Patent Abstract:
A display device comprises spacers provided between a first substrate and a second substrate, wherein the first substrate includes: seats each of which holds the spacers, respectively; data lines; gate lines; thin film transistors; pixel electrodes corresponding to pixel regions; a common electrode facing the pixel electrodes; and common wirings being electrically connected to the common electrode, and each of the common wirings includes a bent part detouring around at least one of the seats.

Full Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority from Japanese application JP2015-202477, filed Oct. 13, 2015. This Japanese application is incorporated herein by reference. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to a display device. 
       BACKGROUND 
       [0003]    In a liquid crystal display device, light transmission is controlled by alignment of liquid crystal sealed between first and second substrates, thereby displaying an image. The first substrate includes a plurality of data lines extending in a column direction, a plurality of gate lines extending in a row direction, and a plurality of thin film transistors formed near intersection parts of the pluralities of data lines and gate lines. In an in plane switching (IPS)-system liquid crystal display device, the first substrate includes a pixel electrode and a common electrode. 
         [0004]    In the liquid crystal display device, a plurality of spacers are disposed in order to hold a distance (gap) between the first substrate and the second substrate. A seat is formed in the first substrate, a spacer is formed in the second substrate, and the first substrate and the second substrate adhere to each other such that the seat and the spacer contact with each other, thereby holding the gap. Desirably, the spacer is disposed at a position where a numerical aperture of the pixel is not degraded. For example, JP 2002-196338 A discloses a spacer disposed between two adjacent thin film transistors. Japanese unexamined patent application publication JP2009-12229A discloses a counter voltage signal line (common wiring) that is formed along a running direction of the gate line while superposed on the gate line in order to improve a numerical aperture of a pixel, the counter voltage signal line supplying a reference signal to a counter electrode (common electrode). 
       SUMMARY 
       [0005]    However, nowadays high resolution reduces a region where the spacer is disposed in the display device, and the spacer contacts with a region that is not a seat because of misregistration during adhesion between the substrates, which results in a risk of occurrence of a display defect such as display unevenness. Particularly, in the case that the common wiring is formed along the gate line while superposed on the gate line, a laminated structure is raised in a region where the common wiring is formed, and the spacer contacts easily with the region. 
         [0006]    An object of the present disclosure is to provide a display device preventing the spacer from contacting with the region that is not the seat. 
         [0007]    To solve the above problem, a display device according to the present disclosure comprises: a first substrate; a second substrate facing the first substrate; and a plurality of spacers provided between the first substrate and the second substrate, wherein the first substrate includes: a plurality of seats which hold the plurality of spacers, respectively; a plurality of data lines extending in a column direction; a plurality of gate lines extending in a row direction; a plurality of thin film transistors each of which is formed near a respective intersection part of the plurality of data lines and the plurality of gate lines; a plurality of pixel electrodes corresponding to a plurality of pixel regions, respectively, the plurality of pixel regions being arrayed in the row and column directions; a common electrode that faces the plurality of pixel electrodes; and a plurality of common wirings that extend in the row direction and that are electrically connected to the common electrode, and each of the common wirings includes a bent part detouring around at least one of the plurality of seats. 
         [0008]    In the display device according to the present disclosure, the plurality of seats may include a first seat and a second seat having a surface area smaller than that of the first seat, and the bent part of at least one of the common wirings may be formed so as to detour around the first seat. 
         [0009]    In the display device according to the present disclosure, the plurality of spacers may include a first spacer and a second spacer having a level lower than that of the first spacer, the first spacer faces the first seat, and the second spacer faces the second seat. 
         [0010]    In the display device according to the present disclosure, at least a part of the bent part of at least one of the common wirings and at least one of the pixel electrodes may be superposed on each other in a laminated direction, and a region of the at least one common wiring not being the bent part and the at least one pixel electrode may not be superposed on each other in the laminated direction. 
         [0011]    In the display device according to the present disclosure, the first substrate may further include: a first insulator; a second insulator; an organic insulator, a third insulator, and a semiconductor layer, the first insulator covers the plurality of gate lines, the semiconductor layer is on the first insulator, each of the plurality of data lines is partially located on the semiconductor layer, the second insulator covers the plurality of data lines, the organic insulator is on the second insulator, the common electrode is on the second insulator, the common wiring is on the common electrode, the third insulator covers the common electrode and the common wiring, the plurality of pixel electrodes are on the third insulator, and at least one of the seats is in a superposition region where at least one of the gate lines, the semiconductor layer, at least one of the data lines, and the organic insulator overlap on one another in the laminated direction. 
         [0012]    In the display device according to the present disclosure, each of the common wirings may include a first common wiring extending in the row direction and a plurality of second common wirings extending in the column direction from the first common wiring, and at least one of the seats may be the second common wiring formed in the superposition region. 
         [0013]    In the display device according to the present disclosure, the first common wiring of at least one of the common wirings may include the bent part, and at least one of the plurality of second common wirings is connected to the bent part of the first common wiring. 
         [0014]    In the display device according to the present disclosure, at least one of the bent parts and the semiconductor layer may not overlap on each other in the laminated direction. 
         [0015]    In the display device according to the present disclosure, the first substrate may further include an organic insulator, the common electrode is on the organic insulator, the common wiring is on the common electrode, at least one of the pixel electrodes is connected to a source electrode constituting the thin film transistor through an opening formed in the organic insulator, and each of the common wirings is partially formed in the opening. 
         [0016]    In the display device of the present disclosure, the common wiring may be bent so as to detour around the seat, which prevents spacer from contacting with the region that is not seat. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1  is a plan view illustrating a schematic configuration of a liquid crystal display device according to an exemplary embodiment; 
           [0018]      FIG. 2  is a plan view illustrating a configuration of pixels; 
           [0019]      FIG. 3  is a cross-sectional view taken along a line A-A′ in  FIG. 2 ; 
           [0020]      FIG. 4  is a partly expansion view illustrating a TFT substrate according to an exemplary embodiment; 
           [0021]      FIG. 5  is a cross-sectional view taken along a line B-B′ in  FIG. 4 ; 
           [0022]      FIG. 6  is a cross-sectional view taken along a line C-C′ in  FIG. 4 ; and 
           [0023]      FIG. 7  is a cross-sectional view taken along a line D-D′ in  FIG. 4 . 
       
    
    
     DETAILED DESCRIPTION 
       [0024]    Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. In the exemplary embodiments, a liquid crystal display device is described as an example of display device. However the present disclosure is not limited to the liquid crystal display device. For example the present disclosure may be an organic electroluminescence display (OLED) device. 
         [0025]      FIG. 1  is a perspective view illustrating an entire configuration of a liquid crystal display device according to an exemplary embodiment. The liquid crystal display device includes display panel  10  that displays an image, a driving circuit (data line driving circuit, gate line driving circuit) that drives display panel  10 , a control circuit (not illustrated) that controls the driving circuit, and a backlight (not illustrated) that irradiates display panel  10  with light from a rear surface side. In display region  10   a  of display panel  10 , pixels  14  each of which is surrounded by two adjacent data lines  11  and two adjacent gate lines  12  are arrayed into a matrix shape in row and column directions. It is assumed that the column direction is a direction in which data line  11  extends, and that the row direction is a direction in which the gate line  12  extends. Spacer  210  (to be described later) is also illustrated in  FIG. 1 . 
         [0026]      FIG. 2  is a plan view illustrating a configuration of pixel  14 .  FIG. 3  is a sectional view taken on line A-A′ in  FIG. 2 . A specific configuration of display panel  10  will be described below with reference to  FIGS. 2 and 3 . 
         [0027]    In  FIG. 2 , a region sectioned by two adjacent data lines  11  and two adjacent gate lines  12  corresponds to one pixel  14 . Thin film transistor  13  is provided in each pixel  14 . Thin film transistor  13  is formed near an intersection part of data line  11  and gate line  12 . Thin film transistor  13  includes semiconductor layer  21  formed on first insulator  102 , and drain electrode  22  and source electrode  23 , which are formed on semiconductor layer  21  (see  FIG. 3 ). Drain electrode  22  is electrically connected to data line  11 , and source electrode  23  is electrically connected to pixel electrode  15  through contact hole  24 . 
         [0028]    Pixel electrode  15  including a transparent conductive film such as Indium Tin Oxide (ITO) is formed in each pixel  14 . Pixel electrode  15  includes a plurality of openings (slit), and is formed into a stripe shape. There is no limitation to a shape and a number of the opening. One common electrode  16  including the transparent conductive film such as ITO is formed in common to pixels  14  while facing pixel electrode  15 . An opening is formed to electrically connect pixel electrode  15  and source electrode  23  to each other in a region where common electrode  16  overlaps contact hole  24  and source electrode  23  of thin film transistor  13 . Each pixel  14  is covered with common electrode  16  except for the region where thin film transistor  13  is formed. A plurality of common wirings  116  are electrically connected to common electrode  16 . Each common wiring  116  extends in the row direction while being superposed on gate line  12 . 
         [0029]    As illustrated in  FIG. 3 , display panel  10  includes TFT substrate  100  (first substrate) disposed on the rear surface side, CF substrate  200  (second substrate) disposed on a display surface side, and liquid crystal layer  300  sandwiched between TFT substrate  100  and CF substrate  200 . 
         [0030]    In TFT substrate  100 , gate line  12  is formed on glass substrate  101 , and first insulator  102  is formed so as to cover gate line  12 . A step reflecting a planar shape or a thickness of gate line  12  is generated in a surface of first insulator  102 . Gate signal line  12  is formed by a metallic material mainly containing aluminum (Al), molybdenum (Mo), titanium (Ti), or copper (Cu), a plurality of laminated layers thereof, an alloy in which tungsten (w), manganese (Mn), or titanium (Ti) is added to the metallic material, or a laminated metallic layer of a combination thereof. First insulator  102  can be made of a known material. 
         [0031]    Semiconductor layer  21  is formed on first insulator  102 . Drain electrode  22  and source electrode  23  are formed on semiconductor layer  21 , and second insulator  103  is formed so as to cover drain electrode  22  and source electrode  23 . Organic insulator  104  is formed on second insulator  103 . A step reflecting planar shapes or thicknesses of semiconductor layer  21 , drain electrode  22 , and source electrode  23  is generated in the surface of second insulator  103 . A gently curved inclination influenced by the step generated in the surface of second insulator  103  occurs in the surface of organic insulator  104 . Second insulator  103  can be made of silicon nitride (SiN) or silicon dioxide (SiO 2 ). Organic insulator  104  is made of a photosensitive organic material mainly containing acryl. 
         [0032]    Common electrode  16  is formed on organic insulator  104 , and common wiring  116  is formed on common electrode  16 . The surface of common electrode  16  is formed while reflecting a surface shape of organic insulator  104 . The surface of common wiring  116  is formed while reflecting the surface shape of common electrode  16 . Common wiring  116  is made of a metallic material, and electrically connected to common electrode  16 . 
         [0033]    Third insulator  105  is formed so as to cover common electrode  16  and common wiring  116 . The surface of third insulator  105  is formed while reflecting the surface shapes or thicknesses of common electrode  16 , common wiring  116 , and organic insulator  104 . Third insulator  105  can be made of a known material. 
         [0034]    Pixel electrode  15  is formed on third insulator  105 , and alignment film  106  is formed so as to cover pixel electrode  15 . Pixel electrode  15  is electrically connected to source electrode  23  through contact hole  24  made in second insulator  103 , organic insulator  104 , and third insulator  105 . Alignment film  106  may be an alignment film subjected to a rubbing alignment process or a light alignment film subjected to a light alignment process. 
         [0035]    Although not illustrated, a polarizing plate and the like are formed on TFT substrate  100 . 
         [0036]    In CF substrate  200 , color filter  202  (for example, a red color filter, a green color filter, and a blue color filter) and black matrix  203  are formed on glass substrate  201 , and overcoat layer  204  is formed so as to cover color filter  202  and black matrix  203 . Black matrix  203  is made of a resin material in which black pigment is used or a metallic material. Overcoat layer  204  is made of an organic material. 
         [0037]    Alignment film  205  is formed on overcoat layer  204 . Alignment film  205  may be an alignment film subjected to the rubbing alignment process or a light alignment film subjected to the light alignment process. 
         [0038]    Although not illustrated, a polarizing plate and the like are formed on CF substrate  200 . 
         [0039]    Liquid crystal  301  is sealed in liquid crystal layer  300 . Liquid crystal  301  may be a negative liquid crystal having a negative dielectric anisotropy or a positive liquid crystal having a positive dielectric anisotropy. 
         [0040]    The laminated structure of each part constituting pixel  14  is not limited to the structure in  FIG. 3 , but a known structure can be applied. As described above, the liquid crystal display device has the IPS-system configuration. The configuration of the liquid crystal display device is not limited to the IPS-system configuration. 
         [0041]    A liquid crystal display device driving method will be briefly described below. A scanning gate voltage (gate-on voltage, gate-off voltage) is supplied to gate line  12  from the gate line driving circuit. A video data voltage is supplied to data line  11  from the data line driving circuit. When the gate-on voltage is supplied to gate line  12 , thin film transistor  13  is put into an on state, and the data voltage supplied to data line  11  is transmitted to pixel electrode  15  through drain electrode  22  and source electrode  23 . A common voltage (Vcom) is supplied to common electrode  16  from a common electrode driving circuit (not illustrated) through common wiring  116 . Therefore, liquid crystal  301  is driven by an electric field from pixel electrode  15  to common electrode  16  through liquid crystal layer  300  and the opening of pixel electrode  15 . Liquid crystal  301  is driven to control transmittance of light transmitted through liquid crystal layer  300 , thereby displaying the image. The liquid crystal display device driving method is not limited to the above method, and a known method can be applied. 
         [0042]    In the liquid crystal display device of the exemplary embodiment, a plurality of spacers  210  are disposed in order to hold a distance (gap) between TFT substrate  100  and CF substrate  200 . Seat  130  is formed in TFT substrate  100 , spacer  210  is formed in CF substrate  200 , and TFT substrate  100  and CF substrate  200  adhere to each other such that seat  130  and spacer  210  contact with each other, thereby holding the gap. 
         [0043]    Preferably spacer  210  is disposed at a position where a numerical aperture of the pixel is not degraded, for example, near thin film transistor  13 . For example, as illustrated in  FIG. 2 , spacer  210  (main spacer  210   a , sub-spacer  210   b ) is formed in CF substrate  200  so as to be disposed between thin film transistors  13  adjacent in the row direction in a plan view. A plurality of seats  130  are formed in TFT substrate  100 , and each seat  130  holds spacer  210  when TFT substrate  100  adheres to CF substrate  200 . Seat  130  is formed in the region facing spacer  210 . For example, seat  130  is formed in TFT substrate  100  so as to be disposed between thin film transistors  13  adjacent in the row direction in a plan view. Spacer  210  may include two kinds of spacers having different heights. Specifically, spacer  210  may include main spacer  210   a  contacting with seat  130  in a normal state and sub-spacer  210   b , which does not contact with seat  130  in the normal state, but contacts with seat  130  when display panel  10  is deformed. It is assumed that the number of sub-spacers  210   b  is lower than the number of main spacers  210   a . The provision of sub-spacer  210   b  can achieve improvement of a pressure resistance and suppression of bubble generation during low temperature. 
         [0044]    In the liquid crystal display device of the exemplary embodiment, the high resolution of the display panel reduces the region where seat  130  and spacer  210  are disposed, and spacer  210  contacts with the region that is not seat  130  because of the misregistration during the adhesion between TFT substrate  100  and CF substrate  200 , which results in a risk of the occurrence of the display defect such as display unevenness. Particularly, because the laminated structure is raised in the region where common wiring  116  is formed, spacer  210  contacts easily to the region. In the configuration of the liquid crystal display device of the exemplary embodiment, common wiring  116  extending in the row direction is bent so as to detour around seat  130 , which prevents spacer  210  from contacting with the region that is not seat  130  even if the misalignment occurs during the adhesion between TFT substrate  100  and CF substrate  200 . 
         [0045]    A specific configuration of common wiring  116  will be described below with reference to  FIGS. 4 to 6 .  FIG. 4  is a partially enlarged view of TFT substrate  100 .  FIG. 4  illustrates a neighborhood of two thin film transistors  13  (thin film transistor  13   a  and thin film transistor  13   b ) adjacent in the row direction in display panel  10  of  FIG. 2 .  FIG. 5  is a sectional view taken on line B-B′ in  FIG. 4 .  FIG. 5  is the sectional view taken on line B-B′ while CF substrate  200  in which spacer  210  is formed adheres to TFT substrate  100  in  FIG. 4 .  FIG. 6  is a sectional view taken on line C-C′ in  FIG. 4 .  FIG. 6  is the sectional view taken on line C-C′ while CF substrate  200  in which spacer  210  is formed adheres to TFT substrate  100  in  FIG. 4 . The configuration on the side of TFT substrate  100  in  FIGS. 4 to 6  is described above with reference to  FIG. 3  except that the configuration on the side of TFT substrate  100  includes data line  11 , common wiring  116  (first common wiring  116   a  and second common wiring  116   b ), superposition region  120 , and seat  130 . The configuration on the side of CF substrate  200  in  FIGS. 5 and 6  is described above with reference to  FIG. 3  except that the configuration on the side of CF substrate  200  includes spacer  210 . Accordingly, the overlapping description is omitted. 
         [0046]    The laminated structure in the region between two thin film transistors  13  adjacent in the row direction will be described below. In the region between two adjacent thin film transistors  13  adjacent in the row direction in TFT substrate  100 , data line  11  is formed on semiconductor layer  21 , second insulator  103  is formed so as to cover data line  11 , and organic insulator  104  is formed on second insulator  103 . The step reflecting the planar shapes or thicknesses of gate line  12 , first insulator  102 , and semiconductor layer  21  is generated in the surface of data line  11 . The step reflecting the planar shapes or thicknesses of semiconductor layer  21  and data line  11  is generated in the surface of second insulator  103 . The gently curved inclination influenced by the step generated in second insulator  103  occurs in the surface of organic insulator  104 . Common electrode  16  is formed on organic insulator  104 , and common wiring  116  is formed on common electrode  16 . Common wiring  116  is formed while reflecting the surface shape of common electrode  16 . Common wiring  116  includes first common wiring  116   a  that extends in the row direction between pixels  14  adjacent in the column direction and a plurality of second common wirings  116   b  that extend in the column direction from first common wiring  116   a  in the region between two thin film transistors  13  adjacent in the row direction. Third insulator  105  is formed so as to cover common electrode  16  and common wiring  116 . The surface of third insulator  105  is formed while reflecting the surface shapes or thicknesses of organic insulator  104 , common electrode  16 , and common wiring  116 . 
         [0047]    Seat  130  is the region facing spacer  210 . For example, seat  130  is formed in the region between two thin film transistors  13  adjacent in the row direction. As illustrated in  FIG. 4 , seat  130  includes first seat  130   a  holding main spacer  210   a  and second seat  130   b  holding sub-spacer  210   b . Spacer  210  of the exemplary embodiment includes main spacer  210   a  and sub-spacer  210   b , which differ from each other. Hereinafter, main spacer  210   a  and sub-spacer  210   b  are simply referred to as spacer  210  in describing the configuration common to main spacer  210   a  and sub-spacer  210   b . Similarly, first seat  130   a  and second seat  130   b  are simply referred to as seat  130  in describing the configuration common to first seat  130   a  and second seat  130   b.    
         [0048]    A specific configuration of seat  130  will be described below. Seat  130  is formed in superposition region  120  where at least gate line  12 , semiconductor layer  21 , data line  11 , and organic insulator  104  are superposed on one another in the laminated direction. Superposition region  120  is a region facing spacer  210 . Specifically, seat  130  is superposition region  120  where gate line  12 , semiconductor layer  21 , data line  11 , and organic insulator  104  are superposed on one another in the laminated direction, and is a step formed above organic insulator  104 . Seat  130  is formed such that a whole outer periphery of seat  130  and superposition region  120  are superposed in the laminated direction. As described above, sometimes the gently curved inclination occurs in organic insulator  104  of TFT substrate  100  by the influence of the step of the underlying layer. Preferably seat  130  is not formed in the region where the inclination occurs. At this point, because superposition region  120  where gate line  12 , semiconductor layer  21 , data line  11 , and organic insulator  104  are superposed on one another in the laminated direction has flatness, whole seat  130  is formed in superposition region  120 . In the exemplary embodiment, common wiring  116  that is formed above organic insulator  104  in superposition region  120  is used as seat  130 . Specifically, second common wiring  116   b  that is formed above organic insulator  104  in superposition region  120  is used as seat  130 . Alternatively, both second common wiring  116   b  formed in superposition region  120  and third insulator  105  formed above second common wiring  116   b  may be used as seat  130 . In superposition region  120 , the region where gate line  12 , semiconductor layer  21 , data line  11 , organic insulator  104 , common electrode  16 , and common wiring  116  in TFT substrate  100  are superposed on one another in the laminated direction may be defined as seat  130 . Specifically, the region where gate line  12 , semiconductor layer  21 , data line  11 , organic insulator  104 , common electrode  16 , and second common wiring  116   b  in TFT substrate  100  are superposed on one another in the laminated direction may be defined as seat  130 . 
         [0049]    Because second seat  130   b  does not contact with sub-spacer  210   b  in the normal state, a surface area of second seat  130   b  is formed smaller than first seat  130   a . That is, a width in the column direction of second common wiring  116   b  in second seat  130   b  is narrower than that in the column direction of second common wiring  116   b  in first seat  130   a . First seat  130   a  is equal to second seat  130   b  in a width in the row direction of second common wiring  116   b . A width in the column direction of gate line  12  in the region where second seat  130   b  is formed may be narrower than column direction of gate line  12  in the region where first seat  130   a  is formed. A width in the column direction of semiconductor layer  21  in the region where second seat  130   b  is formed may be narrower than column direction of semiconductor layer  21  in the region where first seat  130   a  is formed. 
         [0050]    In CF substrate  200 , spacer  210  is formed on overcoat layer  204 , and alignment film  205  is formed so as to cover spacer  210 . Spacer  210  is formed in CF substrate  200  so as to overlap black matrix  203  in a plan view. As illustrated in  FIG. 5 , main spacer  210   a  is formed in CF substrate  200  such that at least a part of the surface on the side of TFT substrate  100  of main spacer  210   a  contacts with the surface of first seat  130   a . As illustrated in  FIG. 6 , sub-spacer  210   b  is formed in CF substrate  200  so as not to contact with the surface of second seat  130   b  in the normal state. Spacer  210  and seat  130  may be provided in a ratio of one or a plurality of spacers  210  and seats  130  to one pixel set including a red pixel, a blue pixel, and a green pixel, or spacer  210  and seat  130  may be provided in a ratio of one to the plurality of pixel sets. Spacer  210  can be formed into a columnar shape, a prism shape, a conical shape, or the like. 
         [0051]    Common wiring  116  includes bent part  126  that detours around at least one of the plurality of seats  130 . In the exemplary embodiment, first common wiring  116   a  includes bent part  126 , and second common wiring  116   b  constituting first seat  130   a  is connected to bent part  126 . 
         [0052]    As illustrated in  FIGS. 4 and 5 , first common wiring  116   a  extends linearly in the row direction between pixels  14  adjacent in the column direction, and bent part  126  of first common wiring  116   a  is formed so as to detour around first seat  130   a . That is, first common wiring  116   a  is bent in the column direction so as to separate from first seat  130   a  in bent part  126 . First common wiring  116   a  may be bent in the column direction so as to separate from superposition region  120  in bent part  126 . First common wiring  116   a  may be bent in the column direction such that bent part  126  and semiconductor layer  21  are not superposed on each other in the laminated direction in bent part  126 . First common wiring  116   a  may be bent in the column direction such that a part of bent part  126  and gate line  12  are not superposed on each other in the laminated direction in bent part  126 . 
         [0053]    At this point, first common wiring  116   a  does not detour around second seat  130   b  that does not contact with sub-spacer  210   b  in the normal state, but detours around first seat  130   a  that contacts with main spacer  210   a  in the normal state. Accordingly, first common wiring  116   a  may be superposed on superposition region  120 , semiconductor layer  21 , gate line  12 , and in the laminated direction in the region where second seat  130   b  is formed. Specifically, as illustrated in  FIGS. 4 and 6 , first common wiring  116   a  and second seat  130   b  are formed so as to contact with each other in a plan view. First common wiring  116   a  and gate line  12  are superposed on each other in the laminated direction in the region where second seat  130   b  is formed. A part of first common wiring  116   a  and semiconductor layer  21  are superposed on each other in the laminated direction in the region where second seat  130   b  is formed. 
         [0054]    Bent part  126  and first seat  130   a  separate from each other in the column direction, which allows main spacer  210   a  to be prevented from contacting with the region where first common wiring  116   a  is formed. 
         [0055]    At least a part of bent part  126  and pixel electrode  15  are superposed on each other in the laminated direction, and the region that is not bent part  126  in first common wiring  116   a  and pixel electrode  15  are not superposed on each other in the laminated direction. Therefore, the degradation of the numerical aperture can be suppressed in the pixel region while main spacer  210   a  is prevented from contacting with the region where first common wiring  116   a  is formed. 
         [0056]    As illustrated in  FIG. 4 , opening  104   a  is formed to electrically connect pixel electrode  15  and source electrode  23  to each other in the region where organic insulator  104  overlaps contact hole  24  and source electrode  23  of thin film transistor  13 .  FIG. 7  is a sectional view taken on line D-D′ in  FIG. 4 . Preferably a part of the common wiring is formed near the position of organic insulator  104  in the region where thin film transistor  13  is formed. Specifically, as illustrated in  FIG. 4 , first common wiring  116   a  is formed such that first common wiring  116   a  and opening  104   a  partially overlap each other in the region where gate line  12 , semiconductor layer  21 , and drain electrode  22  are superposed on one another in a plan view. That is, a part of first common wiring  116   a  is formed in opening  104   a  of organic insulator  104 . As illustrated in  FIG. 7 , parts of common electrode  16  and first common wiring  116   a  are formed in opening  104   a  of organic insulator  104 . The step is generated in opening  104   a  of organic insulator  104  by common electrode  16  and first common wiring  116   a , which are formed in opening  104   a  of organic insulator  104 . The step facilitates entry of alignment film  106  into contact hole  24  to improve an application spread of alignment film  106 . 
         [0057]    Common wiring  116  is not limited to the above configuration. For example, first common wiring  116   a  and second common wiring  116   b  may be formed while separating from each other. That is, first common wiring  116   a  extending in the row direction between pixels  14  adjacent in the column direction and second common wiring  116   b  extending in the column direction between pixels  14  adjacent in the row direction may be separately formed. Second common wiring  116   b  may be formed into an island shape in the region between two thin film transistors  13  adjacent in the row direction. That is, second common wiring  116   b  may be made of the same material (for example, a metallic layer) as first common wiring  116   a  in the same layer as first common wiring  116   a  while separating from first common wiring  116   a . In this case, second common wiring  116   b  may be formed such that whole second common wiring  116   b  is included in superposition region  120 . 
         [0058]    Seat  130  is not limited to the configuration of second common wiring  116   b . For example, seat  130  may be a resin layer, which is made of a resin material and formed in superposition region  120  where gate line  12 , semiconductor layer  21 , data line  11 , and organic insulator  104  in TFT substrate  100  are superposed on one another in the laminated direction. The resin layer may be formed on common electrode  16  in the same layer as common wiring  116 , or formed on third insulator  105 . In the case that the resin layer is formed on third insulator  105 , the surface of the resin layer contacts with spacer  210 . Thus, in the liquid crystal display device of the exemplary embodiment, the layer (such as a second common wiring  116   b , a resin layer, and a metallic layer) formed in superposition region  120  where gate line  12 , semiconductor layer  21 , data line  11 , and organic insulator  104  are superposed on one another in the laminated direction can be defined as seat  130 . 
         [0059]    First common wiring  116   a  in  FIG. 4  is formed so as not to detour around second seat  130   b  that does not contact with sub-spacer  210   b  in the normal state. Alternatively, first common wiring  116   a  may be formed so as to detour around second seat  130   b . Therefore, when display panel  10  is deformed, sub-spacer  210   b  can be prevented from contacting with the region where first common wiring  116   a  is formed. 
         [0060]    In the above, the specific embodiments of the present application have been described, but the present application is not limited to the above-mentioned embodiments, and various modifications may be made as appropriate without departing from the spirit of the present application.

Technology Classification (CPC): 6