JP2006292940A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device from which roughening of display is eliminated and further in which characteristics of a transmissive portion is not deteriorated by fixing the position of alignment defect to a reflective portion. <P>SOLUTION: The liquid crystal display device has the transmissive portion to conduct a transmissive display and the reflective portion to conduct a reflective display within a dot region. On a first substrate 10, a pixel electrode composed of a reflective electrode 21 and a transparent electrode 22 is formed for each dot region. A second substrate 30 is placed opposite to the first substrate 10 and has a common electrode 34 formed thereon. A liquid crystal 4 is filled in between the first substrate 10 and the second substrate 30. In the reflective portion, a liquid crystal layer thickness adjusting layer 33 to adjust layer thickness of the liquid crystal 4 of the reflective portion and the transmissive portion is formed between the second substrate 30 and the common electrode 34. A protrusion structure 35 as an alignment controlling means to axisymmetrically align liquid crystal molecules on voltage application by making itself be the axis is arranged on the reflective portion of the second substrate 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that performs both reflective display and transmissive display.

  In recent years, portable information terminals such as mobile phones and PDAs have become widespread, and the demand for liquid crystal display devices having the advantages of being thin and lightweight has been increasing. As a liquid crystal display device, a combination type (semi-transmissive type) liquid crystal display that uses external light in a bright place as in the case of a reflective liquid crystal display device, and in a dark place, the display can be visually recognized by a backlight as in a transmissive display device. An apparatus has been proposed (see, for example, Patent Document 1).

  By the way, the liquid crystal alignment mode includes a twisted nematic mode (hereinafter referred to as a TN mode) in which liquid crystal molecules are twisted in parallel with the substrate surface when no voltage is applied, and liquid crystal molecules are aligned vertically. Vertical alignment mode. Conventionally, the TN mode has been the mainstream from the viewpoint of reliability and the like, but recently, the vertical alignment mode has some excellent characteristics, and thus the liquid crystal display device of the vertical alignment mode has attracted attention.

  For example, in the vertical alignment mode, the state in which liquid crystal molecules are aligned perpendicular to the substrate surface (no optical retardation as viewed from the normal direction) is used as black display, so the quality of black display is good and high contrast is achieved. Is obtained. In the vertical alignment mode, white display is obtained by tilting the liquid crystal molecules from the vertical direction (closer to the direction parallel to the substrate surface).

  A liquid crystal display device in a vertical alignment mode is disclosed in Patent Document 2. In Patent Document 2, three types of structures shown in FIGS. 14 to 16 are disclosed.

  In the liquid crystal display device illustrated in FIG. 14A, a reflective film 111, a reflective color resist 112, a transmissive color resist 113, an insulating film 114, a transparent pixel electrode 115, and a vertical film are formed on a first substrate 110. An alignment film 116 is formed. The region where the reflective color resist 112 is formed becomes a reflective portion for performing reflective display, and the region where the transparent color resist 113 is formed becomes a transmissive portion for performing transmissive display. A transparent common electrode 131 and a vertical alignment film 132 are formed on the second substrate 130. A liquid crystal 140 is filled between the first substrate 110 and the second substrate 130.

  The insulating film 114 is formed at the center of the dot region, and is provided to adjust the layer thickness of the liquid crystal 140 in the reflective portion and the transmissive portion. The central portion of the insulating film 114 is a reflection portion, and the periphery thereof is a transmission portion. As shown in FIG. 14B, when a voltage is applied, the liquid crystal molecules 140 a are tilted outward along the inclined surface (side surface) of the insulating film 114. Further, since the pixel electrode 115 is divided for each dot region, an oblique electric field is generated at the end of the pixel electrode 115, and the liquid crystal molecules 140a fall inward.

  As a result, the liquid crystal molecules 140a between the end portions of the insulating film 114 and the pixel electrode 115 remain in the vertical state, and the alignment defect portion C is generated. The alignment defect portion C is linearly generated in the transmission portion so as to surround the reflection portion. In the alignment defect part C, it will be in a black state and will reduce the transmittance | permeability in a transmission part. Further, since the structure that defines the position of the alignment defect portion C does not exist on the second substrate 130 side, the position of the defect is different for each dot region, which causes display roughness.

  In the liquid crystal display device shown in FIG. 15, an opening (window) 131 a is formed in the common electrode 131. In this case, when a voltage is applied, liquid crystal molecules 140a that remain in a vertical state are generated on the opening 131a. Since the alignment defect portion C due to the liquid crystal 140a always occurs in the opening 131a, display roughness does not occur, but in the alignment defect portion C, the transmittance in the transmission portion decreases.

  In the liquid crystal display device illustrated in FIG. 16, the semiconductor layer 211, the gate insulating film 212, the gate electrode 213, the signal line 214, the drain electrode 215, the interlayer insulating film 216, and the reflective film are formed on the first substrate 210. 217, a pixel electrode 218, and a vertical alignment film 219 are formed. Further, a transmissive color resist 231, a reflective color resist 232, an insulating film 233, a common electrode 234, and a vertical alignment film 235 are formed on the second substrate 230. A liquid crystal 240 is filled between the first substrate 210 and the second substrate 230. The formation area of the transmission color resist 231 becomes a transmission part, and the formation area of the reflection color resist 232 becomes a reflection part.

In the structure shown in FIG. 16, the central part of the dot area is a transmissive part, and there is a reflective part so as to surround the transmissive part. An insulating film 233 for adjusting the layer thickness of the liquid crystal is formed at a position corresponding to the reflective portion under the common electrode 234. At the time of voltage application, the common electrode 234 is divided into a reflective portion and a transmissive portion, so that the liquid crystal molecules 240a fall down as shown in FIG. As a result, liquid crystal molecules 240a that remain in the vertical state are generated in the central portion and the reflective portion of the transmissive portion. The dot-like alignment defect portion C generated in the transmission portion decreases the transmittance of the transmission portion, and the linear alignment defect portion C ′ generated in the reflection portion decreases the reflectance of the reflection portion.
JP 2002-333624 A JP 2003-295177 A JP 2004-279565 A

  As described above, in each of the structures shown in FIGS. 14 and 15, the linear alignment defect portion C is generated in the transmission portion. In recent combined type liquid crystal display devices, since the characteristics in the transmissive part are being emphasized, it is not preferable that the linear alignment defect part C occurs in the transmissive part.

  In the structure shown in FIG. 16, only the dot-like alignment defect portion C is generated in the transmission portion, but the linear alignment defect portion C ′ is generated in the reflection portion. Even if it is a reflection part, if the alignment defect part C 'becomes linear, the decrease in reflectance becomes remarkable, which is not preferable. Considering the recent trend in which the characteristics in the transmissive part are emphasized, it is not preferable that an alignment defect part exists even if the transmissive part has a dot shape.

  However, in the vertical alignment mode, it is difficult to eliminate the alignment defect portion when a voltage is applied. For this reason, in a vertical alignment mode liquid crystal display device, it is desired to minimize the number of alignment defect portions and always fix the position of the defect to the reflection portion. By the way, it is known that the alignment of liquid crystal molecules can be regulated by a protruding structure or an opening (see Patent Document 3).

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal display that eliminates display roughness and does not deteriorate the characteristics of the transmission part by fixing the position of the alignment defect to the reflection part. To provide an apparatus.

  In order to achieve the above object, the liquid crystal display device of the present invention is a liquid crystal display device having a transmissive portion that performs transmissive display and a reflective portion that performs reflective display in one dot region, and a pixel for each dot region. A first substrate on which an electrode is formed, a second substrate disposed opposite to the first substrate and having a common electrode formed thereon, and formed between the first substrate and the second substrate. The liquid crystal layer whose initial alignment state is vertical alignment is formed between the second substrate and the common electrode in the reflection portion, and adjusts the layer thickness of the liquid crystal layer in the reflection portion and the transmission portion. A liquid crystal layer thickness adjusting layer; and an alignment regulating means which is formed on the common electrode in the reflecting portion and which is axially symmetric with respect to itself when a voltage is applied.

  In the above-described liquid crystal display device of the present invention, the alignment regulating means for axisymmetrically aligning the liquid crystal molecules with respect to itself as an axis is formed in the reflecting portion. When a voltage is applied between the pixel electrode and the common electrode, the surrounding liquid crystal molecules fall symmetrically (orientate) with the orientation regulating means as an axis. At the position of the alignment regulating means, the liquid crystal molecules do not fall down and become alignment defects. However, since this is a dot shape, a decrease in the reflectance at the reflecting portion can be minimized. Further, since there is no alignment defect in the transmission part, there is no decrease in the transmittance.

  According to the present invention, it is possible to realize a liquid crystal display device that eliminates display roughness and does not deteriorate the characteristics of the transmission part by fixing the position of the alignment defect to the reflection part.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a plan view of the liquid crystal display device according to the first embodiment.

  FIG. 1 shows a plan view of three dot regions 1. In the present embodiment, a red color filter, a green color filter, and a blue color filter are arranged in each dot area 1, and one pixel (pixel) is configured by three dot areas (subpixels) 1. However, if it is not a color liquid crystal display device, one dot region 1 constitutes one pixel.

  A gate line 11 and a signal line 17 which are orthogonal to each other are formed, and a region surrounded by the gate line 11 and the signal line 17 is a dot region 1. In each dot region 1, a reflective electrode 21 is formed at the center, and a transparent electrode 22 is formed so as to surround the reflective electrode 21. A region where the reflective electrode 21 is formed becomes a reflective portion, and a region where the transparent electrode 22 is formed becomes a transmissive portion. A liquid crystal layer thickness adjusting layer 33 that adjusts the layer thickness of the liquid crystal in the reflecting portion is disposed in the reflecting portion, and the central portion of the reflecting portion (which is also the center portion of the dot region 1) serves as an alignment regulating means. The protruding structure 35 is disposed.

  2 is a cross-sectional view taken along the line A-A ′ of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B ′ of FIG. 1.

  A signal line 17 is formed on the first substrate 10 made of a quartz substrate or a glass substrate, and an organic insulating film 20 made of a photosensitive resin is formed on the signal line 17. Surface irregularities are formed on the organic insulating film 20 in the reflective portion by lithography.

  A reflective electrode 21 is formed on the organic insulating film 20 in the reflective portion. The reflective electrode 21 has surface irregularities reflecting the surface irregularities of the underlying organic insulating film 20. Thereby, a reflecting plate having scattering properties is formed. The reflective electrode 21 is made of, for example, silver or aluminum.

  A transparent electrode 22 is formed on the organic insulating film 20 in the transmission part. The transparent electrode 22 is made of, for example, ITO (Indium Tin Oxide). The transparent electrode 22 is electrically connected to the reflective electrode 21. Although not shown, a vertical alignment film is formed on the reflective electrode 21 and the transparent electrode 22.

  A second substrate 30 made of a quartz substrate or a glass substrate is disposed to face the first substrate 10. A color filter 31 is formed on the second substrate 30. The color filter 31 includes a red color filter 31R, a green color filter 31G, and a blue color filter 31B arranged for each dot region 1. The color filter 31 is made of a color resist patterned by a lithography process. A planarizing film 32 is formed on the color filter 31. The planarization film 32 can be omitted.

  On the planarizing film 32 of the second substrate 30, a liquid crystal layer thickness adjusting layer 33 for reducing the layer thickness of the liquid crystal 4 in the reflecting portion is formed in a portion corresponding to the reflecting portion. The liquid crystal layer thickness adjusting layer 33 is made of, for example, an insulating photosensitive resin, and is patterned by a lithography technique.

  A common electrode 34 is formed on the planarizing film 32 so as to cover the liquid crystal layer thickness adjusting layer 33. The common electrode 34 is made of a transparent electrode such as ITO.

  On the common electrode 34 at the portion where the liquid crystal layer thickness adjusting layer 33 is formed, a protruding structure 35 is formed as an alignment regulating means. The protruding structure 35 is made of an insulating photosensitive resin, and is arranged at the center of the reflecting portion. The protruding structure 35 is formed by patterning by a photolithography technique. By this protruding structure 35, the electric field between the pixel electrode (the reflective electrode 21 and the transparent electrode 22) and the common electrode 34 can be changed to regulate the alignment of the liquid crystal molecules 4a. That is, in a state where a voltage is applied, the liquid crystal molecules 4a are tilted symmetrically about the protruding structure 35 (axis-symmetric alignment). The protruding structure 35 becomes the center of axial symmetry alignment when the liquid crystal molecules 4a are axially symmetrically aligned.

  Although not shown, a vertical alignment film is formed on the common electrode 34 so as to cover the protruding structure 35. In addition, although not shown, columnar spacers are disposed between the first substrate 10 and the second substrate 30 that face each other so as to keep the substrate interval constant.

  A liquid crystal 4 is filled in a gap between the first substrate 10 and the second substrate 30 that are arranged to face each other. The liquid crystal 4 is made of a liquid crystal whose initial alignment state is vertical alignment, that is, a liquid crystal material having a negative dielectric anisotropy.

  Although not shown, broadband circularly polarizing plates are respectively disposed outside the first substrate 10 and the second substrate 30. The pair of broadband polarizing plates are arranged so that their transmission axes form an angle of 90 °.

  In FIG. 1, a TFT (Thin Film Transistor) as a switching element is formed under the reflective electrode 21 of the first substrate 10 and at the intersection of the signal line 17 and the gate line 11. FIG. 4 is a detailed enlarged sectional view on the first substrate 10 side for explaining the TFT.

  On the first substrate 10, a gate line (gate electrode) 11 and an auxiliary capacitance line 12 are formed. A gate insulating film 13 is formed on the first substrate 10 so as to cover the gate line 11 and the auxiliary capacitance line 12. The gate insulating film 13 is made of a silicon oxide film or a laminated film of a silicon oxide film and a silicon nitride film.

  On the gate insulating film 13, a semiconductor layer 14 made of, for example, polysilicon is formed. A stopper film 15 is formed on the semiconductor layer 14 above the gate line 11, and an interlayer insulating film 16 is formed on the semiconductor layer 14 so as to cover the stopper film 15. The stopper film 15 is made of, for example, a silicon oxide film, and the interlayer insulating film 16 is made of, for example, a laminated film of a silicon oxide film and a silicon nitride film.

  On the interlayer insulating film 16, a signal line (which becomes a source electrode of the TFT) 17, a drain electrode 18, and an auxiliary capacitance electrode 19 are formed. The signal line 17 and the drain electrode 18 are connected to the semiconductor layer 14. The auxiliary capacitance electrode 19 forms an auxiliary capacitance with the auxiliary capacitance line 12. The signal line 17, the drain electrode 18, and the auxiliary capacitance electrode 19 are made of aluminum, for example.

  The gate line 11, the semiconductor layer 14, the signal line 17 and the drain electrode 18 constitute a TFT as a switching element. An organic insulating film 20 is formed so as to cover the signal line 17, the drain electrode 18 and the auxiliary capacitance electrode 19, and a reflective electrode 21 is formed on the organic insulating film 20 in the TFT formation region. The reflective electrode 21 is electrically connected to the drain electrode 18 of the TFT.

  In the liquid crystal display device according to the present embodiment, when no voltage is applied, as shown in FIG. 2, the liquid crystal molecules 4a are vertically aligned and are in a dark state.

  FIG. 5 is a plan view of the liquid crystal display device in a state where a voltage is applied, and FIG. 6 is a cross-sectional view taken along the line A-A ′ of FIG. 5.

  When a voltage is applied, as shown in FIGS. 5 and 6, the surrounding liquid crystal molecules 4 a fall down with the protruding structure 35 formed on the second substrate 30 side as the center of axial symmetry alignment. At this time, the liquid crystal molecules 4a around the protruding structure 35 are aligned symmetrically with the protruding structure 35 as the center. This state is a bright state.

  At the projecting structure 35, that is, at the center of axial symmetry alignment, the liquid crystal molecules 4a are not tilted and remain in the vertical state (see FIG. 6). In addition, as a result of the liquid crystal molecules 4a tilting with the protruding structure 35 as the axis of symmetry in each dot region 1, the liquid crystal molecules 4a in the region between the dot regions 1 also remain in a vertical state.

  For this reason, although it becomes an alignment defect and becomes a dark state in an axially symmetrical alignment center, since it is a dot shape, the fall of the reflectance in a reflection part can be suppressed as much as possible. Further, since there is no alignment defect in the transmission part, there is no decrease in the transmittance. Furthermore, since the area between the dot areas 1 is originally shielded by the signal line 17 and does not contribute to the display, there is no problem even if an alignment defect exists in this area.

  Further, when the axially symmetric center is determined by the protruding structure 35, it is confirmed that when a voltage is applied, the dot region 1 falls in a chain manner from the outer liquid crystal molecule 4a to the inner liquid crystal molecule 4a. . Since the vicinity of the axially symmetric alignment center where the liquid crystal molecules 4a fall more slowly exists in the reflection part, the response speed of the transmission part becomes faster. Therefore, the liquid crystal display device according to the present embodiment is most suitable for a transflective liquid crystal display device that emphasizes transmission characteristics.

(Second Embodiment)
FIG. 7 is a plan view of the liquid crystal display device according to the second embodiment. FIG. 8 is a cross-sectional view taken along the line AA ′ of FIG. 9 is a cross-sectional view taken along line BB ′ of FIG. In addition, the same code | symbol is attached | subjected to the component similar to 1st Embodiment, and the description is abbreviate | omitted.

  In the present embodiment, an opening (hole) 36 is arranged as an orientation regulating means at the center of the reflecting portion (also the center of the dot region 1). The opening 36 is formed by removing the common electrode 34 at a portion to be the opening by a photolithography technique.

  When a voltage is applied, as in the first embodiment in which the protruding structure is formed, the surrounding liquid crystal molecules 4a fall symmetrically with the opening 36 as the center of axial symmetry alignment. This is because an oblique electric field is generated between the reflective electrode 21 and the common electrode 34 around the opening 36, and the direction in which the liquid crystal molecules 4a are tilted along the oblique electric field can be regulated. .

  Also with the liquid crystal display device according to the present embodiment, since the position of the opening 36 can always be the center of axial symmetry, the same effect as the first embodiment can be obtained.

(Third embodiment)
FIG. 10 is a plan view of the liquid crystal display device according to the present embodiment. 11 is a cross-sectional view taken along the line AA ′ in FIG. 10, and FIG. 12 is a cross-sectional view taken along the line BB ′ in FIG.

  The dot area 1 may be a rectangle instead of a square. In the case of the rectangular dot region 1, it is difficult to achieve an axially symmetric orientation with good control even if an orientation regulating means comprising the protruding structure 35 or the opening 36 is arranged at the center thereof.

  For this reason, when the rectangular dot region 1 is divided into two in the longitudinal direction, each dot region 1 is divided into a first region 2 and a second region 3 when a shape closer to a square is obtained. In the present embodiment, the first region 2 is provided with a reflective portion and a transmissive portion, and the second region 3 is provided with only a transmissive portion with an emphasis on transmission characteristics. And the protrusion structure 35 is provided in the center of each of the 1st area | region 2 and the 2nd area | region 3 as an orientation control means. An opening may be formed instead of the protruding structure 35.

  The configuration of the first region 2 in the dot region 1 is the same as in the first embodiment. That is, in the first region 2, the reflective electrode 21 is formed at the center, and the transparent electrode 22 is formed so as to surround the reflective electrode 21. A region where the reflective electrode 21 is formed becomes a reflective portion, and a region where the transparent electrode 22 is formed becomes a transmissive portion. A liquid crystal layer thickness adjusting layer 33 that adjusts the layer thickness of the liquid crystal in the reflecting portion is disposed in the reflecting portion, and the central portion of the reflecting portion (which is also the center portion of the dot region 1) has a protrusion as an alignment regulating means. A structure 35 is arranged.

  In the second region 3, only the transparent electrode 22 is formed. For this reason, the whole 2nd area | region 3 becomes a permeation | transmission part. At the center of the second region 3, a protruding structure 35 is formed as an orientation regulating means. The protruding structure 35 is formed on the common electrode 34.

  In the first region 2 and the second region 3, the transparent electrode 22 is integrally formed. Further, the transparent electrode 22 has a constricted portion 22 a having a narrow width at the boundary between the first region 2 and the second region 3. In this way, the constricted portion 22a is provided at the boundary between the first region 2 and the second region 3, and the pixel electrodes in the first region 2 and the second region 3 (the reflective electrode 21 and the transparent electrode 22 in the first region 2, the first In the second region 3, the shape of the transparent electrode 22) is close to a square.

  Also in the liquid crystal display device according to the present embodiment, when a voltage is applied, as shown in FIG. 13, in the first region 2 and the second region 3 in the dot region 1, the protruding structure 35 is set as an axially symmetric alignment center. The surrounding liquid crystal molecules 4a fall down.

  In the first region 2, there is one axially symmetric alignment center serving as an alignment defect in the reflection portion, and since this is a dot shape, it is possible to minimize a decrease in the reflectance of the reflection portion. Further, since there is no alignment defect in the transmission part, there is no decrease in the transmittance.

  In the second region 3, there is one axially symmetric alignment center that becomes an alignment defect. However, since this is a point-like shape, it is possible to minimize a decrease in the transmittance of the transmission part. Further, by providing the second region 3 that performs only transmissive display in the dot region 1, the transmission characteristics can be further improved.

The present invention is not limited to the description of the above embodiment. For example, in the third embodiment, the second region 3 may be a reflective portion that performs only reflective display. Further, the second region 3 may be configured to include both a reflection portion and a transmission portion, similarly to the first region 2.
In addition, various modifications can be made without departing from the scope of the present invention.

1 is a plan view of a liquid crystal display device according to a first embodiment. It is sectional drawing along the A-A 'line of FIG. It is sectional drawing along the B-B 'line of FIG. It is detailed sectional drawing of a 1st board | substrate. It is a top view of the liquid crystal display device which concerns on 1st Embodiment, and is a figure which shows a mode that the orientation of a liquid crystal is axisymmetric orientation in the state which applied the voltage. FIG. 6 is a cross-sectional view taken along line A-A ′ of FIG. 5. It is a top view of the liquid crystal display device which concerns on 2nd Embodiment. FIG. 8 is a cross-sectional view taken along line A-A ′ of FIG. 7. FIG. 8 is a cross-sectional view taken along line B-B ′ of FIG. 7. It is a top view of the liquid crystal display device which concerns on 3rd Embodiment. It is sectional drawing along the A-A 'line of FIG. It is sectional drawing along the B-B 'line of FIG. It is a top view of the liquid crystal display device which concerns on 3rd Embodiment, and is a figure which shows a mode that the orientation of a liquid crystal is axisymmetric orientation in the state which applied the voltage. It is sectional drawing of the liquid crystal display device of a prior art example. It is sectional drawing of the liquid crystal display device of a prior art example. It is sectional drawing of the liquid crystal display device of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dot area | region, 2 ... 1st area | region, 3 ... 2nd area | region, 4 ... Liquid crystal, 4a ... Liquid crystal molecule, 10 ... 1st board | substrate, 11 ... Gate line, 12 ... Auxiliary capacitance line, 13 ... Gate insulating film, DESCRIPTION OF SYMBOLS 14 ... Semiconductor layer, 15 ... Stopper film, 16 ... Interlayer insulation film, 17 ... Signal line, 18 ... Drain electrode, 19 ... Auxiliary capacity electrode, 20 ... Organic insulation film, 21 ... Reflective electrode, 22 ... Transparent electrode, 22a ... Constriction, 31 ... color filter, 30 ..., 31R ... red color filter, 31G ... green color filter, 31B ... blue color filter, 32 ... flattening film, 33 ... liquid crystal layer thickness adjusting layer, 34 ... common electrode, 35 ... Projection structure, 36 ... opening, 110 ... first substrate, 111 ... reflection film, 112 ... reflection color resist, 113 ... transmission color resist, 114 ... insulating film, 115 ... pixel electrode, 116 ... vertical alignment film, 13 DESCRIPTION OF SYMBOLS ... 2nd board | substrate, 131 ... Common electrode, 131a ... Opening part, 132 ... Vertical alignment film, 140 ... Liquid crystal, 140a ... Liquid crystal molecule, 210 ... 1st board | substrate, 211 ... Semiconductor layer, 212 ... Gate insulating film, 213 ... Gate electrode, 214 ... Signal line, 215 ... Drain electrode, 216 ... Interlayer insulating film, 217 ... Reflective film, 218 ... Pixel electrode, 219 ... Vertical alignment film, 230 ... Second substrate, 231 ... Transparent color resist, 232 ... reflective color resist, 233 ... insulating film, 234 ... common electrode, 235 ... vertical alignment film, 240 ... liquid crystal, 240a ... liquid crystal molecule, C ... orientation defect part

Claims (5)

A liquid crystal display device having a transmissive portion for performing transmissive display and a reflective portion for performing reflective display in one dot region,
A first substrate on which a pixel electrode is formed for each dot region;
A second substrate disposed opposite to the first substrate and having a common electrode formed thereon;
A liquid crystal filled between the first substrate and the second substrate and having an initial alignment state of vertical alignment;
A liquid crystal layer thickness adjusting layer that is formed between the second substrate and the common electrode in the reflective portion and adjusts the liquid crystal layer thickness of the reflective portion and the transmissive portion;
A liquid crystal display device provided on the reflecting portion of the second substrate and having an alignment regulating means for axisymmetrically aligning liquid crystal molecules with respect to itself when a voltage is applied. The liquid crystal display device according to claim 1, wherein the orientation restricting unit includes a protruding structure formed on the common electrode in the reflecting portion. The liquid crystal display device according to claim 1, wherein the orientation restricting unit includes an opening formed in the common electrode in the reflecting portion. The liquid crystal display device according to claim 1, wherein the transmissive portion is disposed so as to surround the reflective portion in one dot region. One of the dot regions is divided into a first region having a reflective portion and a transmissive portion, and a second region having at least a reflective portion or a transmissive portion,
The liquid crystal display device according to claim 1, wherein the orientation restricting unit is provided in each of the reflecting portion of the first region and the second region.

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