Patent Publication Number: US-2021191260-A1

Title: Method for forming color filter array and method for manufacturing electronic device

Description:
BACKGROUND OF THE INVENTION 
     This application is a continuation of U.S. application Ser. No. 15/684,682 filed Aug. 23, 2017, which claims the benefit of Japanese Patent Application No. 2016-167345 filed Aug. 29, 2016, and No. 2017-088511 filed Apr. 27, 2017, which are hereby incorporated by reference herein in their entirety. 
    
    
     FIELD OF THE INVENTION 
     The present disclosure relates to a color filter array. 
     DESCRIPTION OF THE RELATED ART 
     Electronic devices, such as an image capturing device and a display device, employ a color filter array in which color filters of multiple colors are arranged. The color filter array including color filters of multiple colors is hereinafter referred to as a multi-color filter array and is abbreviated as MCFA. The use of MCFA allows a color image to be captured or displayed. 
     Japanese Patent Laid-Open No. 2009-43899 discloses a solid-state image capturing apparatus in which the colors of color filter elements are arranged in Bayer pattern. 
     One of the problems of the MCFA is color shading. Color shading is color unevenness caused by difference in white balance from area to area in the image. 
     SUMMARY OF THE INVENTION 
     The present disclosure provides a technique useful in reducing color shading. 
     A first aspect of the present disclosure is a method for forming a color filter array. The method includes the step of forming a first color filter array by forming a first color filter film on a surface of a base member using a coating method and by patterning the first color filter film and the step of forming a second color filter array by forming a second color filter film on the surface so as to cover the first color filter array using a coating method and by patterning the second color filter film. The first color filter array includes a first pair of color filters adjacent to each other in a predetermined direction with a first clearance therebetween and a second pair of color filters adjacent to each other in the predetermined direction with a second clearance therebetween. The second color filter array includes a first color filter positioned between the first pair of color filters and a second color filter positioned between the second pair of color filters. A width of the first clearance in the predetermined direction is larger than a width of the second clearance in the predetermined direction. Each of the first color filter and the second color filter has a lower surface which is a surface adjacent to the base member and an upper surface which is a surface opposite to the lower surface. A distance from a reference plane extending along the surface to the upper surface of the first color filter and a distance from the reference plane to the upper surface of the second color filter differ from each other. 
     A second aspect of the present disclosure is a method for forming a color filter array. The method includes the step of forming a first color filter array by forming a first color filter film on a surface of a base member using a coating method and by patterning the first color filter film and the step of forming a second color filter array by forming a second color filter film on the surface so as to cover the first color filter array using the coating method and by patterning the second color filter film. The first color filter array includes a first color filter and a second color filter each constituting a pixel. The second color filter array includes a third color filter positioned between the first color filter and the second color filter. A width of the first color filter and a width of the second color filter differ from each other in at least one of a first direction in which the first color filter and the second color filter are arranged and a second direction perpendicular to the first direction. 
     A third aspect of the present disclosure is a method for forming a color filter array. The method includes the step of forming a first color filter array by forming a first color filter film on a surface of a base member using a coating method and by patterning the first color filter film and the step of forming a second color filter array by forming a second color filter film on the surface so as to cover the first color filter array using the coating method and by patterning the second color filter film. The first color filter array includes a first color filter and a second color filter each constituting a pixel. The second color filter array includes a third color filter positioned between the first color filter and the second color filter. The patterning of the first color filter film is performed by photolithography using a photomask. The photomask includes a first opening for exposing a portion of the first color filter film to be the first color filter and a second opening for exposing a portion of the first color filter film to be the second color filter. The first opening and the second opening have different widths in a direction in which the first opening and the second opening are arranged. 
     Further features of the present disclosure will become apparent from the following description of exemplary embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a cross-sectional view of an electronic device (an image capturing device). 
         FIG. 1B  is a cross-sectional view of an electronic device (a display device). 
         FIGS. 2A to 2C  are schematic plan views of an MCFA illustrating a method for forming the MCFA according to an embodiment of the present disclosure. 
         FIGS. 3A to 3C  are schematic cross-sectional views of an MCFA illustrating the method for forming the MCFA according to the embodiment. 
         FIGS. 4A to 4C  are schematic cross-sectional views of the MCFA illustrating the method for forming the MCFA according to the embodiment. 
         FIGS. 5A and 5B  are graphs for illustrating the method for forming the MCFA according to the embodiment. 
         FIGS. 6A to 6C  are schematic plan views of an MCFA illustrating a method for forming the MCFA according to a second embodiment of the present disclosure. 
         FIGS. 7A to 7C  are schematic cross-sectional views of the MCFA illustrating the method for forming the MCFA according to the second embodiment. 
         FIGS. 8A to 8C  are schematic cross-sectional views of an MCFA illustrating a method for forming the MCFA according to a third embodiment of the present disclosure. 
         FIGS. 9A to 9C  are schematic cross-sectional views of an MCFA illustrating a method for forming the MCFA according to a comparative embodiment. 
         FIG. 10A  is a schematic plan view of an electronic device according to an embodiment of the present disclosure. 
         FIG. 10B  is a schematic cross-sectional view of the electronic device according to the embodiment. 
         FIGS. 11A to 11C  are schematic cross-sectional views of an MCFA illustrating a method for forming the MCFA according to an embodiment of the present disclosure. 
         FIGS. 12A to 12C  are schematic plan views of an MCFA illustrating a method for forming the MCFA according to a sixth embodiment of the present disclosure. 
         FIGS. 13A to 13C  are schematic cross-sectional views of the MCFA illustrating the method for forming the MCFA according to the sixth embodiment. 
         FIGS. 14A to 14C  are schematic cross-sectional views of the MCFA illustrating the method for forming the MCFA according to the sixth embodiment. 
         FIGS. 15A to 15C  are schematic cross-sectional views of an MCFA illustrating a method for forming the MCFA according to a comparative embodiment. 
         FIGS. 16A to 16C  are schematic cross-sectional views of the MCFA illustrating the method for forming the MCFA according to the comparative embodiment. 
         FIG. 17A  is a graph for illustrating a method for forming MCFAs according to seventh to ninth embodiments of the present disclosure. 
         FIG. 17B  is a schematic plan view of a photomask for illustrating a method for forming the MCFA according to the seventh embodiment. 
         FIG. 17C  is a schematic plan view of a photomask for illustrating a method for forming an MCFA according to an eighth embodiment of the present disclosure. 
         FIGS. 18A and 18B  are schematic cross-sectional views of an MCFA illustrating a method for forming the MCFA according to the seventh embodiment of the present disclosure. 
         FIGS. 19A and 19B  are schematic cross-sectional views of the MCFA illustrating the method for forming the MCFA according to the seventh embodiment. 
         FIGS. 20A and 20B  are schematic cross-sectional views of the MCFA illustrating the method for forming the MCFA according to the seventh embodiment. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Embodiments of the present disclosure will be described hereinbelow with reference to the drawings. In the following descriptions and drawings, common configurations among the plurality of drawings are given the same reference signs. For that reason, the common configurations will be described with reference to the drawings, and descriptions of the configurations given the same reference signs will be omitted as appropriate. 
       FIG. 1A  illustrates an image capturing device IS, and  FIG. 1B  illustrates a display device DP as examples of an electronic device including a multi-color filter array. A MCFA  50  is disposed on a base member  400 . 
     Referring to  FIG. 1A , the structure of the image capturing device IS, which is an example of the electronic device, will be described. The base member  400  includes a semiconductor substrate  100  including photoelectric conversion units  101 , such as photodiodes, and a multilayer wiring structure on the semiconductor substrate  100 . The multilayer wiring structure includes wiring layers  210 ,  220 , and  230  layered with an interlayer insulating film  200  therebetween. A passivation film  310  and a planarizing film  320  are disposed on the multilayer wiring structure. In the present embodiment, the wiring layers  210 ,  220 , and  230  are made of aluminum wiring lines, and the interlayer insulating film  200  are made of silicon oxide film. The passivation film  310  on the wiring layers  210 ,  220 , and  230  has a three layer structure of silicon oxynitride (SiON), silicon nitride (SiN), and SiON. The MCFA  50  is disposed on the planarizing film  320 . A microlens array  340  is disposed on the MCFA  50 , with a planarizing film  330  therebetween. 
     Referring to  FIG. 1B , the structure of the display device DP, which is an example of the electronic device, will be described. A base member  400  includes a semiconductor substrate  100  including transistors  102  and a multilayer wiring structure on the semiconductor substrate  100 . The multilayer wiring structure includes wiring layers  210  and  220  layered with an interlayer insulating film  200  therebetween. A plurality of pixel electrodes  130  and a counter electrode  150  that faces the pixel electrodes  130  are disposed on the multilayer wiring structure. The pixel electrodes  130  function as one of a positive electrode and an opposing electrode. The counter electrode  150  functions as the other of the positive electrode and the opposing electrode. A light emitting layer  140  made of an organic semiconductor material is disposed between the pixel electrodes  130  and the counter electrode  150 . An insulating member  135  for separation is disposed between the pixel electrode  130 . The counter electrode  150  can be a transparent conductive film. A passivation film  310  and a planarizing film  320  are disposed on the counter electrode  150 . The MCFA  50  is disposed on the planarizing film  320 . A protective film  350  is disposed on the MCFA  50 . 
     An image capturing apparatus including the image capturing device and a display unit including the display device can further include a container (package) for housing the electronic device. The package can include a cover facing the electronic device and a connecting member for transmitting and receiving signals between the electronic device and an external device. 
     The image capturing apparatus can constitute an imaging system. The imaging system is an information terminal including a camera or an image capturing function. The imaging system can include a signal processing unit that processes signals acquired from the image capturing apparatus and a display unit that displays images captured by the image capturing apparatus. 
     The display unit can constitute a display system. The display system is an information terminal including a display or a display function. The display system can include a signal processing unit that processes signals input to the display unit and an image capturing apparatus that acquires an image to be displayed on the display unit. 
     Regarding first to fifth embodiments of the present disclosure, common matter of the first to fifth embodiments will be first described. 
     Common Matter of First to Fifth Embodiments 
     Referring to  FIGS. 2A to 2C , the configuration of the MCFA  50  and a method for forming the MCFA  50  will be described.  FIG. 2C  is a plan view of the MCFA  50 .  FIGS. 2A and 2B  illustrate states in the process of forming the MCFA  50  into the state illustrated in  FIG. 2C . 
     The MCFA  50  is constituted by color filter arrays of multiple colors including a color filter array  10 , a color filter array  20 , and a color filter array  30 . An area where the MCFA  50  is disposed serves as an image capturing area in an image capturing device and a display area in a display device. The color filter arrays  10 ,  20 , and  30  of individual colors each include a plurality of color filters arranged in a one-dimensional pattern or a two-dimensional pattern in the placement area. Each of the plurality of color filters in each color filter array corresponds to one pixel. The plurality of color filters constituting the color filter arrays  10 ,  20 , and  30  are discontinuously disposed in a certain direction. However, the plurality of color filters constituting the color filter arrays  10 ,  20 , and  30  may be disposed partially continuously at the corners and so on. Arrangement by color may be of a honeycomb type or a stripe type, in addition to the Bayer type of the present embodiment. 
     The color filter arrays  10 ,  20 , and  30  have different main wavelengths at which visible light is passed through (wavelengths at which the transmittance of visible light is maximum) for each color. For example, the color filter array  10  is formed of color filters (green filters) that mainly transmit green (G). The color filter array  20  is formed of color filters (blue filters) that mainly transmit blue (B). The color filter array  30  is formed of color filters (red filters) that mainly transmit red (R). The MCFA  50  can be formed by combining the color filter arrays  10 ,  20 , and  30 . The combination of colors is not limited to the RGB system but may be a CMY system or a combination thereof. The MCFA  50  may be configured to partially transmit white light (W). In the present embodiment, the color filter array  10  has its main wavelength in a green wavelength range, the color filter array  20  in a blue wavelength range, and the color filter array  30  in a red wavelength range. 
     As illustrated in  FIGS. 2A to 2C , the MCFA  50  includes a central portion  110  and a peripheral portion  120 . In the placement area of the MCFA  50 , a boundary  53  between the central portion  110  and the peripheral portion  120  is set between a center  51  and an edge  52  of the MCFA  50 , and the inside of the boundary  53  (near to the center  51 ) is the central portion  110 , and the outside of the boundary  53  (near to the edge  52 ) is the peripheral portion  120 . The boundary  53  can be set at an equal distance from the center  51  and the edge  52 . In other words, points on the boundary  53  are positioned at midpoints between points on the edge  52  and the center  51 . 
       FIGS. 3A to 3C  and  FIGS. 4A to 4C  are cross-sectional views of part of the central portion  110  and the peripheral portion  120  in the individual steps in the method of manufacturing an electronic device including forming the MCFA  50 . 
       FIG. 2A  illustrates a process G of forming the color filter array  10 .  FIGS. 3A, 3B, and 3C  and  FIG. 4A  illustrate cross sections of individual steps included in the process G. 
     At step Ga illustrated in  FIG. 3A , the base member  400  formed by an appropriate semiconductor process or the like is arranged. The base member  400  has a surface extending in an X-direction and in a Y-direction crossing (perpendicular to) the X-direction. Thickness and height indicate a position in a Z-direction crossing (perpendicular to) the X-direction and the Y-direction. In the following description, the surface will be described separately for a surface  410  in the central portion  110  and a surface  420  in the peripheral portion  120 . 
       FIG. 3A  illustrates, for the surface of the base member  400 , the height H 10  of the surface  410  in the central portion  110 , and the height H 20  of the surface  420  in the peripheral portion  120 . The height of a predetermined surface is a distance from a reference plane  500  to the predetermined surface. The reference plane  500  is a flat surface parallel to the X-direction and the Y-direction. Although the position of the reference plane  500  in the Z-direction is an any position, the surface of the semiconductor substrate  100  is set as the reference plane  500  in the present embodiment.  FIG. 3A  illustrates the difference between the height H 10  and the height H 20 , that is, the difference in height, HD 0 , (HD 0 =|H 10 −H 20 |) between the surface  410  and the surface  420 . 
     At step Gb illustrated in  FIG. 3B , a color filter film  600  is formed on the base member  400  using a coating method. The thickness of the color filter film  600  is preferably about 500 nm to 1,000 nm. A typical example of the coating method is a spin coating method, but a dipping method or a spray method may be used. The viscosity of a liquid composition used as the material of the color filter film  600  applied to the base member  400  is preferably 1 mPa·S to 20 mPa·S. The rotational speed in the application in the spin coating method is preferably from 300 rpm to 2,500 rpm. 
     Next, the color filter film  600  is patterned by photolithography (exposure and development). At step Gc in  FIG. 3C , the color filter film  600  is exposed to light using an appropriate photomask  510 . Although the color filter film  600  of the present embodiment is a negative-type photosensitive resin, the color filter film  600  may be a positive-type photosensitive resin. 
     At step Gd illustrated in  FIG. 4A , the exposed color filter film  600  is developed. The exposed part of the color filter film  600 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  600  remaining after the patterning forms the color filter array  10 . 
     As illustrated in  FIGS. 2A and 4A , the color filter array  10  includes a pair of color filters  11  and  12  next to each other in the X-direction, with a clearance  1  therebetween. The color filter array  10  further includes a pair of color filters  13  and  14  next to each other in the X-direction, with a clearance  2  therebetween. The clearance may be expressed, in other words, as a gap.  FIG. 4A  illustrates a width W 1  of the clearance  1  in the X-direction and a width W 2  of the clearance  2  in the X-direction. 
     The respective widths W 1  and W 2  of the clearances  1  and  2  may be measured at a height at which a middle plane at an equal distance from the upper surface and the lower surface of the color filters  11  and  12  or the color filters  13  and  14  is positioned. The widths W 1  and W 2  of the clearances  1  and  2  may also be measured at a height at which the upper surfaces or the lower surfaces of the color filters  11  and  12  or the color filters  13  and  14  are positioned. However, width measurement errors due to residue of the color filters, an abnormal shape of the end, and so on can be more reduced when the widths W 1  and W 2  are measured at the height at which the middle plane is positioned than at the height of the upper surfaces or the height of the lower surfaces. As illustrated in  FIG. 2A , the color filter array  10  further includes a pair of color filters  15  and  16  next to each other in the Y-direction, with a clearance  3  therebetween. The color filter array  10  further includes a pair of color filters  17  and  18  in the Y-direction, with a clearance  4  therebetween. A width W 3  of the clearance  3  in the Y-direction and a width W 4  of the clearance  4  in the Y-direction are not shown. 
     The widths of the clearances  1  to  4  are compared in the same direction (for example, the X-direction or the Y-direction). For example, a comparison between the width of the clearance  1  in the X-direction and the width of the clearance  2  in the Y-direction does not make sense. The width W 1  of the clearance  1  can be controlled by adjusting the line widths of the color filters  11  and  12  positioned on both sides of the clearance  1 , and the width W 2  of the clearance  2  can be controlled by adjusting the line widths of the color filters  13  and  14  positioned on both sides of the clearance  2 . The width W 1  of 99% or less or 101% or higher of the width W 2  is suitable in making the width W 1  and the width W 2  differ in all embodiments of the present disclosure. In contrast, when the width W 1  is at least 99.9% or higher and 100.1% or less of the width W 2 , the width W 1  and the width W 2  can be considered to be the same. In all embodiments of the present disclosure, the width W 1  is preferably 90% or higher and 110% or less of the width W 2 , and more preferably, the width W 1  is 95% or higher and 105% or less of the width W 2 . This is because an extreme difference between the width W 1  and the width W 2  can cause a difference in sensitivity and a difference in luminance due to a difference in pixel size. The difference between the width W 1  and the width W 2  is set smaller than the line width of a wiring layer  230 , which is the uppermost wiring layer under the MCFA  50 . Even if the width W 1  and the width W 2  differ, when the difference is less than the line width of the uppermost wiring layer, the influence of the sensitivity difference and the luminance difference due to a difference in pixel size can be minimized. The clearances between color filters and the widths of the color filters on both sides of each clearance can be adjusted by appropriately designing the mask pattern of the photomask  510  according to the target widths of the clearances. 
     In  FIG. 2A , the widths of the clearances in the color filter array  10  in the X-direction and the Y-direction are classified into three kinds and indicated by hatching. A clearance GL of a first kind is larger in width than a clearance GS of a second kind. A clearance GM of a third kind has a width between the width of the clearance GL of the first kind and the width of the clearance GS of the second kind. The clearance  1  is classified as the clearance GL of the first kind, and the clearance  2  is classified as the clearance GS of the second kind. The clearance GM of the third kind is positioned in the vicinity of the boundary  53 . 
       FIG. 2B  illustrates a process B of forming the color filter array  20 .  FIGS. 4B and 4C  illustrate cross sections of the individual steps of the process B. 
     At step Bb illustrated in  FIG. 4B , a color filter film  700  is formed on the base member  400  so as to cover the color filter array  10  using a coating method. The thickness of the color filter film  700  is preferably about 500 nm to 1,000 nm. A typical example of the coating method is a spin coating method, but a dipping method or a spray method may be used. The viscosity of a liquid composition used as the material of the color filter film  700  applied to the base member  400  is preferably 1 mPa·S to 20 mPa·S. The rotational speed in the application in the spin coating method is preferably from 300 rpm to 2,500 rpm. 
     Next, the color filter film  700  is patterned by photolithography (exposure and development). At step Bb in  FIG. 4B , the color filter film  700  is exposed to light using an appropriate photomask  520 . Although the color filter film  700  of the present embodiment is a negative-type photosensitive resin, the color filter film  700  may be a positive-type photosensitive resin. 
     At step Bc illustrated in  FIG. 4C , the exposed color filter film  700  is developed. The exposed part of the color filter film  700 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  700  remaining after the patterning forms the color filter array  20 . 
     The color filter array  20  includes a color filter  21  positioned between the pair of color filters  11  and  12 . The color filter array  20  further includes a color filter  22  positioned between the pair of color filters  13  and  14 . The color filter  21  is disposed in the clearance  1  illustrated in  FIGS. 2A and 4A , and the color filter  22  is disposed in the clearance  2  illustrated in  FIGS. 2A and 4A . In the X-direction, the color filter  21  has a width corresponding to the width W 1  of the clearance  1 , and the color filter  22  has a width corresponding to the width W 2  of the clearance  2 . As illustrated in  FIGS. 2B and 2C , the color filter array  20  further includes a color filter  23  positioned between the pair of color filters  15  and  16 . The color filter array  20  further includes a color filter  24  positioned between the pair of color filters  17  and  18 . The color filter  23  is disposed in the clearance  3  illustrated in  FIG. 2A , and the color filter  24  is disposed in the clearance  4  illustrated in  FIG. 2A . In the Y-direction, the color filter  23  has a width corresponding to the width W 3  of the clearance  3 , and the color filter  24  has a width corresponding to the width W 4  of the clearance  4 . Each of the color filter  21  and the color filter  22  has a lower surface, which is a surface adjacent to the base member  400 , and an upper surface, which is a surface opposite to the lower surface. 
     The height H 21  of the upper surface of the color filter  21  is a distance from the reference plane  500  to the upper surface of the color filter  21 . Likewise, the height H 22  of the upper surface of the color filter  22  is a distance from the reference plane  500  to the upper surface of the color filter  22 . The height L 21  of the lower surface of the color filter  21  is a distance from the reference plane  500  to the lower surface of the color filter  21 . Likewise, the height L 22  of the lower surface of the color filter  22  is a distance from the reference plane  500  to the lower surface of the color filter  22 . 
     The thickness T 21  of the color filter  21  corresponds to the distance between the upper surface and the lower surface of the color filter  21  and corresponds to the difference (T 21 =H 21 −L 21 ) between the height H 21  and the height L 21 . Likewise, the thickness T 22  of the color filter  22  corresponds to the distance between the upper surface and the lower surface of the color filter  22  and corresponds to the difference (T 22 =H 22 −L 22 ) between the height H 22  and the height L 22 . 
     In  FIG. 2B , the heights of the upper surfaces of the color filters (second-color filters) of the color filter array  20  are classified into three kinds and indicated by hatching. The height of the upper surface of a second-color filter BL of a first kind is smaller than the height of the upper surface of a second-color filter BH of a second kind. The upper surface of a second-color filter BM of a third kind has a height between the height of the upper surface of the second-color filter BL of the first kind and the height of the upper surface of the second-color filter BL of the second kind. The second-color filter BM of the third kind is positioned in the vicinity of the boundary  53 . 
       FIG. 2C  illustrates a process R of forming the color filter array  30 . The color filter array  30  is also formed by forming a color filter film using the spin coating method and by patterning the color filter film, as the color filter array  20  is. The color filters of the color filter array  30  are formed in clearances of the clearances formed at the process G, in which the color filter array  20  is not formed at the process B. The film thickness of the color filter film formed at the process R may be larger then the film thickness of the color filter film  600  and the film thickness of the color filter film  700 . The large thickness of the third-color filter film relatively reduces an influence of unevenness in the thickness of the third-color filter array due to the unevenness of the surfaces of the color filter arrays formed at the process G and the process B, if occurs, on unevenness in transmissivity. The thicknesses of the color filter film and the color filter array of the third color can be 110% or more of the thicknesses of color filter films and the color filter arrays of the first and second colors. For example, the thickness of the third-color filter may be 800 nm to 1,000 nm, in contrast to the first- and second-color filters having a thickness of 600 nm to 800 nm. In  FIGS. 1A and 1B , the thickness of the color filter array  30  is larger than the thicknesses of the color filter arrays  10  and  20 . 
     In  FIG. 2C , the heights of the upper surfaces of the color filters (third-color filters) of the color filter array  30  are classified into three kinds and indicated by hatching. The height of the upper surface of a third-color filter RL of a first kind is smaller than the height of the upper surface of a third-color filter RH of a second kind. The upper surface of a third-color filter RM of a third kind has a height between the height of the upper surface of the third-color filter RL of the first kind and the height of the upper surface of the third-color filter RH of the second kind. The third-color filter RM of the third kind is positioned in the vicinity of the boundary  53 . 
     The distance between the color filters  11  and  12  and the distance between the color filters  13  and  14 , described above, differ from each other, but the distance (pitch) between the centers of the color filters  11  and  12  and the distance (pitch) between the centers of the color filters  13  and  14  may be equal to each other. Even if the pitch has an error due to a manufacturing error, the center-to-center distance of the color filters  11  and  12  may be 99% or more and 101% or less, or 99.9% or more and 100.1% or less of the center-to-center distance of the color filters  13  and  14 . Likewise, the center-to-center distance (pitch) of the color filters  11  and  21  and the center-to-center distance (pitch) of the color filters  13  and  22  may be equal to each other. Even if the pitch has an error due to a manufacturing error, the center-to-center distance of the color filters  11  and  21  may be 99% or more and 101% or less, or 99.9% or more and 100.1% or less of the color filters  13  and  22 . The arrangement pitch of the multicolor filters can be smaller than the arrangement pitch of the photoelectric conversion units  101 . 
     First Embodiment 
     The shapes of the color filter arrays  10  and  20  according to a first embodiment of the present disclosure will be described. 
     In the first embodiment, as illustrated in  FIG. 3A , the surface  420  in the peripheral portion  120  of the base member  400  is higher than the surface  410  in the central portion  110  (H 10 &lt;H 20 ). 
     The interlayer insulating layer, which is included in the interlayer insulating film  200 , for insulating the wiring layers in the base member  400  is planarized by chemical mechanical polishing (CMP). The planarization using the CMP method causes a difference in polishing rate because of a difference in wiring density. Specifically, the polishing rate is high in the image capturing area where the wiring density is low, and the polishing rate is low in the peripheral circuit area where the wiring density is high. As a result, the thickness of the interlayer insulating film  200  can be larger in the peripheral portion  120  nearer to the peripheral circuit area than in the central portion  110 . This can cause the surface  420  to be higher than the surface  410 . 
     As illustrated in  FIG. 3A , the multilayer wiring structure of the image capturing area has three wiring layers  210 ,  220 , and  230 , while the peripheral circuit area has four wiring layers  210 ,  220 ,  230 , and  240 . For that reason, the upper surfaces of the passivation film  310  and the planarizing film  320  in the peripheral circuit area are higher than the surfaces in the image capturing area by a thickness corresponding to the wiring layer  240 . As a result, the upper surfaces of the passivation film  310  and the planarizing film  320  can be higher in the peripheral portion  120  nearer to the peripheral circuit area than in the central portion  110 . This can cause the surface  420  to be higher than the surface  410 . 
     The color filter film  600  formed on the base member  400 , which serves as a foundation having no local unevenness, by a coating method at step Gb illustrated in  FIG. 3B  can have a film thickness substantially equal in the central portion  110  and in the peripheral portion  120  because of the surfaces  410  and  420  of the foundation base member  400 . For that reason, the height difference of the upper surface of the color filter film  600  corresponds to the height difference HD 0  of the surface of the base member  400 . 
     In the first embodiment, the width W 1  of the clearance  1  in the X-direction is larger than the width W 2  of the clearance  2  in the X-direction (W 1 &gt;W 2 ). As described above, the width W 1  is preferably 101% or more of the width W 2  and also 110% or less, and more preferably, 105% or less. The width W 3  of the clearance  3  in the Y-direction is larger than the width W 4  of the clearance  4  in the Y-direction (W 3 &gt;W 4 ). The clearance GL of the first kind, represented by the clearance  1  having the width W 1 , is positioned in the central portion  110 , and the clearance GS of the second kind, represented by the clearance  2  having the width W 2 , is positioned in the peripheral portion  120 . 
     The color filters  11  and  12  on both sides of the clearance  1  are positioned in the central portion  110 , and the color filters  13  and  14  on both sides of the clearance  2  are positioned in the peripheral portion  120 . The line widths of the color filters  11  and  12  in the central portion  110  are smaller in the X-direction than the line widths of the color filters  13  and  14  in the peripheral portion  120 . 
     The thickness of the color filter film  700  formed using a coating method on the base member  400 , which is a foundation having local unevenness due to the color filter array  10 , is influenced by the shape of the color filter array  10 . In other words, the upper surface of the color filter film  700  tends to be lower in height in a wide interval portion of the color filter array  10  than in a narrow interval portion of the color filter array  10 . This can be thought of as follows. Assume that the volume of the material of the color filters, which is a liquid composition supplied per unit area, is constant. Each clearance of the color filter array  10  serves as a container of the color filter material. The narrow clearance of the color filter array  10  means that the bottom area of the container is small. The liquid level of a constant volume of liquid composition held in a container with a small bottom area is high. This leads to a phenomenon in which the upper surface of the color filter film  700  tends to be high in the narrow interval portions of the color filter array  10 . This phenomenon can be suitably used when the viscosity of the liquid composition, which is the material of the color filter film  700  to be applied to the base member  400 , is 1 mPa·S to 20 mPa·S. This phenomenon can also be suitably used when the rotational speed in the spin coating method is 300 rpm to 2,500 rpm.  FIG. 5A  illustrates the relationship between the line width (the horizontal axis, WIDTH) of each of color filters on both sides of one clearance and the film thickness (the vertical axis, THICKNESS) of a color filter disposed in the clearance. The width of the clearance decreases and the film thickness of the color filter formed in the clearance increases as the line width of each of the color filters on both sides increases. The inclination in  FIG. 5A  is, for example, 0.05 to 0.25. For example, changing the width of the clearance of the first-color filter by 100 nm allows the film thickness of the second-color filter formed in the clearance to be changed by about 5 nm to 25 nm. 
     The thickness of the color filter film  700  can be controlled by adjusting the width of the clearance, as described above. For that reason, even if the line widths of color filters on both sides of the clearance of the color filter array  10  are equal, the thickness of the color filter film  700  can be controlled by changing the width of the clearance. However, the thickness of the color filter film  700  can also be controlled by adjusting the line widths of color filters on both sides of the clearance of the color filter array  10 . This is because the liquid composition serving as the material of the color filter film  700  is also formed on the color filters on both sides. The larger the widths of the color filters on both sides, the more advantageous to keep the height of the upper surface of the color filter film  700  on the clearance high. Therefore, it is effective to decrease the width of the clearance and increase the line widths of color filters on both sides of the clearance in order to increase the thickness of the color filter disposed in the clearance. To decrease the thickness of the color filter, reverse this. As illustrated in  FIG. 2A , constituting the plurality of color filters of the color filter array  11  so as to be partially continuous at the corners allows the clearance to be enclosed without break by the color filters of the color filter array  11 . This configuration prevents the color filter material from flowing out of the clearance to another clearance, which is advantageous in controlling the thickness of the color filter film by adjusting the width of the clearance. 
     The height H 21  of the upper surface of the color filter  21  and the height H 22  of the upper surface of the color filter  22  differ from each other (H 22 ≈H 21 ) on the basis of the relationship illustrated in  FIG. 5A . In the present embodiment, the height H 22  is larger than the height H 21  (H 22 &gt;H 21 ). In the present embodiment, the height L 22  is larger than the height L 21  (L 22 &gt;L 21 ). The height L 21  approximately corresponds to the height H 10 , and the height L 22  approximately corresponds to the height H 20 . The relation L 22 &gt;L 21  holds because H 20 &gt;H 10 . 
     As illustrated in  FIG. 2B , the second-color filter BL of the first kind represented by the color filter  21  having the thickness T 21  is positioned in the central portion  110 . The second-color filter BH of the second kind represented by the color filter  22  having the thickness T 22  is positioned in the peripheral portion  120 . 
     Let TD 2  be the difference between the thickness T 21  of the color filter  21  and the thickness T 22  of the color filter  22  (TD 2 =T 22 −T 21 ). The difference in thickness, TD 2 , is smaller than the difference (L 22 −L 21 ) between the height L 21  of the lower surface of the color filter  21  and the height L 22  of the lower surface of the color filter  22  (TD 2 =T 22 −T 21 &lt;L 22 −L 21 ). The thickness T 21  of the color filter  21  and the thickness T 22  of the color filter  22  may be equal to each other. The thickness T 21  of the color filter  21  corresponds to the distance between the upper surface and the lower surface of the color filter  21  and corresponds to the difference (T 21 =H 21 −L 21 ) between the height H 21  and the height L 21 . Likewise, the thickness T 22  of the color filter  22  corresponds to the distance between the upper surface and the lower surface of the color filter  22  and corresponds to the difference (T 22 =H 22 −L 22 ) between the height H 22  and the height L 22 . 
     Therefore, T 22 −T 21 &lt;L 22 −L 21  means that the difference (TD 2 ) between the thicknesses of the color filters  21  and  22  is smaller than the height difference (HD 0 ) of the surface of the base member  400  which is the foundation (TD 2 &lt;HD 0 ). The difference in thickness, TD 2 , can be reduced to one fifth or less, or even one tenth or less of the height difference HD 0 . For example, when the height difference between the surfaces  410  and  420  of the base member  400  is 100 nm to 300 nm, the difference in thickness between the color filters  21  and  22  can be set to about 10 nm to 30 nm. 
     By decreasing the difference in thickness, TD 2 , between the color filters  21  and  22 , the difference in transmittance between the color filters  21  and  22  can be decreased. In the image capturing device IS, the difference in sensitivity between the pixel of the color filter  21  and the pixel of the color filter  22  can be decreased. In the display device DP, the difference in luminance between the pixel of the color filter  21  and the pixels of the color filter  22  can be decreased. 
     Comparative Embodiment 
       FIGS. 9A to 9C  illustrate a comparative embodiment in which the base member  400  (H 10 &lt;H 20 ) of the first embodiment illustrated in  FIG. 3A  is subjected to a different process at steps corresponding to the steps in  FIGS. 4A to 4C . 
       FIG. 9A  illustrates a step similar to  FIG. 4A , but the width W 1  of the clearance  1  is equal to the width W 2  of the clearance  2  (W 1 =W 2 ).  FIG. 9B  illustrates a step similar to  FIG. 4B . There is little height difference in the upper surface of the color filter film  700  between the central portion  110  and the peripheral portion  120 . 
       FIG. 9C  illustrates a step similar to  FIG. 4C . When the color filter film  700  whose upper surface has little height difference is patterned, the height H 21  of the upper surface of the color filter  21  and the height H 22  of the upper surface of the color filter  22  become equal to each other (H 21 =H 22 ). Meanwhile, the height L 21  of the lower surface of the color filter  21  becomes lower than the height L 22  of the lower surface of the color filter  22  (L 21 &lt;L 22 ) in correspondence with the relationship between the height H 10  of the surface  410  of the base member  400  and the height H 20  of the surface  420  (H 10 &lt;H 20 ). Therefore, the thickness T 21  (T 21 =H 21 −L 21 ) of the color filter  21  becomes larger than the thickness T 22  (T 22 =H 22 −L 22 ) of the color filter  22 . This increases the difference in transmittance between the pixels of the color filters  21  and  22  and increases the difference in transmittance between the pixel of the color filter  21  and the pixel of the color filter  22 . This difference in transmittance causes the amount of light passing through the color filters to be larger in the peripheral portion  120  than in the central portion  110 , causing color shading. 
     In contrast, the first embodiment reduces the difference in thickness between the color filters  21  and  22  formed in the clearances  1  and  2  by making the widths of the clearance  1  and the clearance  2  different, thereby reducing the difference in transmittance between the color filters  21  and  22 . 
     Second Embodiment 
     There are two major differences between the second embodiment and the first embodiment. The first difference is that the height H 10  of the surface  410  in the central portion  110  is larger than the height H 20  of the surface  420  in the peripheral portion  120  (H 10 &gt;H 20 ). The second difference is that the color filters  11  and  12  and the clearance  1  therebetween are positioned in the peripheral portion  120 , and the color filters  13  and  14  and the clearance  2  therebetween are positioned in the central portion  110 . 
       FIGS. 6A to 6C  are diagrams similar to  FIGS. 2A to 2C , but the clearance GL of the first kind represented by the clearance  1  having the width W 1  is positioned in the peripheral portion  120 , and the clearance GS of the second kind represented by the clearance  2  having the width W 2  is positioned in the central portion  110 . The second-color filter BL of the first kind represented by the color filter  21  having the thickness T 21  is positioned in the peripheral portion  120 , and the second-color filter BH of the second kind represented by the color filter  22  having the thickness T 22  is positioned in the central portion  110 . The third-color filter RL of the first kind is positioned in the peripheral portion  120 , and the third-color filter RH of the second kind is positioned in the central portion  110 . 
       FIG. 7A  illustrates a step corresponding to  FIG. 4A . The color filter array  10  includes the pair of color filters  11  and  12  disposed in the peripheral portion  120  with the clearance  1  therebetween and includes the pair of color filters  13  and  14  disposed in the central portion  110  with the clearance  2  therebetween. The width W 1  of the clearance  1  in the X-direction is larger than the width W 2  of the clearance  2  in the X-direction (W 1 &gt;W 2 ). 
     The color filter array  10  further includes the pair of color filters  15  and  16  disposed in the peripheral portion  120  with the clearance  3  therebetween, and includes the pair of color filters  17  and  18  disposed in the central portion  110  with the clearance  4  therebetween. The width W 3  of the clearance  3  in the Y-direction is larger than the width W 4  of the clearance  4  in the Y-direction (W 3 &gt;W 4 ). 
       FIG. 7B  illustrates a step corresponding to  FIG. 4B . The thickness of the color filter film  700  formed using a coating method on the base member  400 , which is a foundation having local unevenness due to the color filter array  10 , is influenced by the shape of the color filter array  10 . In other words, the upper surface of the color filter film  700  tends to be lower in height in a wide interval portion of the color filter array  10  than in a narrow interval portion of the color filter array  10 . 
       FIG. 7C  illustrates a step corresponding to  FIG. 4C . The upper surface of the color filter film  700  is lower in the peripheral portion  120  than in the central portion  110 . Therefore, this also applies to the upper surfaces of the color filters  21  and  22  obtained by patterning the color filter film  700 . In other words, the height H 21  of the upper surface of the color filter  21  positioned in the peripheral portion  120  is less than the height H 22  of the upper surface of the color filter  22  positioned in the central portion  110  (H 22 &gt;H 21 ). In the present embodiment, the relation L 22 &gt;L 21  holds because H 10 &gt;H 20 . Let TD 2  be the difference between the thickness T 21  of the color filter  21  and the thickness T 22  of the color filter  22  (TD 2 =T 22 −T 21 ). The difference in thickness, TD 2 , is smaller than the difference (L 22 −L 21 ) between the height L 21  of the lower surface of the color filter  21  and the height L 22  of the lower surface of the color filter  22  (TD 2 =T 21 −T 22 &lt;L 22 −L 21 ). The thickness T 21  of the color filter  21  and the thickness T 22  of the color filter  22  may be equal to each other. This also applies to the color filters  23  and  24  positioned in the clearances  3  and  4  obtained by patterning the color filter film  700 . 
     In the second embodiment, the surface  420  of the peripheral portion  120  is lower than the surface  410  of the central portion  110 . In this case, if the clearance of the color filter array  10  is formed with a uniform width, the thickness of the color filter array  20  is larger in the peripheral portion  120  than in the central portion  110 . This causes a sensitivity distribution between the central portion  110  and the peripheral portion  120 , increasing the color shading. For that reason, the clearance of the color filter array  10  is increased in size in the peripheral portion  120  than in the central portion  110 . This allows the difference in the film thickness of the color filter film  700  between the peripheral portion  120  and the central portion  110  to be smaller than the height difference between the surface  410  and the surface  420  in forming the color filter film  700 . This allows the difference TD 2  between the thickness T 21  of the color filter  21  and the thickness T 22  of the color filter  22  to be smaller than the difference HD 0  also after the color filter array  30  is formed. This reduces the transmittance distribution of the color filters, decreasing the color shading. 
     Third Embodiment 
     A major difference between the third embodiment and the second embodiment is the relationship between the height H 10  of the surface  410  in the central portion  110  and the height H 20  of the surface  420  in the peripheral portion  120 . 
       FIG. 8A  illustrates a step corresponding to  FIG. 7A . The difference HD 0  between the height H 10  of the surface  410  in the central portion  110  and the height H 20  of the surface  420  in the peripheral portion  120  is small. In the present embodiment, relations H 10 =H 20  and HD 0 =0 are assumed. The color filter array  10  includes a pair of color filters  11  and  12  disposed in the peripheral portion  120  with the clearance  1  therebetween and a pair of color filters  13  and  14  disposed in the central portion  110  with the clearance  2  therebetween. The width W 1  of the clearance  1  in the X-direction is larger than the width W 2  of the clearance  2  in the X-direction (W 1 &gt;W 2 ). The line widths of the color filters  13  and  14  in the central portion  110  are formed to be larger than the line widths of the color filters  11  and  12  in the peripheral portion  120 . As a result, the clearance  1  having a large width W 1  is formed in the peripheral portion  120 , and the clearance  2  having a small width W 2  is formed in the central portion  110 . 
       FIG. 8B  illustrates a step corresponding to  FIG. 4B . The thickness of the color filter film  700  formed using a coating method on the base member  400 , which is a foundation having local unevenness due to the color filter array  10 , is influenced by the shape of the color filter array  10 . In other words, the upper surface of the color filter film  700  tends to be lower in height in a wide interval portion of the color filter array  10  than in a narrow interval portion of the color filter array  10 . 
       FIG. 8C  illustrates a step corresponding to  FIG. 4C . The upper surface of the color filter film  700  is lower in the peripheral portion  120  than in the central portion  110 . Therefore, this also applies to the color filters  21  and  22  obtained by patterning the color filter film  700 . In other words, the height H 21  of the upper surface of the color filter  21  positioned in the peripheral portion  120  is lower than the height H 22  of the upper surface of the color filter  22  positioned in the central portion  110  (H 22 &gt;H 21 ). In this embodiment, L 22 =L 21  holds because H 10 =H 20 . For that reason, the thickness T 22  of the color filter  22  is larger than the thickness T 21  of the color filter  21  (T 22 &gt;T 21 ). Let TD 2  be the difference between the thickness T 21  of the color filter  21  and the thickness T 22  of the color filter  22  (TD 2 =T 22 −T 21 ). The difference in thickness, TD 2 , is larger than the difference (L 22 −L 21 ) between the height L 21  of the lower surface of the color filter  21  and the height L 22  of the lower surface of the color filter  22  (TD 2 =T 22 −T 21 &gt;L 22 −L 21 =0). 
     In the image capturing apparatus, light incident from an objective lens has a larger incident angle in the peripheral portion  120  than in the central portion  110  of the MCFA  50 . The large incident angle causes the light incident on the pixels in the peripheral portion  120  to be eclipsed by the wiring lines, making it difficult to converge the light on the photodiodes, decreasing the sensitivity. This causes a sensitivity distribution in the image capturing area, in which the sensitivity is lower in the peripheral portion  120  than the central portion  110 , producing the problem of color shading. Also in such a case, color shading can be reduced by controlling the film thickness distribution of the color filters. In other words, the transmittance of the color filters in the central portion  110  is made higher than the transmittance of the color filters in the peripheral portion  120 . The transmittance of each color filter can be controlled by adjusting the thickness of the color filter, and the thickness of the color filter can be controlled by adjusting the unevenness of the foundation. 
     In other words, the color filter  21  in the peripheral portion  120  is formed to be thinner than the color filter  22  of the central portion  110 . This compensates for the decrease in sensitivity in the peripheral portion  120  due to incident angle characteristics, thereby reducing unevenness in sensitivity distribution. This reduces color shading. Thus, color shading can be reduced when the height of the surface of the base member  400  is substantially equal in the central portion  110  and the peripheral portion  120 . 
     Fourth Embodiment 
     Even if the surface  410  of the base member  400  in the central portion  110  is higher than the surface  420  in the peripheral portion  120  (H 10 &gt;H 20 ), as in the second embodiment, color shading can be reduced as in the third embodiment. In other words, in the case where a decreased in the sensitivity of the peripheral portion  120  due to incident angle characteristics is conspicuous, the thick color filter  21  is disposed in the central portion  110 , and the thin color filter  22  is disposed in the peripheral portion  120 . For that purpose, the color filter array  10  may be formed such that a narrow clearance  1  is disposed in the central portion  110 , and a wide clearance  2  is disposed in the peripheral portion  120 . 
     Fifth Embodiment 
     There is a case where it is desirable to increase the sensitivity in the central portion  110  to be higher than the sensitivity in the peripheral portion  120 . In that case, the thin color filter  22  is disposed in the central portion  110 , and the thick color filter  21  is disposed in the peripheral portion  120 . For that purpose, the color filter array  10  is formed such that a wide clearance  2  is disposed in the central portion  110 , and a narrow clearance  1  is positioned in the peripheral portion  120 . 
     Modification 
     A modification of the methods for making the widths of the clearance  1  and the clearance  2  different in the above embodiments will be described. 
     In this modification, a condition for exposing the color filter film  600  is determined in consideration of the height difference between the surface  410  and the surface  420 . A specific example of the exposure condition is the focus condition of the optical system of an exposure unit. By controlling the focus condition, the line widths of the color filters  11  and  12  and the width of the clearance  1 , and the line widths of the color filters  13  and  14  and the width of the clearance  2  can be made different. As described above, the line widths of the color filters  13  and  14  can be made larger than the line widths of the color filters  11  and  12 . 
       FIG. 5B  is a graph illustrating the relationship between FOCUS value, which is a focus condition at the exposure of the color filter film  600  and the line width of the color filter array  10 . Line P shows the relationship between the FOCUS value of a portion where the surface is low (for example, the central portion  110  in the first embodiment) and the line width of the color filter array  10 . Line Q shows the relationship between the FOCUS value of a portion where the surface is high (for example, the peripheral portion  120  in the first embodiment) and the line width of the color filter array  10 . The line P shows that the focus state is better (best focus value) at FOCUS value S than the focus states at FOCUS values R and T. The line Q shows that the focus state is better (best focus state) at FOCUS value T than the focus states at FOCUS values R and S. 
     For a negative-type color filter film, the larger deviation from the best focus value, the larger the line width of a color filter remaining in an exposed portion, and the smaller is the clearance between the color filters. For that reason, the amount of deviation from the best focus value in a portion where the wide clearance  1  is disposed is made smaller than the amount of deviation from the best focus value in a portion where the narrow clearance  2  is disposed. Thus, adopting the FOCUS value R allows the narrow clearance  2  to be disposed in a portion having a high surface, and the wide clearance  1  to be disposed in a portion having a low surface, as in the first and second embodiments. 
     For a positive-type color filter film, the larger the deviation from the best focus value, the larger is the clearance between color filters formed in an exposed portion. For that reason, the deviation from the best focus value in a portion where the wide clearance  1  is disposed is made larger than the deviation from the best focus value in a portion where the narrow clearance  2  is disposed. Thus, adopting the FOCUS value T shown by the line P allows the narrow clearance  2  to be disposed in a portion with a high surface, and the wide clearance  1  to be disposed in a portion with a low surface, as in the first embodiment and the second embodiment. 
     In this manner, using the deviation from the best focus value (defocus) allows the line width of the color filter and the width of the clearance to be changed even if the line width of the corresponding color filter and the width of the corresponding clearance in the mask pattern of the photomask are equal. 
     Regarding sixth to ninth embodiments of the present disclosure, common matter of the sixth to ninth embodiments will be first described. 
     Common Matters of Sixth to Ninth Embodiments 
       FIG. 10A  is a schematic plan view of the image capturing device IS. The image capturing device IS used as a line sensor of a scanner, in which the MCFA  50  is disposed on the base member  400 . The base member  400  has a surface extending in the X-direction and in the Y-direction crossing (perpendicular to) the X-direction. The thickness and the height indicate a position in the Z-direction crossing (perpendicular to) the X-direction and the Y-direction. 
     The MCFA  50  is constituted by color filter arrays of multiple colors including a color filter array  10 , a color filter array  20 , and a color filter array  30 . An area where the MCFA  50  is disposed serves as an image capturing area in an image capturing device. The color filter arrays  10 ,  20 , and  30  of individual colors each include a plurality of color filters arranged in a one-dimensional pattern or a two-dimensional pattern in the placement area. Each of the plurality of color filters in each of the color filter arrays  10 ,  20 , and  30  corresponds to at least one pixel. The plurality of color filters constituting the color filter arrays  10 ,  20 , and  30  are discontinuously disposed in a certain direction. However, the plurality of color filters constituting the color filter arrays  10 ,  20 , and  30  may be disposed partially continuously at the corners and so on. The plurality of color filters constituting the color filter arrays  10 ,  20 , and  30  are disposed at regular intervals in a certain direction. Arrangement by color may be of a Bayer type, a honeycomb type, or a stripe type, in addition to the arrangement of the present embodiment. 
     The color filter arrays  10 ,  20 , and  30  have different main wavelengths at which visible light is passed through (wavelengths at which the transmittance of visible light is maximum) for each color. For example, the color filter array  10  is formed of color filters (green filters) that mainly transmit green (G). The color filter array  20  is formed of color filters (blue filters) that mainly transmit blue (B). The color filter array  30  is formed of color filters (red filters) that mainly transmit red (R). The MCFA  50  can be formed by combining the color filter arrays  10 ,  20 , and  30 . The combination of colors is not limited to the RGB system but may be a CMY system or a combination thereof. The MCFA  50  may be configured to partially transmit white light (W). In the present embodiment, the color filter array  10  has its main wavelength in a green wavelength range, the color filter array  20  in a blue wavelength range, and the color filter array  30  in a red wavelength range. 
     The color filter array  10  includes color filters  11 ,  12 ,  13 ,  14 , and  15 . The color filter array  20  includes color filters  21 ,  22 ,  23 , and  24 . The color filter  21  is positioned between the color filter  11  and the color filter  12 , and the color filter  22  is positioned between the color filter  11  and the color filter  13 . The color filter array  30  includes color filters  31 ,  32 ,  33 , and  34 . 
     As will be understood from  FIG. 10A , the color filters of the color filter arrays  10 ,  20 , and  30  are arranged in the X-direction and the Y-direction. Four rows of color filters are arranged, with the color filters aligned in the X-direction as one row. R-pixels, G-pixels, and B-pixels are repeatedly arranged in the upper three rows. The color filters  11 ,  12 ,  13 , and  14  are contained in the second row, and the color filter  15  is contained in the first row. 100 to 10,000 columns of color filters are arranged, with the color filters aligned in the Y-direction as one column. Each column contains a R-pixel, a G-pixel, a B-pixel contained in the upper three rows and the G-pixel contained in the lower one row. The pixels in the upper three rows allow forming a color image, and the pixels in the lower one row allow forming a monochrome image. 
       FIG. 10B  illustrates how the color filters are arranged in the Y-direction, and  FIGS. 11A, 11B, and 11C  illustrate how the color filters are arranged in the X-direction.  FIG. 10B  is a cross-sectional view taken along line XB in  FIG. 10A .  FIG. 11A  is a cross-sectional view of the central portion of the image capturing device IS taken along line XIA in  FIG. 10A , and  FIG. 11B  is a cross-sectional view of the peripheral portion of the image capturing device IS taken along line XIB in  FIG. 10A .  FIG. 11C  is a cross-sectional view taken along line XIC in  FIG. 10A . 
     As illustrated in  FIG. 11A , light (indicated by chain lines in  FIG. 11A ) enters in the central portion of the image capturing device IS at an angle substantially perpendicular to the pixels. For that reason, the center of each photoelectric conversion unit  101  and the center of each color filter substantially coincide in the X- and Y-directions. In other words, the center of each photoelectric conversion unit  101  and the center of each color filter overlap in the direction of the normal to the light receiving surface of the photoelectric conversion unit  101  (Z-direction). In contrast, as illustrated in  FIG. 11B , light (indicated by chain lines in  FIG. 11B ) obliquely enters the pixels in the peripheral portion of the image capturing device IS. For that reason, the center of each color filter is shifted in the X-direction with respect to the center of each photoelectric conversion unit  101 . In the present embodiments, pixels in the Y-direction are arranged in only four rows, so that the center of each color filter is not shifted in the Y-direction with respect to the center of each photoelectric conversion unit  101 . However, in the case where 100 to 10,000 rows of pixels are provided in the Y-direction, the center of each color filter is shifted also in the Y-direction with respect to the center of each photoelectric conversion unit  101 . 
     In order to prevent reflection of light and to shield the CMOS circuit of the peripheral circuit of the base member  400  from light, a color filter  29  is disposed in the peripheral area so as to cover the CMOS circuit. The color filter  29  is disposed so as to surround the color filter array  10 . Since a photoelectric conversion unit for generating a signal charge for forming images by receiving light is not provided below the color filter  29 , the color filter  29  is not a color filter constituting a pixel and is not included in the color filter array  20 . 
     In the present embodiments, the color filter  29  is a color filter (blue filter) that mainly transmits blue (B), which is the same color as that of the color filter array  20 .  FIG. 10A  illustrates the boundary between the color filter  29  and other color filters included in the color filter  20  using a dashed line. The color filter  29  may be a green filter or a red filter, and the color filter  12  may not be disposed. 
       FIGS. 10A and 10B  and  FIGS. 11A to 11C  illustrate the widths of representative color filters. Width Wx 11  is the width of the color filter  11  in the X-direction, and width Wy 11  is the width of the color filter  11  in the Y-direction. Width Wx 12  is the width of the color filter  12  in the X-direction, and width Wy 12  is the width of the color filter  12  in the Y-direction. Width Wx 14  is the width of the color filter  14  in the X-direction. 
     The width of the color filter  11  and the width of the color filter  12  differ from each other in at least one of the Y-direction in which the color filter  11  and the color filter  12  are arranged and the X-direction perpendicular to the Y-direction. In other words, the width Wy 12  of the color filter  12  is larger than the width Wy 11  of the color filter  11  in the Y-direction (Wy 11 &lt;Wy 12 ). The width Wx 12  of the color filter  12  is larger than the width Wx 11  of the color filter  11  in the X-direction (Wx 11 &lt;Wx 12 ). The width Wx 12  of the color filter  12  in the X-direction is larger than the width Wy 12  of the color filter  12  in the Y-direction (Wx 12 &gt;Wy 12 ). In the X-direction, the width Wx 12  of the color filter  12  is four times or more the width Wx 11  of the color filter  11  (4×Wx 11 ≤W×12). Color filters  22  and  32  are positioned between the color filter  11  and the color filter  13  aligned in the X-direction. The width Wx 12  of the color filter  12  in the X-direction is larger than the distance between the color filter  11  and the color filter  13 . The width Wx 12  of the color filter  12  in the X-direction is larger than the sum of the width Wx 11  of the color filter  11  in the X-direction and the width Wx 22  of the color filter  22  in the X-direction (Wx 12 &gt;Wx 11 +Wx 22 ). 
     Let Wdxg (Wdxg=Wx 12 −Wx 11 ) be a width distribution, or the difference between the maximum width (Wx 12 ) and the minimum width (Wx 11 ) of the widths of all color filters of the color filter array  10  in the X-direction. Let Wdxb be a width distribution, or the difference between the maximum width and the minimum width of the widths of all color filters in the color filter array  20  in the X-direction. Let Wdxr be a width distribution, or the difference between the maximum width and the minimum width of the widths of all color filters in the color filter array  30  in the X-direction. The width distribution Wdxb and the width distribution Wdxr are smaller than the width distribution Wdxg (Wdxb&lt;Wdxg, Wdxr&lt;Wdxg). 
     Let Wdyg (Wdyg=Wy 12 −Wy 11 ) be a width distribution, or the difference between the maximum width (Wy 12 ) and the minimum width (Wy 11 ) of the widths of all color filters of the color filter array  10  in the Y-direction. Let Wdyb be a width distribution, or the difference between the maximum width and the minimum width of the widths of all color filters in the color filter array  20  in the Y-direction. Let Wdyr be a width distribution, or the difference between the maximum width and the minimum width of the widths of all color filters in the color filter array  30  in the Y-direction. The width distribution Wdyb and the width distribution Wdyr are smaller than the width distribution Wdyg (Wdyb&lt;Wdyg, Wdyr&lt;Wdyg). 
     Thus, variation in the width in the X-direction and/or Y-direction of the color filters included in the color filter array  20  is smaller than variation in the width of the color filters included in the color filter array  10 . Variation in the width in the X-direction and/or Y-direction of the color filters included in the color filter array  30  is smaller than variation in the width of the color filters included in the color filter array  10 . 
     Of all color filters included in the color filter array  10  and excluding the color filter  12 , a color filter positioned at one end in the X-direction (on the left end) is referred to as a left-end color filter. Of all color filters included in the color filter array  10  and excluding the color filter  12 , a color filter positioned at the other end in the X-direction (on the right end) is referred to as a right-end color filters. 
     Between the left-end color filter and the color filter  12  and between the right-end color filter and the color filter  12 , color filters included in the color filter array  20  and/or color filters included in the color filter array  30  are positioned. In other words, color filters of different colors from the color of the color filter  12  are disposed at the left end and right end in the third column adjacent to the color filter  12  of the fourth-column. This allows the shape of the color filter array  10  to be well controlled. 
       FIG. 10B  and  FIGS. 11A to 11C  illustrate the thicknesses of representative color filters. The difference between the thickness T 11  of the color filter  11  and the thickness T 12  of the color filter  12  may be small, or there may be no difference between the thickness T 11  and the thickness T 12  (T 11 =T 12 ). The thickness T 11  is preferably about 92% to 108% of the thickness T 12 . The difference in film thickness between color filters of the same color may be smaller than the difference in film thickness between color filters of different colors. The difference (T 12 −T 11 ) between the thickness T 11  and the thickness T 12  is preferably smaller than the difference (T 21 −T 11 ) between the thickness T 11  and the thickness T 21  (T 12 −T 11 &lt;T 21 −T 11 ). 
     The difference between the thickness T 11  of the color filter  11  and the thickness T 15  (not shown) of the color filter  15  may be small, or there may be no difference between the thickness T 11  and the thickness T 15  (T 11 =T 15 ). The thickness T 11  is preferably about 92% to 108% of the thickness T 15 . The difference (T 15 −T 11 ) between the thickness T 11  and the thickness T 15  is preferably smaller than the difference (T 21 −T 11 ) between the thickness T 11  and the thickness T 21  (T 15 −T 11 &lt;T 21 −T 11 ). 
     Decreasing the difference in thickness between color filter of the same color reduces variations in the sensitivity of pixels having color filters of the same color. This reduces color unevenness of photographed images. In particular, in capturing a color image using the outputs of upper three-rows of pixels, unevenness in the sensitivity of pixels of the same color from column to column causes color shading in the image. For that reason, the difference between the thickness T 11  of the color filter T 11  and the thickness T 15  of the color filter  15  is reduced as much as possible. In particular, the difference (T 15 −T 11 ) between the thickness T 11  and the thickness T 15  is made smaller than the difference (T 12 −T 11 ) between the thickness T 11  and the thickness T 12  (T 15 −T 11 &lt;T 12 −T 11 ). 
     Sixth Embodiment 
     Referring to  FIGS. 12A to 12C ,  FIG. 13A to 13C , and  FIGS. 14A to 14C , the configuration of the MCFA  50  and a method for forming the MCFA  50  will be described.  FIGS. 12A to 12C  are plan views of the MCFA  50 , of which  FIGS. 12A and 12B  illustrate the states in the middle of reaching the state of  FIG. 12C  in the process of forming the MCFA  50 . First, at process G in  FIG. 12A , the color filter array  10  is formed. Next, at process B in  FIG. 12B , the color filter array  20  is formed. Then, at process R in  FIG. 12C , the color filter array  30  is formed. Thus, the color filter array  10  including color filters having different widths is formed prior to the other color filter arrays  20  and  30 . This reduces the difference in the thickness among the color filters  11  to  15  of the same color in the color filter array  10  including the color filter  11  to  15  with different widths. 
       FIGS. 13A to 13C  and  FIGS. 14A to 14C  are respective cross-sectional views of the states of individual steps of the method for manufacturing an electronic device including formation of the MCFA  50 , taken along lines XIII and XIV IN  FIG. 10A . 
       FIG. 12A  illustrates the process G of forming the color filter array  10 .  FIGS. 13A and 13B  illustrate cross-sections of individual steps included in the process G. 
     At step Ga illustrated in  FIG. 13A , the base member  400  formed using a semiconductor process or the like is prepared, and a color filter film  600  is formed on the base member  400  using a coating method. The film thickness of the color filter film  600  is preferably from 800 nm to 1,200 nm. A typical example of the coating method is a spin coating method. Alternatively, a dipping method or a spray method may be used. 
     At step Gb illustrated in  FIG. 13B , the color filter film  600  is patterned by photolithography (exposure and development). The color filter film  600  is exposed to light using an appropriate photomask. Although the color filter film  600  of the present embodiment is a negative-type photosensitive resin, the color filter film  600  may be a positive-type photosensitive resin. The exposed color filter film  600  is developed. The exposed part of the color filter film  600 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  600  remaining after the patterning forms the color filter array  10 . In this case, the color filter  11  has a width Wy 11  (and a width Wx 11 ), and the color filter  12  has a width Wy 12  (and a width Wx 12 ). The width Wy 11  is smaller than the width Wy 12 , and the width Wx 11  is smaller than the width Wx 12 . However, since the color filter film  600  is uniformly formed on the surface of the base member  400  with little unevenness, the difference between the thickness T 11  of the color filter  11  and the thickness T 12  of the color filter  12  can be reduced. 
       FIG. 12B  illustrates the process B of forming the color filter array  20 .  FIG. 13C  and  FIG. 14A  illustrate the states of cross sections of individual steps included in the process B. 
     At step Bc illustrated in  FIG. 13C , a color filter film  700  is formed on the base member  400  so as to cover the color filter array  10  using a coating method. The thickness of the color filter film  600  is preferably about 800 nm to 1,200 nm. A typical example of the coating method is a spin coating method. Alternatively, a dipping method or a spray method may be used. 
     At step Bd illustrated in  FIG. 14A , the color filter film  700  is patterned by photolithography (exposure and development). The color filter film  700  is exposed to light using an appropriate photomask. Although the color filter film  700  is a negative-type photosensitive resin, the color filter film  700  may be a positive-type photosensitive resin. The exposed color filter film  700  is developed. The exposed part of the color filter film  700 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  700  remaining after the patterning forms the color filter array  20 . 
       FIG. 12C  illustrates the process R of forming the color filter array  30 .  FIGS. 14B and 14C  illustrate the states of cross sections of individual steps included in the process R. 
     At step Re illustrated in  FIG. 14B , a color filter film  800  is formed on the base member  400  so as to cover the color filter arrays  10  and  20  using a coating method. The thickness of the color filter film  800  is preferably about 800 nm to 1,200 nm. A typical example of the coating method is a spin coating method. Alternatively, a dipping method or a spray method may be used. 
     At step Rf illustrated in  FIG. 14C , the color filter film  800  is patterned by photolithography (exposure and development). The color filter film  800  is exposed to light using an appropriate photomask. Although the color filter film  800  of the present embodiment is a negative-type photosensitive resin, the color filter film  800  may be a positive-type photosensitive resin. The exposed color filter film  800  is developed. The exposed part of the color filter film  800 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  800  remaining after the patterning forms the color filter array  30 . 
     Comparative Embodiment 
     In a comparative embodiment, the process R of forming the color filter array  30  illustrated in  FIG. 12C  is first performed. Next, the process B of forming the color filter array  20  illustrated in  FIG. 12B  is performed, and then the process G of forming the color filter array  10  illustrated in  FIG. 12A  is performed. In the comparative embodiment, the color filter array  10  including color filters with different widths is formed after the other color filter arrays  20  and  30  are formed. This makes the difference in thickness among the color filters  11  to  15  of the same color of the color filter array  10  including the color filters  11  to  15  with different widths large. 
       FIGS. 15A to 15C  and  FIGS. 16A to 16C  are respective cross-sectional views taken along lines XV and XVI illustrating the states of individual steps of the method of manufacturing the electronic device including formation of the MCFA  50 . 
       FIGS. 15A and 15B  illustrate the states of individual steps included in the process R of forming the color filter array  30 . 
     At step Ra illustrated in  FIG. 15A , the base member  400  formed using a semiconductor process or the like is prepared, and a color filter film  800  is formed on the base member  400  using a coating method. 
     At step Rb illustrated in  FIG. 15B , the color filter film  800  is patterned by photolithography (exposure and development). The color filter film  800  is exposed to light using an appropriate photomask. The exposed color filter film  800  is developed. The exposed part of the color filter film  800 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  800  remaining after the patterning forms the color filter array  30 . 
       FIGS. 15C and 16A  illustrate the states of cross sections of individual steps included in the process B of forming the color filter array  20 . 
     At step Bc illustrated in  FIG. 15C , a color filter film  700  is formed on the base member  400  so as to cover the color filter array  30  using a coating method. 
     At step Bd illustrated in  FIG. 16A , the color filter film  700  is patterned by photolithography (exposure and development). The color filter film  700  is exposed to light using an appropriate photomask. The exposed color filter film  700  is developed. The exposed part of the color filter film  700 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  700  remaining after the patterning forms the color filter array  20 . At that time, a clearance  3  having a width Wy 120  is formed between a color filter  21  in the color filter array  20  and a color filter  31  in the color filter array  30 , and a clearance  4  having a width Wy 110  is formed between the color filter  21  and a color filter  29 . The width Wy 110  of the clearance  4  is smaller than the width Wy 120  of the clearance  3 . 
       FIGS. 16B and 16C  illustrate the states of cross sections of individual steps included in the process G of forming the color filter array  10 . 
     At step Ge illustrated in  FIG. 16B , a color filter film  700  is formed on the base member  400  so as to cover the color filter arrays  20  and  30  using a coating method. The color filter film  600  at that time is larger in the thickness in the clearance  4  between the color filter  21  and the color filter  31  than the thickness in the clearance  3  between the color filter  21  and the color filter  29 . This is because forming a color filter film using a coating method tends to increase the thickness of the color filter film formed in the clearance as the clearance decreases in width. 
     At step Gf illustrated in  FIG. 16C , the color filter film  600  is patterned by photolithography (exposure and development). The color filter film  600  is exposed to light using an appropriate photomask. The exposed color filter film  600  is developed. The exposed part of the color filter film  600 , which is a negative-type photosensitive resin, remains after the development. The part of the color filter film  600  remaining after the patterning forms the color filter array  10 . In detail, the color filter  11  having a width Wy 11  is formed in the clearance  4  having the width Wy 110 , and the color filter  12  having a width Wy 12  is formed in the clearance  3  having the width Wy 120 . As illustrated at step Ge, a difference in film thickness arises between the color filter film  600  in the clearance  3  and the color filter film  600  in the clearance  4 . Therefore, the thickness T 11  of the color filter  11  formed in the clearance  4  is larger than the thickness T 12  of the color filter  12  formed in the clearance  3  (T 12 &lt;T 11 ). 
     Here, the case where the widths of the clearances  3  and  4  and the widths of the color filters  11  and  12  in the Y-direction differ has been described. The above also applies to a case where the widths of the clearances  3  and  4  and the widths of the color filters  11  and  12  in the X-direction differ. 
     In this comparative embodiment, the thickness of the color filter  15  (see  FIG. 10A ) tends to be larger than the thickness of the color filter  11 . A cause of this is that the color filter  15  is positioned far from the color filter  12  than the color filter  11 . Another cause is that the color filter  29  is positioned near to the color filter  15 . In the above description, the thicknesses of the color filter  11  and the color filter  12  are compared. However, the comparative embodiment also tends to have a difference in thickness between the color filter  11  and the color filter  15   r.    
     For that reason, adopting the forming method like the comparative embodiment tends to cause a difference in sensitivity between the pixels having the color filters of the color filter array  10 . For that reason, it is advantageous to form the color filter array  10  prior to the other color filter arrays  20  and  30  in reducing color shading due to a difference in thickness between color filters. 
     Seventh Embodiment 
     In a seventh embodiment, the color filter arrays  10 ,  20 , and  30  are shifted from the photoelectric conversion units  101 , as illustrated in  FIGS. 11A and 11B . As illustrated in  FIG. 11A , the uppermost wiring layer  230  of the multilayer wiring is positioned directly below the boundaries between the color filters in the central portion of the image capturing device IS. In contrast, as illustrated in  FIG. 11B , the wiring layer  230  is not positioned directly below the boundaries between the color filters in the peripheral portion of the image capturing device IS. Thus, the shape of the area of the color filter  11  overlapping with the wiring layer  230  differs from the shape of the area of the color filter  14  overlapping with the wiring layer  230 . In that case, the widths of color filters of the same color can differ depending on whether exposure light is reflected by the wiring layer  230  or the intensity of the exposure light when the color filters of the same color are patterned. Line P in  FIG. 17A  indicates that the widths of the color filters are larger in the peripheral portion of the image capturing device IS than in the central portion. 
       FIGS. 18A and 18B ,  FIGS. 19A and 19B , and  FIGS. 20A and 20B  illustrate a method for forming the MCFA  50  according to the seventh embodiment. 
       FIGS. 18A and 18B  are detailed illustrative drawings of the step Gb illustrated in  FIG. 13B . At the step in  FIG. 18A , a color filter film  600 , which is a negative-type photosensitive material, is applied, and then a latent image of a pattern on a photomask  510  is formed on the color filter film  600  by i-line exposure using the photomask  510 . At the step in  FIG. 18B , an unexposed portion is removed by developing the color filter film  600  to form the color filter array  10 . 
     An opening of the photomask  510  for exposing a portion of the color filter film  600  to be the color filter  11  positioned in the central portion of the image capturing device IS has a width OPga. An opening of the photomask  510  for exposing a portion of the color filter film  600  to be the color filter  14  positioned in the peripheral portion of the image capturing device IS has a width OPgb. The color filter  11  has a width Wga corresponding to the width OPga, and the color filter  14  has a width Wgb corresponding to the width OPgb. 
       FIGS. 19A and 19B  are detailed illustrative drawings of the step Bd illustrated in  FIG. 14A . At the step in  FIG. 19A , a color filter film  700 , which is a negative-type photosensitive material, is applied, and then a latent image of a pattern on a photomask  520  is formed on the color filter film  700  by i-line exposure using the photomask  520 . At the step in  FIG. 19B , an unexposed portion is removed by developing the color filter film  700  to form the color filter array  20 . 
     An opening of the photomask  520  for exposing a portion of the color filter film  700  to be the color filter  22  positioned in the central portion of the image capturing device IS has a width OPba. An opening of the photomask  520  for exposing a portion of the color filter film  700  to be the color filter  23  positioned in the peripheral portion of the image capturing device IS has a width OPbb. The color filter  22  has a width Wba corresponding to the width OPba, and the color filter  23  has a width Wbb corresponding to the width OPbb. 
       FIGS. 20A and 20B  are detailed illustrative drawings of the step Rf illustrated in  FIG. 14C . At the step in  FIG. 20A , a color filter film  800 , which is a negative-type photosensitive material, is applied, and then a latent image of a pattern on a photomask  530  is formed on the color filter film  800  by i-line exposure using the photomask  530 . At the step in  FIG. 20B , an unexposed portion is removed by developing the color filter film  800  to form the color filter array  30 . 
     An opening of the photomask  530  for exposing a portion of the color filter film  800  to be the color filter  32  positioned in the central portion of the image capturing device IS has a width OPra. An opening of the photomask  530  for exposing a portion of the color filter film  800  to be the color filter  34  positioned in the peripheral portion of the image capturing device IS has a width OPrb. The color filter  32  has a width Wra corresponding to the width OPra, and the color filter  34  has a width Wrb corresponding to the width OPrb. 
     A photomask  500  illustrated in  FIG. 17B  corresponds to the photomask  510  for forming the color filter array  10 . An opening OPXL is an opening for forming the color filter  12  in the sixth embodiment. Openings OPL are openings for forming all color filters included in the color filter array  10  and excluding the color filter  12 . As illustrated in  FIG. 17B , the seventh embodiment uses the photomask  500  designed such that the openings other than the opening OPXL having a large opening width have he same width OPL. Therefore, the widths of the openings have the relations OPga=OPgb, OPba=OPbb, and OPra=OPrb. However, the widths of the color filters acquired by development have the relations, Wga&lt;Wgb, Wba&lt;Wbb, and Wra&lt;Wrb. The relations, Wga&lt;Wgb, Wba&lt;Wbb, and Wra&lt;Wrb, are within the range of Wdxb&lt;Wdxg, Wdxr&lt;Wdxg, Wdyb&lt;Wdyg, and Wdyr&lt;Wdyg, described in the sixth embodiment. 
     The following describes this. Although the photomask  500  in  FIG. 17B  is an example of application to the photomask  510 , application to the photomask  520  or  530  is also possible. 
     As illustrated in  FIG. 18A , reflection of exposure light is prevented in the central portion in which the wiring layer  230  is present below the boundary of the color filters by barrier metal that constitutes the upper surface of the wiring layer  230 . 
     The wiring layer  230  is constructed such that titanium nitride (TiN) serving as barrier metal is disposed on aluminum, so that the upper surface of the wiring layer  230  is constituted of the barrier metal. The barrier metal absorbs ultraviolet rays (i-line), which is exposure light, so that reflection of the exposure light by the wiring layer  230  is reduced. For example, the i-line reflectance of titanium nitride is 20% to 30%, and the i-line reflectance of silicon is 50% to 70%. Therefore, halation at the exposure of the color filter film, which can be generated by reflection of the exposure light, is reduced in the central portion where the wiring layer  230  is present below the boundary of the color filters. In contrast, in the peripheral portion where the wiring layer  230  is not present (or with less wiring layer  230 ) below the boundary of the color filters, reflection of the exposure light using the barrier metal constituting the upper surface of the wiring layer  230  is not prevented (or the degree of antireflection decreases). For that reason, the exposure light is reflected by the surface of the semiconductor substrate  100 , and the color filter film is excessively exposed to the reflected light at the end, causing halation. As a result, when the negative-type color filter film is developed, the width of the color filter increases in the peripheral portion where the degree of halation is large. If a positive-type photosensitive material is used as the color filter film, the width of the color filter decreases with a decreasing distance to the peripheral portion where the degree of halation is large. In contrast, in the case where the upper surface of the wiring layer  230  has higher reflectance of exposure light than the reflectance of the semiconductor substrate  100 , the degree of halation increases with an decreasing distance to the central portion where the end of the color filter overlaps with the wiring layer  230 . Thus, when the positional relationship between the wiring layer  230  and the end of the color filter differ between the central portion and the peripheral portion of the image capturing device IS, the widths of the color filters vary depending on how halation occurs. A color filter array including color filters having different widths is formed first, as described in the sixth embodiment. Therefore, even if the positional relationship between the color filter array  10  formed first and the wiring layer  230  differ in position in the image capturing device IS (the central portion and the peripheral portion), the MCFA  50  in which generation of color shading is reduced can be obtained. 
     Eighth Embodiment 
     As illustrated in  FIG. 17C , an eighth embodiment uses a photomask  500  designed such that the openings of the pattern other than the opening OPXL with a large opening width have a width OPL in the central portion, a width OPS in the peripheral portion, and a width OPM in an intermediate portion between the central portion and the peripheral portion. Therefore, the widths of the openings have the relations OPga&gt;OPgb, OPba&gt;OPbb, and OPra&gt;OPrb. Thus, the photomask  500  includes an opening having the width OPga for exposing a portion to be the color filter  11  of the color filter film  600  and an opening having the width OPgb to form the color filter  14  of the color filter film  600 . The width OPga and the width OPgb differ from each other in a direction in which the opening having the width OPga and the opening having the width OPgb are arranged (corresponding to the X-direction). This compensates for the influence of the halation and achieves the relationship between the widths of the color filters acquired by development, Wga=Wgb, Wba=Wbb, and Wra=Wrb, or relationships close thereto. 
       FIG. 17C  is a schematic diagram of a photomask for forming a color filter array illustrating a state in which openings for forming the color filter array are disposed over the entire photomask.  FIG. 17C  illustrates a method for reducing variations in line width due to a difference in reflectance, illustrated in  FIG. 17A .  FIG. 17C  illustrates correction for compensating changes in the size of the patterned color filter array from the openings on the photomask  500  corresponding to the color filter array over the entire surface of the photomask  500 . The correction of the photomask  500  is performed according to an increase in line width so that the size of the color filter array during patterning becomes uniform. In  FIG. 17C , the correction is performed so that the size of the color filter array on the photomask  510  decreases from the pixel center portion to the pixel peripheral portion. Although the correction is described in  FIG. 17C  using the photomask  510  as an example, this also applies to correction of the photomasks  520  and  530 . Thus, adjusting the size of the array on the photomask  500  according to reflectance directly below the array reduces changes in the size of the array in the pixels, which come rise in an electronic device with a shrink structure. 
     Ninth Embodiment 
     In a ninth embodiment, the base member  400  can be configured to have a light-absorbing film between the wiring layer  230  and the color filter films  600 ,  700 , and  800  in order to reduce the halation itself, described above. The light absorbing film is a film with an absorption rate of 10% or more for exposure light (for example, i-line) for use in patterning the color filter films  600 ,  700 , and  800 . In this embodiment, the planarizing film  320  is used as the light absorbing film. The i-line absorption rate of a general resin planarizing film is 2% to 3%. The exposure-light absorption rate is preferably 20% or more. However, extremely increasing the absorption rate of the light absorbing film at an exposure wavelength increases a visible-light absorption rate, possibly decreasing the sensitivity. For that reason, the exposure-light absorption rate may be 60% or less. Since exposure light that has passed through a light absorbing film is absorbed again by the light absorbing film even if it is reflected by the semiconductor substrate  100 , an absorption rate of 20% or more gives a sufficient effect. Thus, disposing a light absorbing film with an absorption rate of 10% or more above the wiring layer  230  reduces differences in the degree of halation due to a difference in positional relationship between the wiring layer  230  and the color filter film. 
     The eighth embodiment and the ninth embodiment show that the difference in the widths of the color filters between the central portion and the peripheral portion of the image capturing device IS due to halation during exposure can be reduced, as indicated by line Q in  FIG. 17A . 
     The above embodiments provide techniques useful in reducing color shading. The above embodiments can be modified as appropriate without departing from the spirit of the present disclosure. The first to ninth embodiments may also be combined as appropriate. 
     While the present disclosure has been described with reference to exemplary embodiments, it is to be understood that the present disclosure is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.