Patent Publication Number: US-2021191556-A1

Title: Touch display device

Description:
This application claims the benefit of Korean Patent Application No. 10-2019-0169943, filed on Dec. 18, 2019, which is hereby incorporated by reference as if fully set forth herein. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a touch display device, and more particularly to a touch display device for minimizing viewing-angle-dependent variation in color coordinates. 
     Discussion of the Related Art 
     A touch sensor is an input device through which a user may input a command by selecting instructions displayed on a screen of a display device using a hand or an object. That is, the touch sensor converts a contact position that directly contacts a human hand or an object into an electrical signal and receives selected instructions based on the contact position as an input signal. Such a touch sensor may substitute for a separate input device that is connected to a display device and operated, such as a keyboard or a mouse, and thus the range of application of the touch sensor is continually increasing. 
     Recently, research and development have been actively conducted on a touch display device in which touch electrodes  50 , which constitute a touch sensor, are disposed on a display panel including a display element such as a light-emitting element  10  or a liquid crystal element, as shown in  FIG. 1 . 
     However, when a user uses a touch display device from a side viewing angle direction, rather than from a front viewing angle direction, a portion of the light generated in the light-emitting element  10  may not be radiated to the outside due to the presence of the touch electrodes  50 . Accordingly, when a user uses the touch display device from a front viewing angle direction, a white color is realized normally, but when a user uses the touch display device from a side viewing angle direction, color coordinates vary, and thus a white color is not realized normally. In particular, although the sizes of emission areas of subpixels are different, the areas in which light is blocked by the touch electrodes are the same at the side viewing angle, and thus variation in color coordinates is large at the side viewing angle. 
     SUMMARY 
     Accordingly, embodiments of the present invention are directed to a touch display device that substantially obviates one or more problems due to limitations and disadvantages of the related art. 
     An aspect of the present disclosure is to provide a touch display device for minimizing viewing-angle-dependent variation in color coordinates. 
     Additional features and aspects will be set forth in the description that follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts provided herein. Other features and aspects of the inventive concepts may be realized and attained by the structure particularly pointed out in the written description, or derivable therefrom, and the claims hereof as well as the appended drawings. 
     To achieve these and other aspects of the inventive concepts, as embodied and broadly described herein, a touch display device comprises a light-emitting element disposed in each of a plurality of subpixels including emission areas having different sizes, a plurality of touch electrodes disposed on the light-emitting element, and at least one opening formed in each of the plurality of touch electrodes. The width of the opening is formed differently in each of the plurality of subpixels including the emission areas having different sizes. 
     It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the inventive concepts as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain various principles. In the drawings: 
         FIG. 1  is a cross-sectional view showing a conventional touch display device; 
         FIG. 2  is a plan view showing a touch display device according to the present invention; 
         FIG. 3  is a perspective view showing the touch display device shown in  FIG. 2 ; 
         FIG. 4  is a cross-sectional view of the touch display device taken along line I-I′ in  FIG. 3 ; 
         FIG. 5  is a view showing the relationships between the touch electrodes and the subpixels shown in  FIGS. 2 and 3 ; 
         FIGS. 6A to 6D  are plan views showing embodiments of the touch electrodes shown in  FIG. 5 ; 
         FIG. 7  is a view showing emission areas at a front viewing angle and at a side viewing angle in the touch display device according to the present invention; 
         FIG. 8A  is a plan view showing the first region A 1  shown in  FIG. 2  in detail; 
         FIG. 8B  is a plan view showing the second region A 2  shown in  FIG. 2  in detail; and 
         FIG. 9  is a plan view showing another embodiment of the routing lines shown in  FIG. 2 . 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to exemplary embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. 
       FIG. 2  is a plan view showing a touch display device according to the present invention. 
     The touch display device shown in  FIG. 2  includes a plurality of touch electrodes  150  (T 11  to T 76 ) and touch lines  160  connected to the respective touch electrodes  150 . 
     Each of the touch electrodes  150  includes a capacitance formed therein, and thus is used as a self-capacitance-type touch sensor that senses variation in capacitance due to a user touch. In a self-capacitance sensing method using such touch electrodes  150 , when a driving signal supplied through the touch line  160  is applied to the touch electrode  150 , an electric charge Q accumulates in the touch sensor. At this time, when a user&#39;s finger or a conductive object touches the touch electrode  150 , parasitic capacitance is additionally connected to the self-capacitance sensor, and thus the capacitance value varies. Therefore, it is possible to determine the presence or absence of a touch based on the difference in capacitance values between a touch sensor that is touched by a finger and a touch sensor that is not touched by a finger. 
     The touch electrodes  150 , as shown in  FIG. 3 , are divided from each other in first and second directions intersecting each other, and are independently formed on an encapsulation unit  140 . Each of the touch electrodes  150  is formed in a region corresponding to a plurality of subpixels in consideration of the size of an area touched by a user. For example, one touch electrode  150  is formed in a region that is from several times to several hundred times larger than the size of one subpixel. 
     The touch electrodes  150  are formed so as to be the same size as each other. Accordingly, variation in touch sensitivity between the touch electrodes  150  is minimized, thus reducing noise. 
     The touch electrodes  150  are connected to the touch lines  160 , and thus are connected to a touch-driving circuit (not shown). 
     The touch electrodes  150  and the touch lines  160  of the present invention are directly formed on a display panel that generates an image. Specifically, as shown in  FIGS. 3 and 4 , the touch display device according to the present invention includes light-emitting elements  120  arranged in a matrix form on a substrate  111 , an encapsulation unit  140  disposed on the light-emitting elements  120 , and touch electrodes  150  disposed on the encapsulation unit  140 . 
     The substrate  111  is formed of a flexible material such as plastic or glass so as to be foldable or bendable. For example, the substrate  111  is formed of polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyethersulfone (PES), polyacrylate (PAR), polysulfone (PSF), or cyclic-olefin copolymer (COC). 
     A plurality of thin-film transistors  130 , included in the pixel-driving circuit, is disposed on the substrate  111 . Each of the thin-film transistors  130  includes a semiconductor layer  134  disposed on a multi-buffer film  112 , a gate electrode  132  overlapping the semiconductor layer  134  with a gate insulating film  102  interposed therebetween, and source and drain electrodes  136  and  138  formed on an interlayer insulating film  114  so as to be in contact with the semiconductor layer  134 . Here, the semiconductor layer  134  is formed of at least one of an amorphous semiconductor material, a polycrystalline semiconductor material, or an oxide semiconductor material. 
     The light-emitting element  120  includes an anode  122 , at least one light-emitting stack  124  formed on the anode  122 , and a cathode  126  formed on the light-emitting stack  124 . 
     The anode  122  is electrically connected to the drain electrode  138  of the thin-film transistor  130 , which is exposed through a pixel contact hole  116  penetrating a protective film  108  and a pixel planarization layer  118 . 
     At least one light-emitting stack  124  is formed on the anode  122  in an emission area that is defined by a bank  128 . The at least one light-emitting stack  124  is formed by stacking a hole-related layer, an organic emission layer, and an electron-related layer on the anode  122  in that order or in the reverse order. In addition, the light-emitting stack  124  may include first and second light-emitting stacks, which face each other with a charge generation layer interposed therebetween. In this case, the organic emission layer of any one of the first and second light-emitting stacks generates blue light, and the organic emission layer of the other one of the first and second light-emitting stacks generates yellow-green light, whereby white light is generated through the first and second light-emitting stacks. Since the white light generated in the light-emitting stack  124  is incident on a color filter located above or below the light-emitting stack  124 , a color image may be realized. Alternatively, colored light corresponding to each subpixel may be generated in each light-emitting stack  124  without a separate color filter in order to realize a color image. That is, the light-emitting stack  124  of the red subpixel may generate red light, the light-emitting stack  124  of the green subpixel may generate green light, and the light-emitting stack  124  of the blue subpixel may generate blue light. 
     The cathode  126  is formed so as to face the anode  122 , with the light-emitting stack  124  interposed therebetween, and is connected to a low-voltage supply line. 
     The encapsulation unit  140  prevents external moisture or oxygen from permeating the light-emitting element  120 , which is vulnerable to external moisture or oxygen. To this end, the encapsulation unit  140  includes at least one inorganic encapsulation layer  142  and at least one organic encapsulation layer  144 . In the present invention, the structure of the encapsulation unit  140 , in which the first inorganic encapsulation layer  142 , the organic encapsulation layer  144  and the second inorganic encapsulation layer  146  are stacked in that order, will be described by way of example. 
     The first inorganic encapsulation layer  142  is formed on the substrate  111 , on which the cathode  126  has been formed. The second inorganic encapsulation layer  146  is formed on the substrate  111 , on which the organic encapsulation layer  144  has been formed, so as to cover the top surface, the bottom surface and the side surface of the organic encapsulation layer  144  together with the first inorganic encapsulation layer  142 . 
     The first and second inorganic encapsulation layers  142  and  146  minimize or prevent the permeation of external moisture or oxygen into the light-emitting stack  124 . The first and second inorganic encapsulation layers  142  and  146  are formed of an inorganic insulating material that is capable of being deposited at a low temperature, such as silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), or aluminum oxide (Al2O3). Thus, since the first and second inorganic encapsulation layers  142  and  146  are deposited in a low-temperature atmosphere, it is possible to prevent damage to the light-emitting stack  124 , which is vulnerable to a high-temperature atmosphere, during the process of depositing the first and second inorganic encapsulation layers  142  and  146 . 
     The organic encapsulation layer  144  serves to dampen the stress between the respective layers due to bending of the organic light-emitting display device and to increase planarization performance. The organic encapsulation layer  144  is formed on the substrate  111 , on which the first inorganic encapsulation layer  142  has been formed, using a non-photosensitive organic insulating material, such as PCL, acrylic resin, epoxy resin, polyimide, polyethylene or silicon oxycarbide (SiOC), or using a photosensitive organic insulating material such as photoacryl. The organic encapsulation layer  144  is disposed in the active area, rather than in the non-active area. 
     The mesh-type touch electrodes  150  and the touch lines  160  are disposed on the encapsulation unit  140 . In order to prevent an increase in the capacitance of the parasitic capacitor between the touch electrodes  150  and the cathode  126 , a touch buffer film  148 , which is implemented as an inorganic or organic insulating film, may be disposed between the encapsulation unit  140  and the touch electrodes  150 . In this case, the touch lines  160  are disposed along the side surface of the touch buffer film  148 . In a touch display device not including the touch buffer film  148 , the touch lines  160  are disposed along the side surface of the second inorganic encapsulation layer  146 . 
     The touch electrodes  150  and the touch lines  160  are disposed in the same plane and are formed of the same material. That is, the touch electrodes  150  and the touch lines  160  are disposed in a single-layered structure without an insulating film. Accordingly, the touch electrodes  150  and the touch lines  160  may be formed through a single mask process. Further, it is possible to reduce the thickness of the touch display device that includes the touch electrodes  150  and the touch lines  160 . 
     The touch electrodes  150  and the touch lines  160  are formed in a single-layered or multi-layered structure using a touch metal layer formed of a material having high corrosion resistance and acid resistance and excellent conductivity, such as Ta, Ti, Cu, or Mo. For example, the touch electrodes  150  and the touch lines  160  are formed in a triple-layered structure such as a stack of Ti/Al/Ti, MoTi/Cu/MoTi, or Ti/Al/Mo. 
     Black matrixes (not shown) may be disposed on the touch electrodes  150  and the touch lines  160 , and color filters (not shown) may be disposed between the black matrixes. 
     The black matrixes prevent the touch electrodes  150  and the touch lines  160  from being visible due to reflection of external light. The color filters prevent the cathode  126  from being visible due to reflection of external light. Further, the black matrixes and the color filters may be disposed between the touch electrodes  150  and the encapsulation unit  140  in order to prevent an increase in the capacitance of the parasitic capacitor between the touch electrodes  150  and the cathode  126 . 
     A touch pad  170  connected to the touch lines  160  is connected to a signal transmission film on which the touch-driving circuit (not shown) is mounted. 
     The touch pad  170  includes a lower touch pad electrode  172  and an upper touch pad electrode  174  that is in contact with the lower touch pad electrode  172 . The lower touch pad electrode  172  is disposed in the same plane as at least one of the gate electrode  132  or the drain electrode  138 , and is formed of the same material. For example, the lower touch pad electrode  172  is formed of the same material as the drain electrode  138 , and is disposed in the same plane as the drain electrode  138 , i.e. on the interlayer insulating film  114 . The upper touch pad electrode  174  is disposed in the same plane as the touch electrode  150 , and is formed of the same material. The upper touch pad electrode  174  is electrically connected to the lower touch pad electrode  172 , which is exposed through a touch pad contact hole  176  that penetrates the protective film  108  and the touch buffer film  148 . 
     As shown in  FIG. 5 , the touch electrode  150  of the touch display device according to the present invention is formed to have therein at least one opening  152   r ,  152   g  and  152   b . For example, the touch electrode  150  disposed so as to surround the red (R) subpixel SP has therein a red opening  152   r  having a first width w 1 , the touch electrode  150  disposed so as to surround the green (G) subpixel SP has therein a green opening  152   g  having a second width w 2 , and the touch electrode  150  disposed so as to surround the blue (B) subpixel SP has therein a blue opening  152   b  having a third width w 3 . 
     In this case, the line widths of the red, green and blue openings  152   r ,  152   g  and  152   b  are determined depending on the size of the emission area of the light-emitting layer  124  that is exposed by the bank  128 . The line widths of the red, green and blue openings  152   r ,  152   g  and  152   b  are inversely proportional to the size of the emission area of each subpixel SP. Here, the size of the emission area is determined by multiplying the width WR, WG or WB of the light-emitting layer  124  exposed by the bank  128  in each subpixel SP by the height HR, HG or HB of the light-emitting layer  124  exposed by the bank  128 . 
     Specifically, the line widths w 1 , w 2  and w 3  of the red, green and blue openings  152   r ,  152   g  and  152   b  are determined such that the proportions of the emission areas in the respective subpixels depending on whether light is interrupted by the touch electrode  150  are constant, as expressed using the following Equation 1. In Equation 1, “a” represents the width of the touch electrode  150 . 
     
       
         
           
             
               
                 
                   
                     Area 
                      
                     
                         
                     
                      
                     Proportion 
                      
                     
                         
                     
                      
                     Depending 
                      
                     
                         
                     
                      
                     on 
                      
                     
                         
                     
                      
                     Light 
                      
                     
                         
                     
                      
                     Interruption 
                   
                   = 
                   
                     
 
                   
                    
                   
                     
                       
                         
                           ( 
                           
                             WR 
                             × 
                             HR 
                           
                           ) 
                         
                         - 
                         
                           ( 
                           
                             a 
                             × 
                             W 
                              
                             
                                 
                             
                              
                             1 
                           
                           ) 
                         
                       
                       
                         ( 
                         
                           WR 
                           × 
                           HR 
                         
                         ) 
                       
                     
                     = 
                     
                       
                         
                           
                             ( 
                             
                               WG 
                               × 
                               HG 
                             
                             ) 
                           
                           - 
                           
                             ( 
                             
                               a 
                               × 
                               W 
                                
                               
                                   
                               
                                
                               2 
                             
                             ) 
                           
                         
                         
                           ( 
                           
                             WG 
                             × 
                             HG 
                           
                           ) 
                         
                       
                       = 
                       
                         
                           
                             ( 
                             
                               WB 
                               × 
                               HB 
                             
                             ) 
                           
                           - 
                           
                             ( 
                             
                               a 
                               × 
                               W 
                                
                               
                                   
                               
                                
                               3 
                             
                             ) 
                           
                         
                         
                           ( 
                           
                             WB 
                             × 
                             HB 
                           
                           ) 
                         
                       
                     
                   
                 
               
               
                 
                   Equation 
                    
                   
                       
                   
                    
                   1 
                 
               
             
           
         
       
     
     For example, among the plurality of subpixels SP included in the unit pixel, the line width of the opening in the subpixel SP having the largest emission area is formed to be the narrowest, and the line width of the opening in the subpixel SP having the smallest emission area is formed to be the widest. For example, when the size of the emission area of the red (R) subpixel SP is smaller than the size of the emission area of the green (G) subpixel SP, the line width w 1  of the red opening  152   r  is formed larger than the line width w 2  of the green opening  152   g  according to the size ratio between the emission areas of the red (R) and green (G) subpixels SP. When the size of the emission area of the green (G) subpixel SP is smaller than the size of the emission area of the blue (B) subpixel SP, the line width w 2  of the green opening  152   g  is formed larger than the line width w 3  of the blue opening  152   b  according to the size ratio between the emission areas of the green (G) and blue (B) subpixels SP. 
     Specifically, the touch display device composed of the unit pixel, which includes the green (G) subpixel SP, which has a larger emission area than the red (R) subpixel SP and a smaller emission area than the blue (B) subpixel SP, includes a touch electrode  150 , which is formed in any one of the structures shown in  FIGS. 6A to 6D . 
     The touch electrode  150  shown in  FIGS. 6A and 6B  has therein red and green openings  152   r  and  152   g . The green opening  152   g  is formed by removing a portion of the touch electrode  150  that is located at the lower end of the green (G) subpixel SP. The red opening  152   r  is formed to have a larger line width than the green opening  152   g . Specifically, as shown in  FIG. 6A , the red opening  152   r  is formed by removing a portion of the touch electrode  150  that is located at the lower end of the red (R) subpixel SP. Alternatively, as shown in  FIG. 6B , the red opening  152   r  is formed by removing the entirety of the touch electrode  150  that is located at the lower end of the red (R) subpixel SP. 
     The touch electrode  150  shown in  FIG. 6C  has therein red, green and blue openings  152   r ,  152   g  and  152   b . The blue opening  152   b  is formed by removing a portion of the touch electrode  150  that is located at the lower end of the blue (B) subpixel SP. The green opening  152   g  is formed by removing a portion of the touch electrode  150  that is located at the lower end of the green (G) subpixel SP so as to have a larger line width than the blue opening  152   b . The red opening  152   r  is formed by removing a portion or the entirety of the touch electrode  150  that is located at the lower end of the red (R) subpixel SP so as to have a larger line width than the green opening  152   g.    
     The touch electrode  150  shown in  FIG. 6D  has therein red and green openings  152   r  and  152   g . The green opening  152   g  is formed by removing a portion of the touch electrode  150  that is located at the upper end of the green (G) subpixel SP. The red opening  152   r  is formed by removing a portion or the entirety of the touch electrode  150  that is located at the upper end of the red (R) subpixel SP so as to have a larger line width than the green opening  152   g.    
     Typically, the gaze of a user using the touch display device is directed from the lower end of the touch display device toward the upper end thereof. Thus, as shown in  FIGS. 6A to 6C , it is preferable to form the opening  152   r ,  152   g  or  152   b  in each subpixel SP by removing the touch electrode  150  that is located at the lower end of each subpixel SP. However, as shown in  FIG. 6D , it may be possible to form the opening  152   r ,  152   g  and  152   b  in each subpixel SP by removing the touch electrode  150  that is disposed at the upper end of each subpixel SP. 
     When a user uses the touch display device having the touch electrode  150  from a front viewing angle direction, as shown in  FIG. 7 , none of the light from the emission areas AR 1 , AG 1  and AB 1  of the red (R), green (G) and blue (B) subpixels SP is blocked by the touch electrodes  150 . Here, the front viewing angle direction refers to the situation in which the angle between the touch electrode  150  and the gaze of the user is 90 degrees. 
     When a user uses the touch display device from a side viewing angle direction, the ratios of the light-blocked areas to the emission areas in the red (R), green (G) and blue (B) subpixels SP are constant. Here, the side viewing angle direction refers to the situation in which the angle between the touch electrode  150  and the gaze of the user is equal to or greater than 45 degrees and less than 90 degrees. 
     Accordingly, the proportions of the emission areas AR 1 , AG 1  and AB 1  in the subpixels when viewed from the front viewing angle direction are the same as the proportions of the emission areas AR 2 , AG 2  and AB 2  in the subpixels when viewed from the side viewing angle direction. Thus, since the color coordinate characteristics at the front viewing angle and the color coordinate characteristics at the side viewing angle are similar to each other, it is possible to minimize variation in the color coordinate characteristics at the side viewing angle. 
     Table 1 shows the proportions of the emission areas in the subpixels depending on whether light is interrupted according to Comparative Examples 1 and 2 and the embodiment. 
     
       
         
           
               
               
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                   
                 Red  
                 Green  
                 Blue  
               
               
                   
                   
                 Subpixel 
                 Subpixel 
                 Subpixel 
               
               
                   
                   
               
             
            
               
                   
                 Comparative 
                 72% 
                 93% 
                 94% 
               
               
                   
                 Example 1 
                   
                   
                   
               
               
                   
                 Comparative 
                 77% 
                 93% 
                 94% 
               
               
                   
                 Example 2 
                   
                   
                   
               
               
                   
                 Embodiment 
                 94% 
                 94% 
                 94% 
               
               
                   
                   
               
            
           
         
       
     
     In Table 1, Comparative Example 1 represents a touch display device not including the red, green and blue openings  152   r ,  152   g  and  152   b , Comparative Example 2 represents a touch display device including only the red opening  152   r , and the embodiment represents a touch display device including the red opening  152   r , which is formed by completely removing the touch electrode  150  that is disposed at the lower end of the red (R) subpixel SP, and the green opening  152   g , which has a smaller line width than the red opening  152   r , but not including the blue opening  152   b , as shown in  FIG. 6A . As can be seen in Table 1, in Comparative Examples 1 and 2, the proportion of the emission area in the red (R) subpixel SP depending on whether light is interrupted by the touch electrode  150  is lower than the proportions of the emission areas in the green (G) and blue (B) subpixels SP, whereby the color coordinates vary. On the other hand, according to the embodiment, the proportions of the emission areas in the red (R), green (G) and blue (B) subpixels SP are constant, whereby variation in the color coordinates may be prevented. 
     In addition, according to the present invention, the touch electrodes  150  have therein the openings  152   r ,  152   g  and  152   b , thereby reducing the capacitance of the parasitic capacitor between the touch electrodes  150  and the cathode  126  of the light-emitting element  120 . 
     The present invention has been described by way of example as having a structure in which the openings  152   r ,  152   g  and  152   b  are formed in the touch electrodes  150 . However, the openings  152   r ,  152   g  and  152   b  may also be formed in the touch lines  160  in the vertical direction disposed between the touch electrodes  150  shown in  FIG. 8A  and the touch lines  160  in the horizontal direction disposed between the touch electrodes  150  shown in  FIG. 8B . The openings  152   r ,  152   g  and  152   b  are disposed in the touch lines  160  located at the lower ends of the subpixels SP surrounded by the touch lines  160 . Accordingly, the proportions of the emission areas in the red (R), green (G) and blue (B) subpixels SP corresponding to the touch lines  160  depending on whether light is interrupted by the touch lines  160  are constant, thereby preventing variation in the color coordinates. 
     The touch lines  160  according to the present invention have been described by way of example as extending to the touch pad  170  through the bezel area, as shown in  FIG. 3 . However, as shown in  FIG. 9 , the touch lines  160  may extend to the touch pad  170  through the non-emission area between the touch electrodes  150 . 
     The present invention has been described by way of example as having a structure in which the green subpixel has a larger emission area than the red subpixel and has a smaller emission area than the blue subpixel. However, the present invention is not limited thereto. For example, the red subpixel may have a larger emission area than the green (blue) subpixel and may have a smaller emission area than the blue (green) subpixel. Alternatively, the blue subpixel may have a larger emission area than the green (red) subpixel and may have a smaller emission area than the red (green) subpixel. 
     In addition, although a self-capacitance-type touch sensor structure has been described by way of example, the present invention can also be applied to a mutual-capacitance-type touch sensor structure. 
     As is apparent from the above description, in a touch display device according to the present invention, touch electrodes surrounding respective subpixels have therein openings, and the openings are formed to be inversely proportional to the sizes of the emission areas of the respective subpixels. Accordingly, the proportions of the emission areas in the subpixels depending on whether light is interrupted by the touch electrodes are similar to (the same as) each other, thereby minimizing viewing-angle-dependent variation in color coordinates. 
     In addition, owing to the openings formed in the touch electrodes, it is possible to reduce the capacitance of a parasitic capacitor between the touch electrodes and a cathode. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the touch display device of the present disclosure without departing from the technical idea or scope of the disclosure. Thus, it is intended that the present disclosure covers the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.