JP2010165587A - Organic electroluminescent display device and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a light-emitting layer by a mask vapor deposition method without increasing the number of deposition cycles and lowering the strength of the mask. <P>SOLUTION: Pixel groups PXG are repeatedly laid out in the horizontal direction. A first color which is located in a first sub-pixel SP1 in the first pixel PX1 is located in a second sub-pixel SP2 in a second pixel PX2 and in a third sub-pixel SP3 in a third pixel PX3. A second color which is located in a second sub-pixel SP2 in the first pixel PX1 is located in a third sub-pixel SP3 in the second pixel PX2 and in the first sub-pixel SP1 in the third pixel PX3. A third color which is located in a third sub-pixel SP3 in the first pixel PX1 is located in the first sub-pixel SP1 in the second pixel PX2 and in the second sub-pixel SP2 in the third pixel PX3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an organic electroluminescence display device and a manufacturing method thereof.

  A method of manufacturing an organic electroluminescence display device (hereinafter referred to as “organic EL display device”) including forming a light emitting layer by a mask vapor deposition method is known (Patent Document 1). In the mask vapor deposition method, vapor deposition is performed for each color, and vapor deposition is performed three times to form a light emitting layer of three colors. Between the opening of the mask, there is a portion having a width corresponding to the light emitting layer for two colors.

JP 2002-47560 A

  In recent years, it has been required to form a light emitting layer minutely for high definition. When the width of the opening of the mask is reduced in order to reduce the width of the light emitting layer, the width of the portion between the opening and the opening is correspondingly reduced, and the strength of the mask is reduced. On the other hand, if the width of the opening is reduced while the width of the portion between the openings is increased, one color light emitting layer cannot be formed at a time, and four or more times are required to perform the three colors of vapor deposition. The number of deposition processes is required.

  An object of the present invention is to form a light emitting layer by a mask vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask.

  (1) The organic EL display device according to the present invention includes a plurality of rows of light emitting layers having a light emission color of three colors of a first color, a second color, and a third color and forming a stripe arrangement, , Including a plurality of sub-pixels each emitting light by energy generated by an electric field, the sub-pixels of the same color arranged in the vertical direction, the sub-pixels of the three colors arranged in the horizontal direction, and the first first arranged in the horizontal direction A subpixel, a second second subpixel, and a third third subpixel constitute one pixel, and the first pixel, the second pixel, and the third pixel arranged in the horizontal direction constitute a pixel group. The pixel groups are repeatedly arranged in the horizontal direction, and in the pixel group, the arrangement order of the sub-pixels of the three colors in each pixel is different, and the first pixel The first color located in one subpixel is located in the second subpixel in the second pixel, in the third subpixel in the third pixel, and in the second subpixel in the first pixel. The second color located at the second pixel is located at the third subpixel at the second pixel, located at the first subpixel at the third pixel, and located at the third subpixel at the first pixel. The third color may be located in the first subpixel at the second pixel and located in the second subpixel at the third pixel.

  According to the present invention, the first color located in the first subpixel in the first pixel is located in the third subpixel in the third pixel. That is, the colors of the subpixels at both ends of the pixel group are the same. Therefore, since the colors of adjacent subpixels in a pair of adjacent pixel groups are the same, two rows of light emitting layers can be formed by one opening of the mask, and the width of the opening is increased. Therefore, the width of the portion between the openings can be increased. In other words, even a high-definition mask with a narrow opening can secure a width necessary for strength. Therefore, the light emitting layer can be formed by a mask vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask.

  (2) In the organic EL display device according to (1), adjacent subpixels of a pair of pixels adjacent to each other in the horizontal direction are the same color, and the three colors are green, red, and blue. In addition, an interval between the subpixels adjacent to each other between the green colors and the red color may be wider than an interval between the subpixels adjacent to each other between the blue colors.

  (3) In the organic EL display device according to (1), the adjacent subpixels of the pair of pixels adjacent to each other in the horizontal direction are made of the same color, and one of the three colors is green. An interval between the sub-pixels adjacent to each other in green may be wider than an interval between the sub-pixels adjacent to each other in other colors.

  (4) The manufacturing method of the organic EL display device according to the present invention includes a step of forming a plurality of light emitting layers having three emission colors and a stripe arrangement by vapor deposition using a mask, and the light emitting layers in each column Includes a plurality of sub-pixel portions that emit light by energy generated by an electric field, and the step includes arranging the first color so that the sub-pixels of the same color are arranged in the vertical direction and the sub-pixels of the three colors are arranged in the horizontal direction. A first step of forming the light emitting layer, a second step of forming the light emitting layer of a second color, and a third step of forming the light emitting layer of a third color, and the mask includes: Alternately having two rows of openings for forming a film having a width corresponding to two rows of the light emitting layers in the lateral direction and one row of openings for forming one row of the light emitting layers, Between the two rows of openings and the one row of openings, there are three rows of the light emitting layers. There is a three-row shielding portion that shields a region to be formed, and the second step is performed after the first step. In the second step, the mask arranged in the first step is used as the two-row opening portion. And the deposition is performed by moving along the arrangement direction of the first row openings so that the second row openings are located adjacent to the position of the first row openings arranged in the first step. The third step is performed after the second step, and in the third step, the mask disposed in the second step is moved along the arrangement direction of the second row openings and the first row openings. Further movement is performed so that the first row opening is located adjacent to the position of the second row opening arranged in the first step and the position of the two row opening arranged in the second step. The vapor deposition is performed.

  According to the present invention, two rows of light emitting layers can be formed by one two-row opening of the mask, and the width of the two-row opening is increased. The width of the part can be increased. In other words, even a high-definition mask having a narrow two-row opening and a single-row opening can secure a width necessary for strength. Therefore, the light emitting layer can be formed by a mask vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask.

  (5) The organic EL display device according to the present invention includes a plurality of light emitting layers arranged in a plurality of rows and a plurality of columns, each of which has a light emission color of each of the first color, the second color, and the third color. The light emitting layer includes three subpixels that emit light by energy generated by an electric field, and the three subpixels of the first color, the second color, and the third color form one pixel in a delta arrangement. The light emitting layer arranged in the nth row and the light emitting layer arranged in the (n + 1) th row are arranged with a deviation of ½ of the width of one light emitting layer in the direction along the row. In the light emitting layer of the eye and the (n + 1) th row, a positive pixel in a normal delta arrangement in which one subpixel is arranged at each vertex of a triangle, and one subpixel is arranged at each vertex of an inverted triangle. The reverse pixel of the reverse delta sequence Are alternately arranged, and the first positive pixel, the second positive pixel, and the third positive pixel of the positive delta arrangement, and the first reverse pixel, the second reverse pixel, and the third reverse pixel of the reverse delta arrangement, The six pixels comprising the pixel group constitute a pixel group, the pixel groups are repeatedly arranged, and in the pixel group, the arrangement order of the three sub-pixels in the positive pixel is different, and the first positive pixel The first color located at the first positive vertex is located at the second positive vertex adjacent to the second positive pixel in the first direction among the counterclockwise and clockwise directions of the first positive vertex, The second color of the positive pixel located at the third positive vertex adjacent to the second positive vertex around the first direction of the second positive vertex, and located at the second positive vertex of the first positive pixel is the second positive pixel. In the third positive The third color located at the point, located at the first positive vertex at the third positive pixel, and located at the third positive vertex at the first positive pixel is the first positive pixel at the second positive pixel. The third positive pixel is positioned at the second positive vertex, and in the pixel group, the arrangement order of the sub-pixels of the three colors in the reverse pixel is different, and the first reverse pixel is the first pixel. The first color located at one reverse vertex is located at the second reverse vertex adjacent to the second reverse pixel around a second direction opposite to the first direction of the first reverse vertex, The second color of the reverse pixel located at the third reverse vertex adjacent to the second reverse vertex around the second direction of the second reverse vertex, and located at the second reverse vertex of the first reverse pixel is the second reverse pixel. Is located at the third inverse vertex, and is located at the first inverse vertex at the third inverse pixel. The third color located at the third reverse vertex of the first reverse pixel is located at the first reverse vertex of the second reverse pixel, and is located at the second reverse vertex of the third reverse pixel. It is characterized by doing.

  According to the present invention, since the light emitting layer includes three sub-pixels, the width of the opening of the mask for forming the sub-pixel is increased, so that the width of the portion between the openings can be increased. In other words, even a high-definition mask with a narrow opening can secure a width necessary for strength. Therefore, the light emitting layer can be formed by a mask vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask.

  (6) In the organic EL display device described in (5), each of the light emitting layers may be formed so that an upper surface has an oval shape.

  (7) In the organic EL display device described in (5), each of the subpixels may be formed so that an upper surface thereof is circular.

  (8) In the organic EL display device described in (5), the plurality of sub-pixels configured by one light-emitting layer as a whole have a shape in which an upper surface has a shape obtained by separating an oval shape into a plurality of shapes. It may be a feature.

  (9) In the method for manufacturing an organic EL display device according to the present invention, a plurality of light-emitting layers each having three colors, the first color, the second color, and the third color, are formed by vapor deposition using a mask. Each of the light emitting layers includes a plurality of subpixels that emit light by energy generated by an electric field, and the steps include a first step of forming the light emitting layer of a first color, and the second color of the light emitting layer. A second step of forming a light emitting layer and a third step of forming the light emitting layer of a third color, wherein the mask has a plurality of openings arranged in a plurality of rows and a plurality of columns, and each opening Has a width for forming the three subpixels along the row, and a region for forming the six subpixels between the openings adjacent to each other in the direction along the row. There is a shielding part that shields, and the opening arranged in the nth row is n It is arranged at a position shifted from the center of the shielding part of the first row to the nth row, the second step is performed after the first step, and the second step is arranged in the first step. The deposition is performed by moving the mask along the row so that the opening is positioned adjacent to the position of the opening disposed in the first step, and after the second step, A third step is performed, and in the third step, the mask arranged in the second step is arranged in the second step along the row and the position of the opening arranged in the first step. Further, the vapor deposition is performed by moving further so that the opening is located adjacently between the positions of the openings.

  According to the present invention, the light emitting layers of three colors can be formed in a plurality of rows and a plurality of columns. In each row, the light emitting layers of three colors are repeatedly arranged in a certain order. Then, the light emitting layers of other colors are located shifted to the (n + 1) th row from the center of the two color light emitting layers arranged adjacent to the nth row. That is, the light emitting layers of three colors are delta arranged. Therefore, a pixel in a delta arrangement is formed by two color subpixels adjacent to each other in the row direction and another color subpixel in the adjacent row. Here, since one opening has a width for forming three sub-pixels, the width of the opening is increased, so that the width of the portion between the openings can be increased. In other words, even a high-definition mask with a narrow opening can secure a width necessary for strength. Therefore, the light emitting layer can be formed by a mask vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask.

1 is a perspective view showing a basic structure of an organic EL display device according to a first embodiment of the present invention. It is the II-II sectional view taken on the line of the organic electroluminescence display shown in FIG. It is a figure explaining the arrangement | sequence of the sub pixel of the organic electroluminescence display which concerns on 1st Embodiment. It is a figure explaining the manufacturing method of the organic electroluminescence display concerning a 1st embodiment. It is an enlarged view explaining the opening part of a mask. It is a figure which shows the light emitting layer formed using the mask. It is a figure explaining the modification 1 of the organic electroluminescence display which concerns on 1st Embodiment. It is a figure explaining the modification 2 of the organic electroluminescence display which concerns on 1st Embodiment. It is a figure explaining the arrangement | sequence of the light emitting layer of the organic electroluminescence display which concerns on the 2nd Embodiment of this invention. It is a figure explaining the arrangement | sequence of the sub pixel of the organic electroluminescence display which concerns on the 2nd Embodiment of this invention. It is a figure which shows the mask used with the manufacturing method of the organic electroluminescence display which concerns on 2nd Embodiment. It is a figure explaining the modification of the organic electroluminescence display concerning a 2nd embodiment. It is a figure which shows the mask for forming the light emitting layer which concerns on the modification of 2nd Embodiment. It is a figure which shows the sub pixel formed from the light emitting layer shown in FIG. It is a figure which shows the other sub pixel formed from the light emitting layer shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a perspective view showing a basic structure of an organic EL display device according to a first embodiment of the present invention. 2 is a cross-sectional view of the organic EL display device shown in FIG. 1 taken along the line II-II.

  The organic EL display device has a substrate 10. In the case of a bottom emission type organic EL display device, the substrate 10 is made of a light-transmitting material such as glass. However, in the case of a top emission type organic EL display device, whether the substrate 10 has light transmittance or not is questioned. Absent.

  The organic EL display device shown in FIG. 2 is a top emission type, and a plurality of reflective layers 12 made of metal or the like are formed on a substrate 10. Light is reflected by the reflective layer 12 to display on the upper surface. If it is a bottom emission type organic EL display device, there is no reflective layer 12.

  A plurality of pixel electrodes 14 (lower electrodes) are formed on the substrate 10. The pixel electrode 14 is made of a light transmissive material such as ITO (Indium Tin Oxide). Note that a plurality of thin film transistors (not shown) serving as switches for the plurality of pixel electrodes 14 are formed on the substrate 10, and a drive circuit (not shown) for driving the plurality of thin film transistors (not shown) is formed. In addition, a wiring (not shown) electrically connected to the thin film transistor (not shown), the pixel electrode 14 and the driving circuit (not shown) is formed.

  Banks 16 are formed on the substrate 10. The bank 16 may be formed of an inorganic material, an organic material, or an inorganic material layer and an organic material layer provided thereon. The bank 16 surrounds at least a part of each pixel electrode 14. The bank 16 is placed on the end of each pixel electrode 14. That is, a part (center part) of the pixel electrode 14 is exposed from the bank 16.

  A light emitting layer 18 made of, for example, an organic material is formed above the pixel electrode 14. The light emitting layer 18 emits light upon receiving energy from an electric field or current. A plurality of rows of light-emitting layers 18 that emit light in each of the first, second, and third colors are arranged in stripes (see FIG. 1). Specifically, as shown in FIG. 2, the adjacent light emitting layers 18 may overlap at the ends. The light emitting layers 18 adjacent to each other have different emission colors.

  A hole transport layer 20 is provided between the pixel electrode 14 and the light emitting layer 18. The hole transport layer 20 is formed so as to continuously cover the plurality of pixel electrodes 14 and cover the bank 16. Further, depending on the color of the light emitting layer 18, a second hole transport layer 22 is provided on the hole transport layer 20 to adjust the film thickness.

  An electron transport layer 24 is formed on the light emitting layers 18 in a plurality of rows. An electron injection layer 26 is formed on the electron transport layer 24. A counter electrode 28 (upper electrode) is formed above the light emitting layer 18. The counter electrode 28 is made of a light transmissive material such as Indium Zinc Oxide.

  An auxiliary wiring 30 is formed on the counter electrode 28. The auxiliary wiring 30 is formed above the bank 16 so as not to disturb the display.

  The organic EL display device has a sealing member 32. The sealing member 32 is made of glass, for example. The sealing member 32 is for sealing a region (display region) in which a plurality of rows of light emitting layers 18 are arranged, and is attached to a peripheral region outside the display region. An adhesive may be used for the mounting seal 34 (see FIG. 1). A desiccant (not shown) is attached to the surface of the sealing member 32 on the sealing space side.

  FIG. 3 is a diagram for explaining the arrangement of sub-pixels in the organic EL display device according to the present embodiment.

  As described above, the organic EL display device includes a plurality of rows of light emitting layers 18 in which the emission colors are the first color, the second color, and the third color and form a stripe arrangement. The light emitting layer 18 in each column includes a plurality of subpixels SP that emit light by energy generated by an electric field or current. That is, each subpixel SP is a portion of the light emitting layer 18 where an electric field is applied between one pixel electrode 14 and the counter electrode 28 (a portion facing a portion exposed from the bank 16 of one pixel electrode 14). is there.

  As shown in FIG. 3, subpixels SP of the same color are arranged in the vertical direction (longitudinal direction of each light emitting layer 18). The subpixels SP of three colors (R (red), G (green), and B (blue)) are arranged in the horizontal direction (arrangement direction of the plurality of light emitting layers 18).

The first first subpixel SP ₁ , the second second subpixel SP _2, and the third third subpixel SP ₃ arranged in the horizontal direction constitute one pixel PX. Further, the first pixel PX ₁ , the second pixel PX ₂ and the third pixel PX ₃ arranged in the horizontal direction form a pixel group PXG. Pixel groups PXG are repeatedly arranged in the horizontal direction.

In the pixel group PXG, the arrangement order of the three-color subpixels SP in each pixel PX is different. Specifically, the first color positioned in the first sub-pixel SP ₁ in the first pixel PX ₁ (R) is a second pixel PX ₂ located in the second sub-pixel SP _2, 3 in the third pixel PX ₃ It is located in the sub-pixel SP _3. The second color (G) located in the second sub-pixel SP ₂ in the first pixel PX ₁ is located in the third sub-pixel SP ₃ in the second pixel PX ₂ and the first sub-pixel SP in the third pixel PX ₃ . Located at ₁ . The third color (B) located in the third sub-pixel SP ₃ in the first pixel PX ₁ is located in the first sub-pixel SP ₁ in the second pixel PX ₂ and the _second sub-pixel SP in the third pixel PX ₃ . Located at ₂ .

According to the present embodiment, the first color positioned in the first sub-pixel SP ₁ in the first pixel PX ₁ is located in the third sub-pixel SP ₃ in the third pixel PX _3. That is, the colors of the subpixels SP at both ends of the pixel group PXG are the same. Therefore, since the colors of the adjacent subpixels SP of a pair of adjacent pixel groups PXG are the same, two rows of the light emitting layers 18 can be formed by one opening of the mask, and the width of the opening Therefore, the width of the portion between the openings can be increased. In other words, even a high-definition mask with a narrow opening can secure a width necessary for strength. Therefore, the light emitting layer 18 can be formed by the mask vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask.

  Further, according to the present embodiment, since the high-definition subpixel SP can be formed, the interval between the adjacent subpixels SP can be widened, and the auxiliary wiring 30 is disposed in that region. Can do.

  FIG. 4 is a diagram illustrating a method for manufacturing the organic EL display device according to the present embodiment. In this manufacturing method, the substrate 10 (see FIG. 2) on which the pixel electrode 14, the reflective layer 12, and the hole transport layer 20 are formed is prepared. Then, as shown in FIG. 4, a plurality of rows of second hole transport layers 22 and light emitting layers 18 shown in FIG. 1 are formed by vapor deposition using a mask 36. The light emitting layer 18 in each column includes a plurality of subpixels SP (see FIG. 3) that emit light by energy generated by an electric field or current. The details are as described above.

  FIG. 5 is an enlarged view for explaining the opening of the mask. In FIG. 4, the opening is exaggerated for easy understanding, which is different from the actual shape.

  As shown in FIG. 5, the mask 36 has a row of openings 38 for forming a row of light emitting layers 18. The width A of the one-row openings 38 is the width of the light-emitting layers 18 in one row. Since the subpixel SP is a part of the light emitting layer 18, the width of the subpixel SP is smaller than A.

The mask 36 has two rows of openings 40 for forming a film having a width corresponding to the two rows of light emitting layers 18 in the horizontal direction. The two-row openings 40 have a width B of the distance between the edges of the two adjacent light-emitting layers 18 on the far side. If a plurality of light emitting layers 18 are formed so as not to overlap each other,
B = 2A
However, as shown in FIG. 2, if the light emitting layers 18 in a plurality of rows are formed so that the end portions of adjacent ones overlap, the overlapping width is subtracted,
B <2A
It is. By the vapor deposition material that passes through the two rows of openings 40, two adjacent rows of light emitting layers 18 are simultaneously and integrally formed with the same emission color.

  The first row openings 38 and the second row openings 40 are alternately arranged. The vapor deposition material passes through the one-row openings 38 and the two-row openings 40, and one row of light-emitting layers 18 and two rows of light-emitting layers 18 (apparently one row of light-emitting layers 19) having the same emission color are alternately arranged. Can be formed.

The mask 36 has a three-row shielding portion 41 that shields a region for forming the three rows of light emitting layers 18 between the two-row openings 40 and the one-row openings 38. The three-row shielding portion 41 has a width C equal to at least the width of the entire three subpixels SP arranged in the horizontal direction. If a plurality of light emitting layers 18 are formed so as not to overlap each other,
C = 3A
However, as shown in FIG. 2, if the light emitting layers 18 in a plurality of rows are formed so that the end portions of adjacent ones overlap, the overlapping width is subtracted,
C <3A
It is.

  FIG. 6 is a view showing the light emitting layer 18 formed using the mask 36. The first color light-emitting layer 18 and the second color light-emitting layer are arranged so that the subpixels SP of the same color are arranged in the vertical direction and the subpixels SP of the three colors are arranged in the horizontal direction by three times of vapor deposition using the mask 36. 18. A third color light emitting layer 18 is formed.

  In the present embodiment, the first step of forming the first color (for example, R) light emitting layer 18 is performed. Thus, one row of light emitting layers 18 of the first color and two rows of light emitting layers 18 of the first color (apparently one row of light emitting layers 19) are formed. There is an interval of the width C of the three-row shielding part 41 between them.

  Next, a second step of forming the light emitting layer 18 of the second color (for example, G) is performed. In the second step, the mask 36 arranged in the first step is moved along the arrangement direction of the two-row openings 40 and the first-row openings 38 to perform vapor deposition. Specifically, the two-row openings 40 are arranged adjacent to the positions of the first-row openings 38 arranged in the first step. The term “adjacent” includes that the end portions overlap each other. Since the mask 36 is arranged in this manner, the light emitting layers 18 of the second color (for example, G) are adjacent to the light emitting layer 18 of the first color (for example, R), and the light emission layer 18 (appears to be one line of light emission) Layer 19) can be formed. Further, the light emitting layer 18 of the third color (for example, B) is formed adjacent to the light emitting layer 18 of the first color (for example, R) (apparently, the light emitting layer 19 of the first color). Can do. Two rows of light emitting layers 18 of the first color (for example, R) (apparently one row of light emitting layers 19) and two rows of light emitting layers 18 of the second color (for example, G) (apparently one row of light emitting layers 19) ) Are not adjacent to each other.

  Next, a third step of forming the light emitting layer 18 of the third color (for example, B) is performed. In the third step, the mask 36 arranged in the second step is further moved along the arrangement direction of the two-row openings 40 and the first-row openings 38 to perform vapor deposition. Specifically, the one-row openings 38 are arranged adjacent to each other between the position of the two-row openings 40 arranged in the first step and the position of the two-row openings 40 arranged in the second step.

  In the third step, the mask 36 is arranged in this manner, so that it is adjacent to both the light emitting layer 18 in the first color (for example, R) and the light emitting layer 18 in the second color (for example, G). , Two rows of light emitting layers 18 (apparently one row of light emitting layers 19) of the third color (for example, B) can be formed. Also, two rows of light emitting layers 18 (apparently one row of light emitting layers 19) of the first color (for example, R) and two rows of light emitting layers 18 (apparently one row of the light emitting layers 19) of the second color (for example, G). ), A row of light emitting layers 18 of a third color (e.g., B) can be formed. Two rows of light emitting layers 18 (apparently one row of light emitting layers 19) of the first color (for example R) or two rows of light emitting layers 18 (apparently one row of light emitting layers 19) of the second color (for example G); The two rows of light emitting layers 18 of the second color (for example, G) (apparently one row of light emitting layers 19) are never adjacent.

  According to the present embodiment, two rows of light emitting layers 18 (apparently one row of light emitting layers 19) can be formed by one two row openings 40 of the mask 36, and the width of the two rows openings 40. Therefore, the width of the portion between the two-row openings 40 and the one-row openings 38 can be increased. In other words, even a high-definition mask 36 having narrow two-row openings 40 and one-row openings 38 can secure a necessary width in terms of strength. Therefore, the light emitting layer 18 can be formed by the mask vapor deposition method without increasing the number of vapor depositions and without reducing the strength of the mask 36.

  Thereafter, the structure shown in FIG. 2 is obtained through a process known as a method for manufacturing an organic EL display device. The manufacturing method according to the present embodiment includes a process that is obvious from the structure of the organic EL display device described above. The organic EL display manufactured in this way has an array of subpixels SP shown in FIG.

[Modification]
FIG. 7 is a diagram for explaining a first modification of the organic EL display device according to the first embodiment. In FIG. 7, adjacent subpixels SP of a pair of adjacent pixels PX in the horizontal direction have the same color. The three colors are green (G), red (R), and blue (B). The interval between subpixels SP adjacent to each other in green (G) and red (R) is wider than the interval between subpixels SP adjacent to each other in blue (B).

  FIG. 8 is a diagram for explaining a second modification of the organic EL display device according to the first embodiment. In FIG. 8, adjacent subpixels SP of a pair of adjacent pixels PX in the horizontal direction have the same color. One of the three colors is green (G). The interval between the subpixels SP adjacent to each other in green (G) is wider than the interval between the subpixels SP adjacent to each other in other colors.

  Since the resolution of human eyes decreases in the order of green, red, and blue, resolution can be improved by increasing the interval between the subpixels SP adjacent to each other at least in green. As shown in FIG. 7, the resolution can be further improved by increasing the interval between the subpixels SP adjacent to each other in red.

[Second Embodiment]
FIG. 9 is a diagram for explaining the arrangement of the light emitting layers of the organic EL display device according to the second embodiment of the present invention. Except for the arrangement of the light emitting layer 118, the contents described in the first embodiment are applicable. In particular, FIG. 2 is a cross-sectional view of the organic EL display device according to the present embodiment.

  The organic EL display device has a plurality of rows arranged in a plurality of rows and a plurality of columns of three colors (R (red), G (green), and B (blue)) of the first color, the second color, and the third color. The light emitting layer 118 is included.

  The light emitting layer 118 arranged in the nth row and the light emitting layer 118 arranged in the (n + 1) th row are arranged so as to be shifted by a half of the width of one light emitting layer 118 in the direction along the row. Note that the adjacent light emitting layers 118 overlap each other at the ends.

  In each row, the light emitting layers 118 of the same color are arranged so as not to be adjacent to each other. That is, the light emitting layers 118 of the second color and the third color are adjacent to the light emitting layer 118 of the first color. In the n-th and n + 1-th rows, the light emitting layers 118 of the same color are arranged so as not to be adjacent to each other. That is, the light emitting layers 118 of the second color and the third color are disposed obliquely above or obliquely below the first color light emitting layer 118. The arrangement order of the light emitting layers 118 in the nth row and the n + 2th row is the same. Similarly, the arrangement order of the light emitting layers 118 in the n + 1th row and the n + 3th row is also the same.

  FIG. 10 is a diagram for explaining the arrangement of sub-pixels in the organic EL display device according to the second embodiment of the present invention.

  Each light emitting layer 118 includes three subpixels SP that emit light by energy generated by an electric field or current. Each subpixel SP is a portion of the light emitting layer 118 that emits light when an electric field is applied, for example, a region partitioned by banks. Three subpixels SP of the first color, the second color, and the third color (R (red), G (green), and B (blue)) constitute one pixel PX in the delta arrangement.

  The light emitting layers 118 in the n-th row and the (n + 1) -th row have a positive delta array of positive pixels RPX in which one subpixel SP is arranged at each vertex of a triangle, and one subpixel SP at each vertex of an inverted triangle. The inverted pixels IPX of the inverted delta arrangement that are arranged are alternately arranged. That is, the reverse pixel IPX is arranged next to the normal pixel RPX in the row direction. On the other hand, in the column direction, a normal pixel RPX is arranged next to the normal pixel RPX, and a reverse pixel IPX is arranged next to the reverse pixel IPX.

The first positive pixel RPX ₁ , the second positive pixel RPX ₂ and the third positive pixel RPX _{3 in the} positive delta arrangement, and the first reverse pixel IPX ₁ , the second reverse pixel IPX ₂ and the third reverse pixel IPX _{3 in the} reverse delta arrangement. These six pixels PX form a pixel group PXG. Pixel groups PXG are repeatedly arranged.

In one pixel group PXG, the arrangement order of the three-color subpixels SP in the positive pixel RPX is different. The first color located at the first positive vertex RV ₁ in the first positive pixel RPX ₁ is adjacent to the first positive direction R _{1 in} the left direction and the clockwise direction of the first positive vertex RV ₁ in the second positive pixel RPX ₂ . the second is located on the positive vertex RV _2, is located on the third positive vertex RV ₃ next to the third positive pixel RPX ₃ in the first direction _{D 1} around the second positive apex RV ₂ of. The second color located at the second positive vertex RV ₂ at the first positive pixel RPX ₁ is located at the third positive vertex RV ₃ at the second positive pixel RPX ₂ , and the first positive vertex RV at the third positive pixel RPX ₃ . Located at ₁ . The third color located at the third positive vertex RV ₃ in the first positive pixel RPX ₁ is located at the first positive vertex RV ₁ in the second positive pixel RPX ₂ and the _second positive vertex RV in the third positive pixel RPX ₃ . Located at ₂ .

In one pixel group PXG, the arrangement order of the three-color sub-pixels SP in the reverse pixel IPX is different. The first color located at the first inverse vertex IV ₁ in the first inverse pixel IPX ₁ is about the second direction D ₂ opposite to the first direction D ₁ of the first inverse vertex IV ₁ in the second inverse pixel IPX ₂ . to position the second opposite vertices IV ₂ next, are located on the third reverse vertex IV ₃ next to the third second direction _{D 2} around the reverse pixel IPX ₃ in a second opposite vertex IV _2. The second color located at the second inverse vertex IV ₂ in the first inverse pixel IPX ₁ is located at the third inverse vertex IV ₃ in the second inverse pixel IPX ₂ and the first inverse vertex IV in the third inverse pixel IPX ₃ . Located at ₁ . The third color located at the third inverse vertex IV ₃ in the first inverse pixel IPX ₁ is located at the first inverse vertex IV ₁ in the second inverse pixel IPX ₂ and the _second inverse vertex IV in the third inverse pixel IPX ₃ . Located at ₂ .

  In one pixel group PXG, adjacent sub-pixels SP of the adjacent normal pixel RPX and reverse pixel IPX have the same color. Three subpixels SP of the same color are arranged in the row direction.

  According to the present embodiment, since one light emitting layer 118 includes three subpixels SP, the width of the opening of the mask that forms the subpixel SP is increased, so that the width of the portion between the openings can be increased. it can. In other words, even a high-definition mask with a narrow opening can secure a width necessary for strength. Therefore, the light emitting layer 118 can be formed by a mask vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask.

  FIG. 11 is a diagram showing a mask 136 used in the method of manufacturing the organic EL display device according to this embodiment.

  In the manufacturing method of the organic EL display device according to the present embodiment, the plurality of light emitting layers 118 (see FIG. 9) of the three colors of the first color, the second color, and the third color are used as the mask 136. Forming by vapor deposition using

The mask 136 has a plurality of openings 140 arranged in a plurality of rows and a plurality of columns. The opening 140 has a width W ₁ for forming three subpixels SP (see FIG. 10) along the row (laterally). The mask 136 has a shielding part 141. The shielding part 141 is a part other than the opening part 140. The shielding part 141 shields the region (width W ₂ ) for forming the six subpixels SP between the adjacent opening parts 140 in the direction along the row. The openings 140 arranged in the n-th row are arranged at positions shifted from the center of the shielding portion 141 in the (n + 1) -th row to the n-th row. That is, in the nth row and the n + 1th row, the position of the opening 140 is shifted by ½ of the width W ₂ of the shielding portion 141.

  The first color light emitting layer 118 shown in FIG. 9 is formed using the mask 136 (first step). Subsequently, a second color light emitting layer 118 is formed (second step). A second step is performed after the first step. In the second step, the mask 136 disposed in the first step is deposited by moving along the row so that the opening 140 is positioned adjacent to the position of the opening 140 disposed in the first step. (See FIG. 9). Then, the third color light emitting layer 118 is formed (third step). A third step is performed after the second step. In the third step, the mask 136 arranged in the second step is adjacent to the position between the position of the opening 140 arranged in the first step and the position of the opening 140 arranged in the second step along the row. Then, the film is further moved so that the opening 140 is positioned (see FIG. 9).

  According to the present embodiment, the three color light emitting layers 118 can be formed in a plurality of rows and a plurality of columns. In each row, the light emitting layers 118 of three colors are repeatedly arranged in a certain order. Then, the light emitting layers 118 of other colors are located shifted to the (n + 1) th row from the center of the two color light emitting layers 118 arranged adjacent to each other in the nth row. That is, the three color light emitting layers 118 are arranged in a delta arrangement. Accordingly, the two-color subpixels SP adjacent in the row direction and the other one-color subpixel SP in the adjacent row form a delta array of pixels PX.

Since one opening 140 has a width _{W 1} for forming three sub-pixels SP, since the width _{W 1} of the opening 140 is increased, the width _{W 2} of the shielding portion 141 between the openings 140, It can be made wider than the conventional technique in which one subpixel is formed by one opening. The distance D ₃ between the openings 140 adjacent to the oblique direction becomes wider.

  According to the present embodiment, even a high-definition mask 136 having a narrow opening 140 can ensure a necessary width in terms of strength. Therefore, the light emitting layer 118 can be formed by the mask 136 vapor deposition method without increasing the number of times of vapor deposition and without reducing the strength of the mask 136.

[Modification]
FIG. 12 is a diagram for explaining a modification of the organic EL display device according to the second embodiment. The light emitting layer 218 shown in FIG. 12 is formed so that the upper surface has an oval shape. FIG. 13 is a view showing a mask 236 for forming the light emitting layer 218 according to the modification. The opening 240 of the mask 236 has an oval shape.

  FIG. 14 is a diagram showing subpixels formed from the light emitting layer shown in FIG. The sub-pixel SP ′ is formed so that its upper surface is circular due to the shape of a bank (not shown) (see bank 16 in FIG. 2). Regarding the arrangement of the sub-pixels SP ′, the contents described in the second embodiment are on the street.

  FIG. 15 is a diagram showing another subpixel formed from the light emitting layer shown in FIG. In FIG. 15, the plurality of subpixels SP ″ configured by one light emitting layer 218 has a shape in which the upper surface is divided into a plurality of oval shapes as a whole.

  The present invention is not limited to the embodiment described above, and various modifications are possible. For example, the configuration described in the embodiment can be replaced with a substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

SP subpixels, SP ₁ first sub-pixel, SP ₂ second sub-pixel, SP ₃ third sub-pixels, PX pixel, PX ₁ first pixel, PX ₂ second pixel, PX ₃ 3 pixels, PXG pixel group, RPX positive pixel, IPX reverse pixel, RPX ₁ first positive pixel, RPX ₂ second positive pixel, RPX ₃ third positive pixel, IPX ₁ first reverse pixel, IPX ₂ second reverse pixel, IPX ₃ third reverse pixel, RV ₁ first normal vertex, RV ₂ second normal vertex, RV ₃ third normal vertex, IV ₁ first reverse vertex, IV ₂ second reverse vertex, IV ₃ third reverse vertex, SP ′ subpixel, SP ″ sub Pixel, 10 substrate, 12 reflective layer, 14 pixel electrode, 16 bank, 18 light emitting layer, 19 light emitting layer, 20 hole transport layer, 22 second hole transport layer, 24 electron transport layer 26 Electron injection layer, 28 Counter electrode, 30 Auxiliary wiring, 32 Sealing member, 34 Sealing material, 36 Mask, 38 1 row opening, 40 2 row opening, 41 3 row shielding part, 118 Light emitting layer, 136 mask, 140 opening part, 141 shielding part, 218 light emitting layer, 240 opening part, 236 mask.

Claims (9)

Including a plurality of rows of light-emitting layers having a stripe arrangement of three colors of the first color, the second color, and the third color;
The light emitting layer of each column includes a plurality of subpixels that emit light by energy generated by an electric field,
The sub-pixels of the same color are arranged in the vertical direction,
The subpixels of the three colors are arranged in a horizontal direction,
The first first subpixel, the second second subpixel, and the third third subpixel arranged in the horizontal direction constitute one pixel,
The first pixel, the second pixel, and the third pixel arranged in the horizontal direction form a pixel group,
The pixel group is repeatedly arranged in the horizontal direction,
In the pixel group, the arrangement order of the sub-pixels of the three colors in each pixel is different,
The first color located at the first sub-pixel at the first pixel is located at the second sub-pixel at the second pixel, and located at the third sub-pixel at the third pixel;
The second color located in the second subpixel at the first pixel is located at the third subpixel at the second pixel, and located at the first subpixel at the third pixel;
The third color located at the third sub-pixel at the first pixel is located at the first sub-pixel at the second pixel and located at the second sub-pixel at the third pixel. Organic electroluminescence display device. The organic electroluminescence display device according to claim 1,
The adjacent subpixels of the pair of pixels adjacent in the horizontal direction are of the same color,
The three colors are green, red and blue,
The organic electroluminescence display device, wherein an interval between the sub-pixels adjacent to each other between the green and red is wider than an interval between the sub-pixels adjacent to each other between blue. The organic electroluminescence display device according to claim 1,
The adjacent subpixels of the pair of pixels adjacent in the horizontal direction are of the same color,
One of the three colors is green;
The organic electroluminescence display device, wherein an interval between the subpixels adjacent to each other in green is wider than an interval between the subpixels adjacent to each other in other colors. Including a step of forming a plurality of light emitting layers in a stripe arrangement with three emission colors by vapor deposition using a mask,
The light emitting layer of each column includes a plurality of subpixel portions that emit light by energy generated by an electric field,
The step includes a first step of forming the light emitting layer of the first color so that the sub-pixels of the same color are arranged in the vertical direction and the sub-pixels of the three colors are arranged in the horizontal direction; A second step of forming a light emitting layer, and a third step of forming the light emitting layer of a third color,
The mask alternately includes two row openings for forming a film having a width corresponding to two rows of the light emitting layers in the lateral direction and one row openings for forming one row of the light emitting layers. And there is a three-row shielding portion that shields a region for forming the light-emitting layers in three rows between the two-row openings and the first-row openings,
Performing the second step after the first step;
In the second step, the mask arranged in the first step is formed on the first row opening arranged in the first step along the arrangement direction of the second row opening and the first row opening. The vapor deposition is performed by moving so that the two-row openings are located adjacent to the position,
Performing the third step after the second step,
In the third step, the mask arranged in the second step is formed on the two-row openings arranged in the first step along the arrangement direction of the two-row openings and the first-row openings. The organic electroluminescence is characterized in that the vapor deposition is further performed by moving the first row openings so that the first row openings are located adjacent to each other between the position and the position of the second row openings arranged in the second step. Manufacturing method of display device. A plurality of light-emitting layers arranged in a plurality of rows and a plurality of columns, each of the three colors of the first color, the second color, and the third color.
Each of the light emitting layers includes three sub-pixels that emit light by energy generated by an electric field,
The three sub-pixels of the first color, the second color, and the third color constitute one pixel in a delta arrangement,
The light emitting layer arranged in the nth row and the light emitting layer arranged in the (n + 1) th row are arranged with a deviation of ½ of the width of one light emitting layer in the direction along the row,
In the light emitting layers in the n-th row and the n + 1-th row, a positive pixel in a normal delta arrangement in which one sub-pixel is arranged at each vertex of a triangle, and one sub-pixel in each vertex of an inverted triangle. The inverted delta arrangement of inverted pixels arranged alternately is arranged,
The six pixels comprising the first positive pixel, the second positive pixel, and the third positive pixel in the positive delta arrangement, and the first reverse pixel, the second reverse pixel, and the third reverse pixel in the reverse delta arrangement are pixels. Constituting a group, the pixel groups are repeatedly arranged,
In the pixel group, the arrangement order of the sub-pixels of the three colors in the positive pixel is different,
The first color located at the first positive vertex of the first positive pixel is adjacent to the second positive vertex adjacent to the second positive pixel around the first direction of the left and right turns of the first positive vertex. Located at a third positive vertex adjacent to the third positive pixel around the first direction of the second positive vertex;
The second color located at the second positive vertex at the first positive pixel is located at the third positive vertex at the second positive pixel, and at the first positive vertex at the third positive pixel;
The third color located at the third positive vertex at the first positive pixel is located at the first positive vertex at the second positive pixel, and at the second positive vertex at the third positive pixel;
In the pixel group, the arrangement order of the sub-pixels of the three colors in the reverse pixel is different,
The first color located at the first reverse vertex of the first reverse pixel is a second reverse vertex adjacent to the second reverse pixel around a second direction opposite to the first direction of the first reverse vertex. Located at the third inverse vertex adjacent to the second inverse vertex about the second direction of the second inverse vertex;
The second color located at the second inverse vertex in the first inverse pixel, located at the third inverse vertex at the second inverse pixel, and located at the first inverse vertex at the third inverse pixel;
The third color located at the third reverse vertex at the first reverse pixel is located at the first reverse vertex at the second reverse pixel and at the second reverse vertex at the third reverse pixel. An organic electroluminescence display device. The organic electroluminescence display device according to claim 5,
Each of the light emitting layers is formed so that an upper surface has an oval shape. An organic electroluminescence display device, wherein: The organic electroluminescence display device according to claim 5,
Each of the sub-pixels is formed so as to have a circular upper surface. An organic electroluminescence display device, wherein: The organic electroluminescence display device according to claim 5,
The organic electroluminescence display device, wherein the plurality of sub-pixels configured by one light-emitting layer has a shape in which an upper surface is divided into a plurality of oval shapes as a whole. Including a step of forming a plurality of light emitting layers of each of three colors of the first color, the second color, and the third color by vapor deposition using a mask,
Each of the light emitting layers includes a plurality of subpixels that emit light by energy generated by an electric field,
The step includes a first step of forming the light emitting layer of the first color, a second step of forming the light emitting layer of the second color, and a third step of forming the light emitting layer of the third color. Including
The mask has a plurality of openings arranged in a plurality of rows and columns, each opening having a width for forming the three subpixels along the rows, and in a direction along the rows. Between the openings adjacent to each other, there is a shielding portion that shields an area for forming the six sub-pixels, and the opening arranged in the nth row extends from the center of the shielding portion in the (n + 1) th row. It is arranged at a position shifted from the nth row,
Performing the second step after the first step;
In the second step, the opening disposed in the mask disposed in the first step is positioned adjacent to the position of the opening disposed in the first step along the row. Move to perform the deposition,
Performing the third step after the second step,
In the third step, the mask arranged in the second step is arranged along the row with the position of the opening arranged in the first step and the opening arranged in the second step. The method of manufacturing an organic electroluminescence display device, wherein the vapor deposition is performed by further moving so that the opening is located adjacent to each other between positions.

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