JP2009282059A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a semi-transmissive liquid crystal display device in which display quality is improved with high yield, while attaining a wide viewing angle. <P>SOLUTION: The semi-transmissive liquid crystal display device includes a liquid crystal layer 3 which is sealed between a first substrate 30 and a second substrate 40. In a transmissive area T of a pixel electrode 2 extending from a reflective area R, a transparent conductive film 10 composed of an alignment control pattern 11 for controlling alignment of the liquid crystal layer 3 is provided. The alignment control pattern 11 is a root thick line pattern 12 whose width becomes narrower from around a boundary of the reflective area R in the transmissive area T to a peripheral section of the transparent conductive film 10, and it is formed integrally with the transparent conductive film 10 provided in the reflective area R. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a transflective liquid crystal display device that performs display in both a reflection mode and a transmission mode.

  The display methods of the liquid crystal display panel are roughly classified into a transmission type, a reflection type, and a transflective type. The transmissive type is a display method in which a light source called a backlight is turned on and display is performed using light that has passed through a liquid crystal display panel. For this reason, the visibility in a dark place is high, but the visibility in a bright place is low. On the other hand, the reflection type is a display method for performing display by reflecting light incident on the liquid crystal display panel. For this reason, the visibility in a bright place is high, but the visibility in a dark place is low. The transflective type is a display method having both a transmissive type and a reflective type, and a display with high visibility can be always provided by switching the display mode according to the ambient brightness. Due to its excellent display characteristics, transflective liquid crystal display devices are widely applied to portable devices and mobile devices.

  The transflective liquid crystal display device has a structure in which a liquid crystal layer is sandwiched between a first substrate and a second substrate. On the inner surface of the first substrate, a reflective film is formed in which a light transmission opening is formed in a metal film such as aluminum.

  In the reflection mode, external light incident from the second substrate side (viewing side) passes through the liquid crystal layer and is further reflected by a reflection film disposed on the inner surface of the first substrate. Then, the reflected light again passes through the liquid crystal layer and is emitted from the second substrate side, thereby contributing to display. On the other hand, in the transmissive mode, light from the backlight incident from the first substrate side (anti-viewing side) passes through the transmissive film and further passes through the liquid crystal layer. And it is contributed to a display by being radiate | emitted outside from the 2nd board | substrate side. Therefore, the region where the reflective film is formed becomes the reflective region, and the region where the opening of the reflective film is formed becomes the transmissive region.

  The conventional transflective liquid crystal display device has a problem that the viewing angle is narrow in the transmissive mode. This is because the reflective film is provided on the inner surface of the liquid crystal cell so that no parallax occurs, and there is a restriction that the reflective display must be performed with only one polarizing plate provided on the viewer side. This is because the degree of freedom is small.

  Therefore, in Patent Document 1, a transflective liquid crystal display device using a vertically aligned liquid crystal has been proposed. Its features are (1) the adoption of a “VA (Vertical Alignment) mode” in which a liquid crystal having a negative dielectric anisotropy is aligned perpendicularly to the substrate, and this is defeated by applying a voltage; (3) The transmissive region is a regular octagon or circle, and the counter substrate is tilted isotropically in this region, where the reflective region has a different liquid crystal layer thickness (cell gap). A so-called “alignment division structure” in which a protrusion is provided at the center of the upper transmission region is employed.

  In Patent Documents 2 and 3, one pixel region is divided into three substantially rectangular sub-pixel electrodes connected by a narrow connecting portion, one of which is a reflection region R and the other two are transmitted. A configuration as region T is disclosed. And the structure which provides the alignment control protrusion and the alignment control opening in each subpixel electrode is disclosed.

  In Patent Document 2, in order to stabilize the alignment of the liquid crystal, a plurality of spaces (slits) are formed from the edge of the pixel electrode made of a transparent conductive film such as ITO, and a fine thorn-like pattern configuration is disclosed. ing. Patent Document 3 discloses a configuration in which slits are provided in regions (four corner regions located on the boundary region side between the reflective region and the transmissive region) in which the orientation of the outer periphery of the pixel electrode is most disturbed.

Patent Document 4 discloses an example in which electrode slits of various shapes are provided in an example of a transmissive liquid crystal display device, although it is not an example of a transflective liquid crystal display device.
JP 2002-350853 A Japanese Patent Laid-Open No. 2005-173037 FIG. 3-4, paragraph numbers 0020-0022 Japanese Patent Laid-Open No. 2006-243317, FIG. 8-9, paragraph numbers 0051-0068 JP 2003-161947 A

  In the pixel electrode having a fine pattern structure in which a slit is provided in the pixel electrode as in the above Patent Documents 2 to 4, the laminated film disposed in the lower layer expands and contracts due to moisture or heat, which is originally intended. In some cases, the fine pattern may be deformed to a shape different from that of the fine pattern. In such a situation, alignment failure of the liquid crystal occurs, and the display quality deteriorates. Further, depending on the degree of expansion and contraction, the fine pattern of the pixel electrode may be divided and disconnected. Further, the disconnected pixel may cause short-circuiting between adjacent pixels, thereby causing a point defect. In particular, in the case where the lower layer of the pixel electrode is formed of an organic film, a technique for solving the deformation and disconnection of a fine pattern has been desired.

  The present invention has been made in view of the above-described background, and an object of the present invention is to improve display quality and increase yield while achieving a wide viewing angle in a transflective liquid crystal display device. An object of the present invention is to provide a liquid crystal display device.

  The liquid crystal display device according to the first aspect of the present invention includes a transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path, and predetermined light that is incident from the display surface side. A reflective region that is reflected so as to pass through the bidirectional optical path, a first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed, and a second substrate disposed opposite to the first substrate. A substrate, and a liquid crystal layer sealed between the first substrate and the second substrate. The transparent region of the pixel electrode extends from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is formed in the region. It is arranged. Furthermore, the orientation control pattern is a root thick line pattern that decreases in width from the vicinity of the boundary of the reflective region in the transmissive region toward the peripheral edge of the transparent conductive film, and the alignment control pattern is disposed in the reflective region. It is formed integrally with the transparent conductive film.

  The liquid crystal display device according to the second aspect of the present invention includes a transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path, and predetermined light that enters from the display surface side. A reflective region that is reflected so as to pass through the bidirectional optical path, a first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed, and a second substrate disposed opposite to the first substrate. A substrate, and a liquid crystal layer sealed between the first substrate and the second substrate. The transmissive region of the pixel electrode is a region extending from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is disposed in the region. It is installed. Further, the orientation control pattern is a line pattern composed of the transparent conductive film formed by providing a slit-like opening in the transparent conductive film of the transmissive region, and is disposed in the reflective region. The transparent conductive film and the alignment control pattern are integrally formed, and in the vicinity of the outer peripheral edge of the transparent conductive film in the transmissive region, at least the adjacent line patterns are electrically connected to each other. Is formed.

  A liquid crystal display device according to a third aspect of the present invention includes a transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path, and predetermined light that is incident from the display surface side. A reflective region that is reflected so as to pass through the bidirectional optical path, a first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed, and a second substrate disposed opposite to the first substrate. A substrate, and a liquid crystal layer sealed between the first substrate and the second substrate. The transmissive region of the pixel electrode is a region extending from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is disposed in the region. It is installed. Further, the alignment control pattern is a line pattern formed integrally with the transparent conductive film in the reflective region, and a pixel electrode in the reflective region is formed on a root portion of the line pattern and a layer immediately above the periphery. A conductive film to be electrically connected is covered.

  A liquid crystal display device according to a fourth aspect of the present invention includes a transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path, and predetermined light that is incident from the display surface side. A reflective region that is reflected so as to pass through the bidirectional optical path, a first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed, and a second substrate disposed opposite to the first substrate. A substrate, and a liquid crystal layer sealed between the first substrate and the second substrate. The transmissive region of the pixel electrode is a region extending from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is disposed in the region. It is installed. Furthermore, the orientation control pattern is a line pattern separated from the transparent conductive film in the reflection region, and the pixel in the reflection region is provided at an end of the line pattern on the reflection region side and immediately above the periphery thereof. A conductive film electrically connected to the electrode is covered.

  According to the present invention, the transflective liquid crystal display device has an excellent effect that it can provide a liquid crystal display device that realizes an improvement in display quality and a high yield while realizing a wide viewing angle. .

  Hereinafter, an example of an embodiment to which the present invention is applied will be described. It goes without saying that other embodiments may also belong to the category of the present invention as long as they match the gist of the present invention. Moreover, the size and ratio of each member in the following drawings are for convenience of explanation, and are not limited to this.

[Embodiment 1]
The transflective liquid crystal display device according to the first embodiment (hereinafter referred to as “liquid crystal display device”) includes a first substrate on which pixel electrodes are formed, and a second substrate disposed to face the first substrate. Have A liquid crystal layer is sandwiched between the pair of substrates. The first substrate is, for example, a wiring substrate such as a thin film transistor (TFT) array substrate (hereinafter referred to as “TFT array substrate”). A plurality of scanning signal lines are arranged in parallel on the first substrate. In the direction orthogonal to the scanning signal lines, a plurality of display signal lines are arranged in parallel and intersect with the scanning signal lines.

  A region surrounded by adjacent scanning signal lines and display signal lines is a pixel. That is, on the first substrate, the pixels are arranged in a matrix.

  The liquid crystal according to the first embodiment uses a liquid crystal material having negative dielectric anisotropy. In the state where no voltage is applied, the alignment is perpendicular to the first substrate and the second substrate. And by voltage application, it inclines from vertical alignment and switches to multiaxial alignment.

  FIG. 1 shows a schematic plan view of pixel electrodes for one pixel of a TFT array substrate (first substrate) of the liquid crystal display device according to the first embodiment. 2 is a schematic cross-sectional view of the TFT array substrate corresponding to the position of the cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a partially enlarged plan view of the pixel electrode in the region indicated by the dotted line A in FIG. Indicates. FIG. 4 is a schematic cross-sectional view of the liquid crystal display device according to the first embodiment.

  As shown in FIG. 2, the TFT array substrate 30 includes an insulating substrate 31 such as a glass substrate, a gate electrode 32, an auxiliary capacitance wiring 33, a gate insulating film 34 made of a silicon nitride film, a semiconductor layer 35, a source electrode 36, A drain electrode 37, an interlayer insulating film 38, a planarizing film 39, a transparent conductive film 10, a reflective conductive film 20 and the like are provided.

  The pixel electrode 2 formed on the inner surface of the TFT array substrate 30 has a reflection region R and a transmission region T. The reflection region R has a rectangular shape in plan view, and the transmission region T is partitioned in a frame shape outside the reflection region R. Such a pixel electrode is formed in each pixel. The pixel electrode 2 includes a transparent conductive film 10 and a reflective conductive film 20. The transparent conductive film 10 and the drain electrode 37 are connected via the contact hole 6.

  The reflection region R is a region that reflects light incident from the display surface side (opposite substrate 40 side) that is the viewing side so as to pass through a predetermined bidirectional optical path. As shown in FIG. 2, the surface of the reflective region R has an uneven shape due to the uneven pattern 7 formed on the planarizing film 39. The reflective region R according to the first embodiment has a laminated structure of the transparent conductive film 10 and the reflective conductive film 20.

  The transmission region T is a region through which light from the back side (TFT array substrate 30 side) that is the non-viewing side is transmitted to the display surface side through a predetermined unidirectional optical path. The transmissive region T of the pixel electrode 2 is in a region extending from the reflective region R. And it is comprised by the transparent conductive film 10 which consists of an orientation control pattern for controlling the orientation of the liquid crystal layer 3 arrange | positioned in the transmissive area | region T. FIG. The orientation control pattern 11 is a root thick line pattern 12 whose width becomes narrower from the vicinity of the boundary of the reflective region R in the transmissive region T toward the peripheral edge of the transparent conductive film 10, and the orientation control pattern 11 (root thick line pattern). 12) is formed integrally with the transparent conductive film 10 in the reflective region R. The alignment control pattern 11 controls the alignment of the liquid crystal layer 3 in the transmission region T.

  As shown in FIG. 3, the root thick line pattern 12 is formed so that the width W <b> 1 becomes narrower as it approaches the peripheral edge of the transparent conductive film 10. In other words, the width W <b> 2 of the slit 19 formed in the transparent conductive film 10 is formed so as to approach the peripheral edge of the transparent conductive film 10. Further, as shown in FIG. 1, the direction of the root thick line pattern 12 is formed so as to be radial in one pixel in a plan view. Thereby, at the time of voltage application, the liquid crystal in the transmission region T can be radially inclined in one pixel. The root thick line pattern 12 according to the first embodiment includes one linear pattern 12A that does not branch and a branched pattern 12B that has a branched structure.

  On the TFT array substrate 30, as shown in FIG. 4, a counter substrate 40 as a second substrate is arranged. The counter substrate 40 is a color filter substrate, for example, and is disposed on the viewing side. The counter substrate 40 includes an insulating substrate 41, a color filter 42, a black matrix (not shown), a planarization film 43, a counter electrode 44, an alignment control unit 45, an alignment film (not shown), and the like. The liquid crystal layer 3 is sandwiched between the TFT array substrate 30 and the counter substrate 40.

  The alignment control unit 45 provided on the counter substrate 40 is formed as a protruding structure on the upper layer of the counter electrode 44 (see FIG. 4). This can be produced by photolithography using a photosensitive resin. The orientation of the liquid crystal layer 3 disposed in the reflective region R is controlled by the orientation control unit 45 of the counter substrate 40. That is, the alignment control unit 45 can switch the liquid crystal molecules in the reflection region R from the vertical alignment to the multiaxial alignment according to voltage application. The formation position of the orientation control unit 45 is set to a substantially central position of the reflection region R.

  The structure of the alignment controller 45 is not particularly limited as long as the liquid crystal molecules can be switched from the vertical alignment to the uniaxial or multiaxial alignment in response to voltage application as described above. For example, a known configuration such as an alignment control protrusion or an alignment control opening can be disposed on the counter substrate 40 side. Instead of the counter substrate 40 side, the TFT array substrate 30 side may be provided. Moreover, it is not limited to the aspect which forms the one orientation control part 45 with respect to one reflection area R, According to the area and shape of the reflection area R, several orientation control part 45 is provided in one reflection area R. May be provided. In addition, a liquid crystal layer thickness adjusting layer made of a transparent resin or the like is formed in the reflective region R of the counter substrate 40 so that the optical path lengths passing through the liquid crystal layer 3 are substantially the same in the transmissive region T and the reflective region R. Also good.

  On the outer surfaces of the TFT array substrate 30 and the counter substrate 40, a polarizing plate, a retardation plate, etc. (not shown) are provided. A backlight unit (not shown) or the like is disposed on the non-viewing side, which is the outside of the TFT array substrate 30.

  The liquid crystal is driven by an electric field between the pixel electrode 2 and the counter electrode 44. That is, the alignment direction of the liquid crystal layer 3 between the substrates changes. As a result, the polarization state of the light passing through the liquid crystal layer 3 changes. That is, the polarization state of light that has been linearly polarized after passing through the polarizing plate is changed by the liquid crystal layer 3. Specifically, in the transmission region T, the light from the backlight unit is linearly polarized by the polarizing plate. The linearly polarized light passes through the liquid crystal layer 3 to change the polarization state.

  Accordingly, the amount of light passing through the polarizing plate on the counter substrate 40 side varies depending on the polarization state. That is, among the transmitted light that passes through the liquid crystal display panel from the backlight unit, the amount of light that passes through the viewing-side polarizing plate changes. Since the alignment direction of the liquid crystal layer 3 changes depending on the applied display voltage, the amount of light passing through the viewing-side polarizing plate can be changed by controlling the display voltage. That is, a desired image can be displayed by changing the display voltage for each pixel.

  Next, a manufacturing method of the TFT array substrate 30 according to the first embodiment will be described. Note that the examples described below are typical, and it goes without saying that other manufacturing methods can be adopted as long as they meet the spirit of the present invention.

  First, a transparent glass substrate or the like is cleaned as the insulating substrate 31 to clean the surface. Although the thickness of the insulating substrate 31 may be arbitrary, in order to reduce the thickness of the liquid crystal display device 1, a thickness of 1.1 mm or less is preferable. If the insulating substrate 31 is too thin, the substrate is distorted due to various film formations and thermal histories of processes, which causes a problem such as reduced patterning accuracy. Therefore, the thickness of the insulating substrate 31 depends on the process used. It is necessary to select in consideration of. Further, when the insulating substrate 31 is made of a brittle fracture material such as glass, it is preferable to chamfer the end surface of the substrate in order to prevent foreign matter from being mixed due to chipping from the end surface.

  Next, a metal thin film for forming a gate wiring (not shown), the gate electrode 32, the auxiliary capacitance wiring 33, etc. is formed by a method such as sputtering. As the metal thin film, for example, chromium, molybdenum, tantalum, titanium, aluminum, copper, an alloy obtained by adding a small amount of other substances to these, or the like can be used, and a thin film with a thickness of about 100 nm to 500 nm is used. it can. In a preferred embodiment, 200 nm thick aluminum is used.

  Next, the resist is patterned through a process such as coating, exposure, and development by a photoengraving method, and the metal thin film is patterned by an etching process. Thereby, the gate electrode 32, the gate wiring (not shown), the auxiliary capacitance electrode (not shown), the auxiliary capacitance wiring 33, the gate terminal (not shown), and the like are formed. The etching of the metal thin film is preferably performed so that the pattern edge has a tapered shape in order to prevent a short circuit at a step with another wiring.

  Next, a thin film for forming the gate insulating film 34 and the semiconductor layer 35 (semiconductor active film, ohmic contact film) is formed by plasma CVD. As the thin film constituting the gate insulating film 34, a SiNx film, a SiOy film, a SiOzNw film, or a laminated film thereof can be used (where x, y, z, and w are positive numbers). As the semiconductor active film in the semiconductor layer 35, an amorphous silicon (a-Si) film or a polysilicon (p-Si) film is used. As the ohmic contact film, an n-type a-Si film or an n-type p-Si film obtained by doping a-Si or p-Si with a small amount of phosphorus (P) is used.

Next, the semiconductor layer 35 is patterned at least in a portion where the TFT portion is formed by photolithography. The gate insulating film 34 remains throughout. The semiconductor layer 35 can be etched by a known gas composition (for example, a mixed gas of SF ₆ and O ₂ or a mixed gas of CF ₄ and O ₂ ).

  Next, a metal thin film for forming the source electrode 36 and the drain electrode 37 is formed by a method such as sputtering. As the metal thin film, for example, chromium, molybdenum, tantalum, titanium, aluminum, copper, an alloy obtained by adding a small amount of other substances to these, or a laminated film thereof is used. Of course, the above-described materials may be laminated. As a preferred embodiment, an example of forming a chromium film having a thickness of 200 nm can be given.

Subsequently, the metal thin film is patterned by photolithography and etching so that a source wiring (not shown), a source terminal (not shown), a source electrode 36 and a drain electrode 37 are formed. The source electrode 36 is formed over a portion where the source wiring and the gate wiring intersect. Next, the ohmic contact film in the semiconductor layer 35 is etched to expose the semiconductor active film that becomes the channel portion of the TFT. The ohmic contact film can be etched by a known gas composition (for example, a mixed gas of SF ₆ and O ₂ or a mixed gas of CF ₄ and O ₂ ). Through these steps, a TFT is formed.

  Next, a film for forming the interlayer insulating film 38 is formed by plasma CVD. A planarizing film 39 is formed thereon. A film for forming the interlayer insulating film 38 can be formed of the same material as the gate insulating film 34. In the preferred embodiment, 100 nm thick SiN is used. Further, a photosensitive organic film can be suitably used as the planarizing film 39. For example, a positive photosensitive resin composition such as PC335 or PC405 manufactured by JSR Corporation can be used. Of course, a negative photosensitive resin composition may be used. The planarizing film 39 is formed with a thickness of about 3.0 to 4.0 μm, preferably about 3.2 to 3.9 μm. Of course, other thicknesses may be used.

  Next, a pattern is formed by the photoengraving method so as to obtain the desired pattern shape of the planarizing film 39 and the surface of the reflective region R of the planarizing film 39. First, using a light-shielding mask (photomask) having a light transmission region, the planarizing film 39 before pattern formation is uniformly exposed with low illuminance. Subsequently, exposure is performed uniformly with high illuminance using a light shielding mask (not shown) having an opening corresponding to the contact hole 6 as shown in FIG.

  After the exposure step, development is performed using a developer. Thereby, the flattening film 39 in the high illuminance exposure region is completely removed, and the flattening film 39 in the low illuminance exposure part is slightly reduced with respect to the initial film thickness. As a result, the uneven pattern 7 is formed on the surface of the planarizing film 39. The uneven pattern 7 is reflected as an uneven shape for scattering on the surface of a reflective electrode described later. Instead of the method of controlling the pattern shape of the flattening film 39 by changing the illuminance in this way, two different flattening films may be applied and patterned by performing exposure and development sequentially.

  Subsequently, heat treatment is performed as necessary. Thereafter, in the region corresponding to the contact hole 6, the interlayer insulating film 38 is removed by the etching process, and the drain electrode 37 is exposed.

Next, the transparent conductive film 10 is formed by a method such as sputtering. As the transparent conductive film, ITO, SnO ₂ , IZO, or the like can be used. ITO is preferable from the viewpoint of chemical stability. In a preferred embodiment, the transparent conductive film is made of ITO having a thickness of 80 nm.

  Next, a pattern is formed so as to obtain a desired pattern shape of the transparent conductive film 10 by photolithography. Etching of the transparent conductive film can be performed using known wet etching (for example, an aqueous solution in which hydrochloric acid and nitric acid are mixed when the transparent conductive film is made of crystallized ITO) depending on the material used. When the transparent conductive film 10 is ITO, etching by dry etching with a known gas composition (for example, HI, HBr) is also possible. Thereby, the pattern of the transparent conductive film 10 is obtained. The transparent conductive film 10 is electrically connected to the drain electrode 37 through the contact hole 6.

  The transparent conductive film 10 is integrally formed across the reflective region R and the transmissive region T constituting the pixel electrode 2. That is, in the reflection region R, the transparent conductive film 10 without a pattern is disposed over the entire surface. The transparent conductive film 10 extending from the reflective region R to the transmissive region T is integrally formed as one pattern. In the transmissive region T, a pattern having the root thick line pattern 12 as described above is formed. The transparent conductive film 10 is not limited to a single layer, and may be formed of a laminate.

  Subsequently, the reflective conductive film 20 is formed by a method such as sputtering. As the reflective conductive film 20, for example, a metal having a reflection function such as aluminum can be used. As the film thickness, for example, a thin film with a film thickness of about 100 nm to 500 nm can be used. The reflective conductive film 20 is not limited to a single layer and may be formed of a laminated body. After the reflective conductive film 20 is formed, it is patterned to obtain a desired pattern shape.

  Thereafter, an alignment film (not shown) is applied on the pixel electrode, and the TFT array substrate 30 is manufactured. As the alignment film, a vertical alignment film is used. The TFT array substrate 30 manufactured in this way is bonded to the counter substrate 40 by a sealing material (not shown), and liquid crystal is injected into a region surrounded by both substrates and the sealing material.

  In the liquid crystal display device according to the first embodiment, liquid crystal molecules having negative dielectric anisotropy are vertically aligned with respect to the substrate surface, and light modulation is performed by tilting the liquid crystal molecules by applying a voltage. In the reflection region R, since the alignment control unit 45 that controls the alignment of the liquid crystal molecules is provided, the vertically aligned liquid crystal molecules can be inclined radially. On the other hand, in the transmission region T, the root thick line pattern 12 for controlling the alignment of the liquid crystal molecules is arranged radially in one pixel, so that the vertically aligned liquid crystal molecules can be inclined radially. it can. For this reason, a wide viewing angle can be realized.

  Further, the root thick line pattern 12 formed in the transmission region T according to the first embodiment is formed so that the width W1 becomes narrower as it approaches the peripheral edge of the transparent conductive film 10. In other words, even if the flattened film 39 formed in the lower layer of the pixel electrode 2 expands and contracts due to moisture, heat, or the like by thickening the root portion where stress tends to concentrate, the root thick line pattern is generated by the stress. The shape of 12 can be prevented from being deformed or disconnected. Therefore, it is possible to provide a liquid crystal display device in which the alignment control of the liquid crystal layer 3 is stable and the display quality is high. Moreover, the yield fall by disconnection can be suppressed.

  In addition, in the pixel electrode 2 according to the first embodiment, as described in Patent Documents 2 and 3, since there is no narrow connecting portion that connects the sub-pixel electrodes, the reflection between the sub-pixels, There is no invalid area that does not belong to transparency. Therefore, the effective area used for the reflective region and the transmissive region can be widened. For this reason, high contrast can be realized. In addition, since the narrow connecting portion is not provided, there is no problem of deformation or disconnection of the connecting portion due to expansion / contraction due to moisture or heat of the planarizing film 39.

  In the pixel electrode according to the first embodiment, the transmissive region T controls the alignment of the liquid crystal molecules by the root thick line pattern 12. For this reason, in the transmission region T, it is not necessary to provide an alignment control unit such as an alignment control protrusion or an alignment control opening, and the aperture ratio can be improved. That is, high brightness can be realized. Further, in the pixel electrode according to the first embodiment, since the transmissive region T is formed in a frame shape outside the reflective region R, the strength of the orientation control pattern 11 of the transmissive region T is increased and the transmissive region T is increased. Can be efficiently secured. In the present invention, the alignment of the liquid crystal layer 3 can be controlled without providing the alignment control unit on the counter substrate 40 in the transmission region T, and the above-described effects can be obtained. The provision of the orientation control unit is not excluded.

  In the first embodiment, the example in which the alignment direction of the liquid crystal is radially inclined has been described. However, there is no need to radially incline, and there is no need to radially incline, such as one direction, two directions, three directions, four directions, or many others. The same effect can be obtained when tilting in the axial direction. Further, the shape of the root thick line pattern 12 is not limited to the embodiment shown in FIG. 1 as long as the root portion is wider.

  The pattern of the reflection region R is not necessarily a rectangular pattern, and can be various shapes such as a polygon, a circle, and an ellipse without departing from the spirit of the present invention. Further, the example in which the pattern of the reflection region R in one pixel is one has been described, but a pattern divided into a plurality of patterns may be used. Furthermore, in the first embodiment, the example in which the transmission region T is formed in a frame shape outside the reflection region R has been described, but the present invention is not limited to this, and at least one direction of the reflection region R If the transmissive area | region T is formed in the area | region extended in this, the effect of this invention can be acquired.

  Further, the example of the planarizing film is given as the laminated film disposed immediately below the pixel electrode 2, but the present invention is not limited to this, and in the case of other laminated films such as an interlayer insulating film, The effects of the present invention can be obtained. The present invention can be particularly suitably used in an organic film or the like that easily expands and contracts due to moisture or heat.

[Embodiment 2]
Next, an example different from the liquid crystal display device according to the above embodiment will be described. In the following description, the same elements as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  The liquid crystal display device according to the second embodiment has the same basic structure and manufacturing method as those of the first embodiment except for the orientation control pattern 11a of the pixel electrode 2a. FIG. 5 is a schematic partial enlarged plan view of the pixel electrode 2a for one pixel of the TFT array substrate of the liquid crystal display device according to the second embodiment.

  The transmission region T is formed at a position corresponding to the frame body portion in the direction extending from the reflection region R formed in a rectangular shape. The alignment control pattern 11a provided in the transmissive region T is a line pattern 13 composed of the transparent conductive film 10a formed by providing slit-like openings in the transparent conductive film 10a. The line pattern 13 is formed integrally with the transparent conductive film 10a disposed in the reflection region R. In the vicinity of the outer peripheral edge of the transparent conductive film 10a in the transmissive region T, a connection pattern 13A is formed so that at least the adjacent line patterns 13 are electrically connected.

  The connection pattern 13A according to the second embodiment is formed by the transparent conductive film 10a so that the outer peripheral edge thereof has a frame shape. In other words, the line pattern 13 and the connection pattern 13A are formed by providing the slit pattern 18 that is a slit-shaped opening pattern radially on the transparent conductive film 10a in the transmission region T. Thereby, as shown in FIG. 5, the line pattern 13 is formed so as to be radial in one pixel electrode in plan view, and the outer end of the line pattern 13 is electrically connected by the connection pattern 13A. The Thereby, at the time of voltage application, the liquid crystal in the transmission region T can be radially inclined in one pixel. In the reflective region R, similarly to the first embodiment, the reflective region R is formed of a laminated body of the transparent conductive film 10a and the reflective conductive film 20. In the transmission region T, the orientation direction of the liquid crystal layer 3 is controlled by the slit pattern 18.

  The basic manufacturing method of the TFT array substrate according to Embodiment 2 is the same as that of Embodiment 1 except for the following points. That is, in the transparent conductive film 10a in the transmission region T, the slit pattern 18 may be formed so that the line pattern 13 and the connection pattern 13A are formed instead of the root thick line pattern 12 of the first embodiment. Thereafter, the reflective conductive film 20 is formed by the same method as in the first embodiment, and pattern formation is performed. In the second embodiment, the example in which the line pattern 13 and the connection pattern 13A are formed by the transparent conductive film 10a in the same layer has been described. However, the line pattern 13 is formed by the transparent conductive film 10a, and the line pattern 13 You may arrange | position a connection pattern in the upper layer so that at least the adjacent line pattern 13 may electrically connect with an outer side edge part.

  In the liquid crystal display device according to the second embodiment, a wide viewing angle and a high contrast can be realized for the same reason as in the first embodiment. Moreover, since the transmissive region T according to the second embodiment is connected by the connection pattern at the outer peripheral edge of the transmissive conductive film 10a, the strength of the transparent conductive film 10a in the transmissive region T can be increased.

  Therefore, even when the planarizing film 39 formed under the pixel electrode 2a expands and contracts due to moisture, heat, or the like, the shape of the transparent conductive film 10a in the transmission region T is deformed or disconnected due to the stress. Can be suppressed. Even if the line pattern 13 is disconnected, a potential can be supplied through the connection pattern 13A. As described above, it is possible to provide a liquid crystal display device in which the alignment control of the liquid crystal layer 3 is stable and the display quality is high. Moreover, the yield fall by disconnection can be suppressed.

  The alignment control pattern according to the second embodiment has an advantage that the degree of freedom in design of the alignment direction of the line pattern 13 is increased as compared with the above-mentioned Patent Document 1. For example, it is also possible to provide the orientation control pattern 11a in a direction parallel to the side of the reflection region R by providing the slit pattern 18 in a direction parallel to the side of the rectangular reflection region R.

  In the second embodiment, the example in which the alignment direction of the liquid crystal layer 3 is radially inclined has been described. However, there is no need to radially incline, and one axis such as one direction, two directions, three directions, four directions, or the like. The same effect can be obtained when tilting in the multi-axis direction. That is, instead of a mode in which the orientation control pattern is oriented radially, one oriented in one direction, two directions, three directions, four directions, or the like may be used. Further, the shape of the line pattern 13 can be various shapes within a range not departing from the gist of the present invention. For example, a cross-shaped pattern, a branched pattern, or the like may be used.

  Moreover, although the example which comprises the connection pattern 13A by the transparent conductive film 10a was demonstrated, it is not limited to this, The connection pattern 13A is arrange | positioned in the upper layer or lower layer of the transparent conductive film 10a, and the line pattern 13 and The electrical connection may be achieved.

[Embodiment 3]
The liquid crystal display device according to the third embodiment has the same basic structure and manufacturing method as those of the first embodiment except the pixel electrode alignment control pattern. FIG. 6 is a schematic partial enlarged plan view of the pixel electrode for one pixel of the TFT array substrate of the liquid crystal display device according to the third embodiment. For convenience of explanation, the reflective conductive film 20b is illustrated as if it is transparent.

  The reflective region R constituting the pixel electrode 2 is configured in a rectangular shape, and the transmissive region T is partitioned in a frame shape outside the reflective region R. In the third embodiment, the alignment control pattern is radially distributed over the entire circumference of the transparent conductive film 10 from the vicinity of the boundary region of the transmissive region T in the reflective region R toward the peripheral edge of the transparent conductive film 10b in the transmissive region T. An integrated line pattern 14 is formed as 11b. The transparent conductive film 10b formed in the reflective region R and the transmissive region T is integrally formed as one pattern.

  In the first embodiment, the reflective region R has a laminated structure of the transparent conductive film 10 and the reflective conductive film 20 in the entire region. However, in the third embodiment, the peripheral portion of the reflective conductive film 20 is used. In the vicinity region, the integrated line pattern 14 of the transparent conductive film 10b is formed, and there is a region where the transparent conductive film 10b and the reflective conductive film 20 are not laminated. The integrated line pattern 14 according to the third embodiment is configured with the same width from the root portion toward the tip portion. The alignment of the liquid crystal layer 3 in the transmission region T is controlled by the transparent conductive film 10b on which the integrated line pattern 14 is formed.

  The integrated line pattern 14 is formed to be radial in one pixel as in the root thick line pattern 12 according to the first embodiment. Thereby, at the time of voltage application, the liquid crystal in the transmission region T can be radially inclined in one pixel.

  In the liquid crystal display device according to the third embodiment, wide viewing angle and high contrast can be realized for the same reason as in the first embodiment. In addition, the integrated line pattern 14 according to the third embodiment is formed from the vicinity of the boundary portion with the transmission region T in the reflection region R toward the peripheral portion of the transmission region T. Strength can be increased. In other words, the reflective conductive film 20 is superimposed on the root of the integrated line pattern 14 where stress is likely to concentrate, thereby avoiding disconnection due to stress.

  Therefore, it is possible to prevent the shape of the integrated line pattern 14 from being deformed or disconnected when the planarizing film 39 formed under the pixel electrode 2 expands and contracts due to moisture, heat, or the like. it can. Even if the disconnection occurs at the root portion where the stress is likely to concentrate in the integrated line pattern 14, the reflective conductive film 20 is formed immediately above the line pattern 14. A potential can be supplied. As described above, it is possible to provide a liquid crystal display device in which the alignment control of the liquid crystal layer 3 is stable and the display quality is high. Moreover, the yield fall by disconnection can be suppressed.

  In the third embodiment, the example in which the alignment direction of the liquid crystal layer 3 is radially inclined has been described. However, there is no need to radially incline, and one axis such as one direction, two directions, three directions, four directions, Alternatively, the same effect can be obtained when tilting in the multi-axis direction. That is, instead of a mode in which the orientation control pattern is oriented radially, one oriented in one direction, two directions, three directions, four directions, or the like may be used. Further, the shape of the integrated line pattern 14 can be various shapes without departing from the spirit of the present invention.

  Further, the example in which the reflective conductive film 20 is used as the film laminated on the root region of the integrated line pattern 14 has been described. However, the conductive film is superimposed on the root portion of the integrated line pattern 14 where stress is easily concentrated. What is necessary is just to be comprised, and it is not limited to the said example. For example, the conductive film extending from the root portion of the integrated line pattern 14 constituted by the transparent conductive film 10b to the pixel electrode 2 in the reflective region R is laminated on the upper layer or the lower layer of the transparent conductive film 10b, thereby forming the integrated type. The line pattern 14 and the pixel electrode 2 in the reflection region R may be electrically connected.

[Embodiment 4]
The liquid crystal display device according to the fourth embodiment has the same basic structure and manufacturing method as those of the first embodiment except for the alignment control pattern of the pixel electrodes. FIG. 7A is a schematic partial enlarged plan view of a pixel electrode for one pixel of the TFT array substrate of the liquid crystal display device according to the fourth embodiment, and FIG. 7B is a schematic diagram of the TFT array substrate. A cross-sectional view is shown. For convenience of explanation, the reflective conductive film 20c is illustrated as if it were transparent.

  The reflective region R constituting the pixel electrode 2c is configured in a rectangular shape, and the transmissive region T is partitioned in a frame shape outside the reflective region R. In the fourth embodiment, the alignment control pattern radially extends from the vicinity of the boundary region of the transmissive region T in the reflective region R toward the peripheral edge of the transparent conductive film 10c in the transmissive region T over the entire circumference of the transparent conductive film 10c. A divided line pattern 15 is formed as 11c.

  In the transparent conductive film 10c according to the fourth embodiment, unlike the first embodiment, the transparent conductive film 10c formed in the reflective region R and the transmissive region T is not integrally formed as one pattern. That is, in the reflective region R, the transparent conductive film 10c according to the fourth embodiment includes the reflective region pattern 16 formed in the region excluding the peripheral portion of the reflective conductive film 20c and the peripheral portion of the reflective conductive film 20c. It is comprised by the division | segmentation type | mold line pattern 15 arrange | positioned toward the peripheral part of the permeation | transmission area | region T (refer Fig.7 (a), (b)).

  In Embodiment 4 described above, the divided line pattern 15 of the transparent conductive film 10c is formed in the vicinity of the peripheral portion of the reflective conductive film 20c, and the laminated structure of the transparent conductive film 10c and the reflective conductive film 20c is not formed. An area exists. The divided line pattern 15 and the reflection region pattern 16 are divided. The alignment of the liquid crystal layer 3 in the transmissive region T is controlled by the transparent conductive film 10 c formed of the divided line pattern 15.

  The divided line pattern 15 is formed to be radial in one pixel as in the root thick line pattern 12 according to the first embodiment. Thereby, the liquid crystal layer 3 in the transmissive region T can be radially inclined in one pixel when a voltage is applied.

  In the liquid crystal display device according to the fourth embodiment, wide viewing angle and high contrast can be realized for the same reason as in the first embodiment. Further, the transparent conductive film 10 c according to the fourth embodiment is divided into a divided line pattern 15 and a reflective region pattern 16. Thereby, the area where stress is likely to concentrate is divided in advance. The reflective region pattern 16 and the divided line pattern 15 are electrically connected by the reflective conductive film 20c. Therefore, it is possible to prevent the shape of the divided line pattern 15 from being deformed or disconnected when the planarizing film 39 formed under the pixel electrode 2c expands and contracts due to moisture, heat, or the like. it can. As described above, it is possible to provide a liquid crystal display device in which the alignment control of the liquid crystal layer 3 is stable and the display quality is high. Moreover, the yield fall by disconnection can be suppressed.

  In the fourth embodiment, the example in which the alignment direction of the liquid crystal layer 3 is radially inclined has been described. However, there is no need to radially incline, and one axis such as one direction, two directions, three directions, four directions, Alternatively, the same effect can be obtained when tilting in the multi-axis direction. That is, instead of a mode in which the orientation control pattern is oriented radially, one oriented in one direction, two directions, three directions, four directions, or the like may be used. Moreover, the shape of the division | segmentation type line pattern 15 can be made into various shapes in the range which does not deviate from the meaning of this invention. Further, the example in which the divided line pattern 15 and the reflective region pattern 16 are electrically connected through the reflective conductive film 20c has been described, but the present invention is not limited to this, and the divided line pattern is formed by another conductive film. The electrical connection between the pattern 15 and the reflective area pattern 16 may be realized.

[Embodiment 5]
In the liquid crystal display device according to the fifth embodiment, the basic structure and manufacturing method other than the pixel electrode alignment control pattern are the same as those in the first embodiment. FIG. 8 is a schematic partial enlarged plan view of the pixel electrode for one pixel of the TFT array substrate of the liquid crystal display device according to the fifth embodiment. For convenience of explanation, the reflective conductive film 20d is illustrated as if it is transparent.

  The reflection region R constituting the pixel electrode 2d is configured in a rectangular shape, and the transmission region T is formed outside the reflection region R. In the fifth embodiment, the alignment control pattern is radially distributed over the entire circumference of the transparent conductive film 10d from the vicinity of the boundary area of the transmissive area T in the reflective area R toward the peripheral edge of the transparent conductive film 10d in the transmissive area T. A stepped line pattern 17 is formed as 11d. Further, the transparent conductive film 10d formed in the reflective region R and the transmissive region T is integrally formed as one pattern.

  In the first embodiment, the reflective region R has the laminated structure of the transparent conductive film 10 and the reflective conductive film 20 in the entire region. However, in the fifth embodiment, the vicinity of the peripheral portion of the reflective conductive film 20d. The step type line pattern 17 of the transparent conductive film 10d is formed, and there is a region where the transparent conductive film 10d and the reflective conductive film 20d are not laminated. In the step-type line pattern 17 according to the fifth embodiment, the pattern width of the root portion is narrower than the pattern width of the region other than the vicinity of the root portion. The alignment of the liquid crystal layer 3 in the transmissive region T is controlled by the transparent conductive film 10d on which the step type line pattern 17 is formed.

  The stepped line pattern 17 is formed so as to be radial in one pixel as in the root thick line pattern 12 according to the first embodiment. Thereby, the liquid crystal in the transmissive region T is inclined radially in one pixel when a voltage is applied.

  In the liquid crystal display device according to the fifth embodiment, wide viewing angle and high contrast can be realized for the same reason as in the first embodiment. Further, the alignment control pattern (step type line pattern 17) made of the transparent conductive film 10d according to the fifth embodiment narrows the pattern width W3 in the vicinity of the root portion compared to the pattern width W4 in the vicinity of the root portion, In addition, the base of the stepped line pattern 17 is covered with a reflective conductive film 20d.

  In the fifth embodiment, the width of the root portion of the step-type line pattern 17 where stress is likely to concentrate is deliberately narrowed, and a portion that is easily disconnected is intentionally formed. Thereby, it becomes possible to suppress the occurrence of disconnection at other locations. When the disconnection occurs at the portion, the electrical connection of the disconnection portion can be maintained by the reflective conductive film 20d that is coated. Therefore, it is possible to provide a liquid crystal display device in which the alignment control of the liquid crystal layer 3 is stable and the display quality is high. Moreover, the yield fall by disconnection can be suppressed.

  As described above, even when the base portion of the stepped line pattern 17 is deformed or disconnected, a potential can be supplied to the stepped line pattern 17 in the transmissive region by the reflective conductive film 20d. Accordingly, it is possible to prevent the orientation of the liquid crystal layer 3 in the transmissive region T from being lowered when the planarizing film 39 formed under the pixel electrode 2 expands and contracts due to moisture, heat, or the like. As described above, it is possible to provide a liquid crystal display device in which the alignment control of the liquid crystal layer 3 is stable and the display quality is high. Moreover, the yield fall by disconnection can be suppressed.

  In the fifth embodiment, the example in which the alignment direction of the liquid crystal layer 3 is radially inclined has been described. However, there is no need to radially incline, and one axis such as one direction, two directions, three directions, four directions, Alternatively, the same effect can be obtained when tilting in the multi-axis direction. That is, instead of a mode in which the orientation control pattern is oriented radially, one oriented in one direction, two directions, three directions, four directions, or the like may be used.

  Further, the shape of the step-type line pattern 17 can be various shapes without departing from the spirit of the present invention. In addition, the example in which the stepped line pattern 17 is electrically connected via the reflective conductive film 20d has been described, but the present invention is not limited to this, and the root portion of the stepped line pattern 17 is formed by another conductive film. And the reflective conductive film 20d or the transparent conductive film 10d in the reflective region R may be electrically connected.

[Embodiment 6]
The liquid crystal display device according to the sixth embodiment has the same basic structure and manufacturing method as those of the first embodiment except for the alignment control pattern 11 of the pixel electrode 2e. FIG. 9 is a schematic partial enlarged plan view of the pixel electrode for one pixel of the TFT array substrate of the liquid crystal display device according to the sixth embodiment.

  The reflection region R constituting the pixel electrode 2e is formed in a rectangular shape and has a laminated structure of a transparent conductive film 10e and a reflective conductive film 20e. The transmissive region T is formed in a region extending only in the two vertical directions in FIG. 9 of the reflective region R. In the transmissive region T, a root thick line pattern 12 is formed as in the first embodiment. The transparent conductive film 10e forming the root thick line pattern 12 and the transparent conductive film 10e in the reflective region R are integrally formed as one pattern as in the first embodiment. The alignment of the liquid crystal layer 3 in the transmission region T is controlled by the transparent conductive film 10e on which the root thick line pattern 12 is formed.

  In the liquid crystal display device according to the sixth embodiment, a wide viewing angle, a high contrast, an improvement in display quality, and a high yield can be realized for the same reason as in the first embodiment.

[Embodiment 7]
In the liquid crystal display device according to the seventh embodiment, the basic structure and manufacturing method other than the pixel electrode alignment control pattern are the same as those in the sixth embodiment. FIG. 10 is a schematic partial enlarged plan view of the pixel electrode for one pixel of the TFT array substrate of the liquid crystal display device according to the seventh embodiment. The reflection region R constituting the pixel electrode 2f is formed in a rectangular shape and has a laminated structure of a transparent conductive film 10f and a reflective conductive film 20f. The transmissive region T is formed in a region that extends only in two vertical directions in FIG. In the transmissive region T, a root thick line pattern 12f is formed as in the sixth embodiment.

  The base thick line pattern 12f according to the seventh embodiment is formed such that the width in the minor axis direction becomes narrower from the root portion toward the tip portion, and the tip portion has a sharp shape. Further, the root thick line pattern 12f is arranged in one direction as shown in FIG. The transparent conductive film 10f forming the root thick line pattern 12f and the transparent conductive film 10f in the reflective region R are integrally formed as one pattern as in the sixth embodiment. The alignment of the liquid crystal layer 3 in the transmission region T is controlled by the transparent conductive film 10f in which the root thick line pattern 12f is formed.

  In the liquid crystal display device according to the seventh embodiment, a wide viewing angle, a high contrast, an improvement in display quality, and a high yield can be realized for the same reason as in the first embodiment.

[Embodiment 8]
The liquid crystal display device according to the eighth embodiment has the same basic structure and manufacturing method as those of the seventh embodiment except the pixel electrode alignment control pattern. FIG. 11 is a schematic partial enlarged plan view of the pixel electrode for one pixel of the TFT array substrate of the liquid crystal display device according to the eighth embodiment. The reflection region R constituting the pixel electrode 2g is formed in a rectangular shape and has a laminated structure of a transparent conductive film 10g and a reflective conductive film 20g. The transmissive region T is formed in a region extending only in the two vertical directions in FIG. 11 of the reflective region R. In the transmissive region T, a root thick line pattern 12g is formed as in the eighth embodiment.

  The root thick line pattern 12g according to the eighth embodiment is formed so that the width in the minor axis direction becomes narrower as it goes from the root portion toward the tip portion, as in the seventh embodiment. It has a sharp shape. On the other hand, unlike the seventh embodiment, the root thick line pattern 12g according to the eighth embodiment is arranged in two directions as shown in FIG. The transparent conductive film 10g forming the root thick line pattern 12g and the transparent conductive film 10g in the reflective region R are integrally formed as one pattern as in the seventh embodiment. The alignment of the liquid crystal layer 3 in the transmission region T is controlled by the transparent conductive film 10g in which the root thick line pattern 12g is formed.

  In the liquid crystal display device according to the eighth embodiment, a wide viewing angle, a high contrast, an improvement in display quality, and a high yield can be realized for the same reason as in the first embodiment.

[Embodiment 9]
The liquid crystal display device according to the ninth embodiment has the same basic structure and manufacturing method as those of the sixth embodiment except for the alignment control pattern of the pixel electrodes. FIG. 12 is a schematic partial enlarged plan view of the pixel electrode for one pixel of the TFT array substrate of the liquid crystal display device according to the ninth embodiment. The reflection region R constituting the pixel electrode 2h is formed in a rectangular shape and has a laminated structure of a transparent conductive film 10h and a reflective conductive film 20h. The transmissive region T is formed in a region extending only in two directions of the reflective region R in the upward direction and the right direction in FIG. The transmissive region T that is an extended region from the reflective region R in two directions is continuously formed as an integral pattern, and the orientation control pattern extends over the entire transparent conductive film 10h constituting the transmissive region T. Is provided.

  In the orientation control pattern according to the ninth embodiment, a root thick line pattern 12 similar to that of the first embodiment is formed. Further, the transparent conductive film 10e forming the root thick line pattern 12 and the transparent conductive film 10e in the reflective region R are integrally formed as one pattern as in the first embodiment. The alignment of the liquid crystal layer 3 in the transmission region T is controlled by the transparent conductive film 10e on which the root thick line pattern 12 is formed.

  In the liquid crystal display device according to the ninth embodiment, a wide viewing angle, a high contrast, an improvement in display quality, and a high yield can be realized for the same reason as in the first embodiment.

  The above-described first to ninth embodiments are examples, and various modifications can be made without departing from the spirit of the present invention. In addition, it cannot be overemphasized that the aspect of the said Embodiments 1-9 may be mutually combined.

3 is a schematic plan view of a pixel electrode according to Embodiment 1. FIG. 1 is a schematic cross-sectional view of a TFT array substrate according to Embodiment 1. FIG. 2 is a partially enlarged plan view of a pixel electrode according to Embodiment 1. FIG. 1 is a schematic cross-sectional view of a liquid crystal display device according to Embodiment 1. FIG. 6 is a schematic plan view of a pixel electrode according to Embodiment 2. FIG. FIG. 5 is a schematic plan view of a pixel electrode according to Embodiment 3. (A) is a schematic plan view of the pixel electrode according to the fourth embodiment, and (b) is a schematic cross-sectional view of the TFT array substrate according to the fourth embodiment. 6 is a schematic plan view of a pixel electrode according to Embodiment 5. FIG. 10 is a schematic plan view of a pixel electrode according to Embodiment 6. FIG. 10 is a schematic plan view of a pixel electrode according to Embodiment 7. FIG. FIG. 10 is a schematic plan view of a pixel electrode according to an eighth embodiment. 10 is a schematic plan view of a pixel electrode according to Embodiment 9. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Pixel electrode 3 Liquid crystal layer 6 Contact hole 7 Concavity and convexity pattern 10 Transparent conductive film 11 Orientation control pattern 12 Root thick line pattern 13 Line pattern 13A Connection pattern 14 Integrated line pattern 15 Covering line pattern 16 Reflection area pattern 17 Step type line pattern 18 Slit pattern 19 Slit 20 Reflective conductive film 30 TFT array substrate 31 Insulating substrate 32 Gate electrode 33 Auxiliary capacitance wiring 34 Gate insulating film 35 Semiconductor layer 36 Source electrode 37 Drain electrode 38 Interlayer insulating film 39 Flattening film 40 counter substrate 41 insulating substrate 42 color filter 43 counter side planarization film 44 counter electrode 45 orientation controller

Claims (10)

A transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path;
A reflection region for reflecting light incident from the display surface side so as to pass through a predetermined bidirectional optical path;
A first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed;
A second substrate disposed opposite to the first substrate;
A liquid crystal layer sealed between the first substrate and the second substrate,
The transmissive region of the pixel electrode is a region extending from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is disposed in the region. ,
The orientation control pattern is a root thick line pattern whose width becomes narrower from the vicinity of the boundary of the reflective region in the transmissive region toward the periphery of the transparent conductive film,
A liquid crystal display device in which the transparent conductive film disposed in the reflective region and the alignment control pattern are integrally formed. A transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path;
A reflection region for reflecting light incident from the display surface side so as to pass through a predetermined bidirectional optical path;
A first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed;
A second substrate disposed opposite to the first substrate;
A liquid crystal layer sealed between the first substrate and the second substrate,
The transmissive region of the pixel electrode is a region extending from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is disposed in the region. ,
The alignment control pattern is a line pattern composed of the transparent conductive film formed by providing slit-like openings in the transparent conductive film in the transmissive region,
The transparent conductive film disposed in the reflective region and the orientation control pattern are integrally formed, and at least adjacent line patterns are electrically connected to each other in the vicinity of the outer peripheral edge of the transparent conductive film in the transmissive region. A liquid crystal display device in which a connection pattern is formed so as to be connected. A transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path;
A reflection region for reflecting light incident from the display surface side so as to pass through a predetermined bidirectional optical path;
A first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed;
A second substrate disposed opposite to the first substrate;
A liquid crystal layer sealed between the first substrate and the second substrate,
The transmissive region of the pixel electrode is a region extending from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is disposed in the region. ,
The alignment control pattern is a line pattern formed integrally with the transparent conductive film in the reflective region,
The liquid crystal display device, wherein a conductive layer electrically connected to the pixel electrode in the reflective region is coated on a root portion of the line pattern and a layer immediately above the periphery thereof.   The liquid crystal display device according to claim 3, wherein a pattern width in the vicinity of the root portion of the line pattern is narrower than a pattern width in a region other than the vicinity of the root portion. A transmission region that transmits light from the back side to the display surface side through a predetermined unidirectional optical path;
A reflection region for reflecting light incident from the display surface side so as to pass through a predetermined bidirectional optical path;
A first substrate on which a pixel electrode including a transparent conductive film and a reflective conductive film is formed;
A second substrate disposed opposite to the first substrate;
A liquid crystal layer sealed between the first substrate and the second substrate,
The transmissive region of the pixel electrode is a region extending from the reflective region, and the transparent conductive film having an alignment control pattern for controlling the alignment of the liquid crystal layer is disposed in the region. ,
The orientation control pattern is a line pattern separated from the transparent conductive film in the reflective region,
A liquid crystal display device in which a conductive film electrically connected to a pixel electrode in the reflection region is coated on an end portion on the reflection region side of the line pattern and a layer immediately above the periphery thereof.   6. The liquid crystal display device according to claim 3, wherein the conductive film is constituted by the reflective conductive film in the reflective region.   The liquid crystal display device according to claim 1, wherein the immediately lower layer of the transparent conductive film is a planarizing film made of an organic film.   8. The liquid crystal display device according to claim 1, wherein in each of the pixel electrodes, the alignment control pattern is formed radially in a plan view. The reflective region is substantially rectangular,
The transmissive region extends to at least two adjacent sides of the reflective region, and the orientation control pattern is provided over the entire transparent conductive film constituting the transmissive region. Item 9. The liquid crystal display device according to any one of items 1 to 8. The transmission region is partitioned in a frame shape outside the reflection region,
The liquid crystal display device according to claim 1, wherein the alignment control pattern is provided over the entire circumference of the transparent conductive film constituting the transmissive region.

Images