JP2010286575A - Liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-plane switching liquid crystal display panel having a large numerical aperture in which, the shape of a sub-pixel has a bent part, and ends of a display area has a rectangular shape. <P>SOLUTION: The in-plan switching liquid crystal display panel 10 having a lower electrode 19 and an upper electrode 22 in which a plurality of slit-like openings 23 each having a bent part are formed on the sub-pixel 11 having the bent parts, and light shielding layers 26, 26a and 26b shielding light for a non-display area and, thereby, forming the openings of the display area, which are formed on a color filter substrate. The light shielding layers 26, 26a, 26b of the non-display area are formed such that the outermost peripheral sides of the display area has a rectangular shape. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a horizontal electric field type liquid crystal display panel, and in particular, has a large aperture ratio in which the end portion of a display region is formed in a square shape while the shape of a sub-pixel has a bent portion. The present invention relates to a horizontal electric field liquid crystal display panel.

Liquid crystal display panels are characterized by their light weight, thinness, and low power consumption compared to CRTs (cathode ray tubes), and are therefore used in many electronic devices for display purposes. A liquid crystal display panel displays an image by changing the direction of liquid crystal molecules aligned in a predetermined direction by an electric field by using a rubbing-treated alignment film, and changing the amount of light transmitted or reflected.

As a method of applying an electric field to a liquid crystal layer of a liquid crystal display panel, there are a vertical electric field type and a horizontal electric field type. A vertical electric field type liquid crystal display panel applies a substantially vertical electric field to liquid crystal molecules by a pair of electrodes arranged with a liquid crystal layer interposed therebetween. Known examples of the vertical electric field type liquid crystal display panel include a TN (Twisted Nematic) mode, a VA (Vertical Alignment) mode, and an MVA (Multi-domain Vertical Alignment) mode. A horizontal electric field type liquid crystal display panel is provided with a pair of electrodes insulated from each other on one inner surface side of a pair of substrates disposed with a liquid crystal layer interposed therebetween, and a substantially horizontal electric field is applied to liquid crystal molecules. To be applied. This horizontal electric field type liquid crystal display panel has an IP in which a pair of electrodes do not overlap in a plan view.
An S (In-Plane Switching) mode and an overlapping FFS (Fringe Field Switching) mode are known.

Of these, the IPS mode liquid crystal display panel is formed in a comb-like shape so that a pair of electrodes composed of a pixel electrode and a common electrode are engaged with each other while being electrically insulated from each other. In the meantime, a horizontal electric field is applied to the liquid crystal. This IPS mode liquid crystal display device has an advantage that the viewing angle is wider than that of a vertical electric field type liquid crystal display device.

In addition, the FFS mode liquid crystal display panel has a pair of electrodes composed of an upper electrode and a lower electrode arranged in different layers with an insulating film interposed therebetween, and a slit-like opening is provided in the upper electrode, and passes through the slit-like opening. A horizontal electric field is applied to the liquid crystal layer. The FFS mode liquid crystal display panel is widely used in recent years because it can obtain a wide viewing angle and improve image contrast.

In a horizontal electric field type liquid crystal display panel, a slit-like opening formed in the upper electrode (in the case of FFS mode) or an opening formed between the two electrodes in plan view (in the case of IPS mode. The liquid crystal molecules can be rotated in the same direction by extending so as to be slightly inclined with respect to the rubbing direction. In a liquid crystal display panel for color display, the change in color due to the viewing angle can be reduced by multi-domaining in which the inclination angle of the slit-shaped opening with respect to the rubbing direction is divided into two areas, positive and negative. However, since the end of the slit-shaped opening is difficult to form an electric field in a desired direction,
When slit-like openings having different extending directions are separated from each other, the number of ends of the slit-like openings is increased, so that the aperture ratio is lowered.

Therefore, in the liquid crystal display panels disclosed in the following Patent Document 1 and Patent Document 2, a multi-domain is achieved by providing a bent portion in the slit-shaped opening and connecting the slit-shaped openings extending in different directions. In addition, the aperture ratio is increased.

JP 2002-014374 A JP 2008-083386 A Japanese Patent No. 3194127

As in the horizontal electric field type liquid crystal display panel disclosed in Patent Documents 1 and 2, a slit-like opening provided with a bent portion in a sub-pixel divided by a signal line and a scanning line extending linearly in the vertical and horizontal directions Since the width of some of the electrodes is increased, an electrode region that is far away from the slit-shaped opening and does not contribute much to the generation of the electric field for driving the liquid crystal is formed, and the aperture ratio is reduced.

For this reason, as disclosed in Patent Document 3 above, the signal line or the scanning line is slit-shaped with a bent portion so that the shape of the electrode is similar to the slit-shaped opening with the bent portion. Bending was performed in parallel with the opening so that the sub-pixel had a bent shape similar to the slit-shaped opening. Here, the liquid crystal display panel 50 disclosed in Patent Document 3 will be described with reference to FIG. FIG. 8 is a plan view and a partially enlarged view of the liquid crystal display panel disclosed in Patent Document 3.

The liquid crystal display panel 50 is an FFS mode liquid crystal display panel, as shown in the partial enlarged view (a) for one sub-pixel.
Similarly to the slit-shaped opening 52, the lower electrode 53 has a bent shape. The array substrate AR has an extending portion 57 in which driver terminals 55 and flexible printed circuit board terminals 56 are disposed. The color filter substrate CF is bonded to the portion excluding the extending portion 57 of the array substrate AR. On the color filter substrate CF, a light shielding layer 58 for forming an opening in the display area by shielding the non-display area is formed.

The upper electrode 51 of the sub pixel in the display area has a slit-like opening 52 extending in the direction of the signal line 54 (Y-axis direction in FIG. 8). Note that the scanning line 59 intersects the signal line 54 (FIG. 8).
The X-axis direction extends in a straight line, and each region surrounded by the signal line 54 and the scanning line 59 in a plan view forms a sub-pixel. The slit-shaped opening 52 includes a “<”-shaped bent portion 60. The slit-shaped opening 52 extends in the positive and negative directions with respect to the direction of the rubbing process performed in the Y-axis direction of FIG. Thereby, the liquid crystal display panel 50 can reduce a change in color due to a viewing angle.

The upper electrode 51, the lower electrode 53, and the signal line 54 are also provided with a bent portion 61 and a bent portion 62 along the bent portion 60 of the slit-shaped opening 52, respectively. As a result, the slit-shaped opening 52
Since the upper electrode 51 and the signal line 54 are parallel to each other, and the region where the electric field is weakened is not formed in the upper electrode 51, the aperture ratio is higher than that of the liquid crystal display panel disclosed in Patent Documents 1 and 2 above. Get higher.

As described above, when the signal line 54 is provided with a bent portion and each subpixel has a bent portion, as shown in Patent Document 3, a color filter substrate for preventing light leakage between the subpixels. The light shielding layer 58 also includes a bent portion along the signal line 54. However, along with this, as shown in the enlarged views (b) and (c) of FIG. 8, the innermost peripheral side of the light shielding layer 58 in the non-display area forming the opening end of the display area also includes a bent portion. As a result, there arises a problem that the periphery of the display area becomes jagged. This is a problem that also occurs in the case of an IPS mode liquid crystal display panel.

The present invention has been made in view of the problems of the prior art as described above. That is, an object of the present invention is to provide an aperture in which the opening end of the display area is rectangular in a horizontal electric field type liquid crystal display panel in which the shape of each sub-pixel has a bent portion. An object is to provide a horizontal electric field liquid crystal display panel having a high rate.

In order to achieve the above object, a liquid crystal display panel according to the present invention has a pair of substrates opposed to each other with a liquid crystal layer interposed therebetween, and at least one bent portion in a display region is provided on one side of the pair of substrates. A plurality of sub-pixels having a plurality of sub-pixels are arranged in a matrix, and each of the plurality of sub-pixels has a pair of electrodes each having at least one bent portion. In a horizontal electric field type liquid crystal display panel in which a light shielding layer that shields a non-display area located between sub-pixels and on the outer periphery side of the display area is formed, the light-shielding layer of the non-display area is an outermost part of the display area. The outer peripheral side is formed into a square shape.

In the horizontal electric field type liquid crystal display panel of the present invention, a plurality of subpixels having at least one bent portion are arranged in a matrix on one side of a pair of substrates, that is, the display region on the array substrate side. Each has a pair of electrodes each having at least one bent portion. With such a configuration, the area of a region not used for display is reduced, so that a bright lateral electric field type liquid crystal display panel with a large aperture ratio can be obtained. However, on the other side of the pair of substrates, that is, the color filter substrate, a light-shielding layer that shields a non-display area located between the plurality of sub-pixels and on the outer peripheral side of the display area is formed. Since the innermost peripheral side of the light-shielding layer in the non-display area forming the opening end portion of the non-display area also has a bent portion, the periphery of the display area becomes jagged.

According to the liquid crystal display panel of the present invention, the light shielding layer in the non-display area is formed in a shape in which the outermost peripheral side of the display area has a square shape, so that the opening end of the display area has a square shape. And the periphery of the display area becomes smoother and looks better.

In the liquid crystal display panel of the present invention, a signal line and a scanning line are formed on one side of the pair of substrates, and the signal line or the scanning line is bent along the shape of the sub-pixel. be able to.

When the subpixel includes a bent portion, one of the signal line and the scanning line is bent according to the shape of the bent subpixel, and the other of the signal line and the scanning line extends linearly. Therefore, according to the liquid crystal display panel of the present invention, the pair of electrodes can be disposed up to the entire area between the signal lines and between the scanning lines, so that the aperture ratio can be improved. Note that the present invention can achieve the effects of the present invention regardless of whether the sub-pixel is bent in the column direction along the signal line or in the row direction along the scanning line. become able to.

In the liquid crystal display panel of the present invention, the light shielding layer of the non-display area is a bending point on the inner corner side of the sub pixel when the outermost side of the sub pixel located on the outermost circumference side of the display area is the inner corner side. It is preferable to be formed so as to pass through.

According to the liquid crystal display device of the present invention, the periphery of the display area can be smoothed while preventing the aperture ratio from decreasing. When the outermost side of the sub-pixel located on the outermost periphery side of the display area is the inner corner side, the light shielding layer of the non-display area shields light from the inner corner side bend point located on the outermost side of the display area to the display area side. If you do, there will be no jagged edges around the display area,
This is not preferable because many bright areas of the sub-pixel are shielded from light. Similarly, when the non-display area side is covered by the light-shielding layer of the non-display area with respect to the inflection point on the inner corner side located on the outermost side of the display area, the outer angle side of the signal line or the scanning line is exposed to the display area side. Since jagged edges appear around the display area, this is not preferable.

In the liquid crystal display panel according to the aspect of the invention, the light shielding layer of the non-display area may be located on an end point on the outer angle side of the sub pixel when the outermost side of the sub pixel located on the outermost periphery side of the display area is an outer angle side. It is preferably formed so as to pass through.

In the present invention, the “end point on the outer corner side” means a corner portion on the outer corner side among the corner portions of the four corners of each sub-pixel. Also in the liquid crystal display device of the present invention, the periphery of the display area can be smoothed while preventing the aperture ratio from being lowered. When the outermost side of the sub-pixel located on the outermost periphery side of the display area is the outer corner side, the light shielding layer of the non-display area shields the display area side beyond the outer corner end point located on the outermost side of the display area. In this case, the display area is not jagged, but it is not preferable because many bright areas of each sub-pixel are shielded from light.
Similarly, when the non-display area side is shielded from the outer-angle end point located on the outermost side of the display area by the light-shielding layer of the non-display area, the inner angle side of the signal line or the scanning line is exposed to the display area side, Since jagged edges appear around the display area, it is not preferable.

In the liquid crystal display panel of the present invention, it is preferable that the outermost sub-pixel of the display region has a larger area than the other sub-pixels.

If the sub-pixel on the outermost peripheral side of the display area is covered with the light shielding layer of the non-display area, the area of the opening of the sub-pixel on the outermost peripheral side of the display area becomes small. According to the liquid crystal display device of the present invention, the outermost sub-pixel of the display area has a larger area than the other sub-pixels, so that the outermost sub-pixel of the display area is shielded from the non-display area. Even if it is covered with a layer, the area of the opening can be made the same as that of the other sub-pixels, so that the sub-pixels on the outermost peripheral side of the display region are suppressed from becoming dark.

In the liquid crystal display panel of the present invention, it is preferable that dummy pixels are formed outside the display area, and the dummy pixels are in a non-driven state.

The dummy pixel can be operated as an electrostatic protection circuit, for example, by simulating the same configuration as the sub-pixel. In a horizontal electric field type liquid crystal display panel, a liquid crystal on the outer peripheral side of the sub-pixel on the outermost peripheral side of the display region is not driven, so that a domain (alignment failure) occurs. According to the liquid crystal display panel of the present invention, it is possible to make the domain generated on the outer peripheral side of the sub-pixel on the outermost peripheral side of the display area invisible by the light shielding layer in the non-display area. Therefore, according to the liquid crystal display panel of the present invention, even if dummy pixels are provided, the display image quality of the sub-pixels on the outermost peripheral side of the display area is reduced.

In the liquid crystal display panel of the present invention, the pair of electrodes includes a lower electrode, an insulating film formed on the lower electrode, and a slit formed on the insulating film and bent along the shape of the sub-pixel. And an upper electrode in which an aperture is formed.

According to the liquid crystal display panel of the present invention, an FFS mode liquid crystal display panel having the effects of the present invention can be obtained.

In the liquid crystal display panel of the present invention, the pair of electrodes may be arranged to oppose each other in a comb shape and bend along the shape of the sub-pixel.

According to the liquid crystal display panel of the present invention, an IPS mode liquid crystal display panel having the effects of the present invention can be obtained.

It is a top view which shows the display area of the liquid crystal display panel of 1st Embodiment. It is an enlarged view of the II part of FIG. It is sectional drawing of the III-III line of FIG. It is sectional drawing of the IV-IV line of FIG. It is a top view which shows the liquid crystal display panel of 2nd Embodiment. It is a top view which shows the liquid crystal display panel of 3rd Embodiment. It is a top view which shows the liquid crystal display panel of 4th Embodiment. It is a top view which shows the display area of the conventional liquid crystal display panel.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, taking the case of an FFS mode horizontal electric field liquid crystal display panel as an example. However, the embodiments described below are not intended to limit the present invention to those described herein, and the present invention has been variously modified without departing from the technical idea shown in the claims. It can be equally applied to things. In each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions.

[First Embodiment]
The structure of the principal part of the liquid crystal display panel 10 of 1st Embodiment is demonstrated using FIGS. 1-4. The liquid crystal display panel 10 operates in the FFS mode and has a plurality of sub-pixels 11 arranged in a matrix. As shown in FIG. 3 and FIG.
A liquid crystal layer LC is sandwiched between the array substrate AR and the color filter substrate CF. The array substrate AR is based on a first transparent substrate 12 made of transparent insulating glass, quartz, plastic or the like. On the first transparent substrate 12, scanning lines 13 made of opaque metal such as aluminum or molybdenum are formed in the X-axis direction (row direction) in FIG. 2 on the side facing the liquid crystal layer LC. From the scanning line 13, the gate electrode G is extended to, for example, the lower left of each subpixel 11.

A transparent gate insulating film 14 made of silicon nitride, silicon oxide or the like is laminated so as to cover the scanning line 13 and the gate electrode G. A semiconductor layer 15 made of amorphous silicon, polycrystalline silicon, or the like is formed on the gate insulating film 14 overlapping the gate electrode G in plan view. A plurality of signal lines 16 made of a metal such as aluminum or molybdenum are formed on the gate insulating film 14 in the Y-axis direction (column direction) in FIG. Each of the areas partitioned by these scanning lines 13 and signal lines 16 becomes a sub-pixel area. This signal line 16
The source electrode S extends from the source electrode S and is in partial contact with the surface of the semiconductor layer 15.

Furthermore, the drain electrode D formed simultaneously with the same material as the signal line 16 and the source electrode S.
Is provided on the gate insulating film 14, and the drain electrode D is disposed close to the source electrode S and is in partial contact with the surface of the semiconductor layer 15. Three sub-pixels of R (red), G (green), and B (blue) constitute one substantially square pixel (not shown), and the sub-pixel 11 that divides this into three equal parts is short on the scanning line 13 side. The side of the signal line 16 is a long side rectangle. The gate electrode G, the gate insulating film 14, the semiconductor layer 15, the source electrode S, and the drain electrode D constitute a thin film transistor TFT serving as a switching element, and the TFT is formed in each subpixel 11.

Further, a transparent passivation film 17 made of, for example, silicon nitride or silicon oxide is laminated so as to cover the exposed portions of the signal line 16, the thin film transistor TFT, and the gate insulating film 14. An interlayer resin film 18 made of a transparent resin material such as a photoresist is laminated so as to cover the passivation film 17. And interlayer resin film 1
A lower electrode 19 made of a transparent conductive material such as ITO (Indium Thin Oxide) or IZO (Indium Zinc Oxide) is formed so as to cover 8. A contact hole 20 that reaches the drain electrode D through the first interlayer resin film 18 and the passivation film 17 is formed, and the lower electrode 19 and the drain electrode D are electrically connected through the contact hole 20. Yes. Therefore, the lower electrode 19 operates as a pixel electrode.

A transparent interelectrode insulating film 21 made of, for example, silicon nitride or silicon oxide is laminated so as to cover the lower electrode 19. Then, ITO or I is formed so as to cover the interelectrode insulating film 21.
An upper electrode 22 made of a transparent conductive material such as ZO is formed. In the liquid crystal display device 10 of the first embodiment, the upper electrode 22 is connected to a common wiring (not shown) at the periphery of the display area and operates as a common electrode. The liquid crystal display panel 10 may be configured such that the upper electrode is operated as a pixel electrode and the lower electrode is operated as a common electrode.

As shown in FIG. 2, the upper electrode 22 has a plurality of slit-like openings 23. The slit-shaped opening 23 is formed by exposing and developing a photoresist material applied to the surface of the upper electrode 22 by photolithography and then etching. The specific shape and the like of the slit opening 23 will be described later. A first alignment film 24 made of polyimide is laminated so as to cover the upper electrode 22. The first alignment film 24 is subjected to a liquid crystal orientation process, that is, a rubbing process in the Y-axis direction of FIG. 2 (a direction substantially parallel to the extending direction of the signal line 16).

The color filter substrate CF is based on a second transparent substrate 25 made of transparent insulating glass, quartz, plastic, or the like. The second transparent substrate 25 is formed with a light shielding layer 26 and a color filter layer 27 that transmits light of different colors (for example, R (red), G (green), and B (blue)) for each subpixel. . The light shielding layer 26 includes the scanning line 13, the signal line 16, and the TF in the display area.
T is formed in a portion that overlaps the drain electrode D in a plan view and a portion that covers the non-display area of the second transparent substrate 25 in order to form an opening in the display area. Here, the display area is an area in which an image that can be visually recognized by the user is substantially displayed.

A color filter layer 27 is formed in a region of the subpixel 11 where the light shielding layer 26 is not formed. An overcoat layer 28 made of a transparent resin material such as a photoresist is laminated so as to cover the light shielding layer 26 and the color filter layer 27. This overcoat layer 28 flattens the level difference caused by the color filter layers 27 of different colors, and the light shielding layer 26.
Further, it is formed to block impurities flowing out from the color filter layer 27 from entering the liquid crystal layer LC. A second alignment film 29 made of polyimide is formed so as to cover the overcoat layer 28. The second alignment film 29 is subjected to a rubbing process in the direction opposite to that of the first alignment film 24.

The array substrate AR and the color filter substrate CF thus formed are opposed to each other, a sealing material (not shown) is provided around both substrates, and the substrates are bonded together, and liquid crystal is filled between the substrates. Thus, the liquid crystal display panel 10 according to the first embodiment is obtained. A spacer (not shown) for holding the liquid crystal layer LC at a predetermined thickness is formed on the color filter substrate CF. The array substrate AR has an extending portion 32 in which driver terminals 30 and flexible printed circuit board terminals 31 are disposed. Extension part 3 of array substrate AR
The color filter substrate CF is attached to the portion excluding 2.

With the configuration described above, when a TFT is turned on and a voltage is applied between the lower electrode 19 and the upper electrode 22, an electric field is generated between the electrodes 19 and 22, and the alignment direction of the liquid crystal molecules in the liquid crystal layer LC is changed. Change. As a result, the light transmittance of the liquid crystal layer LC changes and an image is displayed. In addition,
A storage capacitor is incidentally formed by the lower electrode 19, the upper electrode 22, and the interelectrode insulating film 21, and the TFT
When is turned off, the electric field between the electrodes 19 and 22 can be held for a predetermined time.

Next, the slit-shaped opening 23 formed in the upper electrode 22 will be described in detail with reference to FIG. In the FFS mode liquid crystal display panel 10, the electric field is generated by a potential difference between the upper electrode 22 and the lower electrode 19 positioned below the slit-like opening 23. The electric field is generated substantially parallel to the surface of the array substrate AR, and the direction of the electric field in plan view is the normal direction of the side of the slit-shaped opening 23. At both ends of the slit-shaped opening 23, the electric field direction is different from the electric field direction of the long side portion of the slit-shaped opening 23, so that a reverse twist domain is generated. This reverse twist domain
Since normal display cannot be performed, the aperture ratio is reduced.

Moreover, since the area | region for closing the slit-shaped opening 23 exists in the both ends vicinity of the slit-shaped opening 23, an aperture ratio falls further. Since the sub-pixels 11 in the liquid crystal display panel 10 of the present embodiment are vertically long, the number of ends of the slit-shaped openings 23 increases when the slit-shaped openings 23 extend in the horizontal direction. Therefore, in the liquid crystal display panel 10 of the present embodiment, as shown in FIG. 2, the extending direction of the slit-shaped opening 23 is the extending direction of the signal line 16 (Y-axis direction in FIG. 2).
By doing so, the number of end portions of the slit-like opening 23 is reduced, so that the aperture ratio is not lowered.

The extending direction of the slit-shaped opening 23 is inclined by a predetermined angle (for example, about 5 degrees to about 15 degrees) with respect to the rubbing process direction. Thereby, the liquid crystal molecules can be rotated in the same direction. When all the slit-like openings 23 are clockwise or counterclockwise, the liquid crystal molecules are twisted in the same direction, so that a phenomenon that the color changes depending on the viewing angle direction appears. This is because the apparent retardation changes depending on the direction of viewing the liquid crystal molecules. In order to reduce this, the liquid crystal display panel 10 of the present embodiment is provided with two domains in which the extending direction of the slit-like opening 23 is inclined in the positive and negative directions with respect to the clockwise direction. That is, it is multi-domain.

When the slit-shaped openings 23 of domains having different orientation directions are separated, the slit-shaped openings 23
Since the end of the area increases, the area of the area that cannot be normally displayed increases, and the aperture ratio decreases. Therefore, in the liquid crystal display panel 10 of the present embodiment, as shown in FIG. 2, the bent portions 33 are provided in the slit-shaped openings 23 to form a “<” shape, and domains having different orientation directions are connected. The bent portion 33 of the slit-shaped opening 23 includes an inner angle side bent portion 33a formed on the inner angle side and an outer angle side bent portion 33b formed on the outer angle side. By bending the slit-shaped opening 23 in a “<” shape in this way, the area of a region that cannot be normally displayed is reduced as compared with the case where the slit-shaped opening 23 is separated, so that the aperture ratio can be increased. become.

For the reason described above, in the liquid crystal display panel 10 of the present embodiment, the upper electrode 22 also extends in the extending direction of the signal line 16 (Y-axis direction in FIG. 2), and a “<” is formed by providing a bent portion 34. It is formed in a shape. The bent portion 34 of the upper electrode 22 is also an inner angle side bent portion 34a formed on the inner angle side.
And an outer angle side bent portion 34b formed on the outer angle side. Further, the signal line 16 is also formed in a “<” shape by providing a bent portion 35. A bent portion 35 of the signal line 16
The inner angle side bent portion 35a is formed on the inner angle side and the outer angle side bent portion 35b is formed on the outer angle side. As a result, the signal line 16 and the upper electrode 22 are parallel to the slit-shaped opening 23, so that there is no region where the electric field strength is weak as in the liquid crystal display panel disclosed in Patent Document 3, so that the luminance is reduced. Can be prevented.

Since the liquid crystal display panel 10 of this embodiment has the above-described configuration, each sub-pixel 11 including a region surrounded by the signal lines 16 and the scanning lines 13 in a plan view is bent in a “<” shape. It has a different shape. The bending point on the inner corner side of each sub-pixel 11 is Ea,
Of the four corners of each sub-pixel 11, the corner on the outer corner is defined as an end point Eb.

Since the bent portion 35 is formed in the signal line 16, the light shielding layer 26 that overlaps the signal line 16 in the display region in plan view is also bent along the bent portion 35 of the signal line 16. However, FIG.
As shown in FIG. 3, the light shielding layers 26a and 26b in the non-display area that form the opening of the rectangular display area
Is not bent but is formed in a straight line. That is, in the liquid crystal display panel 10 of the first embodiment, in the sub-pixel 11a (the right end in FIG. 2) in which the outermost side of the sub-pixel 11 positioned on the outermost peripheral side of the display region is the inner corner side, the light-shielding layer of the non-display region The sub-pixel 11 by 26a
The light is shielded from the bending angle Ea on the inner corner side of a to the display area side. Further, in the sub pixel 11b (the left end in FIG. 2) whose outermost side is the outermost side of the sub pixel 11 located on the outermost peripheral side of the display region, the outer end Eb of the sub pixel 11b is blocked by the light shielding layer 26b of the non-display region. The light is shielded beyond the display area.

Thereby, the signal line 1 formed on the sub-pixels 11a and 11b side at both ends of the display area.
6 is shielded by the light shielding layers 26a and 26b in the non-display area, so that no jaggedness appears in the display area and the periphery of the display area can be smoothed.

[Second Embodiment]
Next, a liquid crystal display panel 10A of the second embodiment will be described with reference to FIG. However, in FIG. 5, the same reference numerals are given to the same components as those of the liquid crystal display panel 10 of the first embodiment, and the detailed description thereof is omitted. The difference between the liquid crystal display panel 10A of the second embodiment and the case of the first embodiment is the size of the light shielding layer 26 in the non-display area that forms the opening of the display area.

That is, in the liquid crystal display panel 10 of the first embodiment, as shown in FIG. 2, in the sub-pixel 11a (the right end in FIG. 2) where the outermost side of the sub-pixel 11 located on the outermost peripheral side of the display area is the inner corner side. The light shielding layer 26a in the non-display area is shielded from the inner corner side bending point Ea of the sub-pixel 11a to the display area side. Further, the sub-pixel 11 located on the outermost peripheral side of the display area
In the sub-pixel 11b (the left end in FIG. 2) whose outermost side is the outer-angle side, the light-shielding layer 26b in the non-display area is shielded from the end-point Eb on the outer-angle side of the sub-pixel 11b to the display area side. With such a configuration, the periphery of the display area can be smoothed even if there is an overlay error or a manufacturing error between the array substrate AR and the color filter substrate CF.

However, in the liquid crystal display panel 10 of the first embodiment, the display area is shielded by the light shielding layers 26a and 26b in the non-display area. It will be darker than the brightness of the sub-pixel. Therefore, in the liquid crystal display panel 10A of the second embodiment, the outermost sub-pixel is brightest in a state where no jaggedness is generated around the display area.

That is, in the liquid crystal display panel 10A of the second embodiment, when the subpixel located on the outermost peripheral side of the display region is the subpixel 11a whose outermost side is the inner corner side, the light shielding layer 26a in the non-display region is the subpixel 11a. It is formed so as to pass over the bending point Ea on the inner angle side. In addition, when the sub-pixel located on the outermost peripheral side of the display area is the sub-pixel 11b whose outermost side is the outer angle side,
The light-shielding layer 26a in the non-display area is formed so as to pass over the end point Eb on the outer corner side of the sub-pixel.

According to the liquid crystal display panel 10A of the second embodiment having such a configuration, the signal lines 16 are shielded from light by the light shielding films 26a and 26b, so that no jaggedness occurs around the display area. In addition, according to the liquid crystal display device 10A of the second embodiment, if the light shielding layers 26a and 26b in the non-display area are further covered on the display area side, no jagged edges appear around the display area, but the aperture area of the subpixels Will darken to decrease. On the contrary, if the light shielding layers 26a and 26b in the non-display area are further retracted to the non-display area side, the aperture area of the sub-pixel is increased and the sub-pixel opening area becomes brighter. However, the signal line 16 appears around the display area. , Jaggedness will occur.

Therefore, according to the liquid crystal display device 10A of the second embodiment shown in FIG. 5, the brightest state is obtained even though the jaggedness is not generated around the display area. In the liquid crystal display panel of the second embodiment, the sub-pixels 11a and 11b on the outermost peripheral side are in a state where no jaggedness is generated in the periphery of the display region, but the brightest state is obtained. Both do not need to be in this state. That is, the same configuration as that of the liquid crystal display panel 10A of the second embodiment is adopted only on one side of the outermost subpixels 11a and 11b, and the other side is the same as that of the liquid crystal display panel 10 of the first embodiment. The configuration may be adopted.

[Third Embodiment]
Next, a liquid crystal display panel 10B according to a third embodiment will be described with reference to FIG. However, in FIG. 6, the same reference numerals are given to the same components as those of the liquid crystal display panel 10 of the first embodiment, and detailed description thereof will be omitted. The liquid crystal display panel 10B according to the third embodiment is different from the liquid crystal display panel 10 according to the first embodiment in that the subpixel 1 on the outermost peripheral side of the display area is different.
The size is 1a and 11b.

In the liquid crystal display panel 10 of the first embodiment, as shown in FIG. 2, the sub-pixels 11 have the same size, including the sub-pixels 11 a and 11 b on the outermost peripheral side of the display area. On the other hand, in the liquid crystal display panel 10B of the third embodiment, as shown in FIG. 6, the width of the sub-pixels 11 other than both ends of the display region is WM, and the width of the right-end sub-pixel 11a is wider than WM. WR
(WR> WM) and the width of the leftmost sub-pixel 11b is WL (WL> WM) wider than WM.

With such a configuration, in order to eliminate the jaggedness of the sub-pixels 11a and 1b in the periphery of the display area, the display area side may be covered with the light shielding layers 26a and 26b in the non-display area. The opening areas of the peripheral sub-pixels 11a and 11b can be made the same as the opening areas of the sub-pixels 11 in other portions. Therefore, according to the liquid crystal display panel 10B of the third embodiment, the sub-pixels 11a and 11b in the peripheral part of the display area are not jagged, and the aperture ratio of the sub-pixels 11a and 11b in the peripheral part of the display area. Can be made to be the same as the aperture ratio of the sub-pixels 11 in other portions, so that it is possible to suppress poor color development and a reduction in brightness in the peripheral portion.

[Fourth Embodiment]
Next, a liquid crystal display panel 10C according to a fourth embodiment will be described with reference to FIG. However, in FIG. 7, the same reference numerals are given to the same components as those of the liquid crystal display panel 10 of the first embodiment, and the detailed description thereof is omitted. The difference between the liquid crystal display panel 10C of the fourth embodiment and the liquid crystal display panel 10 of the first embodiment is the presence or absence of dummy pixels in the non-display area.

As shown in FIG. 7, in the liquid crystal display panel 10C of the fourth embodiment, in the non-display area covered with the light shielding layer 26, dummy pixels 36 are disposed adjacent to the outer peripheral side of the sub-pixels in the display area. ing. The dummy pixel 36 has the same configuration as that of the sub-pixel 11 in the display area, but unlike the sub-pixels 11, 11a and 11b in the display area, an electric field is not applied to the liquid crystal layer LC. This dummy pixel 36 is used, for example, for simulating the same configuration as the sub-pixel, forming a dummy pixel static electricity protection circuit, and forming a protection means from static electricity entering from the outside.

As described above, when a region to which an electric field is applied and a region to which no electric field is applied are adjacent to each other at the boundary between the display region and the non-display region, the orientation of the display region to which the electric field is applied is disturbed. Defective) will occur. However, the liquid crystal display panel 10 of the fourth embodiment.
In C, since the domains generated further on the outer peripheral side of the sub-pixels 11a and 11b on the outermost peripheral side of the display region can be made invisible by the light shielding layers 26a and 26b in the non-display region, the display image quality is adversely affected. No more giving.

In the above embodiment, the FFS includes one bent portion that is bent in a “<” shape in the sub-pixel.
Although an example of a mode liquid crystal display panel is shown, the present invention can also be applied to an FFS mode liquid crystal display panel in which a plurality of bent portions are provided in a sub-pixel in a zigzag manner. Further, in the above-described embodiment, an example of an FFS mode liquid crystal display panel in which one bent portion that is bent in a “<” shape along the signal line is shown as a sub-pixel. It can also be applied to an FFS mode liquid crystal display panel having a single bent portion or a plurality of bent portions in a zigzag shape. Furthermore, in the above embodiment, F
Although an example of an FS mode liquid crystal display panel has been shown, the present invention is also applicable to an IPS mode liquid crystal display panel.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display panel 11, 11a, 11b ... Sub pixel 12 ... 1st transparent substrate 13
... Scanning line 14 ... Gate insulating film 15 ... Semiconductor layer 16 ... Signal line 17 ... Passivation film 18 ... Interlayer resin film 19 ... Lower electrode 20 ... Contact hole 21 ... Interelectrode insulating film 22 ... Upper electrode 23 ... Slit-like opening 24 ... First alignment film 25 ... second transparent substrate 26
... light-shielding layer 27 ... color filter layer 28 ... overcoat layer 29 ... second alignment film 3
DESCRIPTION OF SYMBOLS 0 ... Driver terminal 31 ... Flexible printed circuit board terminal 32 ... Extension part 33 ... Bending part of slit-like opening 33a ... Inner side bending part of slit-like opening 33b ... Outer corner side bending part of slit-like opening 34 ... Upper electrode Bending portion 34a ... Inner angle side bending portion of upper electrode 34b ... Outer angle side bending portion of upper electrode 35 ... Bending portion of signal line 35a ... Inner angle side bending portion of signal line 35b ...
Signal line outer corner side bent portion 36 ... Dummy pixel AR ... Array substrate CF ... Color filter substrate LC ... Liquid crystal layer Ea ... Sub pixel inner corner side bent portion Eb ... Sub pixel outer corner side end point

Claims (8)

Having a pair of substrates disposed opposite to each other with a liquid crystal layer sandwiched therebetween,
On one side of the pair of substrates, a plurality of subpixels having at least one bent portion in a display area are arranged in a matrix, and each of the plurality of subpixels has a pair of electrodes having at least one bent portion. Formed,
On the other side of the pair of substrates, a light-shielding layer that shields a non-display area located between the plurality of sub-pixels and on the outer peripheral side of the display area is formed.
In a horizontal electric field type liquid crystal display panel,
The liquid crystal display panel, wherein the light shielding layer in the non-display area is formed in a shape in which the outermost peripheral side of the display area is rectangular. 2. The liquid crystal according to claim 1, wherein a signal line and a scanning line are formed on one side of the pair of substrates, and the signal line or the scanning line is bent along the shape of the sub-pixel. Display panel. The light-shielding layer of the non-display area is formed so as to pass over a bending point on the inner corner side of the sub pixel when the outermost side of the sub pixel located on the outermost circumference side of the display area is the inner corner side. The liquid crystal display panel according to claim 2. The light-shielding layer in the non-display area is formed so as to pass over an end point on the outer angle side of the sub pixel when the outermost side of the sub pixel located on the outermost periphery side of the display area is on the outer angle side. The liquid crystal display panel according to claim 2. The liquid crystal display panel according to claim 1, wherein an area of the sub-pixel on the outermost peripheral side of the display area is larger than that of other sub-pixels. The liquid crystal display panel according to claim 1, wherein dummy pixels are formed outside the display area, and the dummy pixels are not driven. The pair of electrodes includes a lower electrode, an insulating film formed on the lower electrode, and an upper electrode formed on the insulating film and formed with a slit-like opening bent along the shape of the sub-pixel. The liquid crystal display panel according to claim 1, comprising: The liquid crystal display panel according to claim 1, wherein the pair of electrodes are arranged to oppose each other in a comb shape and are bent along the shape of the sub-pixel. .

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