Patent Publication Number: US-2023134804-A1

Title: Display device

Description:
TECHNICAL FIELD 
     The present invention relates to a display device including a display panel in which a pattern including a light-emitting region for emitting light per pixel is provided on a display surface. 
     BACKGROUND ART 
     A conventional display device typically includes (sub) pixels of red color (R), green color (G), and blue color (B) and emit light per subpixel to display information. In such a conventional display device, not only a pixel arrangement of RGB, such as an existing stripe arrangement, but also a new pixel arrangement, such as a PenTile arrangement has been put into practical use (for example, see PTL 1 below). 
     CITATION LIST 
     Patent Literature 
     PTL 1: WO 2019/229854 Pamphlet 
     SUMMARY OF INVENTION 
     Technical Problem 
     The conventional display device as described above uses, for example, a vapor deposition method to form light-emitting regions of pixels of each color of R, G, and B. 
     Unfortunately, in the conventional display device, the pixels (light-emitting regions) of each color of R, G, and B are arranged in the PenTile arrangement, the stripe arrangement, or the like, and in a case of, for example, a positional offset of a vapor deposition mask to be used in the vapor deposition method, a color mixing occurrence region where color mixing occurs by a light-emitting material being vapor-deposited on a light-emitting region of another color cannot be reduced, and thus degradation of display quality cannot be prevented. 
     Solution to Problem 
     A display device according to one aspect of the present invention including a display region including a plurality of pixels includes a thin film transistor layer, and a light-emitting element layer in which a plurality of light-emitting elements is formed, the plurality of light-emitting elements including a first electrode, a light-emitting layer, and a second electrode and having a luminescent color different from each other. Each of the plurality of pixels is provided with a rectangular portion formed in a rectangular shape in a light-emitting region, a long side direction of the rectangular portion is inclined at an angle predetermined with respect to a first direction predetermined in the display region. In pixels of the same luminescent color of the plurality of pixels, the rectangular portions of two pixels adjacent to each other in the first direction or a second direction orthogonal to the first direction are provided at positions rotated by 90° with respect to each other, and in the plurality of pixels, a short side of each of the rectangular portions faces the light-emitting region of an adjacent pixel of a different luminescent color. 
     Advantageous Effects of Invention 
     According to an aspect of the present invention, a display device can be provided in which a color mixing occurrence region can be reduced so as to prevent display quality from being reduced even in a case where a light-emitting region of each color is formed by using a vapor deposition method. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a plan view illustrating patterns and openings formed in a display region of a display device according to a first embodiment. 
         FIG.  2    is a cross-sectional view representing a configuration of the display device. 
         FIG.  3    is an enlarged plan view of the patterns and the openings. 
         FIG.  4    is an enlarged plan view of a main part for describing details of the openings. 
         FIG.  5    is an enlarged plan view for describing color mixing when the patterns are formed offset. 
         FIG.  6    is an enlarged plan view for describing penetration of the patterns into other color pixels at the time of the color mixing. 
         FIG.  7    is an enlarged plan view of patterns according to a comparative example. 
         FIG.  8    is an enlarged plan view for describing penetration of the patterns according to the comparative example into other color pixels at the time of color mixing. 
         FIG.  9    is a plan view illustrating patterns and openings formed in a display region of a display device according to a second embodiment. 
         FIG.  10    is an enlarged plan view of a main part for describing details of an opening. 
         FIG.  11    is a plan view illustrating patterns and openings formed in a display region of a display device according to a third embodiment. 
         FIG.  12    is an enlarged plan view of a main part for describing details of the openings. 
         FIG.  13    is a plan view illustrating patterns and openings formed in a display region of a display device according to a fourth embodiment. 
         FIG.  14    is an enlarged plan view of a main part for describing details of the opening. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
       FIG.  1    is a plan view illustrating a first pattern  3 R, a second pattern  3 G, a third pattern  3 B, a first opening  4 R, a second opening  4 G, and a third opening  4 B formed in a display region  2  of a display device  1  according to a first embodiment.  FIG.  2    is a cross-sectional view representing a configuration of the display device  1 .  FIG.  3    is an enlarged plan view of the patterns and the openings.  FIG.  4    is an enlarged plan view of a main part for describing details of the first opening  4 R, the second opening  4 G, and the third opening  4 B. 
     The display device  1  includes the display region  2  including a plurality of red pixels Rpix (red color pixels), green pixels Gpix (green color pixels), and blue pixels Bpix (blue color pixels). An Organic Light Emitting Diode (OLED), which constitutes a pixel for displaying an image, is provided in the display region  2 . 
     The display device  1  includes a Thin Film Transistor (TFT) substrate  30 . The TFT substrate  30  is prepared by forming, on a light-transmitting support substrate  31  such as mother glass, a resin layer (not illustrated) and a barrier layer (not illustrated), forming, on the layers, a TFT  32  (a thin film transistor layer) included in a pixel circuit provided on each pixel pix and various types of wiring lines  33  including a gate wiring line and a source wiring line by a known method, forming a passivation film (protection film)  34 , an interlayer insulating film (flattening film)  35 , and the like, and further forming, on the interlayer insulating film  35 , 
     an anode electrode (a reflective electrode layer)  36  being in contact with an anode and a pixel bank  39  for defining a ITO layer and a light-emitting region. 
     Examples of the material of the resin layer (not illustrated) include polyimide, epoxy, and polyamide. 
     The barrier layer (not illustrated) is a layer that inhibits moisture and impurities from reaching the TFT  32  and an EL layer  40  (light-emitting element layer) when the display device  1  is used and can be formed by a silicon oxide film, a silicon nitride film, a silicon oxynitride film, or a layered film thereof formed by, for example, chemical vapor deposition (CVD). 
     The TFT  32  is a drive transistor for supplying a drive current to the EL layer  40 . While not illustrated, the TFT  32  has a semiconductor layer, a gate electrode, a drain electrode, and a source electrode. 
     The passivation film  34  is formed so as to cover the TFT  32 . Thus, the passivation film  34  prevents peeling of a metal film in the TFT  32  and protects the TFT  32 . The passivation film  34  is an inorganic insulating film made of silicon nitride, silicon oxide, or the like. 
     The interlayer insulating film  35  is formed on the passivation film  34 . The interlayer insulating film  35  is a flattening film for leveling irregularities on the passivation film  34 . The interlayer insulating film  35  is an organic insulating film including a photosensitive resin such as acrylic and polyimide. 
     An anode electrode  36  (first electrode) is individually patterned in an island shape for each pixel pix, with an end portion of the anode electrode  36  covered by the pixel bank  39 . Each anode electrode  36  is connected to the TFT  32  via a contact hole provided in the passivation film  34  and the interlayer insulating film  35 . 
     The anode electrode  36  functions as an electrode for injecting holes into the EL layer  40 . Further, in the present embodiment, the anode  36  has a structure in which a light-transmissive electrode  38  is laminated on a reflective film  37 . Note that the anode electrode  36  may be a single layer structure including the reflective film  37  or may be layered with other layers other than the light-transmissive electrode  38 . 
     Examples of materials of the reflective film  37  include, for example, a black electrode material such as tantalum (Ta) or Carbon®, a reflective metal electrode material such as Al, Ag, gold (Au), Al—Li alloy, Al-neodymium (Nd) alloy, alloy containing Ag, or Al-silicon (Si) alloy. 
     As examples of materials of the light-transmissive electrode  38  include, for example, a transparent electrode material such as indium tin oxide (ITO), tin oxide (SnO 2 ), indium zinc oxide (IZO), gallium-added and zinc oxide (GZO) may be utilized, and a semitransparent electrode material such as a thin film of Ag may be utilized. 
     The pixel bank  39  (edge cover film) is disposed so as to partition the pixels adjacent to each other. The pixel bank  39  is an insulating layer, and is made, for example, from a photosensitive resin. The pixel bank  39  is formed to cover an edge of the anode electrode  36  and define the light-emitting region by an opening. The pixel bank  39  functions as an edge cover that prevents short circuiting between the end of the anode electrode  36  and 
     a cathode electrode  47  even when the end of the EL layer  40  is thin. In addition, the pixel bank  39  functions also as a pixel separation film configured to prevent electric current from leaking out from one pixel pix to an adjacent pixel pix. 
     In addition, at the time of forming an active area, a frame-shaped bank (not illustrated)) surrounding the active area in a frame-like shape is also formed on the TFT substrate  30 . The frame-shaped bank includes a photosensitive resin such as an acrylic or a polyimide. 
     The EL layer  40  and the cathode electrode  47  (second electrode) are formed on the TFT substrate  30 . 
     For example, a hole injection layer  41 , a hole transport layer  42 , a light-emitting layer  43 , a hole shielding layer  44 , and an electron transport layer  45  and an electron injection layer  46  are layered on the TFT substrate  30  in this order from the anode electrode  36  side by vapor deposition or the like. In this way, the EL layer  40  is formed on the TFT substrate  30 . The cathode electrode  47  is formed so as to cover the EL layer  40  formed on the TFT substrate  30 . 
     The hole transport layer  42  and the light-emitting layer  43  are formed in the island shape for each pixel pix by vapor deposition using a vapor deposition mask, and the hole injection layer  41 , the hole shielding layer  44 , the electron transport layer  45 , the electron injection layer  46 , and the cathode electrode  47  are each configured in a solid-like common layer formed across a plurality of the pixels pix, as illustrated in the drawings. Further, it is also possible to adopt a configuration in which one or more layers of the hole injection layer  41 , the hole shielding layer  44 , the electron transport layer  45 , and the electron injection layer  46  are not formed. 
     Note that a layer vapor-deposited for each pixel pix by using the vapor deposition mask, such as the hole transport layer  42  and the light-emitting layer  43 , is referred to as a deposition layer. 
     The cathode electrode  47  is constituted by a light-transmitting conductive material such as Indium Tin Oxide (ITO) and Indium Zinc Oxide (IZO) or a semitransparent conductive material formed of Ag or Mg. 
     The light-emitting layer  43  and the hole transport layer  42  are formed on the pixel pix for each luminescent color of the pixel pix. For example, in a case where the pixel pix is any of the red pixel Rpix that emits red light, the green pixel Gpix that emits green light, and the blue pixel Bpix that emits blue light, a red light-emitting layer  43 R and a red hole transport layer  42 R are formed in the red pixel Rpix, a green light-emitting layer  43 G and a green hole transport layer  42 G are formed in the green pixel Gpix, and a blue light-emitting layer  43 B and a blue hole transport layer  42 B are formed in the blue pixel Bpix. 
     The hole injection layer  41  includes a hole injection material and has a function to increase the efficiency of injecting a hole into the light-emitting layer  43 . 
     The hole transport layer  42  includes a hole transport material and has a function to enhance the efficiency of transporting a positive hole, which is injected from the anode electrode  36  and transported via the hole injection layer  41 , into light-emitting layer  43 . The red hole transport layer  42 R increases the efficiency of transporting a positive hole to the red light-emitting layer  43 R, the green hole transport layer  42 G increases the efficiency of transporting a positive hole to the green light-emitting layer  43 G, and the blue hole transport layer  42 B increases the efficiency of transporting a positive hole to the blue light-emitting layer  43 B. 
     The hole shielding layer  44  includes a material preventing movement of the positive hole and prevents the positive hole from being transported to the electron transport layer  45  through the light-emitting layer  43 . 
     The electron injection layer  46  includes an electron injection material and has a function to increase the efficiency of injecting an electron into the light-emitting layer  43 . The electron transport layer  45  includes an electron transport material and has a function to increase the efficiency of transporting an electron to the light-emitting layer  43 . 
     A positive hole injected from the anode electrode  36  into the light-emitting layer  43  and an electron injected from the cathode electrode  47  into the light-emitting layer  43  are recombined in the light-emitting layer  43  to form an exciton. The formed exciton emits light when deactivated from the excited state to the ground state. As a result, the red light-emitting layer  43 R emits red light, the green light-emitting layer  43 G emits green light, and the blue light-emitting layer  43 B emits blue light. 
     The red hole transport layer  42 R, the red light-emitting layer  43 R, the green hole transport layer  42 G, the green light-emitting layer  43 G, the blue hole transport layer  42 B, and the blue light-emitting layer  43 B are each formed on the pixel pix sequentially by using the vapor deposition mask in a vapor deposition step. The vapor deposition mask used in the vapor deposition step is prepared for each luminescent color before the vapor deposition step. 
     The layer formed by using the vapor deposition mask is not limited to the hole transport layer  42  and the light-emitting layer  43  and may be any layer formed for each pixel pix (namely, in the opening of the pixel bank  39 ). 
     Although the case where the light-emitting element layer including the anode  36 , the EL layer  40 , and the cathode  47  constitutes the OLED element is described, the light-emitting element layer is not limited to the case to constitute the OLED element and may constitute an inorganic light-emitting diode or a quantum dot light-emitting diode. 
     Then a sealing layer  25  is formed on the cathode electrode  47 . As an example, the sealing layer  25  can include a three layer structure in which an inorganic film, an organic film, and an inorganic film are layered in this order from the TFT substrate  30  side. Since the frame-shaped bank (not illustrated) is formed, the organic film can be formed to have a large thickness of, for example, 5 μm or greater. 
     A plurality of first patterns  3 R formed in the display region  2  is disposed in the plurality of red pixels Rpix to include a light-emitting region including a first opening  4 R (rectangular portion) formed in a rectangular shape in a plan view to emit red light. A plurality of the second patterns  3 G formed in the display region  2  is disposed in the plurality of green pixels Gpix to include a light-emitting region including a second opening  4 G (rectangular portion) formed in a rectangular shape to emit green light. A plurality of the third patterns  3 B formed in the display region  2  is disposed in the plurality of blue pixels Bpix to include a light-emitting region including a third opening  4 B (rectangular portion) formed in a rectangular shape to emit blue light. 
     The first opening  4 R, the second opening  4 G, and the third opening  4 B are arranged along a direction inclined at a predetermined angle with respect to an X direction (lateral direction, first direction) in a plan view. This predetermined angle is, for example, approximately 45° or approximately 135°. 
     The first openings  4 R of the two red pixels Rpix adjacent to each other in the X direction or the Y direction are provided at positions rotated by 90° from each other. The first openings  4 G of the two green pixels Gpix adjacent to each other in the X direction or the Y direction are also provided at positions rotated by 90° from each other, and the first openings  4 B of the two blue pixels Bpix adjacent to each other are also provided at positions rotated by 90° from each other. 
     One short side of the first opening  4 R of the red pixel Rpix faces a long side of the second opening  4 G of the adjacent green pixel Gpix, and the other short side faces a long side of the third opening  4 B of the adjacent blue pixel Bpix. Then, one short side of the first opening  4 G of the green pixel Gpix faces a long side of the third opening  4 B of the adjacent blue pixel Bpix, and the other short side faces a long side of the first opening  4 R of the adjacent red pixel Rpix. One short side of the third opening  4 B of the blue pixel Bpix faces a long side of the first opening  4 R of the adjacent red pixel Rpix, and the other short side faces a long side of the second opening  4 G of adjacent the green pixel Gpix. 
     The pixel bank  39  covers the edge of the anode electrode  36  and defines the light-emitting region by the first opening  4 R, the second opening  4 G, and the third opening  4 B. 
     However, the predetermined angle is not limited to approximately 45° or approximately 135° and may be, for example, 30° or 60° with respect to the X direction, and the adjacent pixels of the same color may have a relationship in which the rectangular portions are rotated by 90°. 
     The first opening  4 R, the second opening  4 G, and the third opening  4 B are formed in a rectangular shape in a plan view and are arranged in a staggered shape in which rectangles are obliquely displaced and regularly arranged in the vertical and horizontal directions. 
     Aspect ratios of the first opening  4 R, the second opening  4 G, and the third opening  4 B are preferably 2:1 or greater. 
     The first pattern  3 R, the second pattern  3 G, and the third pattern  3 B are also formed in a rectangular shape in a plan view, arranged along a direction inclined at 45° or 135° with respect to the X direction, and arranged in the staggered shape in which the rectangles are obliquely displaced and regularly arranged in the vertical and horizontal directions. 
     In the first embodiment, the opening ratio of each of the R, G, and B pixels is approximately 1:1:1. 
     As illustrated in  FIG.  4   , in the first embodiment, an aperture ratio NA of each of R, G, and B is L×Wn/(L+d)(Wn+d) where d is a dimension (distance between openings in the edge cover (color separation)) obtained by subtracting a dimension Wn of the first opening  3 R in the short side direction from a length of the first pattern  4 R in the short side direction, L is a dimension of a longitudinal opening width of each of the first opening  4 R, the second opening  4 G, and the third opening  4 B, and Wn is a dimension of a lateral opening width of each of the first opening  4 R, the second opening  4 G, and the third opening  4 B. Where, L+d:Wn+d=2:1. At this time, 
         L/Wn= 2+ d/Wn&gt; 2.  (Relationship 1), and
 
     L/Wn (aspect ratio of the opening) is greater than 2. 
       FIG.  5    is an enlarged plan view for describing color mixing when the first pattern  3 R, the second pattern  3 G, and the third pattern  3 B are formed offset.  FIG.  6    is an enlarged plan view for describing penetration of the first pattern  3 R, the second pattern  3 G, and the third pattern  3 B into other color pixels at the time of the color mixing.  FIG.  7    is an enlarged plan view of a first pattern  93 R, a second pattern  93 G, and a third pattern  93 B according to a comparative example.  FIG.  8    is an enlarged plan view for describing penetration of the first pattern  93 R, the second pattern  93 G, and the third pattern  93 B according to the comparative example into other color pixels at the time of the color mixing. 
     The first pattern  93 R, the second pattern  93 G, and the third pattern  93 B, and the first opening  94 R, the second opening  94 G, and the third opening  94 B are formed in a substantially square shape.  FIG.  7    illustrates an ideal state in which there is no positional offset of film formations of the first pattern  93 R, the second pattern  93 G, and the third pattern  93 B. As illustrated in  FIG.  8   , when the film formation position of the second pattern  93 G according to the comparative example is offset along the direction indicated by an arrow A inclined at  1350  with respect to the X direction, the second pattern  93 G intrudes into the first opening  94 R of the first pattern  93 R by an intrusion amount e. This causes the color mixing between the second pattern  93 G of green color and the first opening  94 R of red color, which is another color. Thus, a color mixing occurrence region indicating the degree of the second pattern  93 G intruding into the first opening  94 R of the first pattern  93 R appears. 
     In contrast, the first pattern  3 R, the second pattern  3 G, the third pattern  3 B, the first opening  4 R, the second opening  4 G, and the third opening  4 B according to the first embodiment are arranged in the staggered shape in which the rectangles are obliquely offset and regularly arranged in the vertical and horizontal directions. Thus, as illustrated in  FIGS.  5  and  6   , even when the film formation position of the second pattern  3 G is offset by the intrusion amount e along the direction indicated by the arrow A inclined at 135° with respect to the X direction, an area of the color mixing occurrence region indicating the degree of intrusion of the second pattern  3 G into the first opening  4 R of the first pattern  3 R is smaller than an area of the color mixing occurrence region according to the comparative example in  FIG.  8   . Accordingly, the color mixing occurrence region can be reduced, and the display quality of the display device  1  can be improved. 
     Assuming that the structure of the comparative example illustrated in  FIG.  8    has a higher color mixing area ratio at the time of color mixing (at the time of pattern offset) than the structure of the embodiment illustrated in  FIG.  6   , the edge of the long side of the opening of the pattern on the side to intrude is present on the same straight line as the edge of the short side of the opening of the pattern on the side to be intruded, and a relationship 
         e×Ws/Ws   2   &gt;e ×( Wn+d/ 2)/( Wn×L )
 
     is established where e is an intrusion amount of a pattern into an opening of an adjacent pattern, Ws is a dimension of an opening according to the comparative example, L is the longitudinal opening width of the first opening  4 R, the second opening  4 G, and the third opening  4 B, and Wn is the lateral opening width of the first opening  4 R, the second opening  4 G, and the third opening  4 B. 
     Here, in a case where the opening areas are matched between the structure of the comparative example and the structure of the embodiment, Ws 2 =(Wn×L) is established, and 
         Ws&gt;Wn+d/ 2 . . . is satisfied. 
     When both sides of the above relationship are squared and transformed (using Ws 2 =(Wn×L)), 
         Wn×L&gt;Wn   2   +Wn×d+d   2 /4 is obtained, 
     when both sides of the above relationship are divided by Wn 2  and (Relationship 1) described in the first embodiment is used 2+d/Wn&gt;1+d/Wn+d 2 /4Wn 2  is obtained, and the following is finally obtained. 
     Wn&gt;d/2 (Relationship 2). When the condition of (Relationship 2) is satisfied, the color mixing area at the time of color mixing is relatively smaller in the structure of the embodiment than in the structure of the comparative example. 
     Here, the dimension L of the longitudinal opening width is 29.3 μm, for example, and the dimension Wn of the lateral opening width is 7.7 μm, for example. The dimension d is 14 μm, for example. 
     The dimension Ws is 15 μm, for example. The aperture ratio of each opening according to the comparative example matches the aperture ratio of a corresponding opening according to the embodiment. In other words, Ws 2 =L×Wn. The intrusion amount e is 3 μm, for example. 
     An actual product of the display device  1  is affected by a variation in the manufacturing process, and the vapor deposition (film formation) pattern is finished variously offset to a greater or lesser extent. Thus, in a case where the color mixing is large (in a case where the positional offset of the film formation is large), the pattern is defective and the yield is lowered. In addition, in a case where the color mixing is small (in a case where the positional offset of the film formation is small), a color unevenness is formed to be present in the product of the display device  1 . 
     Here, although the color unevenness can be corrected in the manufacturing process (color unevenness correction), the color unevenness that is not corrected remains in the product within a range determined to be good quality. Accordingly, the structure of the present embodiment in which the ratio of the color mixing area is reduced leads to a reduction in the color unevenness thereof and can improve the display quality of the product itself of the display device  1 . 
     Furthermore, even when the color unevenness correction is completely performed, in a case where, for example, the green color pattern is mixed into a blue color pattern, luminance of blue color in which the light emission area is reduced is increased by the color unevenness correction process. Thus, although the color unevenness is corrected, luminance service life of the pixel with increased luminance is reduced due to voltage rise and current density increase. 
     Thus, the greater the color unevenness correction, the lower the luminance reduction (and luminance variation for each pixel) of the display device  1  in long-term use, and thus the smaller the ratio of the color mixing area is to improve the reliability of the display device  1 . 
     As a result of the above, it is possible to prove that the problem is solved by the present embodiment from the viewpoint of the display quality and reliability of the display device  1 . 
     Second Embodiment 
       FIG.  9    is a plan view illustrating patterns and openings formed in a display region  22  of a display device  21  according to a second embodiment.  FIG.  10    is an enlarged plan view of a main part for describing details of a third opening  24 B. Constituent elements similar to the constituent elements described above are given the same reference numerals, and detailed descriptions thereof are not repeated. 
     The display device  21  includes the display region  22 . The plurality of first pattern  3 R having a rectangular shape is disposed in the plurality of red pixels Rpix. A plurality of second pattern  23 G having a rectangular shape is disposed in the plurality of green pixels Gpix. Then, a plurality of third patterns  23 B having an L shape formed in the display region  22  is disposed in the plurality of the blue pixel Bpix to include a light-emitting region including the third opening  24 B formed in the L shape to emit blue light. 
     In this manner, the blue pixel Bpix is provided with the light-emitting region having the L shape formed of the third opening  24 B. The third opening  24 B having the L shape includes a base portion  48  (rectangular portion) formed in a rectangular shape and a protrusion  49  protruding from one short side in the orthogonal direction orthogonal to a long side of the base portion  48 . 
     A protruding length ΔW of the protrusion  49  is a value in a range from 0.1 times to 2 times the dimension Wn of the short side of the base portion  48 . In a case of 0.1 times or more, display quality of the display device  1  is improved. In a case of two times or less, color mixing caused by deposition of the light-emitting material on a light-emitting region of another color is prevented. 
     The third opening  24 B having the L shape of the blue pixel Bpix has a shape in which a third opening  24 B having the L shape of the blue pixel Bpix adjacent to the third opening  24 B having the L shape in the X direction or the Y direction is rotated by 90° and is mirror inverted so as to be line-symmetric with respect to a central axis along the long side of the base portion  48 . 
     The third pattern  23 B and the third opening  24 B are formed in the L shape in a plan view with respect to the display region  2 . The base portion  48  of the third opening  24 B extends along an inclination direction in which the extending direction of at least one of the base portions  48  of the adjacent third openings  24 B is rotated by 90°. 
     The first opening  4 R and a second opening  24 G are formed in a rectangular shape in a plan view. The first opening  4 R, the second opening  24 G, and the third opening  24 B are formed in a pattern shape in which the rectangular and the L shapes are obliquely displaced and regularly arranged in the vertical and horizontal directions. 
     In the second embodiment, the opening ratio of each of the R, G, and B pixels is X:Y:Z (Y&lt;X&lt;Z). 
     Then in the second embodiment, the aperture ratio NA of each luminescent color is NA®=L×Wn/(L+d)(Wn+d), NA(G)=(L−ΔW)×Wn/(L+d)(Wn+d), and NA(B)=(L+ΔW)×Wn/(L+d)(Wn+d). 
     Note that in the above description, the case is described in which the width dimension of the base portion  48  on the short side and the width dimension of the protrusion  49  are set to the same value, but the present embodiment is not limited thereto, and the values may be different values from each other. 
     Third Embodiment 
       FIG.  11    is a plan view illustrating patterns and openings formed in a display region  32  of a display device  31  according to a third embodiment.  FIG.  12    is an enlarged plan view of a main part for describing details of the openings. Constituent elements similar to the constituent elements described above are given the same reference numerals, and detailed descriptions thereof are not repeated. 
     The display device  31  includes the display region  32 . A plurality of the first patterns  33 R having the L shape formed in the display region  32  is disposed in the plurality of red pixels Rpix to include a light-emitting region including a first opening  34 R formed in the L shape. Then, a plurality of the third patterns  33 B having the L shape formed in the display region  32  is disposed in the plurality of blue pixels Bpix to include a light-emitting region including a third opening  34 B formed in the L shape. A second opening  24 G having a rectangular shape is disposed in each of the plurality of green pixels Gpix. 
     In this manner, the red pixel Rpix and blue pixel Bpix of the red pixel Rpix, green pixel Gpix, and blue pixel Bpix are respectively provided with the first opening  34 R and the third opening  34 B of the light-emitting regions having the L shape. 
     The first opening  34 R and the third opening  34 B of the light-emitting regions having the L shape in the pixels of two luminescent colors have the same dimensions of protruding lengths ΔW 3  and ΔW 4  of the protrusion  49  (protruding dimensions). The protruding lengths ΔW 3  and ΔW 4  of the protrusion  49  are values in a range from 0.1 times to 2 times the dimension Wn of the short side of the base portion  48 . 
     The third opening  34 B having the L shape of the blue pixel Bpix has a shape in which a third opening  34 B having the L shape of the blue pixel Bpix adjacent to the third opening  34 B having the L shape in the X direction or the Y direction is rotated by 90° and is mirror inverted so as to be line-symmetric with respect to a central axis along the long side of the base portion  48 . The first opening  34 R having the L shape of the red pixel Rpix also has a shape in which a first opening  34 R having the L shape of the red pixel Rpix adjacent to the first opening  34 R having the L shape in the X direction or the Y direction is rotated by 90° and is mirror inverted so as to be line-symmetric with respect to a central axis along the long side of the base portion  48 . 
     The third opening  34 B formed in the L shape includes, for example, a base portion  48  that extends along a direction inclined at 45° with respect to the X direction in a plan view, and a protrusion  49  that protrudes by a dimension ΔW 4  from one end of the base portion  48  toward a direction inclined at 135° with respect to the X direction. The first opening  34 R also includes a similar base  48  and a similar protrusion  49 . 
     The first pattern  33 R, the first opening  34 R, the third pattern  33 B and the third opening  34 B are formed in the L shape in a plan view with respect to the display region  2 . The base portion  48  of the first opening  34 R extends along an inclination direction in which the extending direction of at least one of the base portions  48  of the adjacent first openings  34 R is rotated by 90°. The base portion  48  of the third opening  34 B extends along an inclination direction in which the extending direction of at least one of the base portions  48  of the adjacent third openings  34 B is rotated by 90°. 
     The second opening  24 G is formed in a rectangular shape in a plan view. The first opening  34 R, the second opening  24 G, and the third opening  34 B are formed in a pattern shape in which the rectangular and the L shapes are obliquely displaced and regularly arranged in the vertical and horizontal directions. 
     In the third embodiment, in a case of ΔW 3 =ΔW 4 =AW, the opening ratio of each of the R, G, and B pixels is X:Y:X (Y&lt;X). 
     In the third embodiment, the aperture ratio NA of each luminescent color is NA®=(L+ΔW 3 )×Wn/(L+d)(Wn+d), NA(G)=(L−ΔW 3 −ΔW 4 )×Wn/(L+d). (Wn+d), and NA(B)=(L+ΔW 4 )×Wn/(L+d)(Wn+d). 
     Note that in the above description, the case is described in which the width dimension of the base portion  48  on the short side and the width dimension of the protrusion  49  are set to the same value, but the present embodiment is not limited thereto, and the values may be different values from each other. 
     Fourth Embodiment 
       FIG.  13    is a plan view illustrating patterns and openings formed in a display region  42  of a display device  41  according to a fourth embodiment.  FIG.  14    is an enlarged plan view of a main part for describing details of the opening. Constituent elements similar to the constituent elements described above are given the same reference numerals, and detailed descriptions thereof are not repeated. 
     The display device  41  includes the display region  42 . Each of the plurality of the blue pixels Bpix is provided with the light-emitting region including the third opening  44 B formed in an S shape. 
     The third opening  44 B having the S shape includes a base portion  48  (rectangular portion) formed in a rectangular shape, a first protrusion  50  protruding from one short side in one orthogonal direction of orthogonal directions orthogonal to a long side of the base portion  48 , and a second protrusion  51  protruding from the other short side in the other orthogonal direction of the orthogonal directions orthogonal to the long side of the base portion  48 . 
     The third opening  44 B having the S shape has a shape in which a third opening  44 B having the S shape of the blue pixel Bpix having the S shape adjacent in the X direction or the Y direction is rotated by 90° and is mirror inverted so as to be line-symmetric with respect to a central axis along the long side of the base portion  48 . 
     A protruding length ΔW 1  of the first protrusion  50  and a protruding length ΔW 2  of the second protrusion  51  are values in a range from 0.1 times to 2 times the dimension Wn of the short side length of the short side of the base portion  48 . 
     The protruding length ΔW 1  of the first protrusion  50  and the protruding length ΔW 2  of the second protrusion  51  are the same. 
     The display device  41  includes first patterns  3 R having a rectangular shape including a first opening  4 R formed in a rectangular shape, second patterns  43 G having a rectangular shape including a second opening  44 G formed in a rectangular shape, and a plurality of third patterns  43 B having a substantially S shape formed on the display region  42  to include a third opening  44 B formed in a substantially S shape. 
     The first opening  4 R and the second opening  44 G formed in a rectangular shape are arranged along a direction inclined at 45° or 135° with respect to the X direction in a plan view. 
     The base portion  48  of the third opening  44 B formed in the substantially S shape is arranged along an inclination direction in which an inclination direction of at least one of the base portions  48  of the adjacent third openings  44 B is rotated by 90°. The first opening  4 R formed in a rectangular shape is arranged along an inclination direction in which an inclination direction of at least one of the adjacent first openings  4 R is rotated by 90°. The second opening  44 G is also arranged along an inclination direction in which an inclination direction of at least one of the adjacent second openings  44 G is rotated by 90°. 
     The first opening  4 R, the second opening  44 G, and the third opening  44 B are formed in a pattern shape in which the rectangular and the substantially S shapes are obliquely displaced and regularly arranged in the vertical and horizontal directions. 
     In the fourth embodiment, in a case of ΔW 1 =ΔW 2 =AW, the opening ratio of each of the R, G, and B pixels is X:X:Y (X&lt;Y). 
     In the fourth embodiment, the aperture ratio NA of each luminescent color is NA®=(L+ΔW 2 )×Wn/(L+d)(Wn+d), NA(G)=(L−ΔW 1 )×Wn/(L+d). (Wn+d), and NA(B)=(L+ΔW 1 +ΔW 2 )×Wn/(L+d)(Wn+d). 
     Additionally, in the second embodiment illustrated in  FIG.  9   , the third embodiment illustrated in  FIG.  11   , and the fourth embodiment illustrated in  FIG.  13   , the protruding length ΔW of the third opening  24 B having the L shape, the protruding length ΔW 3  of the first opening  34 R having the L shape, the protruding length ΔW 4  of the third opening  34 B having the L shape, and the first protruding length ΔW 1  and the second protruding length ΔW 2  of the third opening  44 B are each made different, and thus the ratio of any aperture ratio NA for each luminescent color can be obtained. 
     The present invention is not limited to each of the embodiments described above, and various modifications may be made within the scope of the claims. Embodiments obtained by appropriately combining technical approaches disclosed in each of the different embodiments also fall within the technical scope of the present invention. Furthermore, novel technical features can be formed by combining the technical approaches disclosed in each of the embodiments. 
     REFERENCE SIGNS LIST 
     
         
           1  Display device 
           2  Display region 
           3 R First pattern 
           3 G Second pattern 
           3 B Third pattern 
           4 R First opening (rectangular portion, light-emitting region) 
           4 G Second opening (rectangular portion, light-emitting region) 
           4 B Third opening (rectangular portion, light-emitting region) 
           32  TFT (thin film transistor layer) 
           36  Anode electrode (first electrode) 
           39  Pixel bank (edge cover film) 
           40  EL layer (light-emitting element layer) 
           43  Light-emitting layer 
           47  Cathode electrode (second electrode) 
           48  Base portion (rectangular portion) 
           49  Protrusion 
           50  First protrusion 
           51  Second protrusion 
         ΔW Protruding length (protruding dimension) 
         ΔW 1  First protruding length 
         ΔW 2  Second protruding length 
         ΔW 3  Protruding length 
         ΔW 4  Protruding length 
         L Dimension 
         Wn Dimension 
         Rpix Red pixel (red color pixel) 
         Gpix Green pixel (green color pixel) 
         Bpix Blue pixel (blue color pixel)