JP5143504B2 - Liquid crystal display - Google Patents

Description

The present technology relates to a liquid crystal display device, and more particularly to a transflective liquid crystal display device in which a display operation is performed in a horizontal electric field mode and a reflective display region and a transmissive display region are provided in one pixel.

Conventionally, a transflective liquid crystal display device including a plurality of pixels provided with two display areas of a reflective display area and a transmissive display area is known (see, for example, Patent Document 1). Further, conventionally, a liquid crystal display device adopting a horizontal electric field method in which a liquid crystal molecule is driven by a horizontal electric field generated in a liquid crystal layer to perform a display operation is also known.

FIG. 9 is a cross-sectional view schematically showing an example of the structure of a transflective liquid crystal display device employing a conventional lateral electric field method. First, the structure of a transflective liquid crystal display device employing a conventional lateral electric field method will be described with reference to FIG.

As shown in FIG. 9, a conventional transflective liquid crystal display device adopting a horizontal electric field system includes a plurality of pixels provided with two display areas, a reflective display area 100a and a transmissive display area 100b. FIG. 9 shows a structure for one pixel.

As a specific structure, the conventional liquid crystal display device includes at least a liquid crystal layer 101, and a TFT substrate 102 and a CF substrate 103 arranged to face each other with the liquid crystal layer 101 interposed therebetween. Although not shown, the TFT substrate 102 includes a thin film transistor (T
FT) and the like, and the CF substrate 103 is provided with a color filter (CF) and the like.

A liquid crystal driving electrode 104 for generating a lateral electric field for driving the liquid crystal molecules of the liquid crystal layer 101 is formed on the front surface side (the liquid crystal layer 101 side) of the TFT substrate 102. Although not shown, the liquid crystal drive electrode 104 includes a common electrode and a pixel electrode formed on the front surface of the common electrode via an interlayer insulating film. In the display operation, the liquid crystal molecules of the liquid crystal layer 101 are driven by an electric field E generated between the common electrode included in the liquid crystal driving electrode 104 and the pixel electrode. A reflective film 10 for reflecting the light incident on the liquid crystal layer 101 is formed in a region corresponding to the reflective display region 100 a on the front surface of the TFT substrate 102.
5 is formed.

Further, a convex adjustment layer 106 for adjusting the thickness of the liquid crystal layer 101 is formed in a region corresponding to the reflective display region 100a on the surface on the back side (the liquid crystal layer 101 side) of the CF substrate 103. . The thickness of the adjustment layer 106 is adjusted so that the thickness of the liquid crystal layer 101 in the reflective display region 100a is approximately half the thickness of the liquid crystal layer 101 in the transmissive display region 100b.

In the conventional configuration provided with the convex adjustment layer 106 as described above, the optical path length of the external light L101 incident on the reflective display region 100a in the liquid crystal layer 101 and the liquid crystal layer of the external light L102 incident on the transmissive display region 100b. The optical path length at 101 can be made substantially the same.

JP 2007-47833 A

However, in the conventional configuration described above, when the convex adjustment layer 106 for adjusting the thickness of the liquid crystal layer 101 is provided, the stepped portion 107 on the CF substrate 103 side formed by the adjustment layer 106 has a liquid crystal layer. This causes the alignment disorder of the liquid crystal molecules 101. Therefore, a region corresponding to the stepped portion 107 on the CF substrate 103 side formed by the adjustment layer 106 (
When liquid crystal molecules located in a region surrounded by a broken line in FIG. 9 are driven, there is a disadvantage that the alignment of the liquid crystal molecules is disturbed. As a result, the conventional liquid crystal display device has a problem that its display quality is lowered.

This technique has been made to solve the above problems, the purpose of this technique is to provide a liquid crystal display device which can suppress deterioration of display quality.

In order to achieve the above object, a liquid crystal display device according to an aspect of the present technology is a transflective type in which a display operation is performed in a horizontal electric field mode, and a reflective display region and a transmissive display region are provided in one pixel. A first substrate and a second substrate arranged to face each other with a liquid crystal layer interposed therebetween, a first electrode formed on a surface of the first substrate on the liquid crystal layer side, The liquid crystal molecules of the liquid crystal layer are formed on the surface of the one electrode on the liquid crystal layer side, have slits for controlling the alignment of the liquid crystal molecules of the liquid crystal layer, and generate an electric field with the first electrode. A second electrode for driving the liquid crystal and a region corresponding to the reflective display region on the liquid crystal layer side surface of the second substrate, and the thickness of the liquid crystal layer in the reflective display region is smaller than the thickness of the liquid crystal layer in the transmissive display region A convex adjustment layer for adjustment to be Provided, the slits are arranged one by plurality in each of the region corresponding to the region and the transmissive display area corresponding to the reflective display region, the region corresponding to the reflective display area, a first slit group including each a predetermined number of slits And a second slit group, and the region corresponding to the transmissive display region has a third slit group and a fourth slit group each including a predetermined number of slits, and the first slit group and the second slit group 3 of slit group, and a second slit group and the fourth slit group are adjacent across the step portion of the second substrate which is formed by the adjustment layer, when seen in a plan view, the second electrode in a region inside the end region, and slits edges, with and a step difference portion is configured to non-overlapping, between the first slit group and the second slit group, and a third Slit group and 4th sleeve The inclination of the slits differs between the first slit group and the third slit group, and the inclination of the slit between the second slit group and the fourth slit group. Each is different. With such a configuration, each of the reflective display region and the transmissive display region has a multi-domain structure, so that it is possible to suppress deterioration in display quality while improving the viewing angle.

In the liquid crystal display device according to this aspect, as described above, when viewed in a plan view, at least in the region inside the end region of the second electrode, by the edge of the slit of the second electrode and the adjustment layer By configuring the step portion on the second substrate side to be formed so as not to overlap each other, the electric field for driving the liquid crystal molecules of the liquid crystal layer is first so as to straddle the edge of the slit of the second electrode.
Since it occurs between the electrode and the second electrode, it is possible to suppress the generation of an electric field that drives liquid crystal molecules in a region corresponding to the stepped portion on the second substrate side formed by the adjustment layer. As a result, even if the step portion on the second substrate side formed by the adjustment layer causes the alignment of the liquid crystal molecules to be disturbed, it is located in a region corresponding to the step portion on the second substrate side formed by the adjustment layer. Since the liquid crystal molecules to be driven are not substantially driven, it is possible to suppress the disadvantage that the alignment of the liquid crystal molecules is disturbed. As a result, it is possible to prevent the display quality of the liquid crystal display device from deteriorating.

In the liquid crystal display device according to the above aspect, when viewed in a plane, at least in a region inside the end region of the second electrode, in the portion where the slit of the second electrode is not formed, by the adjustment layer The step portion on the second substrate side to be formed may be accommodated. According to this structure, when viewed in a plan view, at least in the region inside the end region of the second electrode, the edge of the slit of the second electrode and the second substrate side formed by the adjustment layer It can suppress easily that a level | step difference part mutually overlaps.

In this case, as viewed in a plan view, the center of the step portion on the second substrate side formed by the adjustment layer in the predetermined direction and the portion of the second electrode in which the step portion is accommodated are not formed in the predetermined direction. It is preferable that the centers coincide with each other.

In the liquid crystal display device according to the above aspect, when viewed in plan, the adjustment layer is formed in the opening of the slit of the second electrode at least in a region inside the end region of the second electrode. The step portion on the two substrate side may be accommodated. According to this structure, when viewed in a plan view, at least in the region inside the end region of the second electrode, the edge of the slit of the second electrode and the second substrate side formed by the adjustment layer It can suppress easily that a level | step difference part mutually overlaps.

In this case, in plan view, the center in the predetermined direction of the step portion on the second substrate side formed by the adjustment layer and the center in the predetermined direction of the slit of the second electrode in which the step portion is accommodated coincide with each other. It is preferable.

As described above, according to the present technology , it is possible to easily obtain a liquid crystal display device capable of suppressing deterioration in display quality while improving the viewing angle .

(First embodiment)
FIG. 1 is a cross-sectional view showing the structure of the liquid crystal display device according to the first embodiment of the present technology . FIG. 2 is a plan view of a pixel electrode (second electrode) provided in the liquid crystal display device according to the first embodiment shown in FIG. First, the structure of the liquid crystal display device according to the first embodiment will be described with reference to FIGS. The liquid crystal display device according to the first embodiment is used for, for example, a mobile phone or a car navigation system.

As shown in FIG. 1, the liquid crystal display device of the first embodiment includes a plurality of pixels provided with two display areas, a reflective display area 11 a and a transmissive display area 11 b. That is, the liquid crystal display device of the first embodiment is a transflective liquid crystal display device. FIG. 1 shows a structure for one pixel.

By the way, the reflection display mode is a mode in which display is performed by reflecting external light (for example, sunlight) L1 incident on a liquid crystal layer 1 described later from the front side of the liquid crystal display device.
On the other hand, the transmissive display mode is a mode in which display is performed by transmitting external light (for example, backlight light) L2 incident on the liquid crystal layer 1 from the back side of the liquid crystal display device.

As a specific structure, the liquid crystal display device of the first embodiment includes at least a liquid crystal layer 1 and a pair of transparent substrates 2 and 3 disposed so as to face each other with the liquid crystal layer 1 interposed therebetween. . The transparent substrates 2 and 3 are examples of the “first substrate” and the “second substrate” in the present technology , respectively.

A thin film transistor (not shown) for switching control of a pixel electrode 6 to be described later is formed on the front surface side (liquid crystal layer 1 side) of one transparent substrate 2. The thin film transistor is covered with, for example, an interlayer insulating film (not shown), and is connected to the pixel electrode 6 through a contact hole (not shown) formed in the interlayer insulating film.

A liquid crystal driving electrode for driving the liquid crystal molecules of the liquid crystal layer 1 is formed on the front surface of the transparent substrate 2. This liquid crystal drive electrode is composed of a common electrode 4 made of a transparent conductive film such as an ITO film, and a transparent conductive film such as an ITO film formed on the front surface of the common electrode 4 via an interlayer insulating film 5. And a pixel electrode 6. The common electrode 4 and the pixel electrode 6 are examples of the “first electrode” and the “second electrode” in the present technology , respectively.

As shown in FIGS. 1 and 2, the pixel electrode 6 has a plurality of slits 6 a for controlling the alignment of the liquid crystal molecules of the liquid crystal layer 1. A plurality of slits 6a of the pixel electrode 6
Each is formed in an elongated shape when seen in a plan view. When performing the display operation, the liquid crystal molecules in the liquid crystal layer 1 are driven by an electric field generated between the common electrode 4 and the pixel electrode 6 so as to straddle the edge 6b of the slit 6a of the pixel electrode 6. That is, the liquid crystal display device according to the first embodiment is a liquid crystal display device that employs a horizontal electric field method in which a liquid crystal molecule is driven by a horizontal electric field generated in the liquid crystal layer 1 to perform a display operation.

As shown in FIG. 1, a reflective film 7 for reflecting light incident on the liquid crystal layer 1 is formed in a region corresponding to the reflective display region 11 a on the front surface of the common electrode 4. . By providing such a reflective film 7 in the reflective display area 11a, when external light L1 from the front side of the liquid crystal display device enters the reflective display area 11a, the external light L1 is reflected by the reflective film 7. Become. On the other hand, since the reflection film 7 as described above is not provided in the transmissive display region 11b, when the external light L2 from the back side of the liquid crystal display device enters the transmissive display region 11b, the external light L2 is transmitted. It will be.

Further, a color filter 8 for displaying a color image is formed on the surface on the back side (liquid crystal layer 1 side) of the other transparent substrate 3, and on the surface on the front side of the color filter 8. The convex adjustment layer 9 is formed. The adjustment layer 9 makes the optical path length of the external light L1 incident on the reflective display region 11a in the liquid crystal layer 1 substantially the same as the optical path length of the external light L2 incident on the transmissive display region 11b in the liquid crystal layer 1. It has a function. Specifically, the adjustment layer 9 is
It is not provided in the transmissive display area 11b and is provided only in the reflective display area 11a.
The thickness of the adjustment layer 9 is adjusted so that the thickness of the liquid crystal layer 1 in the reflective display region 11a is about half of the thickness of the liquid crystal layer 1 in the transmissive display region 11b.

By the way, in the structure of 1st Embodiment provided with the above convex adjustment layers 9, the level | step-difference part 10 formed with the adjustment layer 9 will be provided in the transparent substrate 3 side. And
As shown in FIG. 1 and FIG. 2, the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 is a reflective display so as to divide the reflective display region 11a and the transmissive display region 11b in a plan view. Arranged along the boundary between the region 11a and the transmissive display region 11b. The reflective display area 11
A boundary line that separates a from the transmissive display area 11b (hereinafter simply referred to as a boundary line) is A
It extends along the direction (the short side direction of the pixel).

Here, in the first embodiment, the slits of the pixel electrode 6 at least in a region inside the end region of the pixel electrode 6 (region surrounded by a broken line in FIG. 2) when viewed in plan. 6
The edge 6b of a and the step part 10 on the transparent substrate 3 side formed by the adjustment layer 9 are configured not to overlap each other.

Specifically, in the first embodiment, when viewed in a plan view, the slit 6a is not formed in the portion 6c positioned near the boundary line of the pixel electrode 6, and the pixel electrode 6 is positioned near the boundary line. The slit 6a is divided at the portion 6c. When viewed in a plan view, at least a portion located near the boundary line of the pixel electrode 6 in a region inside the end region of the pixel electrode 6 (region surrounded by a broken line in FIG. 2) ( A step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 is housed in a portion 6c of the pixel electrode 6 where the slit 6a is not formed. Furthermore, in the first embodiment, the B direction (a direction orthogonal to the A direction) of a portion 6c (a portion where the slit 6a of the pixel electrode 6 is not formed) 6c located near the boundary line of the pixel electrode 6 is seen in plan view. ) And the center in the B direction of the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 coincide with each other.

Although not shown, the alignment films are provided on the front side and the back side of the liquid crystal layer 1, respectively.

3 and 4 are schematic views for explaining the display operation of the liquid crystal display device according to the first embodiment of the present technology . Next, the display operation of the liquid crystal display device according to the first embodiment will be described with reference to FIGS.

First, when a driving voltage is applied to the liquid crystal driving electrodes (the common electrode 4 and the pixel electrode 6) from the state of FIG. 3, an electric field E is generated between the common electrode 4 and the pixel electrode 6 as shown in FIG. To do.
Thereby, the liquid crystal molecules 1 a of the liquid crystal layer 1 are driven by the electric field E generated between the common electrode 4 and the pixel electrode 6.

At this time, an electric field E that drives the liquid crystal molecules 1 a of the liquid crystal layer 1 is generated between the common electrode 4 and the pixel electrode 6 so as to straddle the edge 6 b of the slit 6 a of the pixel electrode 6. Therefore, the region corresponding to the central portion of the portion 6c where the slit 6a of the pixel electrode 6 is not formed (the region surrounded by the broken line in FIG. 4) or the region corresponding to the central portion of the slit 6a of the pixel electrode 6 Liquid crystal molecule 1a
Is substantially not generated. That is, in the region corresponding to the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 (the region surrounded by the broken line in FIG. 4), the liquid crystal molecules 1a are not substantially driven.

In the first embodiment, as described above, when viewed in a plan view, at least in the region inside the end region of the pixel electrode 6, the edge 6b of the slit 6a of the pixel electrode 6 and the adjustment layer 9 are formed. The electric field E that drives the liquid crystal molecules 1a of the liquid crystal layer 1 straddles the edge 6b of the slit 6a of the pixel electrode 6 so that the stepped portion 10 on the transparent substrate 3 side does not overlap with each other. 4 and the pixel electrode 6, an electric field E that drives the liquid crystal molecules 1 a to a region corresponding to the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9.
Can be suppressed. As a result, even if the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 causes the alignment of the liquid crystal molecules 1 a to be disturbed, the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 Since the liquid crystal molecules 1a located in the corresponding region are not substantially driven, it is possible to suppress the inconvenience that the alignment of the liquid crystal molecules 1a is disturbed. As a result, it is possible to prevent the display quality of the liquid crystal display device from deteriorating.

In the first embodiment, as described above, when viewed in a plan view, a portion (pixel electrode 6) located near the boundary line of the pixel electrode 6 in a region inside the end region of the pixel electrode 6. The step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 is accommodated in the portion 6c where the slit 6a is not formed). In the region inside the end region, the edge 6b of the slit 6a of the pixel electrode 6 and the stepped portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 are easily suppressed from overlapping each other. it can.

FIG. 5 shows a pixel electrode (second electrode) provided in a liquid crystal display device according to a modification of the first embodiment.
FIG. Referring to FIG. 5, the liquid crystal display device according to the modification of the first embodiment is the same as the first embodiment except that the inclination direction of the slit 6a of the pixel electrode 6 is different from that of the first embodiment. It is configured.

Thus, even if the inclination direction of the slit 6a of the pixel electrode 6 is different from that of the first embodiment, the same effect as that of the first embodiment can be obtained.

(Second Embodiment)
FIG. 6 is a plan view of a pixel electrode (second electrode) provided in the liquid crystal display device according to the second embodiment of the present technology . Next, the structure of the liquid crystal display device according to the second embodiment will be described with reference to FIG.

In the liquid crystal display device according to the second embodiment, a pixel electrode (second electrode) 26 as shown in FIG. 6 is used. The structure of the portion other than the pixel electrode 26 of the liquid crystal display device according to the second embodiment is the same as the structure of the liquid crystal display device of the first embodiment shown in FIG.

The pixel electrode 26 according to the second embodiment has a slit 26 a for controlling the alignment of the liquid crystal molecules in the liquid crystal layer 1. The slits 26a of the pixel electrode 26 are formed in an elongated shape when seen in a plan view, and a plurality of slits 26a are arranged in each of a region corresponding to the reflective display region 11a and a region corresponding to the transmissive display region 11b. . Further, the plurality of slits 26a of the pixel electrode 26 disposed in each of the region corresponding to the reflective display region 11a and the region corresponding to the transmissive display region 11b are classified into two slit groups each including a predetermined number of slits 26a. Has been. In addition, in each of the region corresponding to the reflective display region 11a and the region corresponding to the transmissive display region 11b, the inclination direction when the slit 26a of the pixel electrode 26 is viewed in a plane is different between the slit groups. That is, each of the reflective display area 11a and the transmissive display area 11b has a multi-domain structure.

Further, in the second embodiment, as in the first embodiment, when viewed in a plan view, at least a region inside the end region of the pixel electrode 26 (a region surrounded by a broken line in FIG. 6). The edge 26b of the slit 26a of the pixel electrode 26 and the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 are configured not to overlap each other. That is, in the second embodiment, the boundary line of the pixel electrode 26 in at least a region inside the end region of the pixel electrode 26 (region surrounded by a broken line in FIG. 6) when viewed in plan. The part located in the vicinity (
The stepped portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 is housed in a portion 26 c where the slit 26 a of the pixel electrode 26 is not formed.

In the second embodiment, as described above, when viewed in a plan view, at least in the region inside the end region of the pixel electrode 26, the edge 26b of the slit 26a of the pixel electrode 26 and the adjustment layer 9 are formed. By configuring so that the stepped portion 10 on the transparent substrate 3 side does not overlap each other, it is possible to suppress the occurrence of the disadvantage that the alignment of the liquid crystal molecules of the liquid crystal layer 1 is disturbed, as in the first embodiment. Since it can do, it can suppress that the display quality of a liquid crystal display device falls.

In the second embodiment, as described above, the reflective display area 11a and the transmissive display area 11 are also used.
By making each of b have a multi-domain structure, the viewing angle can be improved as compared with the first embodiment.

FIG. 7 shows a pixel electrode (second electrode) provided in a liquid crystal display device according to a modification of the second embodiment.
FIG. Referring to FIG. 7, the liquid crystal display device according to the modification of the second embodiment is the same as the second embodiment except that the inclination direction of the slit 26a of the pixel electrode 26 is different from that of the second embodiment. It is configured.

Thus, even if the inclination direction of the slit 26a of the pixel electrode 26 is different from that of the second embodiment, the same effect as that of the second embodiment can be obtained.

(Third embodiment)
FIG. 8 is a plan view of a pixel electrode (second electrode) provided in the liquid crystal display device according to the third embodiment of the present technology . Next, the structure of the liquid crystal display device according to the third embodiment will be described with reference to FIG.

In the liquid crystal display device according to the third embodiment, a pixel electrode (second electrode) 36 as shown in FIG. 8 is used. The structure of the portion other than the pixel electrode 36 of the liquid crystal display device according to the third embodiment is the same as the structure of the liquid crystal display device of the first embodiment shown in FIG.

The pixel electrode 36 of the third embodiment has a plurality of slits 36 a for controlling the alignment of liquid crystal molecules in the liquid crystal layer 1. In the third embodiment, each of the plurality of slits 36a of the pixel electrode 36 is formed in an elongated shape extending along the A direction (the short side direction of the pixel) and also in the B direction (perpendicular to the A direction). Are arranged at a predetermined interval from each other.

Here, in the third embodiment, when viewed in a plan view, at least in the region inside the end region of the pixel electrode 36 (the region surrounded by the broken line in FIG. 8), the slit of the pixel electrode 36 is formed. The edge 36b of 36a and the level | step-difference part 10 by the side of the transparent substrate 3 formed of the adjustment layer 9 are comprised so that it may not mutually overlap.

Specifically, in the third embodiment, the slits 36 a are also arranged in a portion located near the boundary line of the pixel electrode 36 when viewed in plan. Then, when viewed in a plan view, at least a slit 36a located near the boundary line of the pixel electrode 36 in a region inside the end region of the pixel electrode 36 (region surrounded by a broken line in FIG. 8). The step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 is accommodated in the opening. Furthermore, in the third embodiment, when viewed in plan, the center in the B direction of the slit 36 a located near the boundary line of the pixel electrode 36 and B of the step portion 10 on the transparent substrate 3 side formed by the adjustment layer 9. The direction centers coincide with each other.

In the third embodiment, as described above, when viewed in a plan view, at least in the region inside the end region of the pixel electrode 36, the edge 36b of the slit 36a of the pixel electrode 36 and the adjustment layer 9 are formed. By configuring so that the stepped portion 10 on the transparent substrate 3 side does not overlap each other, it is possible to suppress the occurrence of the disadvantage that the alignment of the liquid crystal molecules of the liquid crystal layer 1 is disturbed, as in the first embodiment. Since it can do, it can suppress that the display quality of a liquid crystal display device falls.

In the third embodiment, as described above, when viewed in a plan view, within the opening of the slit 36 a located near the boundary line of the pixel electrode 36 in the region inside the end region of the pixel electrode 36. In addition, the configuration is such that the stepped portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 is accommodated, so that when viewed in a plan view, in the region inside the end region of the pixel electrode 36, the pixel electrode The edge 36b of the 36 slit 36a and the stepped portion 10 on the transparent substrate 3 side formed by the adjustment layer 9 can be easily prevented from overlapping each other.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

It is sectional drawing which showed the structure of the liquid crystal display device by 1st Embodiment of this technique . FIG. 2 is a plan view of a pixel electrode (second electrode) provided in the liquid crystal display device according to the first embodiment shown in FIG. 1. It is a schematic diagram for demonstrating the display operation of the liquid crystal display device by 1st Embodiment of this technique . It is a schematic diagram for demonstrating the display operation of the liquid crystal display device by 1st Embodiment of this technique . It is a top view of the pixel electrode (2nd electrode) provided in the liquid crystal display device by the modification of 1st Embodiment. It is a top view of the pixel electrode (2nd electrode) provided in the liquid crystal display device by 2nd Embodiment of this technique . It is a top view of the pixel electrode (2nd electrode) provided in the liquid crystal display device by the modification of 2nd Embodiment. It is a top view of the pixel electrode (2nd electrode) provided in the liquid crystal display device by 3rd Embodiment of this technique . It is sectional drawing which showed simply an example of the structure of the transflective liquid crystal display device which employ | adopted the conventional horizontal electric field system.

Explanation of symbols

1 Liquid crystal layer 1a Liquid crystal molecule 2 Transparent substrate (first substrate)
3 Transparent substrate (second substrate)
4 Common electrode (first electrode)
6, 26, 36 Pixel electrode (second electrode)
6a, 26a, 36a Slit 6b, 26b, 36b Edge 9 Adjustment layer 10 Stepped portion 11a Reflection display area 11b Transmission display area

Claims (3)

A transflective liquid crystal display device in which a display operation is performed in a horizontal electric field mode and a reflective display region and a transmissive display region are provided in one pixel,
A first substrate and a second substrate arranged to face each other with a liquid crystal layer interposed therebetween;
A first electrode formed on the liquid crystal layer side surface of the first substrate;
A slit is formed on the surface of the first electrode on the liquid crystal layer side for controlling the alignment of liquid crystal molecules in the liquid crystal layer, and an electric field is generated between the first electrode and the first electrode. A second electrode for driving liquid crystal molecules of the liquid crystal layer;
The second substrate is formed in a region corresponding to the reflective display region on the liquid crystal layer side surface of the second substrate, and the thickness of the liquid crystal layer in the reflective display region is smaller than the thickness of the liquid crystal layer in the transmissive display region. And a convex adjustment layer for adjusting so that
A plurality of slits are arranged in each of a region corresponding to the reflective display region and a region corresponding to the transmissive display region,
The area corresponding to the reflective display area has a first slit group and a second slit group each including a predetermined number of slits,
The area corresponding to the transmissive display area has a third slit group and a fourth slit group each including a predetermined number of slits,
The first slit group and the third slit group, and the second slit group and the fourth slit group are adjacent to each other across a step portion on the second substrate side formed by the adjustment layer. ,
When viewed in a plan view, before SL region inside the end region of the second electrode, prior to the edge of the kiss-lit, with the previous and the Kidan difference portion is configured to non-overlapping,
The inclination of the slits is different between the first slit group and the second slit group, and between the third slit group and the fourth slit group, and the first slit A liquid crystal display device in which the inclination of the slits is different between a group and the third slit group, and between the second slit group and the fourth slit group .   The step portion is located in a portion where the slit is not formed,
  2. The liquid crystal display device according to claim 1, wherein a center of the stepped portion in a predetermined direction is coincident with a center of the predetermined direction of a portion where the slit is not formed.   The inclination of the slit is in the same direction between the first slit group and the fourth slit group and between the second slit group and the third slit group. Item 3. A liquid crystal display device according to Item 2.

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