Patent Publication Number: US-2015077686-A1

Title: Substrate for electro-optical device, electro-optical device, and electronic apparatus

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to a substrate for an electro-optical device including a color filter, an electro-optical device, and an electronic apparatus. 
     2. Related Art 
     As the electro-optical device described above, for example, a liquid crystal device in an active drive method which includes a transistor as an element of performing a switching control on a pixel electrode for each pixel has been known. The liquid crystal device is used in, for example, a direct view display, a light bulb, or the like. 
     For example, in JP-A-2009-48063, a stack structure in which a color filter (coloring layer) is made in the same substrate (a substrate for an electro-optical device or an element substrate) in which a pixel electrode or a switching element is made, a so-called on-chip color filter structure (COA structure), is disclosed. 
     According to the structure, since the color filter, the pixel electrode, or the like is made in the same substrate, it is possible to suppress a deviation between a pixel region and a color filter region (a set deviation is caused) such as when separately making the element substrate and the color filter substrate. 
     However, in an on-chip color filter structure, if there is a gap between a color filter and a wiring (source line, capacity line or the like) adjacent to a color filter region, light leakage occurs from the gap in some cases. Accordingly, there is a problem that a display quality is lowered due to color mixture and the like caused by a difference in a refractive index of the color filter region and the like. 
     SUMMARY 
     The invention can be realized in the following forms or application examples. 
     APPLICATION EXAMPLE 1 
     According to this application example, there is provided a substrate for an electro-optical device, including, a base, a first insulation layer provided above the base, the first insulation layer has a concave portion, a plurality of first wirings provided above the first insulation layer so as to interpose the concave portion, a protective film provided so as to cover the plurality of the first wirings, a color filter provided in the concave portion, a second insulation layer provided above the color filter and the plurality of first wirings, and a pixel electrode provided above the second insulation layer. 
     In this case, since the first wirings with a light shielding property are provided so as to interpose a color filter in a plan view, for example, light passing through a pixel can be prevented from being incident on a color filter of an adjacent pixel. Accordingly, color mixture or light leakage can be prevented, thereby improving a display quality. In addition, since a protective film is provided between the first wiring and the color filter, the first wirings can be prevented from being corroded by contact between the first wirings and the color filters. 
     APPLICATION EXAMPLE 2 
     In the substrate for an electro-optical device according to the application example, it is preferable that each of the plurality of first wirings not be electrically connected to wirings. 
     In this case, since the first wirings enter a floating state, for example, even if the protective film is not reliably formed in the first wirings, a metallic material included in the color filter can be suppressed so as not to affect a function of the first wirings as a wiring. 
     APPLICATION EXAMPLE 3 
     In the substrate for an electro-optical device according to the application example, it is preferable that the protective film be provided over an inner surface of the concave portion from one of the plurality of the first wirings. 
     In this case, since the protective film is provided over the inner surface of the concave portion from the first wiring, the first wiring and the color filter can be reliably separated from each other and it is possible to prevent the first wiring from being corroded. 
     APPLICATION EXAMPLE 4 
     According to this application example, there is provided an electro-optical device, including the substrate for an electro-optical device described above, an opposite substrate disposed to face the substrate for an electro-optical device, and an electro-optical layer disposed between the substrate for an electro-optical device and the opposite substrate. 
     In this case, since the electro-optical device includes the substrate for an electro-optical device, light incident through the electro-optical layer can be prevented from being color-mixed or from leaking, thereby improving a display quality. 
     APPLICATION EXAMPLE 5 
     According to this application example, there is provided an electronic apparatus, including the electro-optical device described above. 
     In this case, since the electronic apparatus includes the electro-optical device described above, it is possible to provide an electronic apparatus which can improve a display quality. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a schematic plan view which shows a configuration of a liquid crystal device. 
         FIG. 2  is a schematic cross-sectional view taken along line II-II of the liquid crystal device shown in  FIG. 1 . 
         FIG. 3  is an equivalent circuit diagram which shows an electrical configuration of the liquid crystal device. 
         FIG. 4  is a schematic cross-sectional view which mainly shows a structure of a pixel of a liquid crystal device. 
         FIG. 5  is a schematic plan view which shows in detail a structure of an element substrate as a substrate for an electro-optical device. 
         FIGS. 6A and 6B  are schematic cross-sectional views taken along line A-A′ and line B-B′ of the element substrate shown in  FIG. 5 . 
         FIG. 7  is a flowchart which shows a method of manufacturing a liquid crystal device in a process order. 
         FIGS. 8A to 8C  are schematic cross-sectional views which show a portion of the method of manufacturing a liquid crystal device. 
         FIGS. 9A to 9C  are schematic cross-sectional views which show a portion of the method of manufacturing a liquid crystal device. 
         FIGS. 10A to 10C  are schematic cross-sectional views which show a portion of the method of manufacturing a liquid crystal device. 
         FIG. 11  is a schematic diagram which shows a configuration of a projection type display device including the liquid crystal device. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, embodiments which embody the invention will be described referring to drawings. Drawings to be used are displayed to be appropriately enlarged or reduced so that a portion to be described becomes recognizable. 
     For example, “on a substrate” described in following embodiments indicates a case of being disposed to be in contact with a substrate, a case of being disposed through another structure on a substrate, or a case of partially being disposed so as to be in contact on a substrate and of partially being disposed through another structure. 
     In the embodiment, as an example of the electro-optical device, an active matrix type liquid crystal device which includes a thin film transistor (TFT) as a switching element of a pixel is described as an example. The liquid crystal device can be appropriately used as, for example, a light modulation element (liquid crystal light valve) of a projection type display device (liquid crystal projector). Configuration of Liquid Crystal Device as Electro-optical Device 
       FIG. 1  is a schematic plan view which shows a configuration of a liquid crystal device.  FIG. 2  is a schematic cross-sectional view taken along line II-II of the liquid crystal device shown in  FIG. 1 .  FIG. 3  is an equivalent circuit diagram which shows an electrical configuration of the liquid crystal device. Hereinafter, a configuration of the liquid crystal device will be described referring to  FIGS. 1 to 3 . 
     As shown in  FIGS. 1 and 2 , a liquid crystal device  100  of the embodiment includes an element substrate  10  and an opposite substrate  20  which are disposed to face each other, and a liquid crystal layer  15  as an electro-optical layer which is interposed by a pair of these substrates. A transparent substrate such as a glass substrate or a quartz substrate is used for a base material  10   a  configuring the element substrate  10  and a base material  20   a  configuring the opposite substrate  20 . 
     The element substrate  10  is larger than the opposite substrate  20 , and both substrates are bonded via a sealing material  14  disposed along an outer periphery of the opposite substrate  20 . A liquid crystal which has a positive or a negative dielectric anisotropy is enclosed in the gap to configure the liquid crystal layer  15 . 
     As the sealing material  14 , an adhesive such as thermosetting or UV-curable epoxy resin and the like is adopted. Spacers (glass beads) for constantly maintaining a gap between a pair of the substrates are mixed in the sealing material  14 . The glass beads are used to maintain a cell gap. 
     Inside the sealing material  14 , a display region E in which a plurality of pixels P contributing to a display are arranged is provided. A dummy pixel region (not shown) which does not contribute to a display is provided in a periphery of the display region E. Moreover, although not illustrated in  FIGS. 1 and 2 , a light-shielding portion (black matrix: BM) which respectively partitions a plurality of pixels P in a planar manner in the display region E is provided in the opposite substrate  20 . 
     A data line driving circuit  22  is provided between the sealing material  14  along one side of the element substrate  10  and the one side. In addition, an inspection circuit  25  is provided between the sealing material  14  along the other side facing the one side and the display region E. Furthermore, a scanning line driving circuit  24  is provided between the sealing material  14  along the other two sides which are orthogonal to the one side and face each other and the display region E. A plurality of wirings  29  which connect two scanning line driving circuits  24  are provided between the sealing material  14  along the other side which faces the one side and the inspection circuit  25 . 
     Inside the sealing material  14  disposed in a frame shape at the opposite substrate  20  side, the light-shielding film  18  (side portion) in the same frame shape is provided. The light-shielding film  18  is made of, for example, a metal, a metal oxide, or the like with a light shielding property, and configures a display region E having a plurality of pixels P inside the light-shielding film  18 . Although not illustrated in  FIG. 1 , the light-shielding film which partitions the plurality of pixels P in the display region E in a planar manner is provided. 
     A wiring leading to the data line driving circuit  22  and the scanning line driving circuit  24  is connected to a plurality of external connection terminals  71  arranged along the one side. Thereafter, description is provided by setting a direction along the one side to be an X direction, and setting a direction along other two sides which are orthogonal to the one side and face each other to be a Y direction. 
     As shown in  FIG. 2 , a light-permeable pixel electrode  27  and a thin film transistor (TFT: hereinafter, referred to as “TFT  30 ”) which is a switching element, that are provided for each pixel P, a signal wiring, and an alignment film  28  covering these are formed at a surface of the liquid crystal layer  15  side of the base material  10   a.    
     In addition, a light-shielding structure which prevents a switching operation from being unstable by allowing light to be incident on a semiconductor layer in the TFT  30  is adopted. The element substrate  10  in the invention includes at least a pixel electrode  27 , a TFT  30 , a signal wiring, and an alignment film  28 . 
     At a surface of the liquid crystal layer  15  side of the opposite substrate  20 , the light-shielding film  18 , an insulation layer  33  which is formed so as to cover the light-shielding film, an opposite electrode  31  which is provided so as to cover the insulation layer  33 , and an alignment film  32  which covers the opposite electrode  31  are provided. The opposite substrate  20  in the invention includes at least the light-shielding film  18 , the opposite electrode  31 , and the alignment film  32 . 
     As shown in  FIG. 1 , the light-shielding film  18  surrounds the display region E, and is provided at positions overlapping scanning line driving circuit  24  and an inspection circuit  25  in a plan view. Thus, by blocking light incident on a peripheral circuit including these driving circuits from the opposite substrate  20  side, the peripheral circuit is prevented from malfunctioning due to the light. Moreover, unnecessary stray light is blocked so as not to be incident on a display region E, and thereby a high contrast in a display of the display region E is ensured. 
     The insulation layer  33  is made of an inorganic material such as silicon oxide and the like, and has an optical transparency to be provided so as to cover the light-shielding film  18 . As a method of forming such an insulation layer  33 , methods of deposition such as a plasma Chemical Vapor Deposition (CVD) method and the like are exemplified. 
     The opposite electrode  31  which is made of a transparent conductive film such as Indium Tin Oxide (ITO) and the like covers the insulation layer  33 , and is electrically connected to a wiring of the element substrate  10  side by a vertical conductor  26  provided at four corners of the opposite substrate  20  as shown in  FIG. 1 . 
     The alignment film  28  covering the pixel electrode  27  and the alignment film  32  covering the opposite electrode  31  are selected based on an optical design of the liquid crystal device  100 . As the alignment films  28  and  32 , an inorganic alignment film which is substantially vertically aligned with respect to a liquid crystal molecule having a negative dielectric anisotropy by depositing an inorganic material such as SiOx (silicon oxide) and the like using a vapor deposition method is exemplified. 
     The liquid crystal device  100  is, for example, a permeable type, and adopts an optical design of a normally white mode in which transmittance of a pixel P when a voltage is not applied is greater than transmittance when a voltage is applied, or a normally black mode in which transmittance of a pixel P when a voltage is not applied is less than transmittance when a voltage is applied. A polarizing element is disposed and used at an incident side and an emission side of light, respectively, according to the optical design. 
     As shown in  FIG. 3 , the liquid crystal device  100  includes at least a plurality of scanning lines  3   a  and a plurality of data lines  6   a  which are insulated and orthogonal to each other in the display region E, and a capacity line  3   b . A direction in which the scanning line  3   a  extends is an X direction, and a direction in which the data line  6   a  extends is a Y direction. 
     The pixel electrode  27 , the TFT  30 , and the capacitor  16  are provided in a region partitioned by signal lines such as the scanning line  3   a , the data line  6   a , and the capacity line  3   b , and these configure a pixel circuit of the pixel P. 
     The scanning line  3   a  is electrically connected to a gate of the TFT  30 , and the data line  6   a  is electrically connected to a source/drain region at a data line side (source region) of the TFT  30 . The pixel electrode  27  is electrically connected to a source/drain region at a pixel electrode side (drain region) of the TFT  30 . 
     The data line  6   a  is connected to the data line driving circuit  22  (refer to  FIG. 1 ) and supplies pixel signals D 1 , D 2 , . . . , Dn supplied from the data line driving circuit  22  to a pixel P. The scanning line  3   a  is connected to the scanning line driving circuit  24  (refer to  FIG. 1 ), and supplies scanning signals SC 1 , SC 2 , . . . , SCm supplied from the scanning line driving circuit  24  to each pixel P. 
     The image signal D 1  to Dn supplied from the data line driving circuit  22  to the data line  6   a  may be supplied line-sequentially in this order, and may be supplied to each group among a plurality of data lines  6   a  which are adjacent to each other. The scanning line driving circuit  24  line-sequentially supplies scanning signals SC 1  to SCm to the scanning line  3   a  in a pulse manner at a predetermined timing. 
     The liquid crystal device  100  is made to have a configuration in which the TFT  30  that is a switching element is assumed to be in an on state only for a fixed period of time by an input of scanning signals SC 1  to SCm, and thereby image signals D 1  to Dn supplied from the data line  6   a  are written in the pixel electrode  27  at a predetermined timing. Then, the image signals D 1  to Dn at a predetermined level written in the liquid crystal layer  15  through the pixel electrode  27  are maintained between the pixel electrode  27  and the opposite electrode  31  which is disposed to face the pixel electrode  27  through the liquid crystal layer  15  for a fixed period of time. 
     In order to prevent the maintained image signals D 1  to Dn from leaking, the capacitor  16  is connected in parallel to a liquid crystal capacitor formed between the pixel electrode  27  and the opposite electrode  31 . The capacitor  16  is provided between the source/drain region at a pixel electrode side of the TFT  30  and the capacity line  3   b . The capacitor  16  has a dielectric layer between two capacitor electrodes. 
     Configuration of Pixel Configuring Liquid Crystal Device 
       FIG. 4  is a schematic cross-sectional view which mainly shows a structure of a pixel of the liquid crystal device. Hereinafter, the structure of a pixel of the liquid crystal device will be described referring to  FIG. 4 .  FIG. 4  shows a cross-sectional positional relationship of each configuration element, and is represented by an explicit scale. 
     As shown in  FIG. 4 , the liquid crystal device  100  includes the element substrate  10  as a substrate for an electro-optical device, and an opposite substrate  20  which is disposed to face the element substrate  10 . A base material  10   a  configuring the element substrate  10 , and a base material  20   a  configuring the opposite substrate  20  are configured to have, for example, a quartz substrate, and the like. 
     As shown in  FIG. 4 , a lower light-shielding film  3   c  including materials such as aluminum (Al), titanium (Ti), chromium (Cr), tungsten (W), and the like is formed on the base material  10   a . The lower light-shielding film  3   c  is patterned in a lattice shape in a plan view, and stipulates an opening region of each pixel P. The lower light-shielding film  3   c  has conductivity and may be made to function as a portion of the scanning line  3   a . An underlying insulation layer  11   a  made of silicon oxide and the like is formed on the base material  10   a  and the lower light-shielding film  3   c.    
     The TFT  30 , the scanning line  3   a  and the like are formed on the underlying insulation layer  11   a . The TFT  30  has, for example, a Lightly Doped Drain (LDD) structure, and includes the semiconductor layer  30   a  made of poly-silicon (highly pure polycrystalline silicon) and the like, a gate insulation layer  11   g  formed on the semiconductor layer  30   a , and a gate electrode  30   g  which is formed on the gate insulation layer  11   g  and is made of poly silicon film and the like. The scanning line  3   a  functions as the gate electrode  30   g.    
     N-type impurity ions such as phosphorus (P) ions and the like are injected, and thereby the semiconductor layer  30   a  is formed as an N-type TFT  30 . Specifically, the semiconductor layer  30   a  includes a channel region  30   c , an LDD region at a data line side  30   s   1 , a source/drain region at a data line side  30   s , an LDD region at a pixel electrode side  30   d   1 , and a source/drain region at a pixel electrode side  30   d.    
     The channel region  30   c  is doped with p-type impurity ions such as boron (B) ions and the like. The other regions  30   s   1 ,  30   s ,  30   d   1 , and  30   d  are doped with n-type impurity ions such as phosphorus (P) ions and the like. In this manner, the TFT  30  is formed as the N-type TFT. 
     A first interlayer insulation layer  11   b  made of silicon oxide and the like is formed on the gate electrode  30   g  and the gate insulation layer  11   g . The capacitor  16  is provided on the first interlayer insulation layer  11   b . Specifically, a first capacitor electrode  16   a  as a pixel potential capacitor electrode electrically connected to the source/drain region at a pixel electrode side  30   d  of the TFT  30  and the pixel electrode  27 , and a portion of the second capacitor electrode  16   b  (capacity line  3   b ) as a fixed potential capacitor electrode are disposed to face each other via the dielectric film  16   c , and thereby the capacitor  16  is formed. 
     The dielectric film  16   c  is, for example, a silicon nitride film. The second capacitor electrode  16   b  (capacity line  3   b ) is made of a single metal, an alloy, a metal silicide, a poly silicide, a stack of these, or the like which includes at least one of high melting point metals such as titanium (Ti), chromium (Cr), tungsten (W), tantalum (Ta), molybdenum (Mo), and the like. Alternatively, the second capacitor electrode  16   b  can be formed of an aluminum (Al) film. 
     The first capacitor electrode  16   a  is made of, for example, a conductive polysilicon film, and functions as a pixel potential capacitor electrode of the capacitor  16 . However, the first capacitor electrode  16   a , in the same manner as the capacity line  3   b , may be configured from a single layer film or a multilayer film including a metal or an alloy. The first capacitor electrode  16   a , in addition to a function as the pixel potential capacitor electrode, has a function of relay connecting of the pixel electrode  27  and the source/drain region at a pixel electrode side  30   d  (drain region) of the TFT  30  via contact holes CNT 1 , CNT 2 , CNT 3 , and CNT 4 . 
     The data line  6   a  is formed on the capacitor  16  via a second interlayer insulation layer  11   c  which is one of the first insulation layers. The data line  6   a  is electrically connected to the source/drain region at a data line side  30   s  (source region) of the semiconductor layer  30   a  via a contact hole CNT 5  that is opened in the gate insulation layer  11   g , the first interlayer insulation layer  11   b , the dielectric film  16   c , and the second interlayer insulation layer  11   c.    
     A third interlayer insulation layer  11   d  which is one of the first insulation layers is provided on the data line  6   a . The first wiring  51  and the second wiring  52  are provided on the third interlayer insulation layer  11   d . A second oxide film  62  as a second insulation layer is provided on the first wiring  51 , the second wiring  52 , and the third interlayer insulation layer  11   d  via the protective film  53 . 
     The pixel electrode  27  is provided on the second oxide film  62 . The pixel electrode  27  is electrically connected to the second wiring  52  via a contact hole CNT 4  formed on the second oxide film  62 . 
     A color filter  80  is provided in the display region E in the second interlayer insulation layer  11   c , the third interlayer insulation layer  11   d , and a portion of the second oxide film  62 . A structure of a periphery of the color filter  80  will be described below in detail. In addition, a planarization process such as Chemical Mechanical Polishing (CMP) and the like is performed on the third interlayer insulation layer  11   d  and a surface of the second oxide film  62 . 
     The pixel electrode  27  is connected to a contact hole CNT 1  via the contact hole CNT 4 , the second wiring  52 , a contact hole CNT 3 , a replay layer  41 , a contact hole CNT 2 , and a first capacitor electrode  16   a . Accordingly, the pixel electrode  27  is electrically connected to the source/drain region at a pixel electrode side  30   d  (drain region) of the semiconductor layer  30   a . The pixel electrode  27  is formed of a transparent conductive film such as an Indium Tin Oxide (ITO) film and the like. 
     The alignment film  28  on which inorganic materials such as silicon oxide (Si 02 ) and the like are obliquely formed is provided on the pixel electrode  27  and the second oxide film  62 . The liquid crystal layer  15  in which a liquid crystal and the like are enclosed in a space surrounded by the sealing material  14  (refer to  FIGS. 1 and 2 ) is provided on the alignment film  28 . 
     Meanwhile, an insulation layer (not shown) made of, for example, a PSG film (silicon oxide doped with phosphorus) and the like is provided on the base material  20   a  (liquid crystal layer  15  side). The opposite electrode  31  is provided across an entire surface on the insulation layer. The alignment film  32  on which inorganic materials such as silicon oxide (SiO 2 ) and the like are obliquely formed is provided on the opposite electrode  31 . The opposite electrode  31  is made of a transparent conductive film such as an ITO film and the like in the same manner as the pixel electrode  27  described above. 
     The liquid crystal layer  15  takes a predetermined alignment state by the alignment films  28  and  32  with no electric field generated between the pixel electrode  27  and the opposite electrode  31 . The sealing material  14  is an adhesive made of, for example, a light-curable resin or a thermosetting resin to bond the element substrate  10  and the opposite substrate  20 , and a glass fiber or a spacer such as glass beads and the like for setting a distance between the element substrate  10  and the opposite substrate  20  to a predetermined value are mixed therein. 
     Structure of Element Substrate as Substrate for Electro-optical Device 
       FIG. 5  is a schematic plan view which shows in detail a structure of an element substrate as a substrate for an electro-optical device in the liquid crystal device.  FIGS. 6A and 6B  are schematic cross-sectional views taken along line A-A′ and B-B′ of the element substrate shown in  FIG. 5 . Hereinafter, a structure of the element substrate will be described referring to  FIGS. 5 to 6B . 
     As shown in  FIG. 5 , in the element substrate  10 , the color filter  80 , the first wiring  51  disposed between adjacent color filters  80  in an X direction, and the second wiring  52  disposed in a vicinity of the color filter  80  in a Y direction are provided in a region configuring a pixel P. 
     In addition, as shown in  FIGS. 6A and 6B , the element substrate  10  has the first wiring  51  and the second wiring  52  provided on the base material  10   a  via the underlying insulation layer  11   a  to a third interlayer insulation layer  11   d . As described above, the TFT  30  or the data line  6   a , a capacitor  16 , and the like are provided in the underlying insulation layer  11   a  to the third interlayer insulation layer  11   d.    
     The first wiring  51  and the second wiring  52  are made to have a structure in which titanium nitride  50   b  is stacked on aluminum  50   a . In the embodiment, the first wiring  51  is used as a light-shielding film for suppressing a color mixture of the adjacent color filters  80 . Moreover, the first wiring  51  is not electrically connected to other wirings and the like, but is disposed in a floating state. The second wiring  52  is used as a relay electrode for electrically connecting the source/drain region at a pixel electrode side  30   d  and the pixel electrode  27 . 
     The color filter  80 , as shown in  FIG. 6A , is provided in the second interlayer insulation layer  11   c  to the second oxide film  62  between the adjacent first wirings  51 . The protective film  53  to prevent the first wiring  51  configured to include the aluminum  50   a  from being corroded by contact with the color filter  80  is provided between the color filters  80  and the first wirings  51 . That is, the color filters  80  and the first wirings  51  are not in direct contact with each other. 
     The protective film  53  is, for example, a BSG film (silicon oxide containing boron). In addition, a portion of the color filter  80  is disposed to overlap a portion of the adjacent first wiring  51  in a plan view. The second oxide film  62  whose surface is planarized is provided on the color filter  80  and the first wiring  51 . 
     The pixel electrode  27  is provided on the second oxide film  62  so as to overlap the color filter  80  in a plan view. The pixel electrode  27  is disposed to extend to a region overlapping a portion of the second wiring  52  in a plan view. The second wiring  52  is electrically connected to the pixel electrode  27  through a contact hole CN 4 , as shown in  FIG. 6B . 
     In addition, on a side surface of the first wiring  51  (except for the first wiring  51  between the color filters  80 ) and the second wiring  52 , a side wall  61   a  having an inclined surface is disposed through the protective film  53  described above, as shown in  FIG. 6B . The side wall  61   a  is an oxide film. The oxide film is, for example, a low temperature CVD film (TEOS) processed by applying heat of about 150° C. 
     As described above, by forming the side wall  61   a  at a side surface of the second wiring  52 , it is possible to moderate an angle of a concave and convex portion between the first wiring  51  and the second wiring  52 . Therefore, when the second oxide film  62  is formed on the first wiring  51 , the second wiring  52 , and the third interlayer insulation layer  11   d , it is possible to suppress a void (a gap where the second oxide film  62  is not filled) so as not to occur between the second wirings  52 . Such a phenomenon is likely to occur when depositing a TEOS film in a structure having the color filter  80  in the element substrate  10 . 
     A void is less likely to occur between the first wirings  51  in the color filter  80  region than between the second wirings  52 . 
     Method of Manufacturing Liquid Crystal Device Including Method of Manufacturing Substrate for Electro-Optical Device 
       FIG. 7  is a flowchart which shows a method of manufacturing a liquid crystal device in a process order.  FIGS. 8A to 10C  are schematic cross-sectional views which show a method of manufacturing the first wiring and the second wiring of the element substrate among methods of manufacturing a liquid crystal device. Hereinafter, the methods of manufacturing a liquid crystal device will be described referring to  FIGS. 7 to 10C . 
     At first, a method of manufacturing the element substrate  10  side will be described. First, in step S 11 , the TFT  30  is formed on the base material  10   a  which is made of a quartz substrate and the like. Specifically, first, the lower light-shielding film  3   c  (scanning line) which is made of the aluminum  50   a  and the like is formed on the base material  10   a . Thereafter, by using a well-known deposition technique, the underlying insulation layer  11   a  which is made of a silicon oxide film and the like is formed. 
     Next, the TFT  30  is formed on the underlying insulation layer  11   a . Specifically, the TFT  30  is formed using a well-known deposition technique such as a photolithographic technique and an etching technique. 
     In step S 12 , the first wiring  51  and the second wiring  52  are formed. In step S 13 , the protective film  53  is formed. In step S 14 , the color filter  80  is formed. In step S 15 , the side wall  61   a  is formed. In step S 16 , the second oxide film  62  is formed. In step S 17 , the pixel electrode  27  is formed. Hereinafter, detailed manufacturing methods in steps S 12  to S 17  will be described referring to  FIGS. 8A to 10C . 
     First, in a process shown in  FIG. 8A , the first wiring  51  and the second wiring  52  are formed on the third interlayer insulation layer  11   d . Specifically, the first interlayer insulation layer  11   b  to the third interlayer insulation layer  11   d  which includes the TFT  30  and the like described above are formed. The capacitor  16 , the data line  6   a , the contact holes CNT 1  to CNT 4  and the like are not illustrated and a method of manufacturing these are omitted. Next, the aluminum (Al)  50   a  and titanium nitride (TiN)  50   b  are stacked on the third interlayer insulation layer  11   d . Thereafter, the first wiring  51  and the second wiring  52  are patterned by using the photolithographic technique and the etching technique to be formed. 
     In a process shown in  FIG. 8B , a concave portion  80   a  for forming the color filter  80  is formed. Specifically, the concave portion  80   a  is formed in the third interlayer insulation layer  11   d  (in detail, the second interlayer insulation layer  11   c  is also included) between adjacent first wirings  51  by using the photolithographic technique and the etching technique. 
     In a process shown in  FIG. 8C , the first wiring  51 , the second wiring  52 , the concave portion  80   a  (inner surface of the concave portion  80   a ), and the protective film  53  on the third interlayer insulation layer  11   d  are formed. The protective film  53  is a BSG film as described above. 
     In a process shown in  FIG. 9A , the color filter  80  is formed. First, the concave portion  80   a  is filled with a coloring material. As a filling method, a spin coating method, an ink-jet method, and the like can be used. Then, the color filter  80  is cured by heating the coloring material to be completed. 
     In a process shown in  FIG. 9B , the first oxide film  61  are formed on the first wiring  51 , the second wiring  52 , the protective film  53 , and the color filter  80 . The first oxide film  61  is an oxide film (SiO 2 ) which has Tetra Ethyl Ortho Silicate (TEOS) formed by using, for example, a Low Pressure Chemical Vapor Deposition (LPCVD) device, as a raw material. 
     In a process shown in  FIG. 9C , the side wall  61   a  is formed at a side surface of the second wiring  52  through the protective film  53 . Specifically, for example, the side wall  61   a  is formed by performing an etching back process on the first oxide film  61 . Accordingly, the side walls  61   a  which have an inclined surface are formed on side surfaces of the second wiring  52 , and thereby it is possible to moderate an undulation between adjacent second wirings  52 . 
     In a process shown in  FIG. 10A , the second oxide film  62  is formed on the first wiring  51 , the second wiring  52 , the side wall  61   a , the protective film  53 , and the color filter  80 . The second oxide film  62  is an oxide film (SiO 2 ), which has TEOS as a raw material, by using a LPCVD device in the same manner as the first oxide film  61 . Since the side walls  61   a  are formed on side surfaces of the second wiring  52 , it is possible to suppress a void so as not to occur in a gap between adjacent second wirings  52 . 
     In a process shown in  FIG. 10B , a surface of the second oxide film  62  is planarized. As a planarizing method, for example, CMP polishing is exemplified. Accordingly, it is possible to form an oxide film without a void between the second wirings  52 . 
     In a process shown in  FIG. 10C , the pixel electrode  27  is formed. Specifically, first, a contact hole CNT 4  is formed in a region overlapping a portion of the second wiring  52  in a plan view in the second oxide film  62 . Then, on the planarized second oxide film  62 , an ITO film is formed. Next, the pixel electrode  27  is formed in a region overlapping the color filter  80  and the second wiring  52  in a plan view by patterning the ITO film. 
     The contact hole CNT 4  is filled with the ITO film, and thereby the pixel electrode  27  and the source/drain region at a pixel electrode side  30   d  are electrically connected to each other through the second wiring  52  (relay electrode). 
     In step S 18 , the alignment film  28  is formed on the pixel electrode  27  and the second oxide film  62 . As a method of manufacturing the alignment film  28 , an oblique deposition method of obliquely depositing inorganic materials such as silicon oxide (SiO 2 ) and the like are used. Thus, the element substrate  10  side is completed. 
     Next, a method of manufacturing the opposite substrate  20  side will be described. First, in step S 21 , the opposite electrode  31  is formed on the base material  20   a  which is made of light-permeable materials such as a glass substrate and the like by using the well-known deposition technique such as the photolithography technique and the etching technique. Specifically, the opposite electrode  31  can be formed by sputtering and etching a transparent conductive film such as the ITO and the like. 
     In step S 22 , the alignment film  32  is formed on the opposite electrode  31 . A method of manufacturing the alignment film  32  forms the alignment film  32  by using, for example, the oblique deposition method in the same manner as when forming the alignment film  28 . Accordingly, the opposite substrate  20  side is completed. Next, a method of bonding the element substrate  10  and the opposite substrate  20  will be described. 
     In step S 31 , the sealing material  14  is applied onto the element substrate  10 . In detail, by changing a relative positional relationship between the element substrate  10  and a dispenser (possibly a discharge device), the sealing material  14  is applied to the periphery of the display region E (so as to surround the display region E) in the element substrate  10 . 
     As the sealing material  14 , for example, a UV-curable epoxy region is exemplified. The sealing material  14  is not limited to a light-curable resin such as UV rays, and may be made to use a thermosetting resin and the like. In addition, the sealing material  14  includes, for example, a glass fiber or gap materials such as glass beads and the like for setting a gap between the element substrate  10  and the opposite substrate  20  (gap or cell gap) to a predetermined value. 
     In step S 32 , the element substrate  10  and the opposite substrate  20  are bonded together. Specifically, in the element substrate  10 , the element substrate  10  and the opposite substrate e 20  are bonded through the applied sealing material  14 . 
     In step S 33 , a liquid crystal is injected from a liquid crystal inlet into the inside of a structure, and then the liquid crystal inlet is sealed with a sealing material. Sealing materials such as a resin and the like are used in the sealing. Accordingly, the liquid crystal device  100  is completed. 
     Configuration of Electronic Apparatus 
     Next, a projection type display device as an electronic apparatus of the embodiment will be described referring to  FIG. 11 .  FIG. 11  is a schematic diagram which shows a configuration of the projection type display device including the liquid crystal device described above. 
     As shown in  FIG. 11 , a projection type display device  1000  of the embodiment includes a polarization illumination device  1100  disposed along a system optical axis L, two dichroic mirrors  1104  and  1105  as a light separation element, three reflection mirrors  1106 ,  1107 , and  1108 , five relay lenses  1201 ,  1202 ,  1203 ,  1204 , and  1205 , three permeable liquid crystal light valves  1210 ,  1220 , and  1230  as optical modulation means, a cross dichroic prism  1206  as a light synthesizing element, and a projection lens  1207 . 
     The polarization illumination device  1100  is schematically configured to have a lamp-unit  1101  as a light source made of a white light source such as a ultrahigh-pressure mercury lamp, a halogen lamp, or the like, an integrator lens  1102 , and a polarization conversion element  1103 . 
     Among polarized light beams emitted from the polarization illumination device  1100 , the dichroic mirror  1104  reflects red light (R) and allows green light (G) and blue light (B) to pass through the dichroic mirror  1104 . The other dichroic mirror  1105  reflects the green light (G) passing through the dichroic mirror  1104  to allow the blue light (B) to pass through the dichroic mirror  1105 . 
     The red light (R) reflected by the dichroic mirror  1104  is reflected by the reflection mirror  1106 , and is incident on the liquid crystal light valve  1210  via the relay lens  1205 . The green light (G) reflected by the dichroic mirror  1105  is incident on the liquid crystal light valve  1220  via the relay lens  1204 . The blue light (B) passing through the dichroic mirror  1105  is incident on the liquid crystal light valve  1230  via a light guide system which is made of three relay lenses  1201 ,  1202 , and  1203  and two reflection mirrors  1107  and  1108 . 
     The liquid crystal light valves  1210 ,  1220 , and  1230  are respectively disposed to face an incident surface per color light of the cross dichroic prism  1206 . Color light incident on the liquid crystal light valves  1210 ,  1220 , and  1230  is emitted toward the cross dichroic prism  1206  modulated based on image information (image signal). 
     The prism is made by bonding four right angle prisms, and a dielectric multilayer film for reflecting the red light and a dielectric multilayer film for reflecting the blue light are formed in a cross shape at an inner surface of the prism. Three color lights are synthesized by these dielectric multilayer films, and light for displaying a color image is synthesized. The synthesized light is projected to a screen  1300  by a projection lens  1207  which is a projection optical system, and the image is enlarged and displayed. 
     The liquid crystal device  100  described above is applied to the liquid crystal light valve  1210 . The liquid crystal device  100  is disposed at a gap between a pair of polarized elements disposed in a cross Nicol state in an incident side and an emission side of color light. The other liquid crystal light valves  1220  and  1230  are the same as the liquid crystal light valve  1210 . 
     According to such a projection type display device  1000 , using the liquid crystal light valves  1210 ,  1220 , and  1230  makes it possible to obtain high reliability. 
     As an electronic apparatus mounted with the liquid crystal device  100 , in addition to the projection type display device  1000 , various types of electronic apparatus such as an Electrical View Finder (EVF), a mobile mini projector, a head-up display, a smart phone, a mobile phone, a mobile computer, a digital camera, a digital video camera, a display, an automotive apparatus, an audio apparatus, an exposure apparatus, or a lighting apparatus can be used. 
     As described above, according to the element substrate  10 , the method of manufacturing the element substrate  10 , and the liquid crystal device  100 , and the electronic apparatus of the embodiment, effects shown in the followings will be obtained. 
     (1) According to the element substrate  10 , the method of manufacturing the element substrate  10 , and the liquid crystal device  100  of the embodiment, since the first wirings  51  having a light shielding property are provided so as to interpose the color filter  80 , for example, it is possible to prevent light passing through a pixel P from being incident on the color filter  80  of a neighboring pixel P. Accordingly, it is possible to prevent color mixture or light leakage, and to improve a display quality. In addition, since the protective film  53  is provided between the first wiring  51  and the color filter  80 , it is possible to prevent the first wiring  51  from being corroded by contact between the first wiring  51  and the color filter  80 . 
     (2) According to the element substrate  10 , the method of manufacturing the element substrate  10 , and the liquid crystal device  100  of the embodiment, since the first wiring  51  is in a floating state, for example, even if the protective film  53  is not reliably formed in the first wiring  51 , it is possible to suppress a metallic material included in the color filter  80  so as not to affect a function of the first wiring  51  as a wiring. 
     (3) According to the electronic apparatus of the embodiment, since the electronic apparatus of the embodiment includes the liquid crystal device  100  described above, it is possible to provide an electronic apparatus which can improve a display quality. 
     Aspects of the present invention are not limited to the embodiments described above, can be appropriately changed within a scope not contrary to a gist or a concept of the invention which can be read from the claims and an entire specification, and are included in a technical scope of embodiments of the invention. The embodiments can be also performed in a following form. 
     MODIFICATION EXAMPLE 1 
     As described above, it is not limited that the protective film  53  is provided to cover the first wiring  51 , the second wiring  52 , the concave portion  80   a , and the third interlayer insulation layer  11   d , but may also be provided only between the first wiring  51  and the color filter  80  so that at least the first wiring  51  (particularly, the aluminum  50   a ) and the color filter  80  do not come into contact with each other. Accordingly, it is possible to prevent the aluminum  50   a  from being corroded by contact between the first wiring  51  and the color filter  80 . 
     MODIFICATION EXAMPLE 2 
     As described above, it is not limited that the first wiring  51  is set to a light-shielding film and the second wiring  52  is set to a relay electrode, and the other wirings or electrodes having a concave and convex portion may be assumed to be the first wiring  51  and the second wiring  52 . For example, wirings near a driver disposed in a vicinity of the display region E may be assumed to be the first wiring  51  and the second wiring  52 . 
     MODIFICATION EXAMPLE 3 
     As described above, the side wall  61   a  formed on side surfaces of the first wiring  51  and the second wiring  52  is not limited to being formed using the etching back method, but may be formed using the other manufacturing methods. 
     MODIFICATION EXAMPLE 4 
     As described above, end portions of adjacent color filters  80  are not limited to being disposed so as to open a gap above the first wiring  51 , but the end portions of adjacent color filters  80  may also be disposed so as to be adjacent to each other, that is, to straddle each other. Accordingly, display unevenness can be suppressed. 
     MODIFICATION EXAMPLE 5 
     As described above, as an electro-optical device, not only the liquid crystal device  100  but also, for example, an organic El device, a plasma display, an electronic paper and the like are used. 
     The entire disclosure of Japanese Patent Application No. 2013-190201, filed Sep. 13, 2013 is expressly incorporated by reference herein.