
Can suppress the generation of disclination lines due to the influence of.

This can be seen by comparing FIG. 2 with FIG. 5, and in the conventional liquid crystal display element, as shown in FIG. Since the auxiliary capacitance electrode 13 is opposed to the edge of the alignment film on the upstream side in the alignment processing direction a, the lateral capacitance generated between the pixel electrode 3 and the auxiliary capacitance electrode 13 near this edge. Although the disclination line D is generated due to the influence of the electric field, the auxiliary capacitance electrode 13 is opposed to the edge of the pixel electrode on the upstream side in the alignment processing direction a as shown in FIG. Since no lateral electric field is generated in the vicinity of the edge, no disclination line is generated due to the influence.

Therefore, according to the above liquid crystal display device,
Although the auxiliary capacitance Cs is formed by opposing the auxiliary capacitance electrode 13 to the edge of the pixel electrode 3, the generation of the disclination line due to the influence of the horizontal electric field E generated between these electrodes 3 and 13 is prevented. By suppressing this, it is possible to display a high-quality image free from defects due to the disclination line, that is, light leakage (in the case of the negative display type) and shadow (in the case of the positive display type) in the pixel A.

In this embodiment, the auxiliary capacitance electrode 1
3 is formed in the above-mentioned U-shape in a plane, so that the upper and right edges of the pixel electrode edge on the upstream side in the alignment processing direction a of the alignment film 14 on the pixel electrode 3 The storage capacitor electrode 13 is opposed to the right side edge of which the side length is short. Therefore, the right edge portion of the pixel electrode 3 and the storage capacitor electrode 13
A horizontal electric field that causes the liquid crystal molecules 20a to be oriented in a direction opposite to the orientation direction by the orientation film 14 is generated between
Since the strength of the lateral electric field acting near the edge of the pixel electrode having the shorter side length is small, there is almost no occurrence of a disclination line due to the influence of the lateral electric field.

As in the above embodiment, the pixel electrode 3 is formed in a rectangular shape, and the alignment processing direction a of the alignment film 14 on the pixel electrode 3 obliquely intersects each edge of the pixel electrode 3. Direction, the auxiliary capacitance electrode 13 is located on the upstream side in the alignment processing direction a when viewed from the center of the pixel electrode 3.
It may be formed in a plane L shape avoiding both edges of the side,
By forming the auxiliary capacitance electrode 13 in this manner, the occurrence of disclination lines can be more reliably prevented.

Further, the liquid crystal display device of the above embodiment has red,
The present invention displays green and blue pixels in a mosaic array pattern. The present invention provides an active matrix type liquid crystal display device in which pixels of each color are linearly arranged in a column direction, and displays a monochrome image. The present invention can also be applied to an active matrix type liquid crystal display device.

[0056]

According to the liquid crystal display device of the present invention, the auxiliary capacitance electrode is located on the peripheral portion of the pixel electrode, on the upstream side in the alignment processing direction of the alignment film thereabove when viewed from the center of the pixel electrode. Since the auxiliary capacitor is formed so as to avoid a predetermined area of the edge, the auxiliary capacitor is formed by opposing the auxiliary capacitor electrode to the edge of the pixel electrode. It is possible to suppress the occurrence of disclination lines and display a high-quality image with almost no defects due to the disclination lines.

[Brief description of the drawings]

FIG. 1 is a front view of a part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of one pixel portion of the liquid crystal display element.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a front view of a part of a conventional active matrix type liquid crystal display device.

FIG. 5 is an enlarged view of one pixel portion of a conventional liquid crystal display element.

FIG. 6 is an enlarged sectional view taken along the line VI-VI of FIG. 4;

[Explanation of symbols]

 Reference numerals 1, 2, substrate 3, pixel electrode 4, switching element 10, scanning line 11, signal line 14, alignment film a, alignment processing direction 16, light shielding film A, pixel 17, color filter 18, counter electrode 19, alignment film b ... Alignment direction 20a ... Liquid crystal molecules E ... Horizontal electric field

Claims (2)

[Claims] 1. A plurality of pixel electrodes arranged in a matrix, an auxiliary capacitance electrode facing an edge of the pixel electrode via an insulating film, and forming an auxiliary capacitance between the pixel electrode and an auxiliary capacitance electrode.
A plurality of switching elements respectively connected to the pixel electrodes; a plurality of scanning lines for supplying control signals to the switching elements; and a signal line for supplying data signals to the switching elements. An active matrix type liquid crystal display device in which a liquid crystal is interposed between one substrate having an alignment film formed thereon and a counter electrode facing each of the pixel electrodes and having the alignment film formed thereon. In the above, the storage capacitor electrode is formed of a peripheral portion of the pixel electrode,
A liquid crystal display element, wherein the liquid crystal display element is provided so as to avoid a predetermined region of an edge portion of the alignment film on the upstream side in the alignment processing direction when viewed from the center of the pixel electrode. 2. The pixel electrode is formed in a rectangular shape.
The alignment processing direction is a direction obliquely intersecting with each edge of the pixel electrode, and the storage capacitor electrode is upstream of an alignment processing direction of an alignment film on the storage electrode when viewed from the center of the pixel electrode. 2. The liquid crystal display element according to claim 1, wherein the liquid crystal display element is provided so as to avoid an edge of at least one of the two side edges.