JP2009271389A - Liquid crystal device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a satisfactory display quality of a liquid crystal device with a pixel electrode and a common electrode laminated across an insulation layer. <P>SOLUTION: The liquid crystal device comprises: a pair of substrates holding a liquid crystal layer 52 ; a plurality of pixels which control an alignment state of a liquid crystal layer 52 for each region; first electrodes 12 respectively disposed on the side of the liquid crystal layer 52 of one of the pair of substrates and provided on regions of the plurality of pixels; a second electrode 30 which is laminated via an insulation layer 60 provided on the first electrodes 12, has non-formation parts 26 in the regions provided with the first electrodes 12 and generates electric fields between the first electrodes 12 and the second electrode 30; and a third electrode 32 which is located below the second electrode 30 and provided on at least a part of a region superimposed with the regions not provided with the first electrodes 12, and is electrically connected to the second electrode 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  In an FFS (Fringe Field Switching) type liquid crystal display device (liquid crystal device), both a pixel electrode for controlling the alignment of liquid crystal and a common electrode are provided on the same substrate, and these two electrodes are interposed via an insulating layer. Are stacked. Among the electrodes, the upper electrode, that is, the electrode on the liquid crystal layer side is provided with a slit. When the rubbing process is performed substantially parallel to the longitudinal direction (long side direction) of the slit and the voltage between the electrodes is an off voltage, the liquid crystal molecules are aligned substantially parallel to the longitudinal direction of the slit. When a voltage higher than the off-voltage is applied between the electrodes, an electric field is generated in a direction perpendicular to the long side of the slit, and the liquid crystal molecules rotate in a plane parallel to the substrate along the electric field direction. . The amount of transmitted light is controlled by controlling the rotation angle of the liquid crystal molecules. The FFS method is described in Patent Documents 1 and 2, for example.

JP-A-11-202356 JP 2001-264809 A

  In the FFS system, when there is leakage of an electric field of an adjacent pixel and the leakage of the electric field has an angle with respect to the rubbing direction (direction in which the liquid crystal is aligned), the electric field causes the liquid crystal to move in the direction of the electric field. Light leakage occurs in this region. Conventionally, in order to prevent this light leakage, a black matrix layer is provided in this region. As a result, the area shielded by the black matrix layer is increased, and the aperture ratio of the pixel is reduced.

  Further, when the hues of the display colors of adjacent pixels are different, light leakage occurs in adjacent pixels of different hues, so that color mixing occurs and the display quality is deteriorated.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 Provided on the liquid crystal layer side of one of the pair of substrates, a pair of substrates that sandwich the liquid crystal layer, a plurality of pixels that control the alignment state of the liquid crystal layer for each region, The first electrode provided in each of the plurality of pixel regions and the insulating layer provided on the first electrode are stacked, and the region where the first electrode is provided has a non-formed portion. A second electrode that generates an electric field between the first electrode and at least a part of a region that is lower than the second electrode and overlaps with a region where the first electrode is not provided; A liquid crystal device, comprising: a third electrode electrically connected to the electrode.

  According to this, by providing the third electrode having the same potential as the second electrode between the first electrodes, the influence of the electric field of the first electrode on the adjacent first electrode with the third electrode interposed therebetween is suppressed. Therefore, when adjacent pixels are set to white display or black display, light leakage due to the generation of an electric field between the first electrode of the white display portion and the first electrode of the black display portion is suppressed, and color mixing occurs. Less good display quality can be obtained. In addition, it is possible to suppress a decrease in transmittance during white display due to a limitation during design. In addition, since it is not necessary to block the light exiting region, the aperture ratio of each pixel can be improved.

  Application Example 2 In the liquid crystal device, the region where the first electrode is not provided is a gap region between the first electrode and another first electrode adjacent to the first electrode, 3. The liquid crystal device according to claim 3, wherein the third electrode is formed to extend linearly by sewing a plurality of the gap regions.

  According to this, it is possible to easily suppress the influence of the electric field of the first electrode on the adjacent first electrodes with the third electrode interposed therebetween.

  Application Example 3 In the above-described liquid crystal device, the second electrode has a non-formed portion extending along the third electrode extended in at least a part of a region where the third electrode is formed. A liquid crystal device characterized by that.

  According to this, the second electrode and the third electrode can be easily electrically connected.

  Application Example 4 In the above liquid crystal device, the non-formed portion has an open slit shape, and the longitudinal direction of the slit is parallel to the extending direction of the third electrode. apparatus.

  According to this, compared to the case where the longitudinal direction of each slit extends along the direction orthogonal to the third electrode, the disclination part (display defect part due to the disorder of the arrangement of liquid crystal molecules) generated at the end of the slit is produced. The number can be reduced.

  Application Example 5 In the above liquid crystal device, the non-formed portion has an open slit shape, and the longitudinal direction of the slit is orthogonal to the extending direction of the third electrode. Liquid crystal device.

  According to this, optimization of the width | variety of a slit and the width | variety of an electrode part and said light leakage suppression can be aimed at simultaneously.

  Application Example 6 In the liquid crystal device, the third electrode includes at least a part of a region where a region where the first electrode is not provided and a region where the second electrode is provided overlap. A liquid crystal device, wherein the liquid crystal device is electrically connected to the second electrode through a contact hole provided in the substrate.

  According to this, the second electrode and the third electrode can be efficiently set to the same potential.

  Application Example 7 In the above liquid crystal device, the pixels corresponding to the first electrodes adjacent to each other with the third electrode interposed therebetween have different display colors.

  According to this, the color mixture due to the light leakage can be suppressed. Therefore, it is possible to suppress the reduction of the color gamut due to the color mixture and obtain a good display quality.

  Application Example 8 In the liquid crystal device, the second electrode is a common electrode provided across the adjacent pixels along the extending direction of the third electrode, and the first electrode is A liquid crystal device comprising a pixel electrode connected to each of a plurality of switching elements provided on one substrate.

  According to this, the influence of the electric field of the pixel electrode on the adjacent pixel electrodes with the third electrode interposed therebetween is suppressed. Therefore, it is possible to suppress light leakage at adjacent pixels due to the electric field and to obtain a good display quality.

  Application Example 9 Electronic equipment including the liquid crystal device described above.

  According to this, since the liquid crystal device is mounted, an electronic apparatus having excellent display quality can be provided.

  Hereinafter, a liquid crystal display device will be described as an embodiment of the liquid crystal device with reference to the drawings. In the drawings referred to in each embodiment, each layer and each member are displayed in different scales so that each layer and each member have a size that can be recognized on the drawing.

(First embodiment)
FIG. 1 is a circuit configuration diagram of a plurality of pixel regions formed in a matrix that constitutes the liquid crystal display device 10 according to the present embodiment.
The liquid crystal display device 10 of this embodiment controls the alignment of liquid crystal molecules in the liquid crystal layer using a liquid crystal driving electric field (lateral electric field or oblique electric field method) generated between different electrodes provided on the liquid crystal layer side of the same substrate. This is a liquid crystal display device adopting the FFS method for displaying an image. In addition, a color liquid crystal display device having a color filter layer on a substrate, one color with three pixels that output light of each color of R (red), G (green), and B (blue) as transmitted light. It constitutes a pixel. Therefore, a display area that is a minimum unit constituting the display is referred to as a “pixel area”.

  The liquid crystal display device 10 constitutes an image display area by a plurality of pixel areas formed in a matrix. Each of the plurality of pixel regions is provided with a pixel electrode (first electrode) 12 and a TFT (Thin Film Transistor) 14 (or TFD (Thin Film Diode)) for switching control of the pixel electrode 12. The data line 18 extending from the data line driving circuit 16 is electrically connected to the source of the TFT 14. The data line driving circuit 16 supplies the image signals S1, S2,..., Sn to each pixel via the data line 18. The image signals S1 to Sn may be supplied line-sequentially in this order, or may be supplied for each of a plurality of data lines 18 adjacent to each other.

  Further, a scanning line 22a extending from the scanning line driving circuit 20 is electrically connected to the gate of the TFT 14, and the scanning signal G1 is supplied from the scanning line driving circuit 20 to the scanning line 22a in a pulse manner at a predetermined timing. , G2,..., Gm are applied to the gate of the TFT 14 in the order of lines in this order. The pixel electrode 12 is electrically connected to the drain of the TFT 14. The TFT 14 serving as a switching element is turned on for a certain period by the input of scanning signals G1, G2,..., Gm, so that the image signals S1, S2,. Writing is performed on the pixel electrode 12.

  Image signals S1, S2,..., Sn written to the liquid crystal via the pixel electrode 12 are held for a certain period between the pixel electrode 12 and the common electrode. Here, in order to prevent the held image signal from leaking, a storage capacitor 24 is provided in parallel with the liquid crystal capacitor provided between the common electrode and the pixel electrode 12. The storage capacitor 24 is provided between the drain of the TFT 14 and the capacitor line 22b. Thus, the TFT 14 is provided in the vicinity of the intersection between the data line 18 and the scanning line 22a.

Next, a detailed configuration of the liquid crystal display device 10 will be described with reference to FIGS.
FIG. 2 is a plan configuration diagram in an arbitrary one pixel region of the liquid crystal display device 10 according to the present embodiment. FIG. 3 is a partial cross-sectional configuration diagram taken along the line AA ′ in FIG. 2.
In the pixel region of the liquid crystal display device 10, as shown in FIG. 2, a first common electrode (second electrode) 30 (see FIG. 2) having a plurality of electrode portions 28 arranged with openings (non-formed portions) 26 therebetween. 2, and a pixel electrode 12 having a substantially planar shape that is disposed so as to overlap the first common electrode 30 in a plane.

  The first common electrode 30 is stacked via a second interlayer insulating layer (insulating layer) 60 (see FIG. 3) provided on the pixel electrode 12. The first common electrode 30 has an opening 26 in a region where the pixel electrode 12 is provided. The opening 26 has an open slit shape. The first common electrode 30 generates an electric field between the pixel electrode 12 and the first common electrode 30. The first common electrode 30 is provided across adjacent pixels along the extending direction of the second common electrode (third electrode) 32. In the present embodiment, the first common electrode 30 is provided across adjacent pixels along the y-axis direction. The first common electrode 30 is provided with a plurality of openings 26 extending in parallel to the y-axis direction. The longitudinal direction of the opening 26 is parallel to the extending direction of the second common electrode 32. Thereby, compared to the case where the longitudinal direction of each opening 26 extends along the direction orthogonal to the second common electrode 32, the disclination portion (display due to the disorder of the arrangement of liquid crystal molecules) generated at the end of the opening 26. The number of defective portions can be reduced. The first common electrode 30 has a notch (non-formed part) 33 extending along the extended second common electrode 32 in at least a part of the region where the second common electrode 32 is formed. . The notch 33 has an open slit shape. The longitudinal direction of the notch 33 is parallel to the extending direction of the second common electrode 32. The first common electrode 30 is formed of a conductive film made of a light transmissive conductive material such as ITO (indium tin oxide).

  The second common electrode 32 is provided in at least a part of a region that is lower than the first common electrode 30 and overlaps with a region where the pixel electrode 12 is not provided. The second common electrode 32 is electrically connected to the first common electrode 30. The region where the pixel electrode 12 is not provided is a gap region between the pixel electrode 12 and another pixel electrode 12 adjacent to the pixel electrode 12. The second common electrode 32 is formed to extend linearly by sewing a gap region between the pixel electrode 12 and another pixel electrode 12 adjacent to the pixel electrode 12. The second common electrode 32 is provided in at least a part of a region overlapping with a separation region of adjacent pixel electrodes 12. In the present embodiment, the second common electrode 32 extends between adjacent pixel electrodes 12 in the y-axis direction (data line 18 / extending direction of a wiring for supplying a signal). The first common electrode 30 and the second common electrode 32 are electrically connected via a contact hole 62. The first common electrode 30 and the second common electrode 32 are at the same potential. According to this, the 1st common electrode 30 and the 2nd common electrode 32 can be efficiently made into the same electric potential. The contact hole 62 is provided in at least a part of a region where the region where the pixel electrode 12 is not provided and the region where the first common electrode 30 is provided overlap. The first common electrode 30 is formed of a conductive film made of a light transmissive conductive material such as ITO. The line width of the second common electrode 32 is formed wider than the line width of the overlapping data line 18. The line width of the data line 18 is formed to be narrower than the line width of the overlapping second common electrode 32.

  The pixel electrode 12 is provided in each of a plurality of pixel regions. The pixel electrode 12 is stacked via the first common electrode 30 and the second interlayer insulating layer 60, and is provided on the opposite side of the liquid crystal layer 52 of the first common electrode 30. The pixel electrode 12 is formed of a conductive film made of a light transmissive conductive material such as ITO.

  In the pixel region, a data line 18 extending in the y-axis direction, a scanning line 22a extending in the x-axis direction, and a capacitor line 22b extending adjacent to the scanning line 22a and parallel to the scanning line 22a are provided. A TFT 14 is provided in the vicinity of the intersection of the data line 18 and the scanning line 22a. The TFT 14 includes a semiconductor layer 34 made of amorphous silicon partially provided in the planar region of the scanning line 22a, a source electrode 36 and a drain electrode 38 partially overlapped with the semiconductor layer 34 in plan view. Yes. The scanning line 22a functions as a gate electrode of the TFT 14 at a position overlapping the semiconductor layer 34 in a plan view. The pixel electrode 12 and the TFT 14 are coupled by a contact hole 40. A black matrix layer 42 is provided so as to cover the TFT 14, the data line 18, and the scanning line 22a. A color filter layer 44 is arranged for each pixel region.

  As shown in FIG. 3, the liquid crystal display device 10 includes a liquid crystal layer 52 between an array substrate (one substrate) 48 and a counter substrate (the other substrate) 50 which are a pair of substrates arranged to face each other. This is a sandwiched configuration. The plurality of pixels control the alignment state of the liquid crystal layer 52 for each region. The liquid crystal layer 52 is a region where the array substrate 48 and the counter substrate 50 are opposed to each other, and is provided between the substrates 48 and 50 by a sealing material (not shown) provided along the edges of the substrates 48 and 50. Is sealed. The liquid crystal molecules 46 (see FIG. 2) of the liquid crystal layer 52 are liquid crystal compositions exhibiting positive dielectric anisotropy in which the dielectric constant in the alignment direction is larger than the normal direction. The liquid crystal molecules 46 are anti-parallel rubbed at an angle of 5 ° counterclockwise with respect to the y-axis direction, and the liquid crystal alignment is homogeneous. A backlight (illuminating device) (not shown) is provided on the side opposite to the liquid crystal layer 52 of the array substrate 48 (back side / lower side in the figure).

  In the liquid crystal display device 10 according to the present embodiment, a planar region in which a planar region including the pixel electrode 12 and a planar region provided with the first common electrode 30 overlap each other from the backlight. Then, display is performed by modulating the light transmitted through the liquid crystal layer 52. The liquid crystal layer 52 has a thickness (cell gap) of 3.4 μm (Δnd = 340 nm).

  The array substrate 48 has a substrate body 48a made of glass, quartz, plastic, or the like as a base, and a scanning line 22a and a capacitor line 22b (see FIG. 2) are provided on the substrate body 48a on the liquid crystal layer 52 side. A gate insulating film 54 is provided to cover the scanning line 22a and the capacitor line 22b.

  A semiconductor layer 34 (see FIG. 2) is provided on the liquid crystal layer 52 side of the gate insulating film 54, and a source electrode 36 (see FIG. 2) and a drain electrode 38 (see FIG. 2) so as to partially run over the semiconductor layer 34. 2). The semiconductor layer 34 is disposed to face the scanning line 22a via the gate insulating film 54, and the scanning line 22a forms a gate electrode of the TFT 14 (see FIG. 2) in the facing region.

  A first interlayer insulating layer 56 made of silicon oxide or the like is provided so as to cover the semiconductor layer 34, the source electrode 36, and the drain electrode 38. On the liquid crystal layer 52 side of the first interlayer insulating layer 56, acrylic or the like is formed. A planarizing layer 58 is provided.

  The pixel electrode 12 and the second common electrode 32 are provided on the liquid crystal layer 52 side of the planarization layer 58. The pixel electrode 12 is a flat solid conductive film and is provided over the entire surface of the pixel region. The pixel electrode 12 is provided for each pixel region on the liquid crystal layer 52 side of the array substrate 48.

  The second common electrode 32 is provided below the first common electrode 30. In the present embodiment, it is provided in the same layer as the pixel electrode 12. The second common electrode 32 is provided in at least a part of a region overlapping with a separation region of adjacent pixel electrodes 12. The second common electrode 32 extends between the adjacent pixel electrodes 12 in the y-axis direction (see FIG. 2). The second common electrode 32 and the first common electrode 30 are electrically connected via a contact hole 62 (see FIG. 2). The second common electrode 32 and the first common electrode 30 are at the same potential. Only the array substrate 48 is provided with an electrode structure.

  A second interlayer insulating layer 60 made of silicon oxide or the like is provided so as to cover the pixel electrode 12 and the second common electrode 32. A first common electrode 30 is provided on the liquid crystal layer 52 side of the second interlayer insulating layer 60. The first common electrode 30 is formed of a conductive film having a plurality of electrode portions 28 arranged with the opening 26 interposed therebetween. The first common electrode 30 is provided on the liquid crystal layer 52 side of the array substrate 48 and is disposed so as to overlap the pixel electrode 12 in a plan view. The first common electrode 30 is provided in a region overlapping the pixel electrode 12 in a plan view and is disposed via an insulating layer.

  When a voltage is applied between the first and second common electrodes 30 and 32 having the above-described configuration and the pixel electrode 12, the electrode portion 28 of the first common electrode 30 and the pixel electrode through the opening 26 of the first common electrode 30. 12, and between the second common electrode 32 and the pixel electrode 12, a liquid crystal driving electric field is formed in a plane direction parallel to the x-axis direction (scanning line 22 a / extension direction of the wiring for supplying a signal). .

  A horizontal alignment film (first contact film) 64 made of polyimide, silicon oxide or the like is provided so as to cover the first common electrode 30 and the second interlayer insulating layer 60.

  On the other hand, the counter substrate 50 has a substrate body 50a made of glass, quartz, plastic or the like as a base, and a color filter layer 44 is provided on the liquid crystal layer 52 side of the substrate body 50a. The color filter layer 44 has a plurality of types of colored layers having different colors, and a black matrix layer 42 made of a black resin or the like is disposed between the color filter layers 44 having different color types. The pixels corresponding to the pixel electrodes 12 adjacent to each other with the second common electrode 32 interposed therebetween may have different display colors. Thereby, the color mixture by the said light leakage can be suppressed.

  A planarizing layer 66 is provided on the color filter layer 44 side of the liquid crystal layer 52. The flattening layer 66 is provided on the counter substrate 50 on the liquid crystal layer 52 side in order to flatten the step between the color filter layer 44 and the black matrix layer 42. Thereby, the thickness of the liquid crystal layer 52 is made uniform, and it is possible to prevent the drive voltage from becoming non-uniform in the pixel region and lowering the contrast.

  A horizontal alignment film (second contact film) 68 made of polyimide, silicon oxide or the like is provided so as to cover the planarization layer 66. The horizontal alignment film 68 is provided in contact with the liquid crystal layer 52. The horizontal alignment film 68 is formed by sputtering or the like. The horizontal alignment films 64 and 68 are anti-parallel rubbed at an angle of 5 ° counterclockwise with respect to the y-axis direction.

  First and second polarizing plates 70 and 72 are provided on the outer surface sides of the substrate bodies 48a and 50a, respectively. The transmission axis of the first polarizing plate 70 and the transmission axis of the second polarizing plate 72 are orthogonal to each other. The transmission axis of the first polarizing plate 70 is parallel to the liquid crystal alignment direction.

Attention is paid to the arrangement of the optical axes of the liquid crystal display device 10 of the present embodiment configured as described above.
FIG. 4 is a diagram showing the arrangement of the optical axes of the liquid crystal display device 10 according to the present embodiment. The liquid crystal layer 52 has a homogeneous orientation, a first polarizing plate 70, and a second polarizing plate 72. When the liquid crystal alignment direction 74 is observed from the normal direction of the substrate, it is as shown in FIG. This figure is a top view observed from the normal direction on the array substrate 48 side after the array substrate 48 and the counter substrate 50 are assembled. Reference numeral 76 is drawn parallel to FIG. 2 so as to indicate the orientation of the data line 18. The liquid crystal molecules 46 are anti-parallel rubbed so as to have an angle of 5 ° counterclockwise with respect to the y-axis direction. The transmission axis 70 a of the first polarizing plate 70 and the transmission axis 72 a of the second polarizing plate 72 are orthogonal to each other, and the transmission axis 70 a is parallel to the liquid crystal alignment direction 74. Since this has the same configuration as that of the transmissive IPS (In Plane Switching) system, a wide viewing angle that can withstand monitor applications can be obtained as in the transmissive IPS system.

  Further, since the opening 26 of the first common electrode 30 is parallel to the data line 18, the main direction 78 of the electric field has an inclination of 90 ° with respect to the data line 18. When the azimuth angle is defined counterclockwise, the liquid crystal alignment direction 74 forms −95 ° with respect to the electric field direction. As a result, it is possible to obtain an effect of stabilizing the orientation change at the time of voltage application and reducing the threshold voltage at which the orientation change occurs. The transmission axis 72 a of the second polarizing plate 72 is 90 ° with respect to the liquid crystal alignment direction 74.

  In FIG. 4, the initial alignment direction of the liquid crystal in the liquid crystal layer 52 in the vicinity of the horizontal alignment films 64 and 68 is referred to as a liquid crystal alignment direction for convenience, but the horizontal alignment films 64 and 68 are initially liquid crystal by rubbing treatment. The alignment film is not limited to the one that defines the direction in which the molecules are aligned. For example, it may be an alignment film in which the initial alignment direction of the liquid crystal molecules is defined by photo-alignment or oblique deposition.

  FIG. 5 shows the influence of the electric field between the pixel electrode 12 and the second common electrode 32 of the liquid crystal display device 10 according to the present embodiment with respect to the distance (horizontal axis) from the center between the adjacent pixel electrodes 12 and the luminance ( It is a graph shown by the relationship with a vertical axis | shaft. The vertical axis of the graph is logarithmic notation. A line 110 illustrated in FIG. 5 indicates light leakage when the width between adjacent pixel electrodes 12 is 2 μm and the second common electrode 32 does not exist between the pixel electrodes 12. The line 120 includes a second common electrode 32 having a width of 5 μm between adjacent pixel electrodes 12 and 3 μm between the pixel electrodes 12.

  As shown by the line 120 in FIG. 5, when the second common electrode 32 is provided, when the adjacent pixels are white display (ON) and black display (OFF), the pixel electrode 12 and the black display portion of the white display portion. Light leakage due to an electric field generated between the pixel electrode 12 and the pixel electrode 12 can be suppressed.

  FIG. 6 shows the influence of the electric field between the pixel electrode 12 and the second common electrode 32 of the liquid crystal display device 10 according to the present embodiment with respect to the distance (horizontal axis) from the center between the adjacent pixel electrodes 12 and the luminance ( It is a graph shown by the relationship with a vertical axis | shaft. The vertical axis of the graph is logarithmic notation. In the line 150 shown in FIG. 6, the distance between the second common electrode 32 and the pixel electrode 12 is 2 μm. In the line 160, the distance between the second common electrode 32 and the pixel electrode 12 is 1.5 μm. In the line 170, the distance between the second common electrode 32 and the pixel electrode 12 is 1.0 μm.

  As shown by a line 170 in FIG. 6, when the interval between the second common electrode 32 and the pixel electrode 12 is reduced to make adjacent pixels white display (ON) and black display (OFF), the white display portion It is effective to suppress light leakage caused by an electric field generated between the pixel electrode 12 and the pixel electrode 12 in the black display portion.

  According to the present embodiment, in the FFS method in which the comb electrode is a common electrode, by providing the second common electrode 32 between the pixel electrodes 12, the electric field of the pixel electrode 12 is adjacent to the second common electrode 32. Since the influence on the pixel electrode 12 is suppressed, when an adjacent pixel is displayed in white or black, an electric field is generated between the pixel electrode 12 in the white display portion and the pixel electrode 12 in the black display portion. Good display quality with little color mixing can be obtained by suppressing light leakage. In addition, it is possible to suppress a decrease in transmittance during white display due to a limitation during design. In addition, since it is not necessary to block the light exiting region, the region of the black matrix layer 42 is reduced, and the aperture ratio of each pixel can be improved.

(Second Embodiment)
Next, a second embodiment will be described with reference to the drawings.
FIG. 7 is a plan configuration diagram in an arbitrary one pixel region of the liquid crystal display device 90 according to the present embodiment. FIG. 8 is a partial cross-sectional configuration diagram taken along the line BB ′ of FIG. The liquid crystal display device 90 of the present embodiment is a TFT active matrix transmission type liquid crystal display device, similar to the liquid crystal display device 10 according to the first embodiment. The shape of the electrode 30 (shown by stippling in FIG. 7) and the position where the second common electrode 32 is formed. Accordingly, since the basic configuration of the liquid crystal display device 90 of the present embodiment is the same as that of the liquid crystal display device 10 of the first embodiment, common components are denoted by the same reference numerals, and detailed description thereof is omitted or simplified. To do.

  As shown in FIGS. 7 and 8, the liquid crystal display device 90 of the present embodiment has a configuration in which a liquid crystal layer 52 is sandwiched between an array substrate 48 and a counter substrate 50 that are arranged to face each other.

  The first common electrode 30 is provided across adjacent pixels along the x-axis direction. The longitudinal direction of the opening 26 is orthogonal to the extending direction of the second common electrode 32. Thereby, optimization of the width | variety of the opening part 26 and the width | variety of the electrode part 28, and said light leakage suppression can be aimed at simultaneously.

  The second common electrode 32 extends in the x-axis direction between the pixel electrodes 12 whose short sides are adjacent to each other. The line width of the second common electrode 32 is formed larger than the line width of the overlapping scanning line 22a. The scanning line 22a has a line width narrower than that of the overlapping second common electrode 32.

  When a voltage is applied between the first and second common electrodes 30 and 32 having the above-described configuration and the pixel electrode 12, the electrode portion 28 of the first common electrode 30 and the pixel electrode through the opening 26 of the first common electrode 30. 12, a liquid crystal driving electric field in a plane direction parallel to the x-axis direction is formed. In addition, a liquid crystal driving electric field in a plane direction parallel to the y-axis direction is formed between the second common electrode 32 and the pixel electrode 12.

(Third embodiment)
Next, a third embodiment will be described with reference to the drawings.
FIG. 9 is a plan configuration diagram in an arbitrary one pixel region of the liquid crystal display device 92 according to the present embodiment. FIG. 3 is a partial cross-sectional configuration diagram taken along the line AA ′ in FIG. 9. The liquid crystal display device 92 according to the present embodiment is a TFT active matrix type transmissive liquid crystal display device, similar to the liquid crystal display device 10 according to the first embodiment. It is in the shape of the electrode 30 (shown by stippling in FIG. 9). Accordingly, since the basic configuration of the liquid crystal display device 92 of the present embodiment is the same as that of the liquid crystal display device 10 of the first embodiment, common components are denoted by the same reference numerals, and detailed description thereof is omitted or simplified. To do.

  As shown in FIGS. 9 and 3, the liquid crystal display device 92 of the present embodiment has a configuration in which a liquid crystal layer 52 is sandwiched between an array substrate 48 and a counter substrate 50 that are arranged to face each other.

  The first common electrode 30 is provided with a plurality of openings 26 extending in parallel to the x-axis direction. The longitudinal direction of the opening 26 is orthogonal to the extending direction of the second common electrode 32. Thereby, optimization of the width | variety of the opening part 26 and the width | variety of the electrode part 28, and said light leakage suppression can be aimed at simultaneously.

  The horizontal alignment films 64 and 68 are anti-parallel rubbed (not shown) at an angle of 5 ° counterclockwise with respect to the x-axis direction. The liquid crystal molecules 46 are anti-parallel rubbed so as to have an angle of 5 ° counterclockwise with respect to the x-axis direction. Further, since the opening 26 of the first common electrode 30 is parallel to the scanning line 22a, the main direction 78 of the electric field has an inclination of 90 ° with respect to the scanning line 22a. When the azimuth angle is defined counterclockwise, the liquid crystal alignment direction 74 forms −85 ° with respect to the electric field direction (not shown). As a result, it is possible to obtain an effect of stabilizing the orientation change at the time of voltage application and reducing the threshold voltage at which the orientation change occurs.

  When a voltage is applied between the first and second common electrodes 30 and 32 having the above-described configuration and the pixel electrode 12, the electrode portion 28 of the first common electrode 30 and the pixel electrode through the opening 26 of the first common electrode 30. 12, a liquid crystal driving electric field in a plane direction parallel to the y-axis direction is formed. Further, a liquid crystal driving electric field in a plane direction parallel to the x-axis direction is formed between the second common electrode 32 and the pixel electrode 12.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to the drawings.
FIG. 10 is a plan configuration diagram in an arbitrary one pixel region of the liquid crystal display device 94 according to the present embodiment. FIG. 8 is a partial cross-sectional configuration diagram taken along the line BB ′ of FIG. The liquid crystal display device 94 according to the present embodiment is a TFT active matrix transmission type liquid crystal display device, similar to the liquid crystal display device 10 according to the first embodiment. The shape of the electrode 30 (shown by stippling in FIG. 10) and the formation position of the second common electrode 32 are present. Accordingly, since the basic configuration of the liquid crystal display device 94 of the present embodiment is the same as that of the liquid crystal display device 10 of the first embodiment, common components are denoted by the same reference numerals, and detailed description thereof is omitted or simplified. To do.

  As shown in FIGS. 10 and 8, the liquid crystal display device 94 of this embodiment has a configuration in which a liquid crystal layer 52 is sandwiched between an array substrate 48 and a counter substrate 50 that are arranged to face each other.

  The first common electrode 30 is provided across adjacent pixels along the x-axis direction. The longitudinal direction of the opening 26 is parallel to the extending direction of the second common electrode 32.

  The second common electrode 32 extends in the x-axis direction between the pixel electrodes 12 whose short sides are adjacent to each other.

  When a voltage is applied between the first and second common electrodes 30 and 32 having the above-described configuration and the pixel electrode 12, the electrode portion 28 of the first common electrode 30 and the pixel electrode through the opening 26 of the first common electrode 30. 12, and between the second common electrode 32 and the pixel electrode 12, a liquid crystal driving electric field is formed in a plane direction parallel to the y-axis direction (scanning line 22 a / extension direction of a wiring for supplying a signal). .

(Electronics)
FIG. 11 is a perspective view illustrating an example of an electronic apparatus according to the present embodiment. A mobile phone 100 shown in FIG. 11 includes the liquid crystal display device of the above-described embodiment as a small-sized display unit 102, and includes a plurality of operation buttons 104, an earpiece 106, and a mouthpiece 108.
The liquid crystal display device according to the embodiment 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, and devices equipped with touch panels, etc., and can be suitably used as image display means. In any electronic device, high brightness, high contrast, wide viewing angle Transparent display is possible.

FIG. 3 is a circuit configuration diagram of a plurality of pixel regions formed in a matrix that constitutes the liquid crystal display device according to the first embodiment. FIG. 2 is a plan configuration diagram in an arbitrary pixel region of the liquid crystal display device according to the first embodiment. FIG. 10 is a partial cross-sectional configuration diagram taken along the line A-A ′ of FIGS. 2 and 9. The figure which shows arrangement | positioning of each optical axis of the liquid crystal display device which concerns on 1st Embodiment. 6 is a graph showing the influence of the electric field between the pixel electrode and the second common electrode of the liquid crystal display device according to the first embodiment, based on the relationship between the distance from the center between adjacent pixel electrodes and the luminance. 6 is a graph showing the influence of the electric field between the pixel electrode and the second common electrode of the liquid crystal display device according to the first embodiment, based on the relationship between the distance from the center between adjacent pixel electrodes and the luminance. FIG. 9 is a plan configuration diagram in an arbitrary one pixel region of a liquid crystal display device according to a second embodiment. FIG. 11 is a partial cross-sectional configuration diagram taken along line B-B ′ of FIGS. 7 and 10. FIG. 9 is a plan configuration diagram in an arbitrary one pixel region of a liquid crystal display device according to a third embodiment. FIG. 10 is a plan configuration diagram in an arbitrary one pixel region of a liquid crystal display device according to a fourth embodiment. FIG. 11 is a perspective view illustrating an example of an electronic apparatus according to the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (liquid crystal device) 12 ... Pixel electrode (1st electrode) 14 ... TFT 16 ... Data line drive circuit 18 ... Data line 20 ... Scan line drive circuit 22a ... Scan line 22b ... Capacitance line 24 ... Storage capacity 26 ... Opening portion (non-formed portion) 28 ... Electrode portion 30 ... First common electrode (second electrode) 32 ... Second common electrode (third electrode) 33 ... Notched portion (non-formed portion) 34 ... Semiconductor layer 36 ... Source electrode 38 ... Drain electrode 40 ... Contact hole 42 ... Black matrix layer 44 ... Color filter layer 46 ... Liquid crystal molecule 48 ... Array substrate (one substrate) 48a ... Substrate body 50 ... Counter substrate (the other substrate) 50a ... Substrate body 52 ... Liquid crystal layer 54 ... Gate insulating film 56 ... First interlayer insulating layer 58 ... Planarizing layer 60 ... Second interlayer insulating layer (insulating layer) 62 ... Contact 64 ... Horizontal alignment film 66 ... Flattening layer 68 ... Horizontal alignment film 70 ... First polarizing plate 70a ... Transmission axis 72 ... Second polarizing plate 72a ... Transmission axis 74 ... Liquid crystal alignment direction 78 ... Main direction of electric field 90, 92 , 94 ... Liquid crystal display device 100 ... Mobile phone 102 ... Display unit 104 ... Operation button 106 ... Earpiece 108 ... Mouthpiece.

Claims (9)

A pair of substrates sandwiching a liquid crystal layer;
A plurality of pixels for controlling the alignment state of the liquid crystal layer for each region;
A first electrode provided on the liquid crystal layer side of one of the pair of substrates and provided in each of the plurality of pixel regions;
A second electrode stacked via an insulating layer provided on the first electrode, and having a non-formed portion in a region where the first electrode is provided and generating an electric field with the first electrode; ,
A third electrode that is provided in at least part of a region that overlaps with a region where the first electrode is not provided below the second electrode, and is electrically connected to the second electrode;
A liquid crystal device comprising: The liquid crystal device according to claim 1,
The region where the first electrode is not provided is a gap region between the first electrode and another first electrode adjacent to the first electrode, and the third electrode sews a plurality of the gap regions. A liquid crystal device, wherein the liquid crystal device extends linearly. The liquid crystal device according to claim 1 or 2,
The liquid crystal device, wherein the second electrode has a non-formed portion extending along the third electrode extending in at least a part of a region where the third electrode is formed. The liquid crystal device according to any one of claims 1 to 3,
The liquid crystal device according to claim 1, wherein the non-formed portion has an open slit shape, and a longitudinal direction of the slit is parallel to an extending direction of the third electrode. The liquid crystal device according to any one of claims 1 to 3,
The liquid crystal device according to claim 1, wherein the non-formed portion has an open slit shape, and a longitudinal direction of the slit is orthogonal to an extending direction of the third electrode. The liquid crystal device according to any one of claims 1 to 5,
The third electrode includes the first electrode via a contact hole provided in at least a part of a region where the region where the first electrode is not provided and the region where the second electrode is provided. A liquid crystal device which is electrically connected to two electrodes. The liquid crystal device according to any one of claims 1 to 6,
The liquid crystal device according to claim 1, wherein the pixels corresponding to the first electrodes adjacent to each other with the third electrode interposed therebetween have different display colors. The liquid crystal device according to any one of claims 1 to 7,
The second electrode is a common electrode provided across the adjacent pixels along the extending direction of the third electrode,
The liquid crystal device, wherein the first electrode is a pixel electrode connected to each of a plurality of switching elements provided on the one substrate.   An electronic apparatus comprising the liquid crystal device according to claim 1.

Images