JP2008003372A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device that eliminates asymmetry in viewing angle characteristics, particularly in a lateral direction (horizontal direction) by reinforcing the domain regulating force at an alignment control projection and achieves high-quality image display in a transflective liquid crystal display device having a homogeneous alignment. <P>SOLUTION: The liquid crystal display device has a linear dielectric projection 110 extended along the direction of a short side (lateral direction or scanning direction) of pixels over a plurality of pixels in a pixel unit on a first substrate 114. A liquid crystal layer 121 has positive dielectric anisotropy, with the initial alignment direction of liquid crystal molecules at an angle of 80 to 100 degrees (preferably a right angle (90 degrees)) with respect to the extending direction of the linear dielectric projection 110. A common electrode 119 and a first alignment layer 150 have linear recessed portions 170, 172, respectively, formed at nearly center of the transmissive portion of the pixel and extending along the direction of the short side over a plurality of pixels arranged in the short side direction of the pixel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a transflective type including a reflective display mode for displaying an image with light incident from the observation side and a transmissive display mode for displaying an image with light incident from the opposite side to the observation side. The present invention relates to a liquid crystal display device.

  Since the liquid crystal display device is thin, lightweight, and consumes low power, it is used as a display device for a wide range of information terminal devices such as notebook personal computers, portable information terminals, mobile phones, and digital cameras.

  Unlike a cathode ray tube or a plasma display device, a liquid crystal display device does not emit light itself but displays an image or the like by controlling the amount of light incident from the outside. In addition, by providing a plurality of color filters as the light control element, multicolor image display is possible.

  This type of liquid crystal display device has a liquid crystal composition in which a liquid crystal layer is sandwiched between a pair of substrates (hereinafter also referred to as “first substrate and second substrate”) and the liquid crystal layer is formed by an electric field applied to the liquid crystal layer. An electronic latent image is converted into a visible image by controlling the molecular orientation of physical molecules (liquid crystal molecules).

  Liquid crystal display devices are classified into a simple matrix type and an active matrix type depending on the driving method. Current liquid crystal display devices are mainly active matrix type because they can display high-definition and high-speed images.

  In an active matrix type liquid crystal display device, an active element (switching element) represented by a thin film transistor for pixel selection is provided on a first substrate or a second substrate, and a color display is provided on any substrate. It has color filters that are painted in three colors.

  The reflective liquid crystal display device displays an image with light incident from the observation side, and the transflective liquid crystal display device selects transmitted light incident from the opposite side to the observation side and light incident from the observation side. The image is displayed so that it can be used manually or simultaneously.

  Since the liquid crystal display device is not a self-luminous type, it is necessary to visualize the electronic latent image by illumination with visible light and to emit it as image light on the observation surface. A form in which illumination light such as natural light (external light) is irradiated from the observation surface side is called a reflection type, and a form in which illumination light is irradiated from the opposite side to the observation surface is called a transmission type. Moreover, what has the form which irradiates illumination light from an observation surface side, and the form which irradiates illumination light from an observation surface side is called a semi-transmissive type (semi-transmissive reflection type).

  Patent document 1 can be mentioned as what disclosed this kind of prior art. There are both liquid crystal alignment methods, homeotropic alignment method using homeotropic liquid crystal with negative dielectric anisotropy and homogeneous alignment method using homogeneous liquid crystal with positive dielectric anisotropy. From the viewpoint, it is more advantageous to use a homogeneous liquid crystal having positive dielectric anisotropy, as in Patent Document 1.

However, since the transflective liquid crystal display device disclosed in Patent Document 1 has asymmetrical viewing angle characteristics in the vertical and horizontal directions, color shift occurs in the vertical and horizontal viewing angle directions in color display. As a method for solving this, there is a technique in which the orientation is divided into a plurality of domains such as two domains in a pixel and the viewing angle characteristics of each domain are averaged so as to make the viewing angle characteristics symmetric in the vertical and horizontal directions is there. Patent Document 2 can be cited as a disclosure of this type of prior art in a transmissive liquid crystal display device having a homogeneous alignment method using a liquid crystal material having a positive dielectric anisotropy and having no reflective display function. Further, there is Patent Document 3 regarding a liquid crystal display device in a vertical alignment mode. Moreover, there exists patent document 4 as a liquid crystal display device which this applicant proposes.
JP 2000-187220 A JP 2002-72209 A JP 2005-115143 A Japanese Patent Application No. 2005-247386

  The purpose of making the liquid crystal layer into two domains is to eliminate asymmetry of viewing angle characteristics. In order to eliminate this asymmetry, the present applicant has proposed a method of improving the symmetry of the vertical viewing angle by providing alignment control protrusions on the liquid crystal layer (Patent Document 4). Hereinafter, a previously proposed structure of a liquid crystal display device using a homogeneous liquid crystal having positive dielectric anisotropy will be described with reference to FIGS. FIG. 1 is a plan view of the vicinity of three pixels constituting a liquid crystal display device using a homogeneous liquid crystal having positive dielectric anisotropy. 2 is a cross-sectional view taken along the line AA ′ of FIG. The plan view of FIG. 1 shows a state in which a backlight (not shown), a second substrate 115, a liquid crystal layer 121, and a first substrate 114 shown in FIG. Yes.

  The first substrate 114 shown in FIG. 2 includes a light shielding layer 116, a color filter 117, a color filter removing portion 148, an overcoat film 118, a first linear dielectric protrusion 107, and a second linear dielectric protrusion 110. A common electrode 119 is formed. The second substrate 115 includes a signal wiring 101, a scanning wiring 102, a polycrystalline silicon layer 158, protective films 154, 155, and 157, a gate insulating film 156, a coating type insulating film 151, a source electrode 153, a gate electrode 152, A transparent electrode 106 and a reflective electrode 140 are formed.

  On the surfaces of the first substrate 114 and the second substrate 115, an alignment control film 150 (first substrate side alignment film) and 1501 (second substrate side alignment film) for aligning the liquid crystal molecules 120 are formed. A liquid crystal display device is formed by injecting liquid crystal molecules 120 between both substrates to form a liquid crystal layer 121. Each pixel is arranged at each intersection of the signal wiring 101 and the scanning wiring 102, and 113 indicates a pixel pitch in the long side direction (vertical direction, vertical direction) of the pixel. Note that the pixel pitch in the short side direction (left-right direction, horizontal direction) of the pixel is one third of the pixel pitch 113 in the long side direction.

  A transmission unit that transmits and modulates illumination light from a backlight (not shown) for each pixel and displays an image, and a reflection unit that reflects and modulates external light and displays an image are formed. The transmissive portion of each pixel includes a transparent electrode (transparent pixel electrode) 106, and the first transmissive portion 105 and the second transmissive portion 108 are sandwiched between the first linear dielectric protrusion 107. It is divided into areas. The first linear dielectric protrusion 107 is located on the first substrate 114 and between the common electrode 119 and the liquid crystal layer 121, and is formed in a plurality of pixels in parallel with the scanning wiring 102 in the short side direction of the pixel. It is arranged across.

  The reflection portion 109 is provided with a concavo-convex structure 111 for controlling the reflection / scattering characteristics of external light. In each reflecting portion, a reflecting electrode 140 formed of a metal film mainly composed of aluminum having a high reflectance is formed. The reflective portion 109 is provided with a through hole 112, and the reflective electrode 140 and the transparent electrode 106 are connected to the underlying source electrode 153. The column 103 is a structure for uniformly controlling the thickness of the liquid crystal layer, and is also called a spacer.

  A second linear dielectric protrusion 110 is formed on the first substrate 114 corresponding to the reflective portion 109, and the thickness of the liquid crystal layer 121 of the reflective portion 109 is controlled to about one half that of the transmissive portion. ing. The second linear dielectric protrusion 110 is located between the overcoat film 118 and the common electrode 119 on the first substrate 114.

  Silicon oxide is used as the material for the protective layer 155 and silicon nitride is used as the material for the protective layer 154. Since the refractive index of the protective layer 154 is larger than the refractive index of the protective layer 155 and the coating type insulating film 151, If the layer 154 is present in the transmission part, a reflection loss occurs and the transmittance is reduced. For this reason, the protective layer 154 is removed in the transmission part. A boundary where the protective layer 154 is patterned is shown as a patterning boundary 159 of the protective film 154.

  Next, the liquid crystal alignment direction and tilt-up direction, the role of the linear dielectric protrusion as the alignment control protrusion, and the multi-domain will be described. The alignment direction of the liquid crystal molecules 120 is a homogeneous alignment parallel to the long side direction of the pixel and substantially parallel to each of the first substrate 114 and the second substrate 115. The pretilt angle, which is the angle between the liquid crystal molecules in contact with the substrate and the substrate surface, is desirably as small as possible, and more desirably 0 degrees to 2 degrees or less.

  The tilt-up direction of the liquid crystal molecules is not the direction in which the pretilt angle is given, but the shape of the alignment control structure by the first linear dielectric protrusion 107 and the oblique electric field generated by the second linear dielectric protrusion 110. It is prescribed. Here, the tilt-up direction refers to a lifting side when one end of a rod-like liquid crystal molecule is lifted from a horizontal state on a certain substrate. When the pretilt angle is large, a phenomenon of tilting up in a direction opposite to the tilting up direction defined by the alignment control structure occurs.

  As a means for realizing the pretilt angle of 0 degree, there is a so-called photo-alignment method in which alignment control ability is imparted by irradiating the alignment control film with polarized light. Several photo-alignment methods are known. The photo-alignment method to be used in the present invention is different from the alignment control film by irradiating the alignment control film with polarized light orthogonal to the desired liquid crystal alignment direction. A method of imparting directionality is desirable.

  The liquid crystal molecules 120 shown in FIG. 2 show a state where a certain voltage is applied to the pixel and the pixel is tilted up. In this configuration, how the tilt-up direction of the liquid crystal molecules 120 is controlled in each of the first transmission unit 105 and the second transmission unit 108 will be described below.

  In FIG. 2, the first linear dielectric protrusion 107 is formed between the common electrode 119 and the liquid crystal layer 121. The liquid crystal molecules 120 on the surface of the first linear dielectric protrusion 107 are aligned along the slope of the protrusion, and the surface of the first linear dielectric protrusion 107 and the liquid crystal molecules 120 in the vicinity thereof are aligned with the first substrate 114. Is in the same orientation state as the pretilt angle is given. The first linear dielectric protrusion 107 has a dielectric constant substantially equal to that of the liquid crystal layer 121, and the electric field between the first substrate 114 and the second substrate 115 is substantially perpendicular to the substrate. As a result, the tilt-up direction of the liquid crystal molecules in the vicinity of the surface of the first linear dielectric protrusion 107 is opposite to the left and right of the first linear dielectric protrusion 107 as shown in FIG. The transmission parts 105 and 108 shown in FIG. 5 are multi-domained into two domain regions, and the boundary between the two domain regions is located at the position of the first linear dielectric protrusion 107.

  The second linear dielectric protrusion 110 is formed between the overcoat film 118 and the common electrode 119, and the electric field due to the applied potential is distorted at the end of the second linear dielectric protrusion 110. As a result, an electric field oblique to the normal direction of the substrates 114 and 116 is applied to the liquid crystal layer 121. In addition, since the directions of the oblique electric fields are opposite to each other at both ends of the second linear dielectric protrusion 110, the tilt-up direction of the liquid crystal molecules 120 is also opposite.

  Further, since there is a gap between pixels adjacent in the long side direction of the pixel, the gap between the transparent electrode 106 in the first transmission part 105 and the common electrode 119 on the first substrate 114 and the number of adjacent pixels. Between the transparent electrode 106 and the common electrode 119 on the first substrate 114 in the second transmission part 108, an oblique electric field having an opposite inclination is generated. As a result, the tilt-up direction of the liquid crystal molecules 120 near the end of the second linear dielectric protrusion 110 is controlled as shown in FIG.

  One of the advantages of this configuration is the compatibility between multi-domain and high aperture ratio. The electro-optic characteristic of the region where the first linear dielectric protrusion 107 is located is that the strain due to the thickness of the liquid crystal layer 121 being different from the thickness of the transmission part and the boundary between the two domain regions is concentrated. For the reason, it behaves differently from the electro-optical characteristics at the center of the transmission parts 105 and 108. Therefore, when performing black display, if this region is exposed, the black luminance increases and the contrast ratio decreases. Therefore, in this liquid crystal display device, the first linear dielectric protrusion 107 is shielded from light by the light shielding layer 116.

  As a method of dividing the pixel into two to make a multi-domain, a method of providing a linear dielectric protrusion in the long side direction of the pixel can be considered, but the area of the linear dielectric protrusion in the pixel is widened. The area occupied by the light shielding layer for shielding light also becomes larger. Note that when the first linear dielectric protrusion 107 is not arranged in the short side direction of the pixel as in this configuration, but is arranged in the long side direction, the aperture ratio is reduced as compared with this configuration. .

  Further, as in this configuration, the first linear dielectric protrusion 107 is used to control the thickness of the liquid crystal layer of the reflective portion by dividing the domain region into two by dividing the domain region into two in the long side direction of the pixel. The end face of the provided second linear dielectric protrusion 110 can also be used for orientation control. This acts as an advantage to ensure the aperture ratio, which is the ratio of the transmissive aperture to the entire pixel.

  The purpose of making the liquid crystal layer into two domains is to eliminate asymmetry of viewing angle characteristics. In order to eliminate this asymmetry, the present applicant has proposed a method for improving the symmetry of the vertical viewing angle by providing alignment control protrusions on the liquid crystal layer as described above. In such a configuration, it is necessary to reduce display anomalies in a test by applying a load (so-called push domain test) accompanying improvement in symmetry of the vertical viewing angle provided with alignment control protrusions on the liquid crystal layer. The push domain test is a test in which, for example, a 10 mm diameter indenter is pressed against a liquid crystal display panel that is lit and displayed with a load of 50 N to check whether there is a display abnormality after the load is released. It was found that the abnormal display in the push domain test was caused by the weak domain regulating power of the alignment control protrusion.

  The object of the present invention is to enhance the domain regulating force of the alignment control protrusions in the homogeneously aligned transflective liquid crystal display device, particularly to eliminate the asymmetry of the left and right (horizontal) viewing angle characteristics, An object of the present invention is to provide a liquid crystal display device that realizes quality image display.

  The present invention is a liquid crystal display device having a first substrate, a second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate, and having a plurality of pixels arranged in a matrix. Each of the plurality of pixels includes a pixel electrode, a transmissive portion that performs transmissive display, and a reflective portion that performs reflective display. The first substrate includes a first alignment film, and a common electrode disposed between the first alignment film and the first substrate, and the second substrate includes a second alignment film, The pixel electrode disposed between the second alignment film and the second substrate.

  The first substrate has linear dielectric protrusions extending in the short-side direction across a plurality of pixels arranged in the short-side direction of the pixels on the reflecting portion, and the liquid crystal layer includes The dielectric anisotropy is positive, and the initial alignment direction of the liquid crystal molecules has an angle of 80 degrees to 100 degrees with respect to the extending direction of the linear dielectric protrusion, and the common electrode and the first The alignment film may be provided with a linear concave portion extending in the short side direction across the plurality of pixels arranged in the short side direction of the pixel at substantially the center of the transmissive part.

  In the present invention, the dielectric anisotropy of the liquid crystal molecules constituting the liquid crystal layer can be 7 to 12, and the pretilt angle of the liquid crystal molecules constituting the liquid crystal layer can be 0 to 2 degrees. it can.

  The first substrate of the present invention may have a color filter, and the color filter may be provided with a linear recess at a position corresponding to the linear recess.

  In the present invention, a transparent insulating film can be provided on the first substrate, and a linear recess can be provided at a position corresponding to the linear recess of the transparent insulating film.

  Further, the present invention can be configured such that the common electrode is absent at a position corresponding to the linear recess of the common electrode.

  The dielectric anisotropy Δε of the homogeneous liquid crystal used in the horizontal alignment of the present invention is positive, and Δε = 7 to 12. On the other hand, the dielectric anisotropy Δε of the homeotropic liquid crystal used for vertical alignment (VA) is negative and Δε = −3 to −5. In general, a liquid crystal having positive dielectric anisotropy has a larger absolute value of dielectric anisotropy.

  When homogeneous liquid crystal is used as in the present invention, the time “τon” from application of voltage to completion of operation of the liquid crystal molecules is short, and until the liquid crystal molecules return to the initial state after the applied voltage is removed. In this time “τoff”, the viscosity of the liquid crystal is mainly dominant, and the liquid crystal having a negative dielectric anisotropy is longer. Therefore, the present invention is more advantageous than the vertical alignment.

  In Patent Document 3, the electric field is changed by an alignment control protrusion formed of a dielectric on the electrode. On the other hand, since the recess in the present invention changes the shape of the electrode itself, the change in the electric field is stronger than that caused by the alignment control protrusion, and the influence on the liquid crystal molecules is large. Therefore, even when the domain wall is moved by pressing the panel, the domain control force is strong, so that it becomes possible to newly recreate the domain boundary at the recessed portion, and the domain movement is restricted. This is more effective by using a liquid crystal having a positive dielectric anisotropy and a large absolute value of the dielectric anisotropy, and the influence on the liquid crystal molecules increases synergistically.

  According to the present invention, the push domain regulating power is strengthened, the contrast ratio and display efficiency in transmissive display are high, and the viewing angle characteristic that realizes high-quality image display by eliminating the asymmetry of the viewing angle characteristic in the horizontal direction in particular. It is possible to realize a transflective liquid crystal display device with good objectivity.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings of the embodiments.

  FIG. 3 is a cross-sectional view around one pixel similar to FIG. 2 for explaining the first embodiment of the present invention. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 correspond to the same functional parts, the reference numeral 170 indicates a recess of the common electrode 119, the reference numeral 171 indicates the recess of the color filter 117, and the reference numeral 172 indicates the recess of the alignment film 150 on the first substrate side. Show. The reflection portion is a portion where the thin film transistor 180 is disposed and is in the uneven structure formation region of the through hole 112, and the transmission portion is in the formation region of the flat transparent pixel electrode 116 between the adjacent thin film transistors.

  Hereinafter, the liquid crystal display device of Example 1 will be described in detail with reference to the cross-sectional view of FIG. The liquid crystal display device according to the first embodiment includes a first substrate 114, a second substrate 115, and a liquid crystal layer 121 sandwiched between the first substrate 114 and the second substrate 115. A plurality of pixels are arranged in a matrix by the first substrate 114 and members described later formed on the second substrate 115. That is, each of the plurality of pixels includes a transparent pixel electrode (also referred to as a transparent electrode) 106 and a reflective electrode 140, and the region of the transparent electrode 106 constitutes a transmissive portion that performs transmissive display. This area constitutes a reflection part that performs reflection display.

  The first substrate 114 includes an alignment film (also referred to as a first substrate-side alignment film or a first alignment film) 150 and a common electrode 119 disposed between the first alignment film and the first substrate. Have. The second substrate 115 includes an alignment film (also referred to as a second substrate-side alignment film or a second alignment film) 1501, and a pixel electrode 106 disposed between the second alignment film 1501 and the second substrate 115. have.

  In the first substrate 114, in the short side direction across a plurality of pixels arranged in the reflective portion in the short side direction of the pixel (the horizontal direction in FIG. 1: a direction orthogonal to the long side direction 113). It has a linear dielectric protrusion 110 that extends. The liquid crystal layer 121 has positive dielectric anisotropy, and the initial alignment direction of the liquid crystal molecules is an angle of 80 degrees to 100 degrees with respect to the extending direction of the linear dielectric protrusions 110 (preferably orthogonal: 90 degrees). )have. In the present invention, including Example 1, it will be described as 90 degrees.

  The common electrode 119 and the first alignment film 150 are linear recesses 170 extending in the short-side direction across the plurality of pixels arranged in the short-side direction of the pixel at substantially the center of the transmissive portion. , 172. These linear recesses 170 and 172 are located on the linear recesses of the color filter 117, that is, on the recesses 117 of the overcoat film 118. This portion is on the light shielding layer 116.

  Further, the dielectric anisotropy of the liquid crystal molecules constituting the liquid crystal layer 121 is 7 to 12, and the pretilt angle of the liquid crystal molecules is set to 0 to 2 degrees.

  According to the first embodiment described above, the push domain restricting force is strengthened, the contrast ratio and display efficiency in transmissive display are high, the asymmetry of the viewing angle characteristic in the horizontal direction is particularly eliminated, and the objectivity of the viewing angle characteristic is good. In addition, a transflective liquid crystal display device that realizes high-quality image display is realized.

  FIG. 4 is a cross-sectional view of the vicinity of one pixel similar to FIG. 3 for explaining the second embodiment of the present invention. In FIG. 4, the same reference numerals as those in FIGS. 1 to 3 correspond to the same functional parts, the reference numeral 166 indicates a transparent insulating film, and the reference numeral 173 indicates a missing portion of the transparent insulating film 116 (a concave portion of the transparent insulating film 116). In Example 2, a portion where the concave portion 170 of the common electrode 119 and the concave portion 172 of the first alignment film 150 are formed on the light shielding layer 116 between the first alignment film 150 and the common electrode 119 of the first substrate 114. A transparent insulating film 166 lacking the above is provided. In other words, the recess 170 of the common electrode 119 and the recess 172 of the first alignment film 150 are formed by the lacking portion 173 of the transparent insulating film 166. The other configuration is the same as that of the first embodiment, and therefore will not be described repeatedly.

  Also according to the second embodiment described above, the push domain restricting force is strengthened, the contrast ratio and display efficiency in transmissive display are high, the asymmetry of the viewing angle characteristic in the horizontal direction is particularly eliminated, and the objectivity of the viewing angle characteristic is good. In addition, a transflective liquid crystal display device that realizes high-quality image display is realized.

  FIG. 5 is a cross-sectional view of the vicinity of one pixel similar to FIGS. 3 and 4 for explaining the third embodiment of the present invention. 5, the same reference numerals as those in FIGS. 1 to 4 correspond to the same functional parts, and the reference numeral 174 indicates a recess (groove) of the common electrode 119. In Example 3, the first alignment film 150 is formed by providing a linear recess (groove) 174 extending across a plurality of pixels in the short side direction of the pixel on the common electrode 119 formed on the overcoat film 118. A recess 172 was formed on the surface.

  Also according to the third embodiment described above, the push domain restricting force is strengthened, the contrast ratio and display efficiency in transmissive display are high, the asymmetry of the viewing angle characteristic in the horizontal direction is particularly eliminated, and the objectivity of the viewing angle characteristic is good. In addition, a transflective liquid crystal display device that realizes high-quality image display is realized.

It is a top view of 3 pixel vicinity which comprises the liquid crystal display device using the homogeneous liquid crystal with positive dielectric anisotropy. It is sectional drawing along the AA 'line of FIG. FIG. 3 is a cross-sectional view of the vicinity of one pixel similar to FIG. 2 for explaining the first embodiment of the present invention. It is sectional drawing of 1 pixel vicinity similar to FIG. 3 explaining Example 2 of this invention. It is sectional drawing of 1 pixel vicinity similar to FIG. 3 explaining Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 111 ... Uneven structure, 112 ... Through-hole, 114 ... First substrate, 115 ... Second substrate, 116 ... Light shielding layer, 117 ... Color filter, 118 ... Overcoat 119 ... Common electrode, 121 ... Liquid crystal layer, 150 ... Alignment control film, 151 ... Coating type insulating film, 152 ... Gate electrode, 153 ... Source electrode, 154 ... Protective film, 156... Gate insulating film, 157... Protective film, 158... Polycrystalline silicon layer, 170... Common electrode recess, color filter recess, 172. .

Claims (6)

A liquid crystal display device having a first substrate, a second substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate,
A plurality of pixels arranged in a matrix, each of the plurality of pixels having a pixel electrode, a transmissive portion for performing transmissive display, and a reflective portion for performing reflective display;
The first substrate includes a first alignment film, and a common electrode disposed between the first alignment film and the first substrate,
The second substrate has a second alignment film, and the pixel electrode disposed between the second alignment film and the second substrate,
The first substrate has linear dielectric protrusions extending in the short side direction across a plurality of pixels arranged in the short side direction of the pixels on the reflective portion,
The liquid crystal layer has positive dielectric anisotropy, and the initial alignment direction of the liquid crystal molecules has an angle of 80 degrees to 100 degrees with respect to the extending direction of the linear dielectric protrusions,
The common electrode and the first alignment film have a linear recess extending in the short-side direction across the plurality of pixels arranged in the short-side direction of the pixel at substantially the center of the transmissive portion. A liquid crystal display device comprising: In claim 1,
A liquid crystal display device, wherein the liquid crystal molecules constituting the liquid crystal layer have a dielectric anisotropy of 7 to 12. In either claim 1 or 2,
A liquid crystal display device, wherein a pretilt angle of liquid crystal molecules constituting the liquid crystal layer is 0 to 2 degrees. In any one of Claims 1 thru | or 3,
The first substrate has a color filter;
The liquid crystal display device, wherein the color filter has a linear recess at a position corresponding to the linear recess. In any one of Claims 1 thru | or 4,
The first substrate has a transparent insulating film,
The liquid crystal display device, wherein the transparent insulating film has a linear recess at a position corresponding to the linear recess. In any one of Claims 1 thru | or 3,
The liquid crystal display device according to claim 1, wherein the common electrode lacks the common electrode at a position corresponding to the linear recess.

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