Patent Publication Number: US-2023165104-A1

Title: Color conversion substrate and display device including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims priority to and the benefit of Korean Patent Application No. 10-2021-0163707, filed on Nov. 24, 2021, the entirety of which is hereby incorporated by reference for all purposes as if fully set forth herein. 
     BACKGROUND 
     1. Field 
     Aspects of some embodiments relate to a color conversion substrate. 
     2. Description Of The Related Art 
     A flat panel display may be used as a display device, as a substitute for alternative display devices such as cathode ray display devices, due to characteristics such as being relatively light weight and thin. Representative examples of such flat panel display devices include liquid crystal devices (LCD devices) and organic light emitting display devices (OLED devices). 
     Recently, organic light emitting display devices, which include organic light emitting elements and a color conversion layer has been studied. The color conversion layer may convert a wavelength of light provided from the organic light emitting element. Accordingly, the organic light emitting display device may emit light having a color different from a color of an incident light. 
     The above information disclosed in this Background section is only for enhancement of understanding of the background and therefore the information discussed in this Background section does not necessarily constitute prior art. 
     SUMMARY 
     Aspects of some embodiments relate to a color conversion substrate. For example, aspects of some embodiments relate to a color conversion substrate and a display device including the same. 
     Aspects of some embodiments include a color conversion substrate that may reduce manufacturing costs. 
     Aspects of some embodiments include a display device including the color conversion substrate. 
     A color conversion substrate according to some embodiments of the present invention may include a substrate including first, second, and third light emitting areas, and a light blocking area surrounding the first, second, and third light emitting area, a first color filter layer under the substrate, overlapping the first light emitting area, and having a first opening and a second opening exposing a portion of the substrate, respectively, a second color filter layer under the substrate and the first color filter layer, overlapping the second light emitting area, and having a third opening exposing a portion of the substrate and a fourth opening exposing a portion of the first color filter layer, a third color filter layer under the substrate and the second color filter layer, overlapping the third light emitting area, and having a fifth opening exposing a portion of the second color filter layer and a sixth opening exposing a portion of the first color filter layer, and a color conversion layer overlapping the first, second, and third color filter layers under the first, second, and third color filter layers and including a color conversion particle. A first shortest distance from an end of the first opening to an end of the fifth opening may be different from a second shortest distance from an end of the fourth opening to an end of the sixth opening in a plan view. 
     According to some embodiments, the second shortest distance may be greater than the first shortest distance. 
     According to some embodiments, the first color filter layer, the second color filter layer, and the third color filter layer may partially overlap with each other in the light blocking area. 
     According to some embodiments, the first color filter layer, the second color filter layer, and the third color filter layer may transmit light of different colors with each other. 
     According to some embodiments, the first color filter layer may transmit blue light, the second color filter layer may transmit red light, and the third color filter layer may transmit green light. 
     According to some embodiments, the first opening may correspond to the second light emitting area, the second opening may correspond to the third light emitting area, and the fourth opening may correspond to the first light emitting area. 
     According to some embodiments, a portion of the third opening may overlap the third emitting area, a portion of the fifth opening may overlap the second emitting area, and a portion of the sixth opening may overlap the first emitting area. 
     According to some embodiments, a width of the first opening may be smaller than a width of the fifth opening, a width of the second opening may be smaller than a width of the third opening, and a width of the fourth opening may be smaller than a width of the sixth opening. 
     According to some embodiments, the first color filter layer may include a portion overlapping the first light emitting area and a portion overlapping the light blocking area. The second color filter layer may include a portion overlapping the second light emitting area and a portion overlapping a portion of the light blocking area. The third color filter layer may include a portion overlapping the third light emitting area and a portion overlapping a portion of the light blocking area. 
     According to some embodiments, the color conversion layer may include a first color conversion layer partially overlapping the second light emitting area, a second color conversion layer partially overlapping the third light emitting area, and a transmission layer partially overlapping the first light emitting area. 
     A color conversion substrate according to some embodiments of the present invention may include a substrate including first, second, and third light emitting areas, and a light blocking area surrounding the first, second, and third light emitting area, a first color filter layer under the substrate, overlapping the first light emitting area, and having a first opening exposing a portion of the substrate, a second color filter layer under the substrate and the first color filter layer, overlapping the second light emitting area, and having a second opening exposing a portion of the first color filter layer, and a third color filter layer under the substrate and the second color filter layer, overlapping the first light emitting area, and having a third opening exposing a portion of the second color filter layer and a fourth opening exposing a portion of the first color filter layer. A first shortest distance from an end of the first opening to an end of the third opening may be different from a second shortest distance from an end of the second opening to an end of the fourth opening in a plan view. 
     According to some embodiments, the second shortest distance may be greater than the first shortest distance. 
     According to some embodiments, the color conversion substrate may further include a color conversion layer overlapping the first, second, and third color filter layers under the first, second, and third color filter layers and including a color conversion particle. 
     According to some embodiments, a width of the first opening may be smaller than a width of the third opening and a width of the second opening may be smaller than a width of the fourth opening. 
     A display device according to some embodiments of the present invention may include an array substrate including a first substrate and a light emitting element on the first substrate, and a color conversion substrate on the array substrate and converting a wavelength of light emitted from the light emitting element. The color conversion substrate may include: a second substrate including first, second, and third light emitting areas, and a light blocking area surrounding the first, second, and third light emitting area, a first color filter layer under the second substrate, overlapping the first light emitting area, and having a first opening and a second opening exposing a portion of the second substrate, respectively, a second color filter layer under the second substrate and the first color filter layer, overlapping the second light emitting area, and having a third opening exposing a portion of the second substrate and a fourth opening exposing a portion of the first color filter layer, a third color filter layer under the second substrate and the second color filter layer, overlapping the third light emitting area, and having a fifth opening exposing a portion of the second color filter layer and a sixth opening exposing a portion of the first color filter layer, and a color conversion layer overlapping the first, second, and third color filter layers under the first, second, and third color filter layers and including a color conversion particle. A first shortest distance from an end of the first opening to an end of the fifth opening may be different from a second shortest distance from an end of the fourth opening to an end of the sixth opening in a plan view. 
     According to some embodiments, the second shortest distance may be greater than the first shortest distance. 
     According to some embodiments, a stacked portion in which the first color filter layer, the second color filter layer, and the third color filter layer are overlapped in the light blocking area may be defined as a light blocking layer. 
     According to some embodiments, the first color filter layer, the second color filter layer, and the third color filter layer may transmit light of different colors with each other. 
     According to some embodiments, the first opening may correspond to the second light emitting area, the second opening may correspond to the third light emitting area, and the fourth opening may correspond to the first light emitting area. 
     According to some embodiments, a portion of the third opening may overlap the third emitting area, a portion of the fifth opening may overlap the second emitting area, and a portion of the sixth opening may overlap the first emitting area. 
     According to some embodiments, the first color filter layer may include a portion overlapping the first light emitting area and a portion overlapping the light blocking area. The second color filter layer may include a portion overlapping the second light emitting area and a portion overlapping a portion of the light blocking area. The third color filter layer may include a portion overlapping the third light emitting area and a portion overlapping a portion of the light blocking area. 
     According to some embodiments, the light emitting element may emit light including blue light. 
     In a color conversion substrate and a display device including the same according to some embodiments of the present invention, a first color filter layer, a second color filter layer, and a third color filter layer that transmit light of different colors with each other may be sequentially arranged under a substrate. The first color filter layer may define a second light emitting area emitting red light and a third light emitting area emitting green light, and the third color filter layer may define a first light emitting area emitting blue light. In addition, a stacked portion in which the first, second, and third color filter layers are overlapped in the light blocking area may function as a light blocking layer. Accordingly, a manufacturing cost of the display device may be reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Illustrative, non-limiting embodiments will be more clearly understood from the following detailed description in conjunction with the accompanying drawings. 
         FIG.  1    is a perspective view illustrating a display device according to some embodiments. 
         FIG.  2    is a cross-sectional view taken along the line I-I′ of  FIG.  1   . 
         FIG.  3    is a plan view illustrating the display device of  FIGS.  1  and  2   . 
         FIG.  4    is a cross-sectional view of the display device of  FIGS.  1  and  2    taken along the line II-II′ of  FIG.  3   . 
         FIGS.  5  and  6    are cross-sectional views of the color conversion substrate of  FIGS.  1  and  2    taken along the line III-III′ of  FIG.  3   . 
         FIGS.  7 ,  8 ,  9 ,  10 ,  11 ,  12 ,  13  and  14    are views illustrating a method of manufacturing the color conversion substrate of  FIGS.  5  and  6   . 
         FIGS.  15 ,  16 ,  17 ,  18 ,  19 ,  20 , and  21    are cross-sectional views illustrating color conversion substrates according to other embodiments. 
         FIG.  22    is a cross-sectional view illustrating a display device according to some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be explained in detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components will be omitted. 
       FIG.  1    is a perspective view illustrating a display device according to some embodiments.  FIG.  2    is a cross-sectional view taken along the line I-I′ of  FIG.  1   . 
     Referring to  FIGS.  1  and  2   , the display device  1000  according to some embodiments of the present invention may include an array substrate  100 , a sealing portion  350 , a filling layer  300 , and a color conversion substrate  200 . 
     The display device  1000  may have a rectangular planar shape. For example, the display device  1000  may include two first sides extending in a first direction D1 and two second sides extending in a second direction D2 perpendicular to the first direction D1. An edge where the first side and the second side meet may be a right angle. According to some embodiments, an edge where the first side and the second side of the display device  1000  meet may form a curved surface. Additionally, although the display device  1000  is illustrated and described as being rectangular in a plan view (e.g. a direction perpendicular or normal with respect to a plane of the display surface), in some embodiments, the display device  1000  may have any other suitable polygon shape in a plan view, or may have, for example, rounded corners, or curved edges. 
     The display device  1000  may be divided into a display area DA and a non-display area NDA. The display area DA may display images, and the non-display area NDA may not display an image. The non-display area NDA may be located around the display area DA. For example, the non-display area NDA may surround the display area DA. That is, the non-display area NDA may not have any pixels and may be for example, a bezel area. 
     The array substrate  100  may include a pixel array. Each pixel of the pixel array may include a light emitting element that generates light according to a driving signal. 
     The color conversion substrate  200  may be located on the array substrate  100 . The color conversion substrate  200  may face the array substrate  100 . The color conversion substrate  200  may include a color conversion layer that converts the wavelength of the light emitted from the light emitting element. In addition, the color conversion substrate  200  may include a color filter that transmits light having a specific color. A detailed description of the color conversion substrate  200  will be described later. 
     The sealing portion  350  may be located between the array substrate  100  and the color conversion substrate  200  in the non-display area NDA. The sealing portion  350  may be arranged along edges of the array substrate  100  and the color conversion substrate  200  in the non-display area NDA to surround the display area DA in a plan view. In addition, the array substrate  100  and the color conversion substrate  200  may be coupled to each other through the sealing portion  350 . The sealing portion  350  may include an organic material. For example, the sealing portion  350  may include an epoxy-based resin and the like. 
     The filling layer  300  may be located between the array substrate  100  and the color conversion substrate  200 . The filling layer  300  may fill a space between the array substrate  100  and the color conversion substrate  200 . The filling layer  300  may include a material capable of transmitting light. For example, the filling layer  300  may include an organic material. Examples of the material that can be used for the filling layer  300  may include a silicone-based resin, an epoxy-based resin, and the like. These may be used alone or in combination with each other. According to some embodiments, the filling layer  300  may be omitted. 
     However, although the display device  1000  of the present invention is illustrated as being an organic light emitting display device (OLED), the configuration of embodiments according to the present invention is not limited thereto. In other embodiments, the display device  1000  may include a liquid crystal display device (LCD), a field emission display device (FED), a plasma display device (PDP), an electrophoretic display device (EPD), a quantum dot display device, or an inorganic light emitting display device. Hereinafter, an example in which the display device  1000  according to the present invention includes the organic light emitting display device will be described. 
       FIG.  3    is a plan view illustrating the display device of  FIGS.  1  and  2   . 
     Referring to  FIG.  3   , the display area DA of the display device  1000  according to some embodiments may include light emitting areas LA and a light blocking area BA. Here, each of the light emitting areas LA may include a first light emitting area LA 1 , a second light emitting area LA 2 , and a third light emitting area LA 3 . 
     Each of the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3  may be an area in which light emitted from the light emitting element is emitted to an outside of the display device  1000 . For example, the first light emitting area LA 1  may emit a first light, the second light emitting area LA 2  may emit a second light, and the third light emitting area LA 3  may emit a third light. According to some embodiments, the first light may be blue light, the second light may be red light, and the third light may be green light. However, embodiments according to the present invention are not limited thereto. For example, the light emitting areas LA may be combined to emit yellow, cyan, and magenta lights. 
     In addition, the light emitting areas LA may emit light of four or more colors. For example, the light emitting areas LA may be combined to further emit at least one of yellow, cyan, or magenta lights in addition to red, green, and blue lights. In addition, the light emitting areas LA may be combined to further emit white light. 
     In a plan view, each of the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3  may be repeatedly arranged along a row direction and a column direction. For example, in the plan view, each of the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3  may be repeatedly arranged along the first direction D1 and the second direction perpendicular to the first direction D1. According to some embodiments, in the plan view, the second light emitting area LA 2  and the first light emitting area LA 1  may be repeatedly arranged in a first row of the display area DA, and the third light emitting area LA 3  may be repeatedly arranged in a second row of the display area DA. 
     The first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3  may have different sizes. According to some embodiments, an area of the second light emitting area LA 2  emitting red light may be larger than an area of each of the first light emitting area LA 1  emitting blue light and the third light emitting area LA 3  emitting green light. In this case, the area of the third light emitting area LA 3  may be larger than the area of the first light emitting area LA 1 . According to some embodiments, the area of the third light emitting area LA 3  emitting green light may be larger than the area of each of the first light emitting area LA 1  emitting blue light and the second light emitting area LA 2  emitting red light. In this case, the area of the second light emitting area LA 2  may be larger than the area of the first light emitting area LA 1 . 
     Each of the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3  has a triangular planar shape, a rectangular planar shape, a circular planar shape, a track-type planar shape, an elliptical planar shape, or the like. According to some embodiments, each of the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3  may have a rectangular planar shape. 
     The light blocking area BA may be located between the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3 . For example, in the plan view, the light blocking area BA may surround the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3 . The light blocking area BA may not emit light. 
       FIG.  4    is a cross-sectional view of the display device of  FIGS.  1  and  2    taken along the line II-II′ of  FIG.  3   .  FIGS.  5  and  6    are cross-sectional views of the color conversion substrate of  FIGS.  1  and  2    taken along the line III-III′ of  FIG.  3   . 
     Referring to  FIG.  4   , as described above, the display device  1000  according to some embodiments includes the array substrate  100 , the sealing portion  350 , the filling layer  300 , and the color conversion substrate  200 . First, the array substrate  100  will be described. 
     The array substrate  100  may include a first substrate  110 , a driving element  120 , an insulating structure  130 , a pixel defining layer  140 , a light emitting element  150 , and an encapsulation structure  160 . 
     The first substrate  110  may include a transparent material or an opaque material. The first substrate  110  may be formed of a transparent resin substrate. An example of the transparent resin substrate that can be used as the first substrate  110  may include a polyimide substrate. In this case, the polyimide substrate may include a first organic layer, a first barrier layer, a second organic layer, and the like. According to some embodiments, the first substrate  110  may include a quartz substrate, a synthetic quartz substrate, a calcium fluoride substrate, a fluorine-doped quartz substrate, a soda-lime glass substrate, an alkali-free glass substrate, and the like. These may be used alone or in combination with each other. 
     The driving element  120  may be located on the first substrate  110 . The driving element  120  may be electrically connected to the light emitting element  150 . According to some embodiments, the driving element  120  may include a thin film transistor. For example, an active pattern of the driving element  120  may include amorphous silicon, polycrystalline silicon, or a metal oxide semiconductor. 
     For example, the metal oxide semiconductor may include a binary compound (AB x ), a ternary compound (AB x C y ), a quaternary compound (AB x C y D z ), and the like containing indium (In), zinc (Zn), gallium (Ga), tin (Sn), titanium (Ti), aluminum (Al), hafnium (Hf), zirconium (Zr), magnesium (Mg), and the like. For example, the metal oxide semiconductor may include zinc oxide (ZnO x ), gallium oxide (GaO x ), tin oxide (SnO x ), indium oxide (InO x ), indium gallium oxide (IGO), indium zinc oxide (IZO), and indium tin oxide. (ITO), indium zinc tin oxide (IZTO), indium gallium zinc oxide (IGZO), and the like. These may be used alone or in combination with each other. 
     The insulating structure  130  may be located on the first substrate  110 . The insulating structure  130  may cover the driving element  120 . The insulating structure  130  may include a combination of at least one inorganic insulating layer and at least one organic insulating layer. For example, the inorganic insulating layer may include silicon oxide, silicon nitride, silicon carbide, silicon oxynitride, silicon oxycarbide, and the like. The organic insulating layer may include photoresist, polyacryl-based resin, polyimide-based resin, polyamide-based resin, siloxane-based resin, acryl-based resin, epoxy-based resin and the like. Each of these may be used alone or in combination with each other. 
     The first electrode  151  may be located in each of the light emitting areas LA 1 , LA 2 , and LA 3  on the insulating structure  130 . The first electrode  151  may be electrically connected to the driving element  120  through a contact hole formed by removing a portion of the insulating structure  130 . The first electrode  151  may include a metal, an alloy, a metal nitride, a conductive metal oxide, a transparent conductive material, and the like. These may be used alone or in combination with each other. For example, the first electrode  151  may act as an anode. 
     The pixel defining layer  140  may be located in the light blocking area BA on the insulating structure  130  and the first electrode  151 . The pixel defining layer  140  may cover both sides of the first electrode  151  and expose a portion of an upper surface of the first electrode  151 . The pixel defining layer  140  may include an organic material or an inorganic material. Examples of the organic material that can be used for the pixel defining layer  140  may include photoresist, polyacrylic resin, polyimide-based resin, polyamide-based resin, siloxane-based resin, acrylic-based resin, epoxy-based resin, and the like. These may be used alone or in combination with each other. 
     The light emitting layer  152  may be located on the first electrode  151 . A hole provided from the first electrode  151  and an electron provided from the second electrode  153  combine in the light emitting layer  152  to form an exciton, and as the exciton changes from an excited state to a ground state, the light emitting layer  152  may emit light. For example, the light emitting layer  152  may emit at least one of red light, green light, or blue light. According to some embodiments, the light emitting layer  152  may emit blue light L1. 
     The second electrode  153  may be located on the light emitting layer  152  and the pixel defining layer  140 . The second electrode  153  may include a metal, an alloy, a metal nitride, a conductive metal oxide, a transparent conductive material, and the like. These may be used alone or in combination with each other. For example, the second electrode  153  may act as a cathode. 
     Accordingly, the light emitting element  150  including the first electrode  151 , the light emitting layer  152 , and the second electrode  153  may be located on the first substrate  110 . The light emitting element  150  may be located in each of the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3 . The light emitting element  150  may provide light to the color conversion substrate  200 . According to some embodiments, the light emitting element  150  may include a blue light emitting element emitting blue light L1. 
     The encapsulation structure  160  may be located on the second electrode  153 . The encapsulation structure  160  may prevent or reduce instances of impurities, moisture, or other contaminants penetrating into the light emitting element  150  from the outside. The encapsulation structure  160  may include at least one inorganic encapsulation layer and at least one organic encapsulation layer. For example, the inorganic encapsulation layer may include silicon oxide, silicon nitride, silicon oxynitride, and the like, and the organic encapsulation layer may include a cured polymer such as polyacrylate, and the like. 
     The filling layer  300  may be located between the color conversion substrate  200  and the array substrate  100 . The filling layer  300  may include a material capable of transmitting light. The filling layer  300  may be formed to maintain a filling gap between the color conversion substrate  200  and the array substrate  100 . For example, the filling layer  300  may include an organic material. According to some embodiments, the filling layer  300  may be omitted. 
     Hereinafter, the color conversion substrate  200  will be described. 
     Referring to  FIGS.  4 ,  5  and  6   , the color conversion substrate  200  according to some embodiments of the present invention may include a second substrate  210 , a color filter layer  220 , a low refractive index layer  230 , a first protection layer  241 , a color conversion layer  260 , a bank structure  250 , and a second protection layer  242 . 
     The color conversion substrate  200  may be located on the array substrate  100 . The color conversion substrate  200  and the array substrate  100  may be combined. 
     As described above, the display area DA of the display device  1000  may include the first, second, and third light emitting areas LA 1 , LA 2 , and LA 3  and the light blocking area BA. Accordingly, the second substrate  210  may also include the first, second, and third light emitting areas LA 1 , LA 2 , and LA 3  and the light blocking area BA. 
     The second substrate  210  may transmit light emitted from the light emitting element  150 . For example, the second substrate  210  may be formed of a transparent resin substrate. The second substrate  210  may include an insulating material such as glass or plastic. Alternatively, the second substrate  210  may include an organic polymer material such as polycarbonate, polyethylene, polypropylene, and the like. 
     The color filter layer  220  may be located under the second substrate  210 . The color filter layer  220  may selectively transmit light having a specific wavelength. 
     According to some embodiments, the color filter layer  220  may include a first color filter layer  221 , a second color filter layer  222 , and a third color filter layer  223 . The colors of the light Lr, Lg, and Lb emitted from the first light emitting area LA 1 , the second light emitting area LA 2 , and the third light emitting area LA 3  may be determined by the first color filter layer  221 , the second color filter layer  222  and the third color filter layer  223 . 
     The first color filter layer  221 , the second color filter layer  222 , and the third color filter layer  223  may transmit light of different colors with each other. According to some embodiments, the first color filter layer  221  may overlap the first light emitting area LA 1 . For example, the first color filter layer  221  may transmit blue light Lb. The second color filter layer  222  may overlap the second light emitting area LA 2 . For example, the second color filter layer  222  may transmit red light Lr. The third color filter layer  223  may overlap the third light emitting area LA 3 . For example, the third color filter layer  223  may transmit green light Lg. 
     The first color filter layer  221  may include a first transmitting portion overlapping the first light emitting area LA 1  and a first light blocking portion overlapping the light blocking area BA. According to some embodiments, the first light blocking portion of the first color filter layer  221  may be entirely located in the light blocking area BA. 
     The second color filter layer  222  may include a second transmitting portion overlapping the second light emitting area LA 2  and a second light blocking portion overlapping a portion of the light blocking area BA. In addition, the third color filter layer  223  may include a third transmitting portion overlapping the third light emitting area LA 3  and a third light blocking portion overlapping a portion of the light blocking area BA. 
     According to some embodiments, the first color filter layer  221 , the second color filter layer  222 , and the third color filter layer  223  may partially overlap with each other in the light blocking area BA. 
     The first color filter layer  221  may have a first opening  221   a  and a second opening  221   b . The second color filter layer  222  may have a third opening  222   a  and a fourth opening  222   b . The third color filter layer  223  may have a fifth opening  223   a  and a sixth opening  223   b . 
     According to some embodiments, each of the first opening  221   a  and the second opening  221   b  may expose a portion of the second substrate  210 . In addition, the third opening  222   a  may expose a portion of the second substrate  210  and the fourth opening  222   b  may expose a portion of the first color filter layer  221 . In addition, the fifth opening  223   a  may expose a portion of the second color filter layer  222  and the sixth opening  223   b  may expose a portion of the first color filter layer  221 . 
     A portion of the third opening  222   a  may overlap the third light emitting area LA 3 , a portion of the fifth opening  223   a  may overlap the second light emitting area LA 2 , and a portion of the sixth opening  223   b  may overlap the first light emitting area LA 1 . 
     According to some embodiments, the first opening  221   a  may correspond to the second light emitting area LA 2 , the second opening  221   b  may correspond to the third light emitting area LA 3 , and the fourth opening  222   b  may correspond to the first light emitting area LA 1 . Accordingly, the first color filter layer  221  may define the second light emitting area LA 2  and the third light emitting area LA 3 , respectively, and the second color filter layer  222  may define the first light emitting area LA 1 . 
     As a width of each of the first opening  221   a  and the fifth opening  223   a  varies, an opening ratio of the first opening  221   a  may change. In addition, as a width of each of the fourth opening  222   b  and the sixth opening  223   b  varies, an opening ratio of the fourth opening  222   b  may change. 
     Hereinafter, a luminous efficiency of the light emitting areas LA 1 , LA 2 , and LA 3  as an opening ratio of each of the first opening  221   a  and the fourth opening  222   b  are changed was evaluated. 
     As a result, when the width of each of the first opening  221   a  and the fifth opening  223   a  is changed and the opening ratio of the first opening  221   a  is changed by about 1%, luminous efficiency of the second light emitting area LA 2  was changed by about 0.67%. In addition, when the width of each of the fourth and sixth openings  222   b  and  223   b  is changed and the opening ratio of the fourth opening  222   b  is changed by about 1%, luminous efficiency of the first light emitting area LA 1  was changed by about 0.36%. Through this, that when the opening ratio of an opening corresponding to a light emitting area is changed, luminous efficiency of the light emitting area is reduced may be confirmed. 
     Accordingly, in order to prevent reduction in luminous efficiency of the light emitting areas LA 1 , LA 2 , and LA 3 , the width of the first opening  221   a  may be smaller than the width of the fifth opening  223   a  and the width of the second opening  221   b  may be smaller than the width of the third opening  222   a . In addition, the width of the fourth opening  222   b  may be smaller than the width of the sixth opening  223   b . 
     In addition, in the plan view, a first shortest distance d1 from an end of the first opening  221   a  to an end of the fifth opening  223   a  may be different from a second shortest distance d2 from an end of the fourth opening  222   b  to an end of the sixth opening  223   b . According to some embodiments, in the plan view, the second shortest distance d2 may be greater than the first shortest distance d1. For example, the first shortest distance d1 may be about 4.9 µm and the second shortest distance d2 may be about 5.5 µm. 
     Hereinafter, numerical value of each of the first shortest distance d1 and the second shortest distance d2 will be described. 
     The first shortest distance d1 may be determined in consideration of the width of the first opening  221   a , the width of the fifth opening  223   a , and an overlay deviation between an end of the first opening  221  and an end of the fifth opening  223   a . 
     The second shortest distance d2 may be determined in consideration of the width of the fourth opening  222   b , the width of the sixth opening  223   b , an overlay deviation between an end of the first color filter layer  221  and an end of the fourth opening  222   b , and an overlay deviation between an end of the first color filter layer  221  and an end of the sixth opening  223   b . 
     When two or more layers overlapping each other are formed, in a case where each layer is shifted in the up, down, left, or right directions, an overlapping area may become different from an initially designed overlapping area. Here, the overlay deviation may denote a difference between these overlapping areas. 
     The width of the first opening  221   a  was varied by about 3 µm. The width of the fifth opening  223   a  was varied by about 3 µm. In addition, the overlay deviation between the end of the first opening  221   a  and the end of the fifth opening  223   a  was varied by about 2.4 µm. Reflecting this, the first shortest distance d1 was derived to be about 4.9 µm. 
     The width of the fourth opening  222   b  was varied by about 3 µm. The width of the sixth opening  223   b  was varied by about 3 µm. In addition, the overlay deviation between the end of the first color filter layer  221  and the end of the fourth opening  222   b  was varied by about 2.4 µm. The overlay deviation between the end of the first color filter layer  221  and the end of the sixth opening  223   b  was varied by about 2.4 µm. Reflecting this, the second shortest distance d2 was derived to be about 5.5 µm. 
     Through this, that the first shortest distance d1 is different from the second shortest distance d2 in the plan view may be confirmed. In addition, that the second shortest distance d2 is greater than the first shortest distance d1 in the plan view may be confirmed. 
     Referring back to  FIGS.  4 ,  5  and  6   , a light blocking layer may be located under the second substrate  210 . The light blocking layer may overlap the light blocking area BA. Light emitted from the color conversion layer  260  may transmit only a partial area of the second substrate  210 . That is, light emitted from the color conversion layer  260  may transmit only an area of the second substrate  210  overlapping the light emitting areas LA 1 , LA 2 , and LA 3 , and not transmit an area of the second substrate  210  overlapping the light blocking area BA. 
     According to some embodiments, the light blocking layer may be defined as a stacked portion by overlapping the first color filter layer  271 , the second color filter layer  272 , and the third color filter layer  273  in the light blocking area BA. Alternatively, the light blocking layer may be defined as a portion of the first color filter layer  271  overlapping the light blocking area BA. 
     The light blocking layer may include a light blocking material. For example, the light blocking material may have a specific color. According to some embodiments, the light blocking material may have a blue color. 
     The low refractive index layer  230  may be located under the color filter layer  220 . The low refractive index layer  230  may cover the color filter layer  220 . The low refractive index layer  230  may have a relatively low refractive index. For example, a refractive index of the low refractive index layer  230  may be lower than a refractive index of the color conversion layer  260 . The low refractive index layer  230  may include an organic material. For example, the low refractive index layer  230  may include an organic polymer material including silicon. 
     The first protection layer  241  may be located under the low refractive index layer  230 . The first protection layer  241  may cover the low refractive index layer  230 . The first protective layer  241  may block external impurities to prevent or reduce contamination of the color filter layer  220 . The first protection layer  241  may include an inorganic material. For example, the first protection layer  241  may include silicon oxide, silicon nitride, aluminum nitride, and the like. These may be used alone or in combination with each other. 
     The bank structure  250  may be located under the first protection layer  241 . The bank structure  250  may surround the color conversion layer  260 . A space for accommodating an ink composition may be formed in the bank structure  250  in a process of forming the color conversion layer  260 . Accordingly, the bank structure  250  may have a grid shape or a matrix shape in the plan view. 
     For example, the bank structure  250  may include an organic material such as an epoxy-based resin, a phenolic resin, an acrylic resin, a silicone-based resin, and the like. These may be used alone or in combination with each other. According to some embodiments, the bank structure  250  may include a light blocking material to serve as a black matrix. For example, at least a portion of the bank structure  250  may include a light blocking material such as pigment, dye, carbon black, and the like. In addition, the bank structure  250  may overlap a portion of the light blocking area BA. 
     The color conversion layer  260  may be located under the first protection layer  241 . The color conversion layer  260  may overlap the color filter layers  221 ,  222 , and  223 . The color conversion layer  260  may convert light emitted from the light emitting element  150  into light having a specific wavelength. For example, the color conversion layer  260  may include a color conversion particle. 
     The color conversion layer  260  may include a first color conversion layer  262 , a second color conversion layer  264 , and a transmission layer  265 . The first color conversion layer  262  may partially overlap the second light emitting area LA 2 , the second color conversion layer  264  may partially overlap the third light emitting area LA 3 , and the transmission layer  265  may partially overlap the first light emitting area LA 1 . 
     The first color conversion layer  262  may convert light L1 emitted from the light emitting element  150  into the light Lr of a first color. The second color conversion layer  264  may convert light L1 emitted from the light emitting element  150  into the light Lg of a second color. The transmission layer  265  may transmit light L1 emitted from the light emitting element  150 . According to some embodiments, the first color may be red, and the second color may be green. In addition, the transmission layer  265  may transmit the blue light Lb. 
     The first color conversion layer  262  may include a first color conversion particle that is excited by the light L1 generated from the light emitting element  150  to emit the light of the first color (e.g., the red light Lr). In addition, the first color conversion layer  262  may further include a first photosensitive polymer in which first scattering particles are dispersed. 
     The second color conversion layer  264  may include a second color conversion particle that is excited by the light L1 generated from the light emitting element  150  to emit the light of the second color (e.g., the green light Lg). In addition, the second color conversion layer  264  may further include a second photosensitive polymer in which second scattering particles are dispersed. Each of the first color conversion particle and the second color conversion particle may denote a quantum dot. 
     The transmission layer  265  may transmit the light L1 generated from the light emitting element  150  and emit the light L1 toward the second substrate  210 . The transmission layer  265  may include a third photosensitive polymer in which third scattering particles are dispersed. For example, each of the first, second, and third photosensitive polymers may include an organic material having light transmittance, such as a silicone resin, an epoxy resin, and the like. The first, second, and third photosensitive polymers may include the same material. The first, second, and third scattering particles may scatter and emit the light L1 generated from the light emitting element  150 , and the first, second, and third scattering particles may include the same material. 
     Accordingly, the first light emitting area LA 1  may emit the blue light Lb, the second light emitting area LA 2  may emit the red light Lr, and the third light emitting area LA 3  may emit the green light Lg. 
     The second protection layer  242  may be located under the bank structure  250  and the color conversion layer  260 . The second protection layer  242  may cover the color conversion layer  260  and the bank structure  250 . For example, the second protection layer  242  may include an inorganic material. For example, the second protection layer  242  may include silicon oxide, silicon nitride, aluminum nitride, and the like. These may be used alone or in combination with each other. 
     In the color conversion substrate  200  according to some embodiments of the present invention, the first color filter layer  221 , the second color filter layer  222  and the third color filter layer  223  for transmitting light of different colors may be sequentially located under the second substrate  210 . The first opening  221   a  of the first color filter layer  221  may correspond to the second light emitting area LA 2 , the second opening  221   b  of the first color filter layer  221  may correspond to the third light emitting area LA 3 , and the fourth opening  222   b  of the second color filter layer  222  may correspond to the first light emitting area LA 1 . In addition, a stacked portion in which the first to third color filter layers  221 ,  222 , and  223  are overlapped in the light blocking area BA may function as the light blocking layer. Accordingly, a manufacturing cost of the display device  1000  may be reduced. 
       FIGS.  7 ,  8 ,  9 ,  10 ,  11 ,  12 ,  13  and  14    are views illustrating a method of manufacturing the color conversion substrate of  FIGS.  5  and  6   . For example,  FIG.  8    is a cross-sectional view of the first color filter layer  221  of  FIG.  7    taken along the line IV-IV′.  FIG.  10    is a cross-sectional view of the second color filter layer  222  of  FIG.  9    taken along the line V-V′.  FIG.  12    is a cross-sectional view of the third color filter layer  223  of  FIG.  11    taken along the line VI-VI′. 
     Referring to  FIGS.  7  and  8   , the first color filter layer  221  may be formed on the second substrate  210 . For example, the second substrate  210  may be formed of a transparent resin substrate. The second substrate  210  may include an insulating material such as glass or plastic. Alternatively, the second substrate  210  may include an organic polymer material such as polycarbonate, polyethylene, polypropylene, and the like. 
     The first color filter layer  221  may overlap the first light emitting area LA 1 . In addition, the first color filter layer  221  may further overlap the light blocking area BA. That is, a first portion of the first color filter layer  221  may overlap the first light emitting area LA 1 , and a second portion of the first color filter layer  221  may overlap the light blocking area BA. 
     The first color filter layer  221  may have the first opening  221   a  corresponding to the second light emitting area LA 2  and the second opening  221   b  corresponding to the third light emitting area LA 3 . Accordingly, the first color filter layer  221  may define the second light emitting area LA 2  and the third light emitting area LA 3 . 
     According to some embodiments, the first color filter layer  221  may be a blue color filter that transmits blue light. For example, the first color filter layer  221  may be formed of a blue pigment and/or a color filter composition including a blue pigment. 
     Referring to  FIGS.  9  and  10   , the second color filter layer  222  may be formed on the second substrate  210  and the first color filter layer  221 . 
     The second color filter layer  222  may overlap the second light emitting area LA 2 . In addition, the second color filter layer  222  may further overlap a portion of the light blocking area BA. That is, a first portion of the second color filter layer  222  may overlap the second light emitting area LA 2 , and a second portion of the second color filter layer  222  may overlap a portion of the light blocking area BA. 
     The second color filter layer  222  may have the third opening  222   a  and the fourth opening  222   b . A portion of the third opening  222   a  may overlap the third light emitting area LA 3 , and the fourth opening  222   b  may correspond to the first light emitting area LA 1 . The width of the third opening  222   a  may be greater than the width of the second opening  221   b . Accordingly, the second color filter layer  222  may define the first light emitting area LA 1 . 
     According to some embodiments, the second color filter layer  222  may be a red color filter that transmits red light. For example, the second color filter layer  222  may be formed from a red pigment and/or a color filter composition including a red pigment. 
     Referring to  FIGS.  11  and  12   , the third color filter layer  223  may be formed on the second substrate  210  and the second color filter layer  222 . 
     The third color filter layer  223  may overlap the third light emitting area LA 3 . In addition, the third color filter layer  223  may further overlap a portion of the light blocking area BA. That is, a first portion of the third color filter layer  223  may overlap the third light emitting area LA 3 , and a second portion of the third color filter layer  223  may overlap a portion of the light blocking area BA. 
     The third color filter layer  223  may have the fifth opening  223   a  and the sixth opening  223   b . A portion of the fifth opening  223   a  may overlap the second light emitting area LA 2 , and a portion of the sixth opening  223   b  may overlap the first light emitting area LA 1 . That is, the width of the fifth opening  223   a  may be greater than the width of the first opening  221   a  and the width of the sixth opening  223   b  may be greater than the width of the fourth opening  222   b . 
     According to some embodiments, the third color filter layer  223  may be a green color filter that transmits green light. For example, the third color filter layer  223  may be formed from a green pigment and/or a color filter composition including a green pigment. 
     Accordingly, the color filter layer  220  including the first color filter layer  221 , the second color filter layer  222 , and the third color filter layer  223  may be formed on the second substrate  210 . That is, the first color filter layer  221 , the second color filter layer  222 , and the third color filter layer  223  may be sequentially formed. 
     Referring to  FIGS.  13  and  14   , the low refractive index layer  230  may be formed on the color filter layer  220 . The low refractive index layer  230  may cover the color filter layer  220 . The low refractive index layer  230  may have a relatively low refractive index. For example, the low refractive index layer  230  may be formed using an organic material. 
     The first protection layer  241  may be formed on the low refractive index layer  230 . The first protection layer  241  may cover the low refractive index layer  230 . For example, the first protection layer  241  may be formed using an inorganic material. 
     The bank structure  250  may be formed on the first protection layer  241 . The bank structure  250  may be formed to overlap a portion of the light blocking area BA. For example, the bank structure  250  may include an organic material and the like. In addition, the bank structure  250  may include a light blocking material. 
     The bank structure  250  may have a first opening area OP 1 , a second opening area OP 2 , and a third opening area OP 3 . A portion of the first opening area OP 1  may overlap with the second light emitting area LA 2 , a portion of the second opening area OP 2  may overlap with the third light emitting area LA 3 , and a portion of the third opening area OP 3  may overlap with first light emitting area LA 1 . Each of the first, second, and third opening areas OP 1 , OP 2 , and OP 3  may receive an ink composition in a process of forming the color conversion layer  260 . 
     An inkjet apparatus  400  may drop the ink composition onto the first opening area OP 1 . Here, the ink composition may be a material for forming a color conversion layer. 
     The first color conversion layer  262  may be formed by the inkjet apparatus  400  repeatedly dropping the ink composition onto the first opening area OP 1 . In addition, the second color conversion layer  264  may be formed by the inkjet apparatus  400  repeatedly dropping the ink composition onto the second opening area OP 2  and the transmission layer  265  may be formed by the inkjet apparatus  400  repeatedly dropping the ink composition onto the third opening area OP 3 . 
     Referring back to  FIGS.  4 ,  5 , and  6   , the second protection layer  242  may be formed on the bank structure  250  and the color conversion layer  260 . The second protection layer  242  may cover the color conversion layer  260  and the bank structure  250 . For example, the second protection layer  242  may be formed using an inorganic material. 
     Accordingly, the color conversion substrate  200  illustrated in  FIGS.  4 ,  5  and  6    may be manufactured. 
       FIGS.  15 ,  16 ,  17 ,  18 ,  19 ,  20 , and  21    are cross-sectional views illustrating color conversion substrates according to other embodiments. 
     First, referring to  FIGS.  15 ,  16 ,  17 ,  18 ,  19 , and  20   , the color conversion substrates  201 ,  202 ,  203 ,  204 ,  205 , and  206  according to other embodiments of the present invention may include a second substrate  210 , a color filter layer  220 , a low refractive index layer  230 , a first protection layer  241 , a color conversion layer  260 , a bank structure  250 , and a second protection layer  242 . However, the color conversion substrates  201 ,  202 ,  203 ,  204 ,  205 , and  206  described with reference to  FIGS.  15 ,  16 ,  17 ,  18 ,  19 , and  20    may be substantially the same as or similar to the color conversion substrate  200  described with reference to  FIGS.  4 ,  5 , and  6    except for a stacking order of color filter layers  221 ,  222 , and  223 . Hereinafter, overlapping descriptions will be omitted. 
     As described above, the first color filter layer  221 , the second color filter layer  222 , and the third color filter layer  223  may transmit light of different colors with each other. According to some embodiments, the first color filter layer  221  overlapping the first light emitting area LA 1  may transmit blue light, the second color filter layer  222  overlapping the second light emitting area LA 2  may transmit red light, and the third color filter layer  223  overlapping the third light emitting area LA 3  may transmit green light. Accordingly, the first light emitting area LA 1  may emit blue light, the second light emitting area LA 2  may emit red light, and the third light emitting area LA 3  may emit green light. 
     The first color filter layer  221  may have a first opening  221   a  and a second opening  221   b , the second color filter layer  222  may have a third opening  222   a  and a fourth opening  222   b , and the third color filter layer  223  may have a fifth opening  223   a  and a sixth opening  223   b . 
     As shown in  FIG.  15   , the first color filter layer  221  may be located under the second substrate  210 . The third color filter layer  223  may be located under the second substrate  210  and the first color filter layer  221 . The second color filter layer  222  may be located under the second substrate  210  and the third color filter layer  223 . That is, the first color filter layer  221 , the third color filter layer  223 , and the second color filter layer  222  may be sequentially arranged under the second substrate  210 . 
     According to some embodiments, the first opening  221   a  of the first color filter layer  221  may correspond to the third light emitting area LA 3  and the second opening  221   b  of the first color filter layer  221  may correspond to the second light emitting the area LA 2 . In addition, the sixth opening  223   b  of the third color filter layer  223  may correspond to the first light emitting area LA 1 . Accordingly, the first color filter layer  221  may define the second light emitting area LA 2  and the third light emitting area LA 3 , respectively, and the third color filter layer  222  may define the first light emitting area LA 1 . 
     As shown in  FIG.  16   , the second color filter layer  222  may be located under the second substrate  210 . The third color filter layer  223  may be located under the second substrate  210  and the second color filter layer  222 . The first color filter layer  221  may be located under the second substrate  210  and the third color filter layer  223 . That is, the second color filter layer  222 , the third color filter layer  223 , and the first color filter layer  221  may be sequentially located under the second substrate  210 . 
     According to some embodiments, the third opening  222   a  of the second color filter layer  222  may correspond to the third light emitting area LA 3 , and the fourth opening  222   b  of the second color filter layer  222  may correspond to the first light emitting area LA 1 . In addition, the sixth opening  223   b  of the third color filter layer  223  may correspond to the second light emitting area LA 2 . Accordingly, the second color filter layer  222  may define the third light emitting area LA 3  and the first light emitting area LA 1 , respectively, and the third color filter layer  222  may define the second light emitting area LA 2 . 
     As shown in  FIG.  17   , the second color filter layer  222  may be located under the second substrate  210 . The first color filter layer  221  may be located under the second substrate  210  and the second color filter layer  222 . The third color filter layer  223  may be located under the second substrate  210  and the first color filter layer  221 . That is, the second color filter layer  222 , the first color filter layer  221 , and the third color filter layer  223  may be sequentially located under the second substrate  210 . 
     According to some embodiments, the third opening  222   a  of the second color filter layer  222  may correspond to the first light emitting area LA 1 , and the fourth opening  222   b  of the second color filter layer  222  may correspond to the third light emitting area LA 3 . In addition, the second opening  221   b  of the first color filter layer  221  may correspond to the second light emitting area LA 2 . Accordingly, the second color filter layer  222  may define the first light emitting area LA 1  and the third light emitting area LA 3 , respectively, and the first color filter layer  221  may define the second light emitting area LA 2 . 
     As shown in  FIG.  18   , the third color filter layer  223  may be located under the second substrate  210 . The first color filter layer  221  may be located under the second substrate  210  and the third color filter layer  223 . The second color filter layer  222  may be located under the second substrate  210  and the first color filter layer  221 . That is, the third color filter layer  223 , the first color filter layer  221 , and the second color filter layer  222  may be sequentially located under the second substrate  210 . 
     According to some embodiments, the fifth opening  223   a  of the third color filter layer  223  may correspond to the first light emitting area LA 1  and the sixth opening  223   b  of the third color filter layer  223  may correspond to the second light emitting area LA 2 . In addition, the second opening  221   b  of the first color filter layer  221  may correspond to the third light emitting area LA 3 . Accordingly, the third color filter layer  223  may define the first light emitting area LA 1  and the second light emitting area LA 2 , respectively, and the first color filter layer  221  may define the third light emitting area LA 3 . 
     As shown in  FIG.  19   , the third color filter layer  223  may be located under the second substrate  210 . The second color filter layer  222  may be located under the second substrate  210  and the third color filter layer  223 . The first color filter layer  221  may be located under the second substrate  210  and the second color filter layer  222 . That is, the third color filter layer  223 , the second color filter layer  222 , and the first color filter layer  221  may be sequentially located under the second substrate  210 . 
     According to some embodiments, the fifth opening  223   a  of the third color filter layer  223  may correspond to the second light emitting area LA 2  and the sixth opening  223   b  of the third color filter layer  223  may correspond to the first light emitting area LA 1 . In addition, the fourth opening  222   b  of the second color filter layer  222  may correspond to the third light emitting area LA 3 . Accordingly, the third color filter layer  223  may define the second light emitting area LA 2  and the first light emitting area LA 1 , respectively, and the first color filter layer  221  may define the third light emitting area LA 3 . 
     As shown in  FIG.  20   , the second color filter layer  222  may be located under the second substrate  210 . The first color filter layer  221  may be located under the second substrate  210  and the second color filter layer  222 . The third color filter layer  223  may be located under the second substrate  210  and the first color filter layer  221 . That is, the second color filter layer  222 , the first color filter layer  221 , and the third color filter layer  223  may be sequentially located under the second substrate  210 . 
     According to some embodiments, the third opening  222   a  of the second color filter layer  222  may correspond to the first light emitting area LA 2 . In addition, the first opening  221   a  of the first color filter layer  221  may correspond to the third light emitting area LA 3  and the second opening  221   b  of the first color filter layer  221  may correspond to the second light emitting area LA 2 . Accordingly, the second color filter layer  222  may define the first light emitting area LA 1 , and the first color filter layer  221  may define the third light emitting area LA 3  and the second light emitting area LA 2 , respectively. 
     Referring to  FIG.  21   , the color conversion substrate  207  according to some embodiments of the present invention includes a second substrate  210 , a color filter layer  270 , a low refractive index layer  230 , a first protection layer  241 , a color conversion layer  260 , a bank structure  250 , and a second protection layer  242 . However, the color conversion substrate  207  described with reference to  FIG.  21    may be substantially the same as or similar to the color conversion substrate  200  described with reference to  FIGS.  4 ,  5 , and  6    except for the color filter layer  270 . Hereinafter, overlapping descriptions will be omitted. 
     The color filter layer  270  may be located under the second substrate  210 . The color filter layer  270  may include a first color filter layer  271 , a second color filter layer  272  , and a third color filter layer  273 . According to some embodiments, the first color filter layer  271  may overlap the first light emitting area LA 1 , the second color filter layer  272  may overlap the second light emitting area LA 2 , and the third color filter layer  273  may overlap the third light emitting area LA 3 . That is, the first, second, and third color filter layers  271 ,  272 , and  273  may not overlap the light blocking area BA. 
     According to some embodiments, the bank structure  250  may overlap only the light blocking area BA without overlapping the first, second, and third light emitting areas LA 1 , LA 2 , and LA 3 . That is, the bank structure  250  may define first, second, and third light emitting areas LA 1 , LA 2 , and LA 3 . 
       FIG.  22    is a cross-sectional view illustrating a display device according to some embodiments. 
     Referring to  FIG.  22   , the display device  1100  according to some embodiments may include a first substrate  110 , a driving element  120 , an insulating structure  130 , a pixel defining layer  140 , a light emitting element  150 , an encapsulation structure  160 , a bank structure  410 , a color conversion layer  420 , a low refractive index layer  430 , a color filter layer  440 , and a protection layer  450 . Hereinafter, a description overlapping with the display device  1000  described with reference to  FIG.  4    will be omitted. 
     The display device  1100  according to some embodiments of the present invention may have a single substrate structure. For example, the color conversion layer  420  may be located on the encapsulation structure  160 . The color conversion layer  420  may include a color conversion particle. 
     The color conversion layer  420  may include a first color conversion layer  422 , a second color conversion layer  424 , and a transmission layer  425 . The first color conversion layer  422  may partially overlap the second light emitting area LA 2 , the second color conversion layer  424  may partially overlap the third light emitting area LA 3 , and the transmission layer  425  may partially overlap the first light emitting area LA 1 . 
     The first color conversion layer  422  may include a first color conversion particle. In addition, the first color conversion layer  422  may further include a first photosensitive polymer in which first scattering particles are dispersed. The second color conversion layer  424  may include a second color conversion particle. In addition, the second color conversion layer  424  may further include a second photosensitive polymer in which second scattering particles are dispersed. Each of the first color conversion particle and the second color conversion particle may denote a quantum dot. The transmission layer  425  may include a third photosensitive polymer in which third scattering particles are dispersed. For example, each of the first, second, and third photosensitive polymers may include an organic material having light transmittance, such as a silicone resin, an epoxy resin, and the like. The first, second, and third photosensitive polymers may include the same material. The first, second, and third scattering particles may include the same material. 
     The bank structure  410  may be located on the encapsulation structure  160 . The bank structure  410  may surround the color conversion layer  420 . A space for accommodating an ink composition may be formed in the bank structure  410  in a process of forming the color conversion layer  420 . In addition, the bank structure  410  may overlap a portion of the light blocking area BA. For example, the bank structure  410  may include a light blocking material. 
     The low refractive index layer  430  may be located on the bank structure  410  and the color conversion layer  420 . The low refractive index layer  430  may have a relatively low refractive index. For example, a refractive index of the low refractive index layer  430  may be lower than a refractive index of the color conversion layer  420 . The low refractive index layer  430  may include an organic material. For example, the low refractive index layer  430  may include an organic polymer material including silicon. 
     The color filter layer  440  may be located on the low refractive index layer  430 . The color filter layer  440  may include a first color filter layer  441 , a second color filter layer  442 , and a third color filter layer  443 . 
     The first color filter layer  441  may include a first transmitting portion overlapping the first light emitting area LA 1  and a first light blocking portion overlapping the light blocking area BA. According to some embodiments, the first light blocking portion of the first color filter layer  441  may be entirely located in the light blocking area BA. 
     The second color filter layer  442  may include a second transmitting portion overlapping the second light emitting area LA 2  and a second light blocking portion overlapping a portion of the light blocking area BA. In addition, the third color filter layer  443  may include a third transmission portion overlapping the third light emitting area LA 3  and a third light blocking portion overlapping a portion of the light blocking area BA. 
     The protection layer  450  may be located on the color filter layer  440 . The protection layer  450  may cover the color filter layer  440 . For example, the protection layer  450  may include an inorganic material or an organic material. Examples of the inorganic material that can be used as the protection layer  450  may include silicon oxide, silicon nitride, silicon oxynitride, and the like. These may be used alone or in combination with each other. 
     Aspects of embodiments according to the present disclosure can be applied to various display devices that may include a display device. For example, embodiments according to the present disclosure can be applied to high-resolution smartphones, mobile phones, smart pads, smart watches, tablet PCs, in-vehicle navigation systems, televisions, computer monitors, notebook computers, and the like. 
     The foregoing is illustrative of embodiments and is not to be construed as limiting thereof. Although a few embodiments have been described, those skilled in the art will readily appreciate that many modifications are possible in the embodiments without materially departing from the novel teachings and advantages of the present inventive concept. Accordingly, all such modifications are intended to be included within the scope of the present inventive concept as defined in the claims. Therefore, it is to be understood that the foregoing is illustrative of various embodiments and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims, and their equivalents.