JP2007133193A - Liquid crystal device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device capable of smoothly performing initial transition operation of an OCB mode while suppressing a decrease in an aperture ratio to the minimum. <P>SOLUTION: The liquid crystal device is a transflective liquid crystal device of the OCB mode multi-gap system. A liquid crystal layer 50 thickness adjustment layer 24 for making the thickness of a liquid crystal layer 50 in a reflective display region R smaller than that in a transmissive display region T is provided on a counter substrate 20 in a subpixel. An initial transition structure 55 forming an initial transition core of the liquid crystal layer 50 is provided in a plane area of a step inclination part 70 formed between the reflective display region R and the transmissive display region T due to the liquid crystal layer thickness adjustment layer 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal device and an electronic apparatus.

  In particular, in the field of liquid crystal devices represented by liquid crystal televisions and the like, in recent years, an OCB (Optical Compensated Bend) mode liquid crystal device having a high response speed has been spotlighted for the purpose of improving the quality of moving images. In the OCB mode, in the initial state, the liquid crystal molecules are in a splay alignment that is opened in a splay shape between two substrates, and the liquid crystal molecules must be bent in a bow (bend alignment) during display operation. . That is, high-speed response is realized by modulating the transmittance with the degree of bending of the bend orientation during the display operation.

  As described above, in the case of the OCB mode liquid crystal device, since the liquid crystal is in the splay alignment when the power is shut off, by applying a voltage higher than a certain threshold voltage to the liquid crystal when the power is turned on, the initial splay alignment is changed to the bend alignment in the display operation. A so-called initial transition operation is required to shift the alignment state of the liquid crystal. Here, if the initial transition is not sufficiently performed, display failure may occur or desired high-speed response may not be obtained.

Therefore, in Patent Document 1, a protrusion as an alignment transition means is formed on the surface of the transmissive display electrode in the transflective liquid crystal display device to assist the transition of the liquid crystal molecules from the splay alignment to the bend alignment when a voltage is applied. Techniques to do this have been proposed. In this transflective liquid crystal display device, when the liquid crystal molecules in the transmissive display region are in bend alignment, the liquid crystal molecules in the reflective display region are in a hybrid alignment with the long axis perpendicular to the surface of the reflective display electrode. Controlled. Accordingly, when the panel is driven, the transmissive display area is in the OCB mode, and the reflective display area is in the R-OCB (Reflective-Optical Compensated Bend) mode.
JP 2002-207227 A

  However, the technique described in Patent Document 1 has a problem that alignment failure occurs around the protrusions formed in the transmissive display region during the display operation. Further, if the formation region of the protrusion is covered with a light shielding layer, the aperture ratio is reduced. In addition, since the liquid crystal alignment state in the reflective display region is set to hybrid alignment, it is necessary to make only the alignment film in the reflective display region vertical alignment by photo-alignment processing or the like, which increases the manufacturing process.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a liquid crystal device capable of smoothly performing the initial transition operation in the OCB mode while minimizing deterioration in display quality. To do.
Another object is to provide an electronic device with excellent display quality.

In order to solve the above problems, the liquid crystal device of the present invention includes a first substrate and a second substrate that are arranged to face each other and sandwich a liquid crystal layer, and a reflective display region and a transmissive display region are formed in one pixel. And a liquid crystal layer thickness adjusting layer between the first substrate and the liquid crystal layer, wherein a liquid crystal layer thickness adjusting layer that makes a thickness of the liquid crystal layer in the reflective display region smaller than a thickness of the liquid crystal layer in the transmissive display region A transflective liquid crystal device in which at least the operation mode in the transmissive display region is an OCB mode, and is provided on the surface of the first substrate on the liquid crystal layer side. A step slope is provided between the thick region and the thin region of the liquid crystal layer, and a position overlapping the step slope on the liquid crystal layer side of the first substrate and / or the second. On the liquid crystal layer side of the substrate Wherein the initial transition structure forming an initial transition nucleus of the liquid crystal layer at a position overlapping the serial stepped inclined portion in plan view is provided.
If an initial transition structure is provided and disclination is generated by applying an initial transition voltage, the disclination becomes a transition nucleus and the initial transition proceeds to the periphery. Therefore, the initial transition operation can be performed smoothly.
In general, in the step inclined portion of the liquid crystal layer thickness adjusting layer, the liquid crystal molecules are inclined and aligned, and an oblique electric field is generated. That is, the stepped inclined portion of the liquid crystal layer thickness adjusting layer does not contribute to the improvement of display quality during the display operation. Therefore, by providing an initial transition structure at the step slope part of the liquid crystal layer thickness adjustment layer, even if disclination remains around the initial transition structure, the degradation of display quality during display operation is minimized. Can do. By providing the initial transition structure in such a step inclined portion, it becomes easier to generate disclination than in the case of providing the initial transition structure in other portions. Therefore, the initial transition operation can be performed smoothly.

In the liquid crystal device according to the aspect of the invention, the initial transition structure may be a protrusion protruding from the surface on the first substrate and / or second substrate side toward the liquid crystal layer, or a slit and / or notch formed in the electrode. There can be a certain configuration.
According to the configuration in which the protrusions are formed, initial liquid crystal molecules can be tilted and aligned in various directions, and oblique electric fields in various directions can be generated by applying an initial transition voltage. Thereby, it becomes possible to generate disclination on the surface of the step inclined portion, and the initial transfer operation can be performed smoothly. In addition, according to the configuration in which the slits and / or notches are formed, it is possible to generate oblique electric fields in various directions by applying the initial transition voltage. Thereby, it becomes possible to generate disclination on the surface of the step inclined portion, and the initial transfer operation can be performed smoothly.

  In the liquid crystal device of the present invention, a conductive member, an interlayer insulating film formed on the conductive member, and an electrode formed on the liquid crystal layer side of the interlayer insulating film are provided on the first substrate or the second substrate. The initial transition structure may be a contact hole that electrically connects the electrode and the conductive member via the interlayer insulating film. In the contact hole formation region, a recess that follows the shape of the contact hole is formed on the surface of the substrate. Therefore, the orientation of liquid crystal molecules is likely to be disturbed, and disclinations that become transition nuclei are likely to occur. Therefore, by arranging a contact hole in the planar area of the step inclined portion, it can be used as an initial transition structure.

  In the liquid crystal device according to the aspect of the invention, the second liquid crystal layer thickness adjustment facing the first liquid crystal layer thickness adjustment layer provided on the first substrate is provided on the liquid crystal layer side of the second substrate in the pixel. A layer is formed, and on the surface of the second substrate on the liquid crystal layer side, a stepped inclined portion is provided between a thick region and a thin region of the liquid crystal layer, and the first substrate has the step inclined portion. The step inclined portion provided on the liquid crystal layer side surface and the step inclined portion provided on the liquid crystal layer side surface of the second substrate are arranged to face each other at least partially. The initial transition structure may be provided in the stepped inclined portion of the first substrate and the second substrate in the formed region. Even in such a configuration, it is possible to generate disclination in the step inclined portion by the oblique alignment of the liquid crystal molecules in the step inclined portions facing each other and the formation of the oblique electric field at the time of voltage application. Can be performed smoothly.

The liquid crystal device of the present invention includes a first substrate and a second substrate that are arranged to face each other and sandwich a liquid crystal layer, and a reflective display region and a transmissive display region are formed in one pixel,
Between the first substrate and the liquid crystal layer, there is a liquid crystal layer thickness adjusting layer in the pixel that makes the thickness of the liquid crystal layer in the reflective display region smaller than the thickness of the liquid crystal layer in the transmissive display region. A transflective liquid crystal device that is provided at least in the reflective display area, and at least an operation mode in the transmissive display area is an OCB mode;
On the surface of the first substrate on the liquid crystal layer side, a stepped inclined portion having a bent shape is provided between a thick region and a thin region of the liquid crystal layer, and the liquid crystal layer of the first substrate An initial transition structure for forming an initial transition nucleus of the liquid crystal layer at a position overlapping the step inclination portion on the side in a plane and / or a position overlapping the step inclination portion on the liquid crystal layer side of the second substrate in a plane It is characterized by comprising.
In this way, by forming the step inclined part itself into a bent shape, it is possible to induce alignment disorder of the liquid crystal molecules in the bent part and to generate disclination, so that the initial transition operation can be performed smoothly.

In the liquid crystal device according to the aspect of the invention, the step inclined portion may have a bent shape having two or more bent points. If the bending point is increased, the number of occurrences of disclination increases accordingly, and the initial transition operation can be performed more smoothly.
In the liquid crystal device according to the aspect of the invention, the step inclined portion may have a curved shape in a plan view.

  In the liquid crystal device of the present invention, a contact hole for electrically connecting the electrode and the conductive member is formed in an interlayer insulating film interposed between the electrode for applying a voltage to the liquid crystal layer and another conductive member. In addition, the contact hole may be provided at a position overlapping the bending point of the step inclined portion in a plane. Since both the bent shape stepped portion and the contact hole are places where good disclination is generated, disposing nuclei in a plane overlapping position can generate transition nuclei very efficiently. The initial transition operation can be performed smoothly.

  In the liquid crystal device according to the aspect of the invention, a switching element provided in the pixel and a wiring member electrically connected to the switching element are provided on the first substrate, and the wiring member and the step slope are provided. It can also be set as the structure which overlaps and arrange | positions a part. With such a configuration, the wiring member can be used as a light shielding means for the step slope portion, which contributes to an improvement in the pixel aperture ratio. In addition, the occurrence of disclination in the vicinity of the step slope portion can be induced by the electric field formed in the vicinity of the wiring member, and the initial transition operation can be performed smoothly.

  In the liquid crystal device according to the aspect of the invention, the switching element may be a thin film transistor, and the wiring member disposed so as to overlap the step inclined portion in a plan view may be a scanning line connected to the gate of the thin film transistor. . If a scanning line to which a relatively high voltage pulse is input is arranged in the vicinity of the step slope part, the occurrence of disclination can be induced by the electric field formed around it, and the initial transition operation can be performed smoothly. Can do. In the liquid crystal device according to the aspect of the invention, the storage capacitor is provided in the pixel, and the wiring member arranged to overlap the stepped inclined portion in a plan view is a wiring member constituting the electrode of the storage capacitor. Also good.

In the liquid crystal device of the present invention, it is preferable that an optically anisotropic layer formed by hybrid alignment of an optical medium having a negative refractive index anisotropy is provided on the outer surface side of the first substrate and / or the second substrate. . In this case, the optical medium may have a positive refractive index anisotropy.
In the liquid crystal device according to the aspect of the invention, it is preferable that an optically anisotropic layer optically uniaxial or biaxial is provided on the outer surface side of the first substrate and / or the second substrate.
The liquid crystal device of the present invention preferably includes an optically anisotropic layer formed by combining a uniaxial optical medium having a positive refractive index anisotropy and a uniaxial optical medium having a negative refractive index anisotropy. .
The liquid crystal device of the present invention preferably includes a pair of circularly polarizing plates that sandwich the liquid crystal layer, and more preferably a broadband circularly polarizing plate.

Next, an electronic apparatus according to the present invention includes the liquid crystal device according to the present invention described above.
The liquid crystal device described above can smoothly perform the initial transition operation in the OCB mode while minimizing the deterioration in display quality, and thus can provide an electronic device with excellent display quality.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to the following embodiments. In each drawing referred to in the following description, the scale of each part is appropriately changed and displayed in order to make each component easy to see. Furthermore, in this specification, the liquid crystal layer side in each component of the liquid crystal device is referred to as an inner side, and the opposite side is referred to as an outer side. The minimum unit of image display is referred to as “sub-pixel”, and a set of a plurality of sub-pixels each having a color filter is referred to as “pixel”. Further, in the planar area of the sub-pixel, an area capable of displaying using light incident from the display surface side of the liquid crystal device is referred to as a “reflective display region”, and from the back side of the liquid crystal device (the side opposite to the display surface). An area capable of display using incident light is referred to as a “transmissive display area”. Furthermore, “when non-selection voltage is applied” and “when selection voltage is applied” are respectively “when the applied voltage to the liquid crystal layer is close to the threshold voltage of the liquid crystal” and “the applied voltage to the liquid crystal layer is It means “when sufficiently high compared to the threshold voltage”.

(First embodiment)
First, a liquid crystal device 100 according to a first embodiment of the present invention will be described with reference to FIGS.
The liquid crystal device 100 of this embodiment is an active matrix type liquid crystal device that employs thin film transistors (hereinafter referred to as “TFT”) elements as pixel switching elements. As shown in FIG. 3, the counter substrate 20 disposed on the viewer side, the TFT array substrate 10 disposed opposite thereto, the liquid crystal layer 50 sandwiched between the substrates 10 and 20, and the TFT array substrate 10. The reflective electrode 15r that is provided on the side and reflects light incident from the counter substrate 20 side, and the thickness of the liquid crystal layer 50 in the reflective display region R where the reflective electrode 15r exists are defined as the transmission display region T where the reflective electrode 15r does not exist. And a liquid crystal layer thickness adjusting layer 24 for reducing the thickness of the liquid crystal layer 50 in the multi-gap type transflective liquid crystal device.

FIG. 1A is a plan view of the liquid crystal device viewed from the side of the counter substrate together with each component, and FIG. 1B is a side sectional view taken along the line HH ′ of FIG.
As shown in FIG. 1, in the liquid crystal device 100 of this embodiment, the TFT array substrate 10 and the counter substrate 20 are bonded together by a sealing material 52, and a liquid crystal layer 50 is sealed in a region partitioned by the sealing material 52. ing. In the peripheral circuit area outside the sealing material 52, a data signal driving circuit 101 and an external circuit mounting terminal 102 are formed along one side of the TFT array substrate 10, and scanning signals are formed along two sides adjacent to the one side. A drive circuit 104 is formed. In addition, an inter-substrate conductive material 106 for providing electrical continuity between the TFT array substrate 10 and the counter substrate 20 is disposed at a corner portion of the counter substrate 20.

  FIG. 2 is an equivalent circuit diagram of a liquid crystal device using TFT elements. In the image display area of the liquid crystal device, the data lines 6a and the scanning lines 3a are arranged in a grid pattern, and sub-pixels that are image display units are arranged in the vicinity of their intersections. Pixel electrodes 15 are respectively formed on the plurality of sub-pixels arranged in a matrix. A TFT element 13 which is a switching element for performing energization control to the pixel electrode 15 is formed on the side of the pixel electrode 15. A data line 6 a is electrically connected to the source of the TFT element 13. Image signals S1, S2,..., Sn are supplied to each data line 6a.

  Further, the scanning line 3 a is electrically connected to the gate of the TFT element 13. Scanning signals G1, G2,..., Gn are supplied to the scanning line 3a in pulses at a predetermined timing. The pixel electrode 15 is electrically connected to the drain of the TFT element 13. When the TFT elements 13 serving as switching elements are turned on for a certain period by the scanning signals G1, G2,..., Gn supplied from the scanning line 3a, the image signals S1, S2,. , Sn are written to the liquid crystal of each pixel at a predetermined timing.

  Image signals S1, S2,..., Sn written at a predetermined level on the liquid crystal are held for a certain period by a liquid crystal capacitor formed between the pixel electrode 15 and a common electrode described later. In order to prevent leakage of the held image signals S1, S2,..., Sn, a storage capacitor 7 is formed between the pixel electrode 15 and the capacitor line 3b, and is arranged in parallel with the liquid crystal capacitor. . When a voltage signal is applied to the liquid crystal as described above, the alignment state of the liquid crystal molecules changes according to the applied voltage level. As a result, light incident on the liquid crystal is modulated to enable gradation display.

FIG. 3 is an explanatory diagram of the liquid crystal device according to the present embodiment, FIG. 3A is a plan configuration diagram of one sub-pixel, and FIG. 3B is AA ′ of FIG. FIG.
As shown in FIG. 3A, the above-described data line 6a is arranged along the longitudinal direction of the rectangular pixel electrode 15, and the above-described scanning line 3a is arranged along one short side of the pixel electrode 15. The capacitor lines 3b extending in parallel with the scanning lines 3a are arranged so as to cross the central portion of the pixel electrode 15. A bottom gate type TFT element 13 is formed in the vicinity of the intersection of the data line 6a and the scanning line 3a. The drain electrode 44 of the TFT element 13 is electrically connected to the pixel electrode 15 through the contact hole 14 at a position extending to the pixel electrode 15 side.

  As shown in FIG. 3B, scanning lines 3a and capacitance lines 3b are formed inside the substrate body 11 of the TFT array substrate 10. The insulating thin film 41 covers the scanning lines 3a and the capacitance lines 3b. Is formed. A semiconductor layer 45 made of an amorphous silicon film having a rectangular shape in a plan view is formed at a position facing the scanning line 3a through the insulating thin film 41, and the source electrode 6b and the drain electrode are partially laid on the semiconductor layer 45. 44 is formed on the insulating thin film 41. An interlayer insulating film 12 is formed so as to cover the semiconductor layer 45, the source electrode 6 b, and the drain electrode 44. A contact hole 14 that penetrates the interlayer insulating film 12 and reaches the drain electrode 44 is formed, and a part of the transparent electrode 15 t (pixel electrode 15) formed on the interlayer insulating film 12 is embedded in the contact hole 14. Thus, the transparent electrode 15t and the TFT element 13 are electrically connected.

  On the inner side of the interlayer insulating film 12, a resin layer 16 having irregularities on the surface is formed at one end in the longitudinal direction of a sub-pixel serving as an image display unit. On the surface of the resin layer 16, a reflective electrode (reflective layer) 15r made of a highly reflective metal material such as Al or Ag is formed. Further, a transparent electrode 15t made of a transparent conductive material such as ITO is formed in the remaining portion of the dot region in the longitudinal direction, and the reflective electrode 15r and the transparent electrode 15t are conductively connected to form the pixel electrode 15. ing. The formation region of the reflective electrode 15r defines the reflective display region R in the illustrated subpixel, and the formation region of the transparent electrode 15t defines the transmissive display region T.

  An initial transition structure 55 made of, for example, a protrusion is formed at a position overlapping the capacitor line 3b on the reflective electrode 15r in a plane, and covers the reflective electrode 15r including the initial transition structure 55 and the transparent electrode 15t. An alignment film 18 made of polyimide or the like is formed. In addition, a columnar spacer 59 that restricts the distance between the TFT array substrate 10 and the counter substrate 20 is provided upright at one corner of the subpixel.

  On the other hand, a CF layer 22 including a color filter that transmits different color light for each sub-pixel is formed inside the substrate body 21 of the counter substrate 20. The color filter is preferably divided into two types of color material regions having different chromaticities within the plane region of the sub-pixel. Specifically, a first color material region is provided corresponding to the planar region of the transmissive display region T, and a second color material region is provided corresponding to the planar region of the reflective display region R. A configuration in which the chromaticity of one color material region is larger than the chromaticity of the second color material region can be employed. Moreover, it is good also as a structure which provides a non-colored area | region in a part of reflective display area | region R. FIG. By adopting such a configuration, it is possible to prevent the chromaticity of the display light from being different between the transmissive display region T in which the display light is transmitted only once through the color filter and the reflective display region R in which the display light is transmitted twice. The display quality can be improved by aligning the appearance of the reflective display and the transmissive display. The CF layer 22 can also be formed on the TFT array substrate 10 side.

  A liquid crystal layer thickness adjusting layer 24 for making the thickness of the liquid crystal layer 50 in the reflective display region R smaller than the thickness of the liquid crystal layer 50 in the transmissive display region T is provided inside the CF layer 22. In the transflective liquid crystal device, incident light to the reflective display region R passes through the liquid crystal layer 50 twice, but incident light to the transmissive display region T passes through the liquid crystal layer 50 only once. As a result, if the retardation of the liquid crystal layer 50 is different between the reflective display region R and the transmissive display region T, a difference in light transmittance occurs, and a uniform image display cannot be obtained. Therefore, by providing the liquid crystal layer thickness adjusting layer 24, the layer thickness (for example, about 2 μm) of the liquid crystal layer 50 in the reflective display region R is about half of the layer thickness (for example, about 4 μm) of the liquid crystal layer 50 in the transmissive display region T. Thus, the retardation of the liquid crystal layer 50 in the reflective display region R and the transmissive display region T is set to be substantially the same. In this way, a multi-gap structure is realized by the liquid crystal layer thickness adjusting layer 24, and uniform image display can be obtained in the reflective display region R and the transmissive display region T.

  In the boundary region between the reflective display region R and the transmissive display region T, a stepped inclined portion 70 of the liquid crystal layer thickness adjusting layer 24 is formed. Thereby, the layer thickness of the liquid crystal layer 50 continuously changes from the reflective display region R to the transmissive display region T. The inclination angle of the step inclination portion is about 10 ° to 30 °. In general, in the step inclined portion 70 of the liquid crystal layer thickness adjusting layer 24, the alignment state of liquid crystal molecules is likely to be disturbed, and the display quality is likely to deteriorate. Therefore, the liquid crystal device according to the present embodiment has a configuration in which the transmissive display is emphasized by disposing the step inclined portion 70 in the reflective display region R.

  As a constituent material of the liquid crystal layer thickness adjusting layer 24, it is desirable to employ a material having electrical insulation and photosensitivity such as acrylic resin. By adopting the photosensitive material, patterning using photolithography is possible, and the liquid crystal layer thickness adjusting layer 24 can be formed with high accuracy. The liquid crystal layer thickness adjusting layer 24 can also be provided on the TFT array substrate 10 side.

A common electrode 25 is formed on substantially the entire inner surface of the counter substrate 20 on which the liquid crystal layer thickness adjusting layer 24 is formed, and an alignment film 29 made of polyimide or the like is formed on the surface of the common electrode 25. . The alignment films 18 and 29 are rubbed. The rubbing process is performed in a direction intersecting with the extending direction of the data line 6a (that is, the longitudinal direction of the pixel electrode 15) as indicated by an arrow 19a in FIG.

  As shown in FIG. 3B, a liquid crystal layer 50 that operates in the OCB mode is sandwiched between the TFT array substrate 10 and the counter substrate 20. In the present embodiment, horizontal alignment films are formed in both the transmissive display area T and the reflective display area R, and the liquid crystal layers 50 in the transmissive display area T and the reflective display area R are both operated in the OCB mode.

  FIG. 4 is an explanatory diagram of the alignment state of liquid crystal molecules in the OCB mode liquid crystal device. In the OCB mode, in the initial state shown in FIG. 4B, the liquid crystal molecules 51 are in a splay alignment in which they are opened in a splay shape. In the display operation shown in FIG. 4A, the liquid crystal molecules 51 are bent like a bow (bend alignment). In addition, high-speed response of the display operation can be realized by modulating the transmittance with the degree of bending of the bend orientation during the display operation.

  Returning to FIG. 3A, polarizing plates 36 and 37 are provided outside the pair of substrates 10 and 20, respectively. These polarizing plates 36 and 37 transmit only linearly polarized light that vibrates in a specific direction. The transmission axis of the polarizing plate 36 and the transmission axis of the polarizing plate 37 are arranged so as to be substantially orthogonal to each other, and are arranged so as to intersect the rubbing direction of the alignment films 18 and 29 at about 45 °.

  A phase difference plate 31 and a phase difference plate 32 are disposed inside the polarizing plate 36 and the polarizing plate 37 (on the substrate body side), respectively. If a λ / 4 plate having a phase difference of approximately ¼ wavelength with respect to the wavelength of visible light is used as the phase difference plates 31 and 32, a circularly polarizing plate can be configured together with the polarizing plates 36 and 37. If a λ / 2 plate and a λ / 4 plate are used in combination, a broadband circularly polarizing plate can be configured.

  Furthermore, an optical compensation film can be disposed inside the polarizing plate 36 and / or the polarizing plate 37. By disposing the optical compensation film, it is possible to compensate for the phase difference of the liquid crystal layer when the liquid crystal device is viewed from the front or from the perspective, and it is possible to reduce light leakage and increase contrast. As the optical compensation film, it is possible to use a negative uniaxial medium (for example, WV film made by Fuji Film) formed by hybrid alignment of discotic liquid crystal molecules having negative refractive index anisotropy. It is also possible to use a positive uniaxial medium (for example, NH film manufactured by Nippon Petroleum) formed by hybrid alignment of nematic liquid crystal molecules having a positive refractive index anisotropy. Further, a negative uniaxial medium and a positive uniaxial medium can be used in combination. In addition, a biaxial medium in which the refractive index in each direction satisfies nx> ny> nz, a negative C-Plate, or the like may be used.

  Further, a backlight (illuminating means) 60 having a light source, a reflector, a light guide plate, and the like is installed outside the counter substrate 20.

  As described above, in the case of the OCB mode liquid crystal device, the liquid crystal when the power is shut off is in the splay alignment. Therefore, by applying a voltage higher than a certain threshold voltage to the liquid crystal when the power is turned on, the initial state shown in FIG. From this splay alignment, a so-called initial transition operation is required to transfer the alignment state of the liquid crystal to the bend alignment during the display operation shown in FIG. Here, if the initial transition is not sufficiently performed, display failure may occur or desired high-speed response may not be obtained.

  As an initial transition operation of the liquid crystal layer 50, a pulse voltage of about 15 V is applied between the pixel electrode 15 and the common electrode 25 while the scanning lines are turned on line-sequentially. When the disclination is generated in the sub-pixel by applying the initial transition voltage, the disclination becomes a transition nucleus and the initial transition proceeds to the periphery. Thereby, the initial transition operation can be performed smoothly.

  In this embodiment, in order to generate a disclination that serves as an initial transition nucleus in the sub-pixel, the initial transition structure is provided at a position that overlaps with the stepped inclined portion 70 of the liquid crystal layer thickness adjusting layer 24 illustrated in FIG. Forming. As an initial transition structure, FIG. 3A shows a case where protrusions are provided. Further, as an initial transition structure, a slit and / or a cutout may be formed in the pixel electrode 15 or the common electrode 25 disposed in the planar region of the stepped inclined portion 70.

  FIG. 5A and FIG. 5B are plan views of protrusions that can be formed in the planar region of the step inclined portion 70 as the initial transition structure 55. As the protrusions, those in which initial liquid crystal molecules are tilted and oriented in various directions and an oblique electric field in various directions is generated on the surface of the step inclined portion by applying an initial transition voltage are formed. FIG. 5A shows a case where the island-shaped protrusions 551 are arranged in the plane region of the stepped inclined portion 70. The island-shaped protrusions 551 are formed with a height of 1.2 μm and a diameter of 10 μm, for example. FIG. 5B shows a case where the island-shaped protrusions 552 are arranged in the plane area of the stepped inclined portion 70. Moreover, although not shown in figure, as the projection-shaped initial transition structure 55, the thing which formed the protrusion in the lightning bolt shape by planar view can be illustrated. As a constituent material of these protrusions, it is possible to employ a novolac positive photoresist. By performing post-baking at about 220 ° C. after the development of the resist, a gentle protrusion shape can be obtained.

  By forming such protrusions, it becomes possible to tilt and align the initial liquid crystal molecules in various directions, and by applying an initial transition voltage, oblique electric fields in various directions are applied to the surface of the band-like electrode at the step inclined portion. Can be generated. Along with this, liquid crystal molecules having positive dielectric anisotropy try to reorient along the electric field direction while rotating in various directions from various directions. Thereby, a disclination can be generated on the surface of the step inclined portion. Therefore, the initial transition operation can be performed smoothly.

  FIG. 5C and FIG. 5D are plan configuration diagrams of slits and / or notches that can be formed as the initial transition structure 55 in the planar region of the stepped inclined portion 70. As the slits and / or notches, a slit 553 having a rectangular shape in plan view as shown in FIG. 5C can be formed in the pixel electrode 15 or the common electrode 25 in the planar region of the step inclined portion 70. Alternatively, as shown in FIG. 5 (d), a plurality of slits 554 may be formed in the planar area of the step inclined portion 70. Furthermore, although not shown in the figure, a slit that is bent repeatedly in a crank shape, a bellows-like slit, or a lightning-like slit may be formed. As these slits and / or notches, it is preferable to form a slit capable of generating an oblique electric field in various directions on the surface of the step inclined portion by applying an initial transition voltage. In addition, it is also possible to make a slit and / or a notch into shapes other than the above.

  In this way, if slits and / or notches having various shapes are formed, oblique electric fields in various directions can be applied to the liquid crystal layer 50 in the planar region of the stepped inclined portion 70 by applying the initial transition voltage. It becomes possible. Along with this, liquid crystal molecules having positive dielectric anisotropy try to reorient along the electric field direction while rotating in various directions. Thereby, the disclination can be generated in the plane area of the stepped inclined portion 70. Then, by generating disclination in the step inclined portions of all the dot areas, it becomes possible to initially transfer the alignment state of the liquid crystals in all the dot areas. Therefore, the initial transition operation can be performed smoothly.

In the present embodiment, as shown in FIG. 3A, since the initial transition structure 55 is formed in the planar region of the step inclined portion 70 of the liquid crystal layer thickness adjustment layer 24, after the initial transition operation is completed. Even during the display operation, disclination may remain in the vicinity of the stepped inclined portion 70. However, in general, in the stepped inclined portion 70 of the liquid crystal layer thickness adjusting layer 24, the liquid crystal molecules are inclined and aligned, and an oblique electric field is generated. That is, the stepped inclined portion of the liquid crystal layer thickness adjusting layer does not contribute to the improvement of display quality such as aperture ratio and contrast. Therefore, by providing an initial transition structure in the step inclined portion 70 of the liquid crystal layer thickness adjusting layer 24, even if disclination remains around the initial transition structure, a decrease in display quality during display operation is minimized. Can be suppressed. By providing the initial transition structure in such a stepped inclined portion 70, it becomes easier to generate disclination compared to the case where the initial transition structure is provided in other portions.
In the present embodiment, the capacitor line 3b, which is a metal wiring member, is disposed at a position overlapping the step slope portion 70 in plan view. As a result, the step slope portion 70 becomes a light shielding region in the sub-pixel, Even if disclination remains in such an area or an orientation disorder occurs, the display is not affected.

(Second Embodiment)
Next, a liquid crystal device 200 according to a second embodiment of the present invention will be described with reference to FIG. 6A is a plan configuration diagram of one sub-pixel in the liquid crystal device 200 of the present embodiment, and FIG. 6B is a cross-sectional configuration diagram taken along the line BB ′ in FIG. 6A.
The liquid crystal device 200 of the present embodiment is characterized in that the liquid crystal layer thickness adjusting layer forming the multi-gap structure is provided on both the TFT array substrate 10 and the counter substrate 20 in the liquid crystal device 100 of the previous embodiment. is doing. Therefore, in FIG. 6, the same reference numerals are given to the same components as those of the previous liquid crystal device 100, and a detailed description of the common configurations is omitted in the following description.

  As shown in FIG. 6B, in the liquid crystal device 200 of the present embodiment, the first liquid crystal layer thickness adjusting layer is formed in the region on the substrate body 11 of the TFT array substrate 10 corresponding to the formation region of the reflective electrode 15r. 241 is formed, and a second liquid crystal layer thickness adjusting layer 242 is formed in a region on the substrate body 21 of the counter substrate 20. In the liquid crystal device 200 of the present embodiment, the thickness of the liquid crystal layer 50 in the reflective display region R is adjusted by the first liquid crystal layer thickness adjusting layer 241 and the second liquid crystal layer thickness adjusting layer 242. The liquid crystal layer thickness adjustment layers 241 and 242 are thinner (about half) than the liquid crystal layer thickness adjustment layer 24 provided only on the counter substrate 20 side in the previous liquid crystal device 100.

  On the first liquid crystal layer thickness adjusting layer 241, a resin layer 16 having an uneven shape is formed on the surface, and a reflective electrode (reflective layer) 15r is formed to cover the surface of the resin layer 16. The transparent electrode 15t is formed on the interlayer insulating film 12 in a region outside the first liquid crystal layer thickness adjustment layer 241, and the reflective electrode 15t is formed on the resin layer 16 from the first liquid crystal layer thickness adjustment layer 241. A pixel electrode 15 is formed which extends partially over the transparent electrode 15t via the one stepped inclined portion 71 and is electrically connected to the transparent electrode 15t and the reflective electrode 15r.

  In FIG. 6B, the resin layer 16 for providing the reflective electrode 15r with a concavo-convex shape is formed on the first liquid crystal layer thickness adjusting layer 241. Since it is formed using a resin material, a concavo-convex shape may be formed directly on the surface, and the reflective electrode 15r may be formed on the liquid crystal layer thickness adjusting layer 241 on which the concavo-convex shape is formed. With such a configuration, the process of forming the resin layer 16 can be reduced, and the film thickness of the liquid crystal layer thickness adjusting layer 241 is reduced by processing the uneven shape, so that the cell thickness in the reflective display region R can be reduced. There is an advantage that it is easy to secure.

  On the other hand, the second liquid crystal layer thickness adjusting layer 242 on the counter substrate 20 side is partially formed on the CF layer 22 formed on the inner surface of the substrate main body 21, and the second liquid crystal layer thickness adjusting layer 242 is formed. A common electrode 25 and an alignment film 29 are stacked so as to cover them. The second liquid crystal layer thickness adjustment layer 242 is provided corresponding to the formation region of the reflective electrode 15r on the TFT array substrate 10 side, and the edge of the second liquid crystal layer thickness adjustment layer 242 on the transmissive display region T side. The second step inclined portion 72 formed in the step overlaps the first step inclined portion 71 in plan view.

  In the liquid crystal device 200 having the above configuration, an initial transition structure such as a protrusion or a slit is not provided. However, when a pulse of about 15 V is input between the pixel electrode 15 and the common electrode 25 to perform an initial transition operation, Disclination occurs in a region where the first step inclined portion 71 and the second step inclined portion 72 are opposed to each other, and the initial alignment transition is satisfactorily performed using the disclination as a transition nucleus. ing. This is because the liquid crystal molecules are obliquely aligned in both the first step inclined portion 71 and the second step inclined portion 72 having different inclination directions in the substrate plane direction. Further, both of the substrates 10 and 20 are applied when a voltage is applied. This is because an oblique electric field is generated, so that alignment disorder of the liquid crystal is likely to occur. Therefore, also in the liquid crystal device 200 of the present embodiment, the initial alignment transition of the OCB mode liquid crystal layer 50 can be performed at high speed and smoothly.

  In addition, the present embodiment has an advantage that it is easy to ensure the thickness of the liquid crystal layer 50 by providing the liquid crystal layer thickness adjusting layer on both the TFT array substrate 10 and the counter substrate 20. In the OCB mode, a very large Δn · d is required as compared with a normal mode (VAN (Vertical Aligned Nematic), TN (Twisted Nematic), etc.), and for example, a phase difference of λ / 2 is obtained in a bend alignment state. Therefore, Δn · d in the splay alignment state needs to be 0.9 or more. In order to secure a large Δn · d, there is no choice but to increase the cell thickness or increase the Δn of the liquid crystal. However, if the Δn of the liquid crystal is increased too much, the reliability is lowered, which is limited. Therefore, it is necessary to increase the cell thickness. However, in the OCB mode liquid crystal device, it is difficult to use the gap material because the initial alignment transition is hindered, and it is also difficult to increase the height of the columnar spacer. On the other hand, by providing the liquid crystal layer thickness adjusting layers 241 and 242 on both the substrates 10 and 20 as in this embodiment, it is possible to increase the cell thickness while keeping the height of the columnar spacer relatively low. is there.

  As a specific example, for example, assuming that Δn of the liquid crystal is 0.15 and the required Δn · d is 0.9, the liquid crystal layer thickness in the transmissive display region T is 6 μm, and the liquid crystal layer thickness in the reflective display region R is 3 μm. There is a need. In the case where the liquid crystal layer thickness adjusting layer 24 is provided only on the counter substrate 20 as in the liquid crystal device 100 of the first embodiment, the liquid crystal layer thickness adjusting layer 24 needs to have a thickness of 3 μm and stands in the reflective display region R. The height of the columnar spacer 59 to be provided also needs to be 3 μm. On the other hand, when the liquid crystal layer thickness adjusting layers 241 and 242 are provided as in the present embodiment, each liquid crystal layer thickness adjusting layer is formed with a thickness of 2 μm, and a columnar spacer 59 having a height of 2 μm is formed in the reflective display region R. By standing, a cell thickness of 6 μm can be secured in the transmissive display region T. In this case, the cell thickness in the reflective display region R facing the liquid crystal layer thickness adjusting layers 241 and 242 seems to be 2 μm, but the first liquid crystal layer thickness adjusting layer excluding the region where the columnar spacer 59 is erected By forming an uneven shape on the surface of 241, the thickness of the first liquid crystal layer thickness adjusting layer 241 is reduced by about 0.5 to 1 μm, so that a cell thickness of 2.5 to 3 μm is secured also in the reflective display region R. can do.

  In addition, the present embodiment has an advantage in that the thickness (height) of each of the liquid crystal layer thickness adjusting layers 241 and 242 and the columnar spacer 59 formed of a resin material can be 2 μm. In the method of forming a functional member by applying a photosensitive resin material on a substrate and then patterning it by exposure and development, the film can be formed first or too thinly by coating the photosensitive resin film. This is because non-uniformity in thickness is likely to occur, and it is convenient to ensure the uniformity of the resin film to form a film thickness of about 2 μm.

  In the present embodiment, the capacitor line 3b, which is a metal wiring member, is disposed at a position overlapping the step inclined portions 71 and 72 in plan view. As a result, the step inclined portions 71 and 72 are shielded from light in the sub-pixels. Even if disclination remains in the area or the alignment is disturbed, the display is not affected.

(Third embodiment)
Next, a liquid crystal device 300 according to a third embodiment of the present invention will be described with reference to FIG. FIG. 7A is a plan configuration diagram of one sub-pixel in the liquid crystal device 300 of the present embodiment, and FIG. 7B is a cross-sectional configuration diagram taken along the line DD ′ of FIG.
The liquid crystal device 300 according to the present embodiment is characterized by the shape of the step inclined portion of the liquid crystal layer thickness adjusting layer forming the multi-gap structure in the liquid crystal device 100 according to the previous embodiment. Therefore, in FIG. 7, the same reference numerals are given to the same components as those of the previous liquid crystal device 100, and a detailed description of the common configurations is omitted in the following description.

  As shown in FIG. 7, the liquid crystal layer thickness adjusting layer 24 formed on the counter substrate 20 of the liquid crystal device 300 has a stepped inclined portion 73 on the transmissive display region T side as shown in FIG. The bent shape in plan view. In addition, by having such a shape, disclination as a transition nucleus is generated in the step inclined portion 73 so that the initial alignment transition of the OCB mode liquid crystal layer 50 can be smoothly performed. The reason why the transition nuclei 73 are formed in a bent shape in this way is that transition nuclei can be generated effectively at the bending point 731 shown in FIG. Since an oblique electric field acts on the liquid crystal molecules when a voltage is applied, the alignment disorder of the liquid crystal molecules is likely to occur even when compared with the liquid crystal molecules that are aligned with respect to the linear step inclined portion. .

  FIG. 8 is a plan configuration diagram showing variations in the planar shape of the step inclined portion 73 in the liquid crystal device 300 shown in FIG. FIG. 8A is a plan view of the step inclined portion 73 having a single bending point 731 as shown in FIG. 7, and FIG. 8B has three bending points 732 and meanders. FIG. 8C is a plan view of the step inclined portion 73 having the curved portion 733. FIG. When any one of the stepped inclined portions 73 shown in FIG. 8 is applied, the alignment disorder of the liquid crystal molecules can be effectively generated at the bent portions (curved portions), and the OCB mode liquid crystal layer 50 The initial orientation transition can be smoothly performed. Among the shapes described above, in the form shown in FIG. 8B having a plurality of bent portions 732, the disclination can be generated most effectively at the step inclined portion 73. If the number is increased, it is necessary to shield a wider area, and the pixel aperture ratio is lowered. Therefore, it is preferable to determine the shape of the step inclined portion in balance with display brightness.

(Fourth embodiment)
Next, a liquid crystal device 400 according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 9A is a plan configuration diagram of one sub-pixel in the liquid crystal device 400 of the present embodiment, and FIG. 9B is a cross-sectional configuration diagram along line FF ′ in FIG. 9A.
In the liquid crystal device 400 of this embodiment, in the liquid crystal device 300 of the previous third embodiment, the contact hole 14 is formed at a position overlapping the step inclined portion 73 of the liquid crystal layer thickness adjusting layer 24 that forms the multi-gap structure. It has the feature in the point provided. Therefore, in FIG. 9, the same reference numerals are given to the same components as those of the previous liquid crystal device 300, and the detailed description of the common configurations is omitted in the following description.

  As shown in FIG. 9, in the liquid crystal device 400, the liquid crystal layer thickness adjusting layer 24 of the counter substrate 20 has a stepped inclined portion 73 having a bent shape in plan view, and the TFT elements 13 on the TFT array substrate 10. A contact hole 14 formed in the interlayer insulating film 12 to electrically connect the pixel electrode 15 is formed at a position facing the bending point of the step inclined portion 73. Further, since the contact hole 14 is provided in the central portion of the pixel electrode 15, the scanning line 3 a, the TFT element 13, and the like are also disposed in the central portion of the pixel electrode 15.

  In the liquid crystal device 400 of the present embodiment, the step inclined portion 73 of the liquid crystal layer thickness adjusting layer 24 is bent, and in addition, a contact is made with the TFT array substrate 10 side at a position facing the bending point of the step inclined portion 73. Since the holes 14 are arranged, there are disclination occurrence points at the bending point of the stepped inclined portion 73 and disclination occurrence points due to the concave portions formed on the surface of the TFT array substrate 10 by the contact holes 14. Therefore, the disclination can be generated very efficiently, and the initial alignment transition of the OCB mode liquid crystal layer 50 can be smoothly performed. Further, in the present embodiment, as shown in FIG. 9A, both the bending point of the step inclined portion 73 and the contact hole 14 are disposed in the central portion of the pixel electrode 15, and thus are generated. Since the alignment transition induced by the disclination propagates radially around the pixel electrode 15, the initial alignment transition can be progressed uniformly over the entire planar area of the subpixel, and the alignment transition partially in the subpixel. There will be no defects.

  Further, in the liquid crystal device 400 of the present embodiment, since the scanning line 3a is disposed in the vicinity of the step inclined portion 73 of the liquid crystal layer thickness adjusting layer 24, in the vicinity of the scanning line 3a to which a relatively high voltage pulse is input. Generation of disclination in the vicinity of the step inclined portion 73 can be promoted by the electric field formed in the step, and further speedup of the initial alignment transition can be realized.

(Electronics)
FIG. 10 is a perspective view showing an example of an electronic apparatus according to the invention. A cellular phone 1300 illustrated in FIG. 12 includes the liquid crystal device of the present invention as a small-sized display portion 1301, and includes a plurality of operation buttons 1302, an earpiece 1303, and a mouthpiece 1304. Since the liquid crystal device of the present invention can smoothly perform the initial transition operation in the OCB mode while minimizing the deterioration in display quality, the mobile phone 1300 with excellent display quality can be provided.

  The liquid crystal device of each of the above embodiments is not limited to the mobile phone, but is an electronic book, a personal computer, a digital still camera, a liquid crystal television, a viewfinder type or a monitor direct view type video tape recorder, a car navigation device, a pager, and an electronic notebook. , Calculators, word processors, workstations, videophones, POS terminals, devices equipped with touch panels, etc., can be suitably used as image display means, and any electronic device can display bright and high-contrast images. Yes.

  The technical scope of the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention. That is, the specific materials and configurations described in the embodiments are merely examples, and can be changed as appropriate. For example, in each of the above embodiments, the case where a TFT element is used as the pixel switching element has been described. However, it goes without saying that a TFD element (two-terminal nonlinear element) may be used instead of the TFT element.

1 is an overall configuration diagram of a liquid crystal device according to a first embodiment. FIG. FIG. 2 is a plan configuration diagram and a sectional configuration diagram of a sub-pixel. Explanatory drawing of the orientation state of the liquid crystal of OCB mode. FIG. 4 is a plan configuration diagram illustrating a configuration example of the initial transition structure illustrated in FIG. 3. The figure which shows the liquid crystal device which concerns on 2nd Embodiment. The figure which shows the liquid crystal device which concerns on 3rd Embodiment. The plane block diagram which shows the example of a shape of the level | step difference inclination part of the liquid-crystal layer thickness adjustment layer shown in FIG. The figure which shows the liquid crystal device which concerns on 4th Embodiment. FIG. 11 is a perspective configuration diagram illustrating an example of an electronic device.

Explanation of symbols

  100, 200, 300, 400 Liquid crystal device, R reflective display region, T transmissive display region, 3a scanning line (wiring member), 3b capacitance line (wiring member), 10 TFT array substrate (first substrate), 20 counter substrate ( (Second substrate), 15 pixel electrode, 15r reflective electrode (reflective layer), 15t transparent electrode, 24, 241, 242 liquid crystal layer thickness adjusting layer, 25 counter electrode, 55 initial transition structure, 70, 71, 72, 73 step inclination Part,

Claims (12)

A first substrate and a second substrate that are arranged opposite to each other and sandwich the liquid crystal layer, and a reflective display region and a transmissive display region are formed in one pixel;
Between the first substrate and the liquid crystal layer, there is a liquid crystal layer thickness adjusting layer in the pixel that makes the thickness of the liquid crystal layer in the reflective display region smaller than the thickness of the liquid crystal layer in the transmissive display region. A transflective liquid crystal device that is provided at least in the reflective display area, and at least an operation mode in the transmissive display area is an OCB mode;
On the surface of the first substrate on the liquid crystal layer side, a step inclination portion is provided between a thick region and a thin region of the liquid crystal layer, and the step inclination on the liquid crystal layer side of the first substrate is provided. An initial transition structure for forming initial transition nuclei of the liquid crystal layer is provided at a position that overlaps with the flat portion and / or a position that overlaps with the step inclined portion on the liquid crystal layer side of the second substrate. A liquid crystal device characterized by the above.   The initial transition structure is a protrusion protruding from the surface on the first substrate and / or second substrate side toward the liquid crystal layer, or a slit and / or a notch formed in the electrode. Item 2. A liquid crystal device according to item 1.   A conductive member, an interlayer insulating film formed on the conductive member, and an electrode formed on the liquid crystal layer side of the interlayer insulating film are provided on the first substrate or the second substrate, and the initial transition structure is The liquid crystal device according to claim 1, wherein the liquid crystal device is a contact hole that electrically connects the electrode and the conductive member via the interlayer insulating film. A second liquid crystal layer thickness adjusting layer facing the first liquid crystal layer thickness adjusting layer provided on the first substrate is formed on the liquid crystal layer side of the second substrate in the pixel. On the surface of the two substrates on the liquid crystal layer side, a step slope is provided between a thick region and a thin region of the liquid crystal layer,
The step inclined portion provided on the liquid crystal layer side surface of the first substrate and the step inclined portion provided on the liquid crystal layer side surface of the second substrate are:
2. The initial transition structure according to claim 1, wherein the initial transition structure is provided in at least part of the first substrate and the stepped inclined portion of the second substrate in the opposed region. LCD device. A first substrate and a second substrate that are arranged opposite to each other and sandwich the liquid crystal layer, and a reflective display region and a transmissive display region are formed in one pixel;
Between the first substrate and the liquid crystal layer, there is a liquid crystal layer thickness adjusting layer in the pixel that makes the thickness of the liquid crystal layer in the reflective display region smaller than the thickness of the liquid crystal layer in the transmissive display region. A transflective liquid crystal device that is provided at least in the reflective display area, and at least an operation mode in the transmissive display area is an OCB mode;
On the surface of the first substrate on the liquid crystal layer side, a stepped inclined portion having a bent shape is provided between a thick region and a thin region of the liquid crystal layer, and the liquid crystal layer of the first substrate An initial transition structure for forming an initial transition nucleus of the liquid crystal layer at a position overlapping the step inclination portion on the side in a plane and / or a position overlapping the step inclination portion on the liquid crystal layer side of the second substrate in a plane A liquid crystal device characterized by comprising.   The liquid crystal device according to claim 5, wherein the step inclined portion has the bent shape having two or more bent points.   The liquid crystal device according to claim 5, wherein the step inclined portion has a curved shape in plan view.   A contact hole electrically connecting the electrode and the conductive member is formed in an interlayer insulating film interposed between the electrode for applying a voltage to the liquid crystal layer and another conductive member, and the contact hole is 8. The liquid crystal device according to claim 5, wherein the liquid crystal device is provided at a position overlapping with a bending point of the step inclined portion in a plane. A switching element provided in the pixel and a wiring member electrically connected to the switching element are provided on the first substrate,
9. The liquid crystal device according to claim 1, wherein the wiring member and the step inclined portion are disposed so as to overlap each other in a planar manner.   10. The liquid crystal device according to claim 9, wherein the switching element is a thin film transistor, and the wiring member disposed so as to overlap the step inclined portion in a plane is a scanning line connected to a gate of the thin film transistor. . A storage capacitor is provided in the pixel,
The liquid crystal device according to claim 9, wherein the wiring member disposed so as to overlap the step inclined portion in a plan view is a wiring member constituting the electrode of the storage capacitor.   An electronic apparatus comprising the liquid crystal device according to claim 1.

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