JP2011148233A - Printer, method for forming light emitting layer, method for forming organic light emitting device, and organic light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer suitable to form a light emitting layer in a light emitting element layer of an organic light emitting device. <P>SOLUTION: The printer 10 includes a frame 5; a flat plate-like ink plate 20 which is disposed on the frame 5 and has a gravure plate section 14 and an onyx plate section 1; and a transfer roll 24 which abuts on the ink plate 20 to receive ink 30. The transfer roll 24 has a center roll 25, and a bracket portion 27 and a flexo portion 23 provided on the circumferential surface of the center roll 25. The bracket portion 27 is configured to receive ink 30 from the gravure plate section 14 of the ink plate 20 and to transfer the ink 30 onto a substrate 52, and the bracket portion 27 is formed of an elastic material. The flexo portion 23 is configured to receive ink 30 from the onyx plate section 1 of the ink plate 20 and to transfer the ink 30 onto the substrate 52, and the flexo portion 23 is also formed of an elastic material. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a printing machine that performs printing using a transfer roll having a blanket part and a flexo part. Moreover, this invention relates to the method of forming the light emitting layer in the light emitting element layer of an organic light emitting device using the said printing machine. The present invention also relates to a method for forming an organic light emitting device including a step of forming a light emitting layer by the printing machine, and an organic light emitting device.

  An organic light emitting device is a device that emits light when excited by applying an electric field to an organic light emitting material. Organic light-emitting devices have features such as high visibility due to self-luminous properties and excellent impact resistance due to being completely solid elements. In addition, the organic light emitting device has high luminous efficiency such as high luminance emission even at a low applied voltage of less than 10 V, can emit light with a simple element structure, has high luminance and is long. It has advantages such as a lifetime.

  The organic light-emitting device has a stacked structure in which a light-emitting element layer having at least a light-emitting layer is formed between electrodes facing each other. Here, when the organic light-emitting device emits light, each layer of the light-emitting element layer can have a thickness in nanometer units. For this reason, the organic light emitting device has an advantage that it is easy to make the device thinner and lighter than other light emitting devices. Furthermore, each layer of the organic light-emitting device can be produced by applying a coating solution in which a polymer material is dissolved. For this reason, the organic light-emitting device can be manufactured by applying a printing method to paper or an inkjet method. There is also an advantage that an applied manufacturing method can be applied.

  The use of organic light-emitting devices having these many advantages as advertising displays and the like has been studied. For example, Patent Document 1 proposes that a fixed pattern made up of specific characters or figures is displayed by light emission using an organic light emitting device. In Patent Document 1, it is also proposed to light-display a variable pattern made up of characters or figures that move or change over time. Such variable-pattern light-emitting display is realized by arranging light-emitting element layers vertically and horizontally in the form of dots and causing each dot to emit light independently of each other according to time.

JP 2004-111158 A

  In general, it is possible to attract the attention of an unspecified person by increasing the fixed pattern of the advertising display. Also, by providing a variable pattern, the attention of the attracted person can be kept long. Accordingly, in order to improve the appeal effect of the advertising display, it is preferable that one organic light emitting device includes both a fixed pattern area for displaying and displaying a fixed pattern and a variable pattern area for displaying a variable pattern. .

  The present invention has been made in consideration of such points, and an object thereof is to provide an organic light-emitting device that can be applied as an advertising display having an excellent appealing effect. It is another object of the present invention to provide a method for forming the organic light emitting device or a method for forming a light emitting layer of a light emitting element layer in the organic light emitting device. A further object of the present invention is to provide a printing machine suitable for forming a light emitting layer of the light emitting element layer.

  The present invention provides a frame, a plate-shaped ink plate which is disposed on the frame and has a gravure plate portion and an anix plate portion on the upper surface thereof, and supplies ink to the gravure plate portion and the anix plate portion of the ink plate. An ink supply unit, a transfer roll that contacts the gravure plate portion and an anix plate portion of the ink plate and receives the ink, and a substrate is sandwiched between the transfer roll and the ink on the transfer roll The transfer roll is provided on the center roll and the center roll, and receives the ink from the gravure plate portion of the ink plate and transfers the ink onto the substrate. A blanket portion made of an elastic material to be formed on the center roll, and receives ink from the anix plate portion of the ink plate and A flexo portion made of an elastic material that transfers the ink, and the blanket portion includes an ink receiving surface that receives ink from a gravure plate portion of the ink plate, and the flexo portion is an anix plate portion of the ink plate A convex portion that receives ink from the ink and a concave portion that does not receive ink from the anix plate portion, and the convex portion of the flexo portion is retracted inside the transfer roll from the ink receiving surface of the blanket portion. This is a printing machine.

  The present invention is a roll-shaped ink plate, an ink plate having a gravure plate portion and an anix plate portion on the outer peripheral surface thereof, and an ink supply portion for supplying ink to the gravure plate portion and the anix plate portion of the ink plate And a transfer roll that abuts on the gravure plate portion and an anix plate portion of the ink plate and receives the ink, and a substrate is sandwiched between the transfer roll, and the ink on the transfer roll is placed on the substrate. An elastic material for transferring the ink onto the base material and receiving the ink from the gravure plate portion of the ink plate. And an elastic material that is provided on the center roll and receives the ink from the anix plate portion of the ink plate and transfers the ink onto the substrate. The blanket portion includes a first ink receiving surface that receives ink from the gravure plate portion of the ink plate, and the flexographic plate portion receives ink from the anix plate portion of the ink plate. A convex portion that receives the ink and a concave portion that does not receive ink from the anix plate portion, and the convex portion of the flexographic plate portion is retracted inside the transfer roll from the ink receiving surface of the blanket portion. Is a printing press.

  In the printing press of the present invention, preferably, the convex portion of the flexographic plate portion is retracted inward of the transfer roll by 0.1 to 0.5 mm from the ink receiving surface of the blanket portion.

  In the printing machine of the present invention, preferably, the viscosity (ink temperature 23 ° C.) of the ink at a shear rate of 100 / sec is in the range of 51 to 200 cP.

  In the printing press according to the present invention, preferably, the ink includes a solvent and a solid content dissolved in the solvent, and the solvent has a surface tension of 37 dyne / cm or less and a boiling point of 165 to 250 ° C. Is within the range.

  In the printing machine of the present invention, the solid content in the ink is preferably in the range of 1.5 to 3.5% by weight.

  In the printing machine of the present invention, preferably, the blanket portion of the transfer roll is made of a resin film having a surface tension of 35 dyne / cm or more.

  In the printing machine of the present invention, preferably, the thickness of the resin film is in the range of 5 to 200 μm.

  In the printing machine of the present invention, the blanket portion of the transfer roll may be provided integrally with the resin film on the peripheral surface of the center roll of the transfer roll.

  In the printing machine of the present invention, the blanket part of the transfer roll is made of a resin film having a surface tension of 35 dyne / cm or more, and a position for receiving ink from the gravure plate part, and the ink is transferred onto the substrate. In the range including at least the position, the resin film may be conveyed while being wound around a rotating central roll.

  In the printing press of the present invention, a cushion layer may be interposed between the center roll and the blanket part.

  In the printing press of the present invention, the flexographic portion of the transfer roll may be made of a resin material that can be developed with water.

  In the printing press of the present invention, the flexographic portion of the transfer roll may be made of a resin material that can be laser engraved.

  In the printing machine of the present invention, the flexographic portion of the transfer roll may be fixed to the peripheral surface of the center roll of the transfer roll with an adhesive material.

  In the printing press according to the present invention, the plate cylinder may include a metal roll, a cylindrical plastic sleeve surrounding the metal roll, and a flexographic plate provided on the outer periphery of the plastic sleeve. In this case, the plastic sleeve may be fixed on the metal roll by an air clamp mechanism arranged in the metal roll. Or the said plastic sleeve may be fixed on the metal roll by the adsorption | suction mechanism arrange | positioned in the said metal roll.

  The present invention provides a method for forming the light-emitting layer of an organic light-emitting device comprising the opposing electrodes and the light-emitting element layer provided between the electrodes and having at least a light-emitting layer, using the printing press described above. Filling the gravure plate portion and an anix plate portion of the ink plate with ink containing a luminescent material, accepting the ink from the gravure plate portion and the anix plate portion to the transfer roll, and on the transfer roll A step of transferring the ink onto a substrate, and the transfer roll is provided on a center roll and a center roll, and receives the ink from the gravure plate portion of the ink plate and on the substrate. A blanket part made of an elastic material that transfers ink and a central roll are provided on the center roll to receive ink from the anix plate part. And a flexo part made of an elastic material that transfers the ink onto the substrate, and the blanket part includes an ink receiving surface that receives ink from a gravure plate part of the ink plate, and the flexo part Includes a convex portion that receives ink from the anix plate portion of the ink plate and a concave portion that does not receive ink from the anix plate portion, and the convex portion of the flexographic portion is located on the inner side of the ink receiving surface of the blanket portion. In this method, the light emitting layer is recessed.

  The present invention relates to a method for forming an organic light emitting device comprising opposing electrodes and a light emitting element layer disposed between the electrodes and having at least a light emitting layer, a step of preparing a base material, Forming a first electrode layer having a desired pattern; and forming an insulating layer having a plurality of openings exposing a desired portion of the first electrode layer on the base material; Forming a light emitting element layer having at least a light emitting layer in the opening, and forming a second electrode layer so as to be connected to the light emitting element layer located in a desired opening of the light emitting element layer; The light emitting layer of the light emitting element layer is formed by the method described above, and is a method for forming an organic light emitting device.

  In the method for forming an organic light-emitting device of the present invention, a light-emitting element layer is formed in the region where the light-emitting element layer is formed in the opening and between the first electrode layer and the second electrode layer. The light emitting region may be defined by the region that is formed. In this case, the light emitting region includes at least one first light emitting region and a plurality of second light emitting regions, and the area of the first light emitting region is larger than the area of the second light emitting region. . The light emitting layer of the light emitting element layer in the first light emitting region is formed from ink transferred from the blanket portion, and the light emitting layer of the light emitting element layer in the second light emitting region is ink transferred from the flexo portion. Formed from.

In the method for forming an organic light emitting device of the present invention, preferably, the area of the first light emitting region is 1 mm ² or more, and the area of the second light emitting region is smaller than 1 mm ² .

  In the method for forming an organic light emitting device of the present invention, the light emitting region including the first light emitting region and the second light emitting region may be defined by the opening of the insulating layer. In this case, in the step of forming the light emitting element layer, the light emitting element layer is formed so as to cover the insulating layer and the opening.

The present invention includes a substrate, a first electrode layer formed in a desired pattern on the substrate, and a plurality of portions formed on the substrate and exposing a desired portion of the first electrode layer upward. An insulating layer having an opening, a light emitting element layer having at least a light emitting layer formed in each opening so as to cover the first electrode layer in each opening, and located in a desired opening of the light emitting element layer A second electrode layer formed so as to be connected to the light emitting element layer, wherein the light emitting element layer is formed in the opening, and the first electrode layer and the second electrode layer A light emitting region is defined by a region in which a light emitting element layer is formed, and the light emitting region includes at least one first light emitting region and a plurality of second light emitting regions, and the first light emitting region The area of the second light emitting region is 1 mm ² or more. The area of the region is an organic light-emitting device characterized by being smaller than 1 mm ² .

In the organic light-emitting device of the present invention, the light-emitting region including the first light-emitting region and the second light-emitting region may be defined by the opening of the insulating layer. In this case, the opening includes a first opening corresponding to the first light emitting region and a second opening corresponding to the second light emitting region, and the area of the first opening is 1 mm ² or more. The area of the second opening is smaller than 1 mm ² .

According to the present invention, the transfer roll of the printing press includes a central roll and a blanket made of an elastic material that is provided on the central roll and receives the ink from the gravure plate portion of the ink plate and transfers the ink onto the substrate. And a flexo portion made of an elastic material that is provided on the center roll and receives ink from the anix plate portion of the ink plate and transfers the ink onto the substrate. In addition, the blanket part includes an ink receiving surface that receives ink from the gravure plate part of the ink plate, and the flexo part does not receive ink from the anix plate part of the ink plate and the ink from the anix plate part. And a recess. For this reason, gravure offset printing by combining the gravure plate part of the ink plate and the blanket part of the transfer roll and flexographic printing by combining the anilox plate part of the ink plate and the flexo part of the transfer roll are performed with one transfer roll. Can be done simultaneously.
Further, the convex portion of the flexo portion is recessed inside the transfer roll from the ink receiving surface of the blanket portion. For this reason, the printing pressure in the gravure offset printing by the blanket part can be made larger than the printing pressure in the flexo printing by the flexo part. Therefore, gravure offset printing and flexographic printing can be performed simultaneously with appropriate printing pressures. Thereby, the variation in the thickness of the layer formed by gravure offset printing and the variation in the thickness of the layer formed by flexographic printing can be appropriately suppressed.

  Moreover, according to this invention, the method of forming a light emitting layer includes the process of forming a light emitting layer with the printer described above. For this reason, gravure offset printing by combining the gravure plate part of the ink plate and the blanket part of the transfer roll and flexographic printing by combining the anilox plate part of the ink plate and the flexo part of the transfer roll are performed with one transfer roll. Can be done simultaneously. In addition, the convex part of the flexo part is retracted inward of the transfer roll from the ink receiving surface of the blanket part, so that the printing pressure in gravure offset printing by the blanket part is higher than the printing pressure in flexo printing by the flexo part. Can be bigger. Therefore, a light emitting layer with a uniform thickness can be formed with a large printing pressure by gravure offset printing, and a light emitting layer with a uniform thickness can be accurately formed with a printing pressure smaller than that of gravure offset printing by flexographic printing. can do.

  According to the invention, a method of forming an organic light emitting device including a light emitting element layer having at least a light emitting layer includes a step of forming a light emitting layer by the above described light emitting layer forming method. For this reason, a light emitting layer with a uniform thickness can be formed with a large printing pressure by gravure offset printing, and at the same time, a light emitting layer with a uniform thickness can be accurately formed with a printing pressure smaller than that of gravure offset printing by flexographic printing. Can be formed. As a result, a highly reliable organic light emitting device capable of high quality display can be formed.

According to the invention, the organic light emitting device includes a base material, a first electrode layer formed in a desired pattern on the base material, and a desired portion of the first electrode layer formed on the base material. An insulating layer having a plurality of openings exposed upward, a light emitting element layer having at least a light emitting layer formed in each opening so as to cover the first electrode layer in each opening, and a desired one of the light emitting element layers And a second electrode layer formed so as to be connected to the light emitting element layer located in the opening. In this case, the light emitting region is defined by the region where the light emitting element layer is formed in the opening and the region where the light emitting element layer is formed between the first electrode layer and the second electrode layer. The light emitting area is composed of at least one first light emitting area and a plurality of second light emitting areas. Among these, the area of the first light emitting region is 1 mm ² or more, and the area of the second light emitting region is smaller than 1 mm ² . By providing two types of light emitting regions having different areas in this manner, the attractiveness of the organic light emitting device can be improved.

FIG. 1 is a perspective view showing a printing machine according to an embodiment of the present invention. FIG. 2 is a plan view showing an ink plate according to the embodiment of the present invention. FIGS. 3A, 3B and 3C show the ratio of the width b in the printing direction of the cell of the gravure plate portion or the cell of the anilox plate portion to the width a in the direction perpendicular to the cell in the embodiment of the present invention. The top view which shows b / a. FIG. 4 is a cross-sectional view taken along line IV-IV of the transfer roll of the printing machine shown in FIG. 5A is a diagram showing a case where the transfer roll of FIG. 4 is seen from the Va direction, and FIG. 5B is a diagram showing a case where the transfer roll of FIG. 4 is seen from the Vb direction. FIG. 6 is a plan view showing an organic light-emitting device according to an embodiment of the present invention. 7 (a) and 7 (b) are diagrams showing how the organic light emitting device emits light in the embodiment of the present invention. 8 is a partial cross-sectional perspective view of the organic light emitting device of FIG. 6 taken along line VIII-VIII. FIGS. 9A to 9F are views showing a method for forming an organic light emitting device in an embodiment of the present invention. FIGS. 10A to 10C are views showing a modification of the method for forming the organic light emitting device. FIG. 11 is a diagram showing another embodiment of the printing machine according to the present invention. FIG. 12 is a view showing another embodiment of the printing machine according to the present invention. FIG. 13 is a diagram showing another embodiment of the printing machine according to the present invention. FIG. 14 is a diagram showing another embodiment of the printing machine according to the present invention. FIG. 15 is a view showing another embodiment of the ink plate according to the present invention. FIG. 16 is a diagram showing another embodiment of the ink plate according to the present invention. FIG. 17 is a view showing another embodiment of the ink plate in the present invention. FIG. 18 is a view showing another embodiment of the transfer roll according to the present invention. FIG. 19 is a plan view showing another embodiment of the organic light-emitting device according to the present invention. 20 is a diagram showing a relationship between the light emitting layer and the opening of the insulating layer in the organic light emitting device shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. First, the entire printing press 10 will be described with reference to FIG.

〔Printer〕
As shown in FIG. 1, the printing machine 10 includes a frame 5, a plate-shaped ink plate 20 that is disposed on the frame 5 and has a gravure plate portion 14 and an anix plate portion 1 on its upper surface, The ink supply unit 7 that supplies the ink 30 to the gravure plate unit 14 and the anix plate unit 1, and the ink 30 supplied from the ink supply unit 7 in the cell 15 (described later) of the gravure plate unit 14 and the cell of the anix plate unit 1 2 (described later), a doctor system 8 to be filled, a transfer roll 24 that contacts the ink plate 20 and receives the ink 30, and a substrate 52 is sandwiched between the transfer roll 24, And a backup body that transfers the ink 30 onto the base material 52. Here, as shown in FIG. 1, the backup body includes a base plate 6 on which a flat base 52 is placed, which is disposed on the frame 5. The transfer roll 24 is provided on the frame 5 so as to be able to travel along the printing direction indicated by the arrow P on the frame 5. The doctor system 8 includes a first doctor 8a that scrapes the ink 30 on the ink plate 20 in the right direction in FIG. 1, and a second doctor 8b that scrapes the ink 30 in the left direction in FIG. Yes.

Among these, as shown in FIG. 1, the transfer roll 24 has a center roll 25 that rotates in the direction indicated by the arrow R, and a blanket part 27 and a flexo part 23 provided on the peripheral surface of the center roll 25. . Among these, the blanket part 27 receives the ink 30 from the gravure plate part 14 of the ink plate 20 and transfers the ink 30 onto the substrate 52. The blanket part 27 is made of an elastic material. The flexo portion 23 receives the ink 30 from the anix plate portion 1 of the ink plate 20 and transfers the ink 30 onto the substrate 52. The flexo portion 23 is also made of an elastic material.
As will be described later, when the light emitting layer 58 is formed on the transparent substrate 52 of the organic light emitting device 51 (described later) by such a printing machine 10, the ink 30 transferred from the blanket portion 27 onto the transparent substrate 52 is used. The light emitting layer 58 of the fixed pattern region 61 of the organic light emitting device 51 is formed. On the other hand, the light emitting layer 58 of the variable pattern region 62 of the organic light emitting device 51 is formed by the ink 30 transferred from the flexo part 23 onto the transparent substrate 52.

[Ink plate]
Next, the ink plate 20 will be described in detail with reference to FIGS. FIG. 2 is a plan view for explaining an embodiment of the ink plate 20 of the present invention. As described above, the ink plate 20 has the gravure plate portion 14 and the anix plate portion 1 on the upper surface thereof. Hereinafter, each of the gravure plate portion 14 and the anix plate portion 1 will be described in detail.

First , the gravure printing part 14 will be described. As shown in FIG. 2, the gravure plate unit 14 has a plurality of cells 15 filled with the ink 30 from the ink supply unit 7. Each cell 15 has a stripe shape, and a non-cell portion 16 exists between the cells 15. Then, the width (cell manager _{L 1)} of each cell 15 (portion hatched), the ratio _L 1 / _{S 1} of the width of the non-cell portion 16 (the non-cell manager _{S 1)} is 0.8 to 100, Preferably it is in the range of 1-60. The width of the cell 15 (cell part length L ₁ ) is in the range of ₁₀ to 500 μm, preferably 30 to 300 μm, and the width of the non-cell part 16 (non-cell part length S ₁ ) is 2 to 500 μm, preferably The depth of the cell 15 (plate depth) is in the range of 20 to 200 μm, preferably 30 to 100 μm. The cell 15 and the non-cell part 16 have an area ratio of 55 to 95%, preferably 60 to 90% of the entire cell 15 occupying the entire area of the film formation site (the entire area of the cell 15 and the non-cell part 16). It is configured to be within the range.

Further, as shown in FIG. 3A, the gravure plate portion 14 of the present invention has a width b and a printing direction in the printing direction (direction indicated by the arrow P in the drawing) in each cell 15 (the hatched portion). The ratio b / a of the width a in the orthogonal direction is 0.6 or more, and the upper limit is not particularly limited. In the present invention, the printing direction is synonymous with the rotation direction of the transfer roll 24.
2 and 3A show examples in which each cell 15 having a stripe shape extends in parallel with the printing direction P, but the present invention is not limited to this. For example, as shown in FIGS. 3B and 3C, the direction in which each cell 15 extends and the printing direction P need not be parallel. Also in this case, as shown in FIGS. 3B and 3C, the width b in the printing direction (direction indicated by the arrow P in the drawing) in each cell 15 (the hatched portion) is orthogonal to the printing direction. The ratio b / a of the width a is 0.6 or more.

Incidentally, if the ratio _L 1 / _{S 1} of the cell manager _{L 1} in the gravure plate portion 14 and the non-cell manager _{S 1} is less than 0.8, a thick film formation becomes difficult, and when it exceeds 100, the gravure plate portion 14 Cell formation becomes difficult, and variations in film thickness increase, which is not preferable. Further, if the width of the cell 15 (cell portion length L ₁ ) is less than 10 μm, it is difficult to form a thick film, and if it exceeds 500 μm, the variation in film thickness increases, which is not preferable. Further, if the width of the non-cell portion 16 (non-cell portion length S ₁ ) is less than 2 μm, it is difficult to form cells of the gravure plate portion 14, and if it exceeds 500 μm, the variation in film thickness is large, and thick film formation Is not preferable.

  Further, when the depth of the cell 15 (plate depth) is less than 20 μm, it becomes difficult to form a thick film, and even if the plate depth exceeds 200 μm, the thickness of the coating film to be formed does not increase. Further, if the ratio b / a is less than 0.6, it is difficult to form a thick film, and it is difficult to form a light emitting layer having a thickness of 70 nm or more in the formation of a light emitting layer described later.

Anilox Plate Part Next, the anilox plate part 1 will be described. As shown in FIG. 2, the anilox plate unit 1 has a plurality of cells 2 filled with ink 30 from the ink supply unit 7. Each cell 2 has a stripe shape, and a non-cell portion 3 exists between the cells 2. In these cells 2 and non-cell portions 3, the ratio of the area of the entire cell 2 to the total area of the film formation site (area of the entire cell 2 and non-cell portion 3) is 55 to 95%, preferably 70 to 95%. It is comprised so that it may become. By setting the ratio of the area of the entire cell 2 to the total area of the film formation site as described above, a sufficient amount of ink 30 can be passed to the flexo portion 23 of the transfer roll 24.
The width of the cell 2 (cell part length L ₂ ) is, for example, in the range of 10 to 500 μm, and preferably in the range of 30 to 300 μm. The width of the non-cell portion 3 (non-cell manager _{S 2)} is, for example, a range of 2 mm to 500 mm, preferably are within the range of 5 to 200 [mu] m.

  Further, as in the case of the cell 15 of the gravure plate portion 14, the ratio b / a of the width b in the printing direction (direction indicated by the arrow P in the drawing) in each cell 2 and the width a in the direction orthogonal to the printing direction is 0.6 or more (see FIG. 3A). There is no particular limitation on the upper limit of the ratio b / a. Further, as in the case of the cell 15 of the gravure plate portion 14, the direction in which each cell 2 extends and the printing direction P may not be parallel (see FIGS. 3B and 3C).

  The depth (plate depth) of each cell 2 is preferably in the range of 20 to 200 μm, more preferably in the range of 30 to 100 μm. Preferably, the depth of each cell 2 of the anilox plate portion 1 is the same as the depth of each cell 15 of the gravure plate portion 14. Thus, by making the depth of the cell 2 and the cell 15 the same, the ink plate 20 having the gravure plate portion 14 and the anilox plate portion 1 can be more easily produced.

(Transfer roll)
Next, the transfer roll will be described in detail with reference to FIGS. 4 and 5A and 5B. 4 is a cross-sectional view taken along line IV-IV of the transfer roll 24 of the printing machine 10 of FIG. 1, and FIG. 5A shows a case where the transfer roll 24 of FIG. 4 is viewed from the Va direction. FIG. 5B is a diagram showing a case where the transfer roll 24 of FIG. 4 is viewed from the Vb direction.
As described above, the transfer roll 24 includes the center roll 25 that rotates in the direction indicated by the arrow R, and the blanket part 27 and the flexo part 23 provided on the peripheral surface of the center roll 25. Hereinafter, each of the blanket part 27 and the flexo part 23 will be described in detail.

Blanket Part First, the blanket part 27 will be described. As described above, the blanket portion 27 is made of an elastic material. Particularly preferably, the blanket portion 27 is made of a resin film 27a having a surface tension of 35 dyne / cm or more. 4 and 5A, the resin film 27a constituting the blanket portion 27 is integrally provided on the peripheral surface of the center roll 25 of the transfer roll 24. As shown in FIG. As shown in FIGS. 4 and 5A, the outer surface 27 b of the blanket portion 27 is flat across the entire blanket portion 27. The outer surface 27b is an ink receiving surface that receives the ink 30 from the gravure plate portion 14 of the ink plate 20, and the ink 30 has a pattern corresponding to the pattern of the cells 15 of the gravure plate portion 14 on the outer surface 27b. Accepted. The ink 30 received on the outer surface 27b is then transferred onto the substrate 52.
Thus, according to the present embodiment, so-called gravure offset printing is performed by the combination of the gravure plate portion 14 of the ink plate 20 and the blanket portion 27 of the transfer roll 24.

  If the surface tension of the resin film 27a constituting the blanket portion 27 is less than 35 dyne / cm, ink acceptability from the gravure plate portion 14 is lowered. For this reason, it becomes difficult to transfer the ink 30 to the base material 52 with a uniform thickness. The surface tension (solid surface tension [γs]) of the resin film 27a is calculated by using, for example, an automatic contact angle meter (DropMaster 700 type, manufactured by Kyowa Interface Science Co., Ltd.). In this case, first, using a liquid (standard substance) having two or more kinds of surface tensions, the contact angle θ is measured with an automatic contact angle meter, and then γs (solid surface tension) = γL (Surface tension of liquid) The surface tension of the resin film 27a is calculated based on the equation cos θ + γSL (surface tension of solid liquid).

  Examples of the resin film 27a used include a polyethylene terephthalate film, an easily adhesive type polyethylene terephthalate film, a polyethylene terephthalate film subjected to corona treatment, a polyphenylene sulfide film, a polyphenylene sulfide film subjected to corona treatment, a polyethylene naphthalate film, Examples thereof include resin films such as adhesive type polyethylene naphthalate film, polynorbornene film, and melamine baked polyethylene terephthalate film. The thickness of the resin film 27a can be, for example, in the range of 5 to 200 μm, preferably 10 to 100 μm. When the thickness of the resin film 27a is less than 5 μm, the film processability and the mounting property to the center roll 25 are not preferable. On the other hand, when the thickness of the resin film 27a exceeds 200 μm, the hardness becomes too high, and the flexibility is lowered, which is not preferable.

  A cushion layer (not shown) may be interposed between the center roll 25 and the resin film 27a of the blanket portion 27. In this case, the hardness of the cushion layer can be set in a range of 20 to 80, for example, and the thickness of the cushion layer can be set in a range of 0.1 to 30 mm, for example. In addition, said hardness is TypeA hardness by a JIS (K6253) durometer hardness test.

Flexo part Next, the flexo part 23 will be described. As described above, the flexo portion 23 is provided on the peripheral surface of the center roll 25 of the transfer roll 24. In this case, the flexo part 23 is fixed to the peripheral surface of the center roll 25 with an adhesive material. Further, as described above, the flexographic plate 23 is formed of an elastic material, and as shown in FIGS. 4 and 5B, each flexographic plate 23 extends along the rotation direction of the transfer roll 24. And a plurality of convex portions 23a arranged in a stripe shape, and a concave portion 23b formed between the convex portions 23a. As shown in FIGS. 4 and 5B, the upper surface 23 c of the convex portion 23 a is a surface that receives the ink 30 from the anix plate portion 1 of the ink plate 20. For this reason, when the ink 30 on the transfer roll 24 is transferred onto the substrate 52, the ink 30 from the flexo part 23 is transferred with a pattern corresponding to the pattern of the convex part 23 a of the flexo part 23.
Thus, according to the present embodiment, so-called flexographic printing is performed by a combination of the anix plate portion 1 of the ink plate 20 and the flexographic portion 23 of the transfer roll 24.

  The method for producing the flexo part 23 made of an elastic material is not particularly limited. For example, the flexo part 23 can be produced by exposing a water-developable resin material, performing water development, performing a film hardening process, and baking. . For example, polyvinyl alcohol can be used as the water-developable resin material.

  Alternatively, the flexo portion 23 may be manufactured by providing a resin material with an adhesive on the circumferential surface of the center roll 25 and engraving the resin material with laser light. As a resin material that can be engraved with laser light, for example, a photosensitive resin containing inorganic porous particles can be used. Examples of the photosensitive resin include an elastomer resin.

As described above, the transfer roll 24 has both the blanket part 27 and the flexo part 23. In this case, as described above, the gravure offset printing is performed by the blanket unit 27, and the flexographic printing is performed by the flexo unit 23.
In the gravure offset printing, the flat outer surface 27b of the blanket portion 27 presses the ink 30 against the substrate 52 over the entire surface. For this reason, gravure offset printing is generally suitable for applications in which a large-area layer is formed with a uniform thickness.
On the other hand, in flexographic printing, only the upper surface 23 c of the convex portion 23 a of the flexographic portion 23 presses the ink 30 against the substrate 52. For this reason, flexographic printing is generally suitable for applications in which a fine layer is formed with a uniform thickness.
According to the present embodiment, the transfer roll 24 has both the blanket part 27 and the flexo part 23, and for this reason, on the base material 52, a layer having a large area and a uniform thickness, and a fine and uniform Can be formed simultaneously.

  As described above, the flexo part 23 is used to form a fine layer. Here, in order to form a fine layer, it is preferable that the flexo portion 23 is made of an elastic material having a large rubber hardness. This is because if the rubber hardness of the elastic material constituting the flexo part 23 is too small, when the ink 30 of the convex part 23a of the flexo part 23 is transferred to the substrate 52, the convex part 23a is greatly elastically deformed. This is because the area of the layer formed on the material 52 can be larger than expected. For this reason, the flexo part 23 is preferably made of an elastic material having a rubber hardness higher than that of the resin film 27a of the blanket part 27.

  As described above, the rubber hardness of the flexo part 23 is higher than the rubber hardness of the blanket part 27. For example, the rubber hardness of the flexo part is 83 (Type A hardness according to JIS (K6253) durometer hardness test), and the rubber hardness of the blanket part 27 is in the range of 50-80. In this case, in order to form a layer having a uniform thickness by flexographic printing by the flexo part 23, the pushing amount at the time of flexographic printing by the flexo part 23 is made smaller than the pushing amount at the time of the gravure offset printing by the blanket part 27. Is preferred. This is because it is considered that the flexo part 23 cannot be sufficiently elastically deformed to correspond to the push-in amount when the push-in quantity during flexo printing by the flexo part 23 is equal to the push-in quantity during gravure offset printing by the blanket part 27. is there. If the flexo part 23 cannot be sufficiently elastically deformed to correspond to the pushing amount, the vibration generated in the ink plate 20 or the base material 52 is not sufficiently absorbed by the convex part 23a of the flexo part 23, and thus formed. It is considered that unevenness occurs in the thickness of the layer. For this reason, it is preferable to make the pushing amount at the time of flexographic printing by the flexo portion 23 smaller than the pushing amount at the time of gravure offset printing by the blanket portion 27.

As shown in FIG. 4, in the transfer roll 24, the upper surface 23 c of the convex portion 23 a of the flexo portion 23 is more inward of the transfer roll 24 (to the center roll 25) than the ink receiving surface formed by the outer surface 27 b of the blanket portion 27. Retracted by Δh. For this reason, the pushing amount at the time of flexographic printing by the flexo part 23 can be made smaller than the pushing amount at the time of the gravure offset printing by the blanket part 27.
Further, by providing a recess of Δh, when the ink 30 on the transfer roll 24 is transferred onto the base material 52, the force that the blanket part 27 presses the ink 30 against the base material 52 (printing pressure of gravure offset printing) The flexo portion 23 is larger than the force for pressing the ink 30 against the base material 52 (printing pressure for flexographic printing). That is, the ink 30 can be transferred onto the substrate 52 with a large printing pressure by the blanket portion 27, and at the same time, the ink 30 can be transferred onto the substrate 52 with a printing pressure smaller than that of the blanket portion 27 by the flexo portion 23. Can be made.

  The range of Δh is appropriately selected according to the area, thickness, allowable variation in thickness of each layer formed on the base material 52 by the ink 30 from the blanket part 27 or the flexo part 23, or the characteristics of the ink 30. However, preferably, Δh is in the range of 0.1 to 0.5 mm. By selecting Δh within such a range, a layer having a large area and a uniform thickness is formed by gravure offset printing by the blanket part 27, and at the same time, a layer having a fine and uniform thickness is formed by the flexo printing by the flexo part 23. Can be formed.

〔ink〕
Next, the ink 30 used in the printing machine 10 in the present embodiment will be described in detail. The ink 30 is composed of a solvent and a solid content dissolved in the solvent. As the ink 30, an ink 30 having a viscosity (ink temperature 23 ° C.) at a shear rate of 100 / sec within a range of 51 to 200 cP is used. As described above, the ink 30 used in the printing press 10 according to the present embodiment has a viscosity smaller than that of a general ink. Therefore, the ink 30 is formed of ink as compared with a case where a general ink is used. Variations in the height of the layers are likely to occur. In order to cope with this problem, in the present embodiment, as described above, the upper surface 23c of the convex portion 23a of the flexo portion 23 is more inward of the transfer roll 24 than the ink receiving surface formed by the outer surface 27b of the blanket portion 27. The transfer roll 24 is configured to retract by Δh. Thus, the printing pressure in the gravure offset printing by the blanket part 27 and the printing pressure in the flexo printing by the flexo part 23 are optimally set according to the viscosity of the ink 30.

  If the viscosity of the ink 30 at a shear rate of 100 / sec (ink temperature 23 ° C.) is less than 5 cP, ink sag occurs or formation of a layer with a desired thickness becomes difficult. On the other hand, if it exceeds 200 cP, unevenness due to the cells of the gravure plate portion 14 or the anilox plate portion 1 of the ink plate 20 becomes large, and it becomes difficult to form a layer having a uniform thickness. The above viscosity measurement is performed in a steady flow measurement mode at a measurement temperature of 23 ° C. using a viscoelasticity measuring device MCR301 type manufactured by Physica. In the ink 30, the ratio (V1 / V2) of the viscosity (ink temperature 23 ° C.) V1 at a shear rate of 100 / sec and the viscosity (ink temperature 23 ° C.) V2 at a shear rate of 1000 / sec is 0.9 to 1. It is preferable that it is about .5. By setting the ratio (V1 / V2) within the above range, the ink 30 exhibits a Newtonian flow.

Moreover, in the ink 30 used with the printing machine 10, it is preferable that the surface tension of the solvent currently used is 37 dyne / cm or less, and a boiling point exists in the range of 165-250 degreeC.
In addition, when the surface tension of the solvent used for the ink 30 exceeds 37 dyne / cm, the acceptability of the ink 30 from the ink plate 20 to the transfer roll 24 may be lowered, which is not preferable. Furthermore, when the boiling point of the solvent of the ink 30 is less than 165 ° C., the ink 30 transferred from the transfer roll 24 to the base material 52 is immediately dried, and thus a streak is likely to occur in the layer formed by the ink 30. It is possible to become. Further, when the boiling point of the solvent of the ink 30 exceeds 250 ° C., it is difficult to dry the ink 30, and the influence on the substrate 52 and the like due to drying in the drying zone may occur, and the solvent may remain. It is not preferable. In addition, the measurement of the surface tension of a solvent shall be performed by 20 degreeC of liquid temperature by the surface tension meter CBVP-Z type | mold made by Kyowa Interface Science Co., Ltd.

(Solid content of ink)
The solvent and solid content used for the ink 30 are appropriately selected according to the layer formed on the substrate 52 by the printing machine 10. For example, when the light emitting layer 58 of the light emitting element layer 56 of the organic light emitting device 51 is formed by the printing machine 10 as will be described later, as a solid content of the ink 30 for the light emitting layer 58, the following dye system, metal complex system And polymer type.
(1) Dye-based luminescent materials Cyclopentadiene derivatives, tetraphenylbutadiene derivatives, triphenylamine derivatives, oxadiazole derivatives, pyrazoloquinoline derivatives, distyrylbenzene derivatives, distyrylarylene derivatives, silole derivatives, thiophene ring compounds, pyridine rings Examples thereof include compounds, perinone derivatives, perylene derivatives, oligothiophene derivatives, trifumanylamine derivatives, oxadiazole dimers, and pyrazoline dimers.

(2) Metal complex light emitting material Aluminum quinolinol complex, benzoquinolinol beryllium complex, benzoxazole zinc complex, benzothiazole zinc complex, azomethylzinc complex, porphyrin zinc complex, europium complex, central metal such as Al, Zn, Be, or the like , Tb, Eu, Dy and the like, and a metal complex having oxadiazole, thiadiazole, phenylpyridine, phenylbenzimidazole, quinoline structure and the like as a ligand.

(3) Polymer-based light-emitting material Examples include polyparaphenylene vinylene derivatives, polythiophene derivatives, polyparaphenylene derivatives, polysilane derivatives, polyacetylene derivatives, polyvinylcarbazole derivatives, polyfluorene derivatives, and the like.
The content of the solid content in the light emitting layer ink 30 is preferably set in the range of 1.5 to 3.5% by weight.

(Ink solvent)
Moreover, when forming the light emitting layer 58 of the light emitting element layer 56 of the organic light emitting device 51 by the printing press 10, the surface tension satisfies the above range (37 dyne / cm or less) as the solvent of the ink 30, and the boiling point is Those satisfying the above range (165 to 250 ° C.), for example, cumene, anisole, n-propylbenzene, mesitylene, 1,2,4-trimethylbenzene, limonene, p-cymene, o-dichlorobenzene, butylbenzene, Use diethylbenzene, 2,3-dihydrobenzofuran, methyl benzoate, 1,2,3,4-tetramethylbenzene, amylbenzene, tetralin, ethyl benzoate, phenylhexane, cyclohexylbenzene, butyl benzoate, etc. alone Can do. Moreover, when using a mixed solvent, the surface tension and boiling point calculated by the ratio according to the mixing ratio satisfy | fill the said range. For example, in the case of a mixed solvent obtained by mixing a solvent 1 having a surface tension of Adyne / cm and a boiling point of B ° C. with a solvent 2 having a surface tension of Cdyne / cm and a boiling point of D ° C. of 3: 7, the mixing ratio The surface tension [(A × 3/10) + (C × 7/10)] calculated at a ratio corresponding to the above satisfies the above range (37 dyne / cm or less) and calculated at a ratio corresponding to the mixing ratio. The boiling point [(B × 3/10) + (D × 7/10)] must satisfy the above range (165 to 250 ° C.). Therefore, each solvent constituting the mixed solvent may have a surface tension and a boiling point outside the above ranges.

[Organic light emitting device]
Next, with reference to FIG. 6 thru | or FIG. 8, the organic light emitting device 51 containing the light emitting layer 58 formed with the printing machine 10 in this Embodiment is demonstrated. First, the structure of the organic light emitting device 51 as viewed from the normal direction of the organic light emitting device 51 will be described with reference to FIGS. 6 and 7A and 7B. FIG. 6 is a plan view showing the organic light emitting device 51 in the embodiment of the present invention, and FIGS. 7A and 7B show how the organic light emitting device 51 emits light in the embodiment of the present invention. FIG.

  As shown in FIGS. 6 and 7A and 7B, the organic light emitting device 51 has a fixed pattern region 61 in which a fixed pattern is emitted and displayed and a variable pattern region 62 in which a variable pattern is emitted and displayed. ing. Among these, the fixed pattern region 61 has three first light emitting elements that emit light to display the characters “A”, “B”, and “C”, as shown in FIGS. 6 and 7A and 7B. A region 63 is included. On the other hand, the variable pattern area 62 includes a large number of second light emitting areas 64 arranged vertically and horizontally in the form of dots. In FIGS. 6 and 7A and 7B, the first light emitting region 63 or the second light emitting region 64 that is blacked out is in the light emitting state. It is shown that. On the other hand, the first light emitting region 63 or the second light emitting region 64 that is white-colored indicates that the first light emitting region 63 or the second light emitting region 64 is in a non-light emitting state.

As can be seen from FIGS. 6 and 7A and 7B, the area of the first light-emitting region 63 is larger than the area of the second light-emitting region 64. For example, the area of the first light emitting region 63 is at least 1 mm ² or more, and the area of the second light emitting region 64 is smaller than 1 mm ² .
Thus, the appeal effect when the organic light emitting device 51 is used as an advertising display can be increased by setting the area of the first light emitting region 63 in the fixed pattern region 61 to 1 mm ² or more.
In addition, by making the area of the second light emitting region 64 in the variable pattern region 62 smaller than 1 mm ² , it is possible to accurately display arbitrary characters, figures, etc. in the variable pattern region 62. This can increase the appeal effect when the organic light emitting device 51 is used as an advertising display.
That is, by providing the two types of light emitting regions 63 and 64 having different areas, the appeal effect and attractiveness when the organic light emitting device is used as an advertising display can be improved.
As will be described later, the light emitting layers 58 in the first light emitting region 63 and the second light emitting region 64 are each formed from the printing press 10 according to the present embodiment. Therefore, in both the first light emitting region 63 and the second light emitting region 64, it is possible to realize a high quality display with high luminance and efficiency during light emission of the light emitting element layer 56. Thereby, the appeal effect and attractiveness when the organic light emitting device is used as an advertising display can be further improved.

In the present embodiment, the light emitting layer 58 of the first light emitting region 63 is formed by gravure offset printing using a combination of the gravure plate portion 14 of the ink plate 20 and the blanket portion 27 of the transfer roll 24. The light emitting layer 58 in the second light emitting region 64 is formed by flexographic printing using a combination of the anix plate portion 1 of the ink plate 20 and the flexo portion 23 of the transfer roll 24.
As described above, the rubber hardness of the flexo portion 23 is higher than the rubber hardness of the blanket portion 27, and the push amount during flexo printing by the flexo portion 23 is greater than the push amount during gravure offset printing by the blanket portion 27. Is also getting smaller. For this reason, the area of the 2nd light emission area | region 64 can be made smaller than 1 mm < ² >.
On the other hand, in the gravure offset printing by the blanket portion 27, as described above, the amount of pressing is larger than that in the case of flexographic printing. For this reason, the gravure offset printing by the blanket portion 27 is suitable for forming the first light emitting region 63 having an area of 1 mm ² or more.

Next, how the organic light emitting device 51 emits light will be described with reference to FIGS.
In the organic light emitting device 51 shown in FIG. 7A, all of the three first light emitting areas 63 of the fixed pattern area 61 are in a light emitting state, whereby the letters “ABC” are displayed large. On the other hand, in the variable pattern area 62, only the predetermined second light emitting area 64 is in a light emitting state, and the number “123” is displayed.
Also in the organic light emitting device 51 shown in FIG. 7B, all of the three first light emitting regions 63 of the fixed pattern region 61 are in a light emitting state, whereby the letters “ABC” are displayed in a large size. On the other hand, in the variable pattern area 62, only a predetermined second light emitting area 64 which is different from the case of FIG. 7A is in a light emitting state, thereby displaying a number “234”.
In this way, in the variable pattern area 62, arbitrary characters, symbols, figures, etc. are displayed by arbitrarily selecting the second light emitting area 64 to be in the light emitting state. In addition, the contents of the display can be changed according to time.

  Next, the layer configuration of the organic light emitting device 51 will be described. The fixed pattern region 61 and the variable pattern region 62 of the organic light emitting device 51 differ only in the pattern of a transparent electrode layer 53, an insulating layer 54, or a light emitting layer 58, which will be described later, and the layer configuration is substantially the same. Here, the layer configuration in the variable pattern region 62 will be described.

FIG. 8 is a cross-sectional view taken along line VIII-VIII in the variable pattern region 62 of the organic light emitting device 51 of FIG. As shown in FIG. 8, the organic light emitting device 51 includes a transparent substrate 52 and a plurality of transparent electrode layers (first electrode layers) 53 in a strip-like pattern extending on the transparent substrate 52 in the direction of the arrow c. An insulating layer 54 having a stripe-shaped opening 55, a light emitting element layer 56 disposed so as to cover the transparent electrode layer 53 in the opening 55, and the transparent electrode layer 53 on the light emitting element layer 56. And a plurality of electrode layers 60 (second electrode layers) in a belt-like pattern extending in the direction of the arrow d so as to be orthogonal to each other.
The opening 55 of the insulating layer 54 is a stripe-shaped opening along the direction of the arrow c, and is positioned on each transparent electrode layer 53 so that a desired portion of each transparent electrode layer 53 is exposed upward. ing. As can be seen from FIGS. 6 and 8, each opening 55 extends in a direction orthogonal to the printing direction P.

The light emitting element layer 56 is arranged in a predetermined pattern on the hole injection layer 57 and the hole injection layer 57 disposed so as to cover the insulating layer 54 and the transparent electrode layer 53 in each opening 55. And a hole injection layer 57 and an electron injection layer 59 disposed so as to cover the light emission layer 58. As will be described later with reference to FIG. 9C, the light emitting layer 58 includes a strip-shaped red light emitting layer 58R, green light emitting layer 58G, and blue light emitting layer 58B that are repeatedly arranged in this order in the direction of the arrow c. It may be. In this case, in the printing press 10, as the ink corresponding to each light emitting layer 58R, 58G, 58B, the red light emitting layer ink 30R, the green light emitting layer ink 30G, and the blue light emitting layer ink 30B are used.
Although the electron injection layer 59 is formed so as to cover the insulating layer 54, it may be formed only in a region that is a lower layer of the electrode layer 60.

  In such an organic light emitting device 51, a region where the transparent electrode layer 53 and the electrode layer 60 in a strip pattern intersect and the light emitting element layer 56 is formed in the opening 55 is a first light emitting region. 63 or a passive matrix type that becomes the second light emitting region 64. The light emitting layer 58 (the red light emitting layer 58R, the green light emitting layer 58G, and the blue light emitting layer 58B) is formed by the printing machine 10 as described later. For this reason, the thickness of the light emitting layer 58 can be uniformly set to 70 nm or more, whereby the luminance and efficiency at the time of light emission of the light emitting element layer 56 are high, and a high quality display is possible. Further, as described above, each of the layers 57, 58, 59 of the light emitting element layer 56 covers the insulating layer 54 and the transparent electrode layer 53 in each opening 55 in the lower layer region of the electrode layer 60. It is arranged. For this reason, it can prevent more reliably that the transparent electrode layer 53 and the electrode layer 60 which exist in the position which pinches | interposes the light emitting element layer 56 are short-circuited, and, thereby, can further improve reliability.

  Next, each component of the organic light emitting device 51 will be described in detail.

(Transparent substrate)
First, the transparent substrate 52 will be described in detail. In the case of the bottom emission method, the transparent base material 52 is provided on the surface on the viewer side, and is made of a material having such a transparency that the viewer can easily see the light from the light emitting layer 58. In the case where the direction in which the light from the light emitting layer 58 is extracted is the opposite direction (in the case of the top emission method), an opaque substrate may be used instead of the transparent substrate 52.
Examples of the transparent substrate 52 (including an opaque substrate instead) include a glass material, a resin material, or a composite material thereof, for example, a glass plate provided with a protective plastic film or a protective plastic layer. Used.

Examples of the resin material and protective plastic material constituting the transparent substrate 52 include fluorine resin, polyethylene, polypropylene, polyvinyl chloride, polyvinyl fluoride, polystyrene, ABS resin, polyamide, polyacetal, polyester, polycarbonate, modified polyphenylene ether, Polysulfone, polyarylate, polyetherimide, polyamideimide, polyimide, polyphenylene sulfide, liquid crystalline polyester, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyoxymethylene, polyethersulfone, polyetheretherketone, polyacrylate, acrylonitrile -Styrene resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin Polyurethane, silicone resin, amorphous polyolefins, and the like. Even other resin materials can be used as long as they are polymer materials that can be used for organic light emitting devices.
The thickness of the transparent substrate 52 is usually about 50 μm to 1.1 mm.

  Such a transparent substrate 52 is more preferable if it has a good gas barrier property such as water vapor or oxygen, although it depends on its application. Further, a gas barrier layer such as water vapor or oxygen may be formed on the transparent substrate 52. As such a gas barrier layer, for example, an inorganic oxide such as silicon oxide, aluminum oxide, titanium oxide or the like formed by a physical vapor deposition method such as a sputtering method or a vacuum vapor deposition method can be used.

(Transparent electrode layer)
Next, the transparent electrode layer 53 will be described in detail. In the example shown in FIG. 5, the transparent electrode layer 53 is an anode, and is disposed adjacent to the hole injection layer 57 in order to inject positive charges (holes) into the light emitting layer 58. The transparent electrode layer 53 may be a cathode, and in this case, the hole injection layer 57 and the electron injection layer 59 constituting the light emitting element layer 56 are replaced with each other.

The transparent electrode layer 53 is not particularly limited as long as it is used for a normal organic light emitting device, and a metal, an alloy, a mixture thereof, or the like can be used, for example, indium tin oxide (ITO), indium oxide. And thin film electrode materials such as indium zinc oxide (IZO), zinc oxide, stannic oxide, and gold. Among these, ITO, IZO, indium oxide, and gold which are transparent or translucent materials having a large work function (4 eV or more) are preferable so that holes can be easily injected.
The transparent electrode layer 53 preferably has a sheet resistance of several hundred Ω / □ or less, and depending on the material, the thickness of the transparent electrode layer 53 can be, for example, about 0.005 to 1 μm.
The transparent electrode layer 53 is arranged in a desired pattern shape from the peripheral terminal portion to the central pixel region. The transparent electrode layer 53 having such a pattern shape is formed by using a metal mask in a sputtering method, a vacuum evaporation method, or the like, or after forming a material for the transparent electrode layer on the entire surface, the photosensitive resist is masked. It is formed by etching.

The insulating layer 54 has a stripe-shaped opening 55 located on each transparent electrode layer 53. The insulating layer 54 is formed, for example, by first applying a photosensitive resin material over the entire surface so as to cover the transparent electrode layer 53, and then performing pattern exposure and development. Alternatively, the insulating layer 54 may be formed using a thermosetting resin material.
As will be described later, the portion where the insulating layer 54 is formed is a non-light emitting region. The thickness of the insulating layer 54 can be appropriately set according to the insulation resistance specific to the resin constituting the insulating layer 54, and can be set to about 0.05 to 5.0 μm, for example. In addition, carbon black, titanium black pigment such as titanium nitride, titanium oxide, or titanium oxynitride, or two or more kinds of light-shielding fine particles are mixed with the above-described resin material to form a black matrix. An insulating layer 54 may be formed.
Note that the shape of the insulating layer 54 is not limited to the above-described shape.

(Light emitting element layer)
Next, the light emitting element layer 56 will be described in detail. In the example shown in FIG. 8, the light emitting element layer 56 has a structure in which a hole injection layer 57, a light emitting layer 58, and an electron injection layer 59 are laminated from the transparent electrode layer 53 side. However, the structure is not limited to this, and a structure including the hole injection layer 57 and the light emitting layer 58, a structure including the light emitting layer 58 and the electron injection layer 59, and a hole injection layer 57 and the light emitting layer 58 are also included. A structure in which a hole transport layer (not shown) is interposed between the light emitting layer 58 and the electron injection layer 59 may be employed.
In addition, for the purpose of adjusting the light emission wavelength or improving the light emission efficiency, an appropriate material can be doped into each of the above layers.
Hereinafter, each layer of the light emitting element layer 56 will be described in detail.

The light emitting layer 58 of the light emitting layer light emitting element layer 56 includes a red light emitting layer 58R, a green light emitting layer 58G, and a blue light emitting layer 58B in the example shown in FIG. 9C later. However, it is not limited to such a structure, and a light emitting layer having a desired light emitting color (for example, yellow, light blue, orange) may be provided independently according to the purpose of use of the organic light emitting device, Alternatively, a desired combination of a plurality of emission colors other than red light emission, green light emission, and blue light emission may be provided.
As the organic light emitting material used for the light emitting layer 58, the materials mentioned in the description of the solid content of the ink 30 can be used.

The hole injection layer 57 of the hole injection layer light emitting element layer 56 is disposed so as to cover the insulating layer 54 and the transparent electrode layer 53 in each opening 55 as described above. Examples of the hole injection material for forming the hole injection layer 57 include phenylamine, starburst amine, phthalocyanine, oxides such as vanadium oxide, molybdenum oxide, ruthenium oxide, and aluminum oxide, amorphous carbon, and polyaniline. , Polythiophene derivatives, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazones Derivatives, stilbene derivatives, silazane derivatives, polysilanes, aniline copolymers, dielectric polymer oligomers such as thiophene oligomers, etc. Can.

  Furthermore, examples of the hole injection material include a porphyrin compound, an aromatic tertiary amine compound, and a styrylamine compound. Examples of the porphyrin compound include polyfin, 1,10,15,20-tetraphenyl-21H, 23H-polyfin copper (II), aluminum phthalocyanine chloride, copper octamethylphthalocyanine, and the like. In addition, aromatic tertiary amine compounds and styrylamine compounds include N, N, N ′, N′-tetraphenyl-4,4′-diaminophenyl, N, N′-diphenyl-N, N′-bis. (3-methylphenyl)-[1,1′-biphenyl] -4,4′-diamine, 4- (di-p-tolylamino) -4 ′-[4 (di-p-tolylamino) styryl] stilbene, 3, -Methoxy-4'-N, N-diphenylaminostilbenzene, 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl, 4,4 ', 4 "-tris [N- ( 3-methylphenyl) -N-phenylamino] triphenylamine and the like.

  The hole injection layer 57 formed of the above-described material is, for example, a mask having an opening corresponding to the image display region (a mask for preventing film formation on the electrode terminal including the transparent electrode layer 53 in the peripheral portion). ) Through a vacuum deposition method or the like. Alternatively, the hole injection layer 57 can be formed by a printing method such as a screen printing method.

Hole transport layer As a material for forming the hole transport layer, for example, oxadiazole, oxazole, triazole, thiazole, triphenylmethane, styryl, pyrazoline, hydrazone, aromatic amine, Examples thereof include carbazole, polyvinyl carbazole, stilbene, enamine, azine, triphenylamine, butadiene, polycyclic aromatic compound, and stilbene dimer.
Further, as the π-conjugated polymer, polyacetylene, polydiacetylene, poly (P-phenylene), poly (P-phenylene sulfide), poly (P-phenylene oxide), poly (1,6-heptadiene), poly (P— Phenylene vinylene), poly (2,5-thienylene), poly (2,5-pyrrole), poly (m-phenylene sulfide), poly (4,4'-biphenylene) and the like.
As the charge transfer polymer complex, polystyrene / AgC104, polyvinylnaphthalene / TCNE, polyvinylnaphthalene / P-CA, polyvinylnaphthalene / DDQ, polyvinylmesitylene / TCNE, polynaphthaacetylene / TCNE, polyvinylanthracene / Br2, polyvinylanthracene / I2 , Polyvinyl anthracene / TNB, polydimethylaminostyrene / CA, polyvinyl imidazole / CQ, poly-P-phenylene / I2, poly-1-vinylpyridine / I2, poly-4-vinylpyridine / I2, poly-P-1- Examples include phenylene, I2, polyvinylpyridium, TCNQ, and the like. Further, TCNQ-TTF and the like are exemplified as a charge transfer low molecular complex, and polycopper phthalocyanine and the like are exemplified as a polymer metal complex.
As the hole transport material, a material having a low ionization potential is preferable, and in particular, a butadiene system, an enamine system, a hydrazone system, and a triphenylamine system are preferable.

As a material for forming the electron injection layer The electron injection layer 59, for example, calcium, barium, aluminum lithium, lithium fluoride, strontium, magnesium oxide, magnesium fluoride, strontium fluoride, calcium fluoride, barium fluoride, aluminum oxide , Strontium oxide, calcium oxide, polymethyl methacrylate, sodium polystyrenesulfonate, nitro-substituted fluorene derivatives, anthraquinodimethane derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, heterocyclic tetracarboxylic anhydrides such as naphthaleneperylene, carbodiimide Fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives, and thiodiazole rings in which the oxygen atom is replaced with a sulfur atom. Examples include sol derivatives, quinoxaline derivatives having a quinoxaline ring known as an electron withdrawing group, metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum, phthalocyanines, metal phthalocyanines, distyrylpyrazine derivatives, and the like. it can. The electron injection layer 59 formed of such a material is, for example, a mask having an opening corresponding to an image display region (a mask for preventing film formation on an electrode terminal including the transparent electrode layer 53 in the peripheral portion). ) Through a vacuum deposition method or the like. The electron injection layer 59 can also be formed by a printing method such as a screen printing method.

  The thickness of each layer of the light emitting element layer 56 is not particularly limited, and can be, for example, about 10 to 1000 nm. Examples of materials doped in each layer of the light emitting element layer 56 include, for example, perylene derivatives, coumarin derivatives, rubrene derivatives, quinacridone derivatives, squalium derivatives, porphyrin derivatives, styryl dyes, tetracene derivatives, pyrazoline derivatives, decacyclene, phenoxazone. And the like.

(Electrode layer)
Next, the electrode layer 60 will be described in detail. In the example shown in FIG. 8, the electrode layer 60 is a cathode, and is disposed adjacent to the electron injection layer 59 in order to inject negative charges (electrons) into the light emitting layer 58. The electrode layer 60 may be an anode, and in this case, the hole injection layer 57 and the electron injection layer 59 constituting the light emitting element layer 56 are replaced with each other.
The material of the electrode layer 60 is not particularly limited as long as it is used for a normal organic light emitting device, and in the same manner as the transparent electrode layer 53 described above, indium tin oxide (ITO), indium oxide, oxide Thin film electrode materials such as indium zinc (IZO), zinc oxide, stannic oxide, or gold, magnesium alloys (eg, MgAg), aluminum or alloys thereof (AlLi, AlCa, AlMg, etc.), silver, etc. be able to. Among them, a magnesium alloy, aluminum, silver, or the like having a small work function (4 eV or less) is preferable so that electrons can be easily injected. Such an electrode layer 60 preferably has a sheet resistance of several hundred Ω / □ or less. For this reason, the thickness of the electrode layer 60 can be, for example, about 0.005 to 0.5 μm.
The electrode layer 60 can be formed by forming a film in a pattern shape by a method such as a sputtering method or a vacuum vapor deposition method through a mask using the electrode material described above.

  Next, the operation of the present embodiment having such a configuration will be described. Here, a method of forming the organic light emitting device 51 including the light emitting layer 58 will be described with reference to FIGS. 1 and 9.

  First, as illustrated in FIG. 9A, a transparent electrode layer 53 having a desired pattern is formed on a transparent substrate 52. The method for forming the transparent electrode layer 53 is not particularly limited, and a method for forming the transparent electrode layer 53 having a desired pattern by a sputtering method or a vacuum evaporation method using a metal mask, or a transparent electrode layer After forming the material over the entire surface of the transparent substrate 52, a method of forming the transparent electrode layer 53 having a desired pattern by etching using a photosensitive resist as a mask is appropriately selected.

  Next, as shown in FIG. 9B, an insulating layer 54 having a plurality of openings 55 that exposes a desired portion of the transparent electrode layer 53 upward is formed on the transparent substrate 52. In this case, first, a photosensitive resin material is applied to the entire surface so as to cover the transparent electrode layer 53, and then pattern exposure and development are performed on the applied photosensitive resin material. In this way, the insulating layer 54 having a plurality of openings 55 is formed.

  Thereafter, as shown in FIG. 9C, a hole injection layer 57 is formed so as to cover the transparent electrode layer 53 in the opening 55 and the insulating layer 54. The method for forming the hole injection layer 57 is not particularly limited. For example, the hole injection layer 57 is formed by a vacuum evaporation method or the like through a photomask having openings corresponding to the fixed pattern region 61 and the variable pattern region 62. Can be formed.

  Next, as shown in FIG. 9D, a light emitting layer 58 is formed on the hole injection layer 57. The light emitting layer 58 is formed using the printing machine 10 described above.

  Hereinafter, a method for forming the light emitting layer 58 using the printer 10 will be described in detail. First, the ink 30 containing the organic light emitting material used as the material of the light emitting layer 58 is filled into the cell 15 of the gravure plate portion 14 and the cell 2 of the anilox plate portion 1 of the ink plate 20 using the doctor 8. Next, the transfer roll 24 is run on the ink plate 20, whereby the ink 30 is received from the cell 15 of the gravure plate portion 14 of the ink plate 20 to the blanket portion 27 of the transfer roll 24, and the anilox of the ink plate 20 is also received. The ink 30 is received from the cell 2 of the plate part 1 to the flexo part 23 of the transfer roll 24. Thereafter, the transfer roll 24 is caused to travel toward the base plate 6.

Next, the transfer roll 24 is caused to travel on the transparent substrate 52 on the substrate surface plate 6. As a result, in the fixed pattern region 61, the ink 30 is gravure offset printed on the hole injection layer 57 at a predetermined printing pressure by the blanket portion 27. At the same time, in the variable pattern area 62, the ink 30 is flexographically printed on the hole injection layer 57 in a predetermined pattern shown in FIG. At this time, printing may be performed so that the red light emitting layer ink 30R, the green light emitting layer ink 30G, and the blue light emitting layer ink 30B are arranged in this order.
Thereafter, the transferred ink 30 is appropriately dried to form the light emitting layer 58 (the red light emitting layer 58R, the green light emitting layer 58G, and the blue light emitting layer 58B) on the hole injection layer 57.

  Thereafter, as shown in FIG. 9E, an electron injection layer 59 is formed so as to cover the hole injection layer 57 and the light emitting layer 58. The method for forming the electron injection layer 59 is not particularly limited. For example, as in the case of forming the hole injection layer 57, a photomask having openings corresponding to the fixed pattern region 61 and the variable pattern region 62. The film can be formed by vacuum deposition or the like.

  Finally, the electrode layer 60 is formed in a predetermined pattern shape so as to be connected to the light emitting element layer 56 located in the desired opening 55 of the light emitting element layer 56. In this way, the organic light emitting device 51 shown in FIG. 8 is formed.

  In the organic light emitting device 51 thus formed, the light emitting element layer 56 is a region where the light emitting element layer 56 is formed in the opening 55, and the light emitting element layer 56 is interposed between the transparent electrode layer 53 and the electrode layer 60. The light emitting region is defined by the formed region. The light emitting region thus defined is a region that emits light when a voltage is applied between the transparent electrode layer 53 and the electrode layer 60. Here, as shown in FIG. 9 (f), the light emitting region in the fixed pattern region 61 of the organic light emitting device 51 is the first light emitting region 63, and the light emitting region in the variable pattern region 63 is the second light emitting region 64. It has become. Further, as described above, the light emitting layer 58 in the first light emitting region 63 is formed by gravure offset printing using a combination of the gravure plate portion 14 of the ink plate 20 and the blanket portion 27 of the transfer roll 24. The light emitting layer 58 in the second light emitting region 64 is formed by flexographic printing using a combination of the anix plate portion 1 of the ink plate 20 and the flexo portion 23 of the transfer roll 24.

  By the way, according to the present embodiment, as described above, in the transfer roll 24, the upper surface 23 c of the convex portion 23 a of the flexo portion 23 is more inward of the transfer roll 24 than the ink receiving surface formed by the outer surface 27 b of the blanket portion 27. Retracted by Δh. For this reason, when the light emitting layer 58 is formed by the printing machine 10, the printing pressure in the gravure offset printing by the blanket unit 27 is larger than the printing pressure of the flexo printing pressure by the flexo unit 23. For this reason, the light emitting layer 58 having a large area and a uniform thickness can be formed by gravure offset printing using the blanket portion 27, and at the same time, the light emitting layer 58 having a fine and uniform thickness can be formed by flexographic printing using the flexo portion 23. Thereby, in both the first light emitting region 63 and the second light emitting region 64, it is possible to realize a high-quality display with high luminance and efficiency during light emission of the light emitting element layer 56.

  In the present embodiment, a region where the light emitting element layer 56 is formed in the opening 55 and a region where the light emitting element layer 56 is formed between the transparent electrode layer 53 and the electrode layer 60. The example in which the light emitting area is defined by the above is shown. However, the present invention is not limited to this, and the light emitting region may be defined by the opening 55 of the insulating layer 54.

  For example, consider a case where an insulating layer 54 having openings 55 having a pattern as shown in FIG. 10A is formed on the transparent electrode layer 53. Here, the opening in the portion where the fixed pattern region 61 is formed is the first opening 55A, and the opening in the portion where the variable pattern region is formed is the second opening 55B. In this case, after the insulating layer 54 is formed, as shown in FIG. 10B, the hole injection layer 57, the light emitting layer 58, and the electron injection layer 59 are sequentially formed so as to cover at least the openings 55A and 55B. The Next, as shown in FIG. 10C, the electrode layer 60 is formed on the electron injection layer 59.

  Here, when the organic light emitting device 51 is viewed from above, the current flow between the transparent electrode layer 53 and the electrode layer 60 is blocked by the insulating layer 54 in the region where the insulating layer 54 is formed. Therefore, a region where the insulating layer 54 is formed becomes a non-light emitting region, and a region where the openings 55A and 55B of the insulating layer 54 are formed becomes a light emitting region. That is, as shown in FIGS. 10A and 10C, the first light emitting region 63 of the fixed pattern region 61 is defined by the first opening 55A, and the second opening of the variable pattern region 62 is formed by the second opening 55B. A light emitting area 64 is defined.

At this time, the area of the first opening 55A is at least 1 mm ² or more, and the area of the second opening 55B is smaller than 1 mm ² . Therefore, the area of the first light emitting region 63 in the fixed pattern region 61 can be at least 1 mm ² or more, and the area of the second light emitting region 64 in the variable pattern region 62 can be made smaller than 1 mm ² . That is, the areas of the light emitting regions 63 and 64 can be arbitrarily set by appropriately setting the areas of the openings 55A and 55B.

[Modification of printing press]
Modification 1 of printing machine
In the printing press 10, the arrangement of the gravure plate portion 14 or the anilox plate portion 1 in the ink plate 20 is not particularly limited, and similarly, the arrangement of the blanket portion 27 or the flexo portion 23 in the transfer roll 24 is particularly limited. Nor. For example, as shown in FIG. 11, in the transfer roll 24, the blanket part 27 and the flexo part 23 may be arranged along the rotation direction R of the transfer roll 24. In this case, the gravure plate portion 14 and the anilox plate portion 1 are arranged along the printing direction P in the ink plate 20 so as to correspond to the blanket portion 27 and the flexo portion 23 of the transfer roll 24.

Modification 2 of printing machine
Further, in the present embodiment, an example in which the backup body that sandwiches the base material 52 with the transfer roll 24 includes the flat plate-shaped printing surface plate 6 is shown. However, the present invention is not limited to this, and as shown in FIG. 12, the backup body may be composed of a roll-shaped impression cylinder 6 a that sandwiches the substrate 52 with the transfer roll 24. In this case, first, the ink 30 is supplied to the upper surface of the ink plate 20 by the ink supply unit 7, and then the unnecessary ink 30 on the upper surface of the ink plate 20 is scraped off by the doctor 8. Thereafter, the ink 30 on the upper surface of the ink plate 20 is received by the transfer roll 24. Next, the ink 30 of the transfer roll 24 is transferred onto the substrate 52 being conveyed on the impression cylinder 6a.

Modification 3 of printing machine
Moreover, in this Embodiment, the ink plate showed the example which consists of the ink plate 20 which has a flat shape. However, the present invention is not limited to this, and as shown in FIG. 13, the ink plate may include an ink plate cylinder 20 a having a roll shape. In this case, the gravure plate portion 14 having a plurality of cells 15 and the anilox plate portion 1 having a plurality of cells 2 are formed on the outer peripheral surface of the ink plate cylinder 20a as in the case of the plate-shaped ink plate 20. Has been. As in the case of the plate-shaped ink plate 20, the ink 30 of the gravure plate portion 14 of the ink plate cylinder 20a is received by the blanket portion 27 of the transfer roll 24, and the ink 30 of the anilox plate portion 1 of the ink plate cylinder 20a is It is received by the flexo part 23 of the transfer roll 24.

  In the printing press 10 provided with the roll-shaped ink plate cylinder 20a, as shown in FIG. 13, first, the ink 30 is supplied to the outer peripheral surface of the ink plate cylinder 20a by the ink pan 7a (ink supply unit), and then the doctor 8, the unnecessary ink 30 on the outer peripheral surface of the ink plate cylinder 20a is scraped off. Thereafter, the ink 30 on the upper surface of the ink plate 20 is received by the transfer roll 24. Next, the ink 30 of the transfer roll 24 is transferred onto the substrate 52 being conveyed on the impression cylinder 6a.

Modification 4 of printing machine
In the printing machine 10, an example in which the resin film 27 a constituting the blanket portion 27 of the transfer roll 24 is integrally provided on the peripheral surface of the center roll 25 of the transfer roll 24 is shown. However, the present invention is not limited to this, and as shown in FIG. 14, the resin film 27 a may be conveyed along with the rotation of the center roll 25 so as to be wound around the center roll 25. In this case, in a range including at least a position for receiving the ink 30 from the ink plate cylinder 20a (position indicated by the arrow e) and a position for transferring the ink 30 to the base material 52 (position indicated by the arrow f), A resin film 27 a is wound around the center roll 25.

[Modification of ink plate]
Further, in the ink plate 20 of the present embodiment, an example is shown in which the cells of the gravure plate portion 14 are formed of cells 15 having a stripe shape. However, the present invention is not limited to this, and the cells 15 of the gravure plate portion 14 may be composed of cells 15 arranged in a grid pattern on the gravure plate portion 14. Similarly, the cells 2 of the anilox plate portion 1 may be composed of cells 2 arranged in a lattice pattern on the anilox plate portion 1.

  For example, as shown in FIG. 15, the cells 15 of the gravure plate portion 14 may have a plurality of sections (in the example shown in FIG. 15, each cell 15 is a square). In this case, a non-cell portion 16 exists between the cells 15. Similarly, for the cell 2 of the anilox plate portion 1, as shown in FIG. 15, the cell 2 of the anilox plate portion 1 is divided into a plurality of shapes (in the example shown in FIG. 15, each cell 2 is square). You may have. Moreover, as shown in FIG. 16, each cell 2 and 15 may have a rhombus shape. Furthermore, as shown in FIG. 17, each cell 2 and 15 may have an elliptical shape.

In each cell 2 and 15 shown in FIGS. 15 to 17, the maximum width b in the printing direction (direction indicated by the arrow P in the drawing) in each cell 2 and 15 (shaded portion) is perpendicular to the printing direction. The ratio b / a of the maximum width a is preferably 0.6 or more, and the upper limit is not particularly limited. Further, the total cell area occupying the film forming site is preferably in the range of 55 to 95%, and the width of the non-cell portions 3 and 16 (non-cell portion lengths S ₃ and S ₄ ) is 2 to 500 μm, preferably 10 to The depth of each cell 2 and 15 (plate depth) is 15 to 100 μm, preferably 15 to 80 μm.

If the ratio b / a is less than 0.6, it is difficult to form a thick film, and it becomes difficult to form the light emitting layer 58 having a thickness of 70 nm or more in the formation of the light emitting layer 58. Further, if the total cell area in the film formation site is less than 55%, it is difficult to form a thick film, and if it exceeds 95%, the film thickness variation is unfavorable. In addition, if the width of the non-cell portions 3 and 16 (non-cell portion lengths S ₃ and S ₄ ) is less than 2 μm, it is difficult to form each cell 2 and 15, and if it exceeds 500 μm, the variation in film thickness is large. And it is not preferable because thick film formation becomes difficult. Further, when the depth (plate depth) of each cell 2 and 15 is less than 15 μm, it becomes difficult to form a thick film, and even if the plate depth exceeds 100 μm, the thickness of the coating film to be formed does not increase.
The shape of each of the cells 2 and 15 described above is an exemplification, and is not limited to the above-described form.

[Modification of transfer roll]
Further, in the present embodiment, an example is shown in which the transfer roll 24 includes a central roll 25 serving as an axis, and a flexo portion 23 and a blanket portion 27 provided on the outer periphery of the central roll 25. However, the present invention is not limited to this, and as shown in FIG. 18, the transfer roll 24 is provided on the center roll 25, the cylindrical plastic sleeve 26 surrounding the center roll 25, and the outer periphery of the plastic sleeve 26. It may consist of a flexo part 23 and a blanket part 27. In this case, the method for fixing the plastic sleeve 26 on the center roll 25 is not particularly limited. For example, the plastic sleeve 26 may be secured on the central roll 25 by an air clamp mechanism (not shown) disposed in the central roll 25, or the plastic sleeve 26 may be disposed in the central roll 25. It may be fixed on the center roll 25 by a suction mechanism (not shown).

[Modification of organic light-emitting device]
Further, in the present embodiment, an example in which the organic light emitting device is the passive matrix organic light emitting device 51 in which the portion where the transparent electrode layer 53 and the electrode layer 60 in the strip pattern intersect is the light emitting region is shown. However, the present invention is not limited to this, and the organic light emitting device may be an active matrix type.

  19 and 20 are diagrams for explaining an example of an active matrix type organic light-emitting device of the present invention. FIG. 19 is a diagram showing an electrode wiring pattern. An electrode wiring pattern 73 formed on a transparent substrate (not shown) includes a signal line 73A, a scanning line 73B, a TFT (thin film transistor) 73C, and a transparent electrode (pixel electrode). ) Layer 73D. Further, an insulating layer 74 (a hatched portion in FIG. 19) is formed so as to cover these electrode wiring patterns 73, and this insulating layer 74 has an opening 75 located on each transparent electrode layer 73D. It has. In addition, a light emitting element layer (not shown) is formed on the insulating layer 74 so as to cover the transparent electrode layer 73D in each opening 75, and an electrode (common electrode) layer (not shown) is formed on the light emitting element layer. Is provided.

  The light emitting element layer includes a hole injection layer disposed so as to cover the insulating layer 74 and the transparent electrode layer 73D in each opening 75, and a transparent electrode layer 73D (hole injection in the opening 75). A plurality of light emitting layers disposed in each opening 75 so as to cover the layer, and an electron injection layer disposed so as to cover these layers. FIG. 20 is a diagram showing the relationship between the opening 75 of the insulating layer 74 and the light emitting layer. In FIG. 20, the light emitting layer includes a red light emitting layer 78R, a green light emitting layer 78G, and a blue light emitting layer 78B having a desired pattern shape larger than the opening 75.

In such an active matrix organic light emitting device of the present invention, the light emitting layer (red light emitting layer 78R, green light emitting layer 78G, blue light emitting layer 78B) is formed by the light emitting layer forming method of the present invention, For this reason, the variation in the thickness of the light emitting layer (red light emitting layer 78R, green light emitting layer 78G, blue light emitting layer 78B) is reduced. This enables high-quality display with high luminance and efficiency when the light-emitting element layer emits light. Further, when the light emitting element layer is formed so as to run over the insulating layer 74 at the periphery of the opening 75, a short circuit occurs between the transparent electrode layer 73D and the electrode layer (not shown) existing at the position sandwiching the light emitting element layer. And reliability is further improved.
In addition, the light emitting element layer has a structure composed of a hole injection layer and a light emitting layer, a structure composed of a light emitting layer and an electron injection layer, and a hole injection layer and a light emitting layer. And a structure in which an electron transport layer is interposed between the light emitting layer and the electron injection layer.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

[Example 1]
The ink 30 was printed on the base material 52 using the printing machine 10 of the present invention.
As the ink 30, an ink having a viscosity (ink temperature: 23 ° C.) at a shear rate of 100 / sec of 80 cp and a boiling point of 186 ° C. was used. The weight% of the solid content of the ink 30 was 2.5% by weight, and the surface tension of the solvent of the ink 30 was 32 dyne / cm.
As for the transfer roll 24, the difference Δh between the height of the upper surface 23c of the convex portion 23a of the flexo portion 23 and the height of the outer surface 27b of the blanket portion 27 is different by 0.1 mm from −0.1 to +0.8 mm. A total of 10 types of transfer rolls were used. Note that a positive value of Δh means that the upper surface 23 c of the convex portion 23 a of the flexo portion 23 is recessed inward from the outer surface 27 b of the blanket portion 27.

Ten types of printing were performed using the above-described ten types of transfer rolls 24. In each printing, the thickness (film thickness) of the printed matter formed by the flexo part 23 and the blanket part 27 of the transfer roll 24 was measured at a plurality of points. Next, the average value (average film thickness), maximum value (film thickness max), and minimum value (film thickness min) of the film thickness measured at a plurality of points were calculated. Thereafter, the film thickness fluctuation rate (%) was calculated based on the average value, the maximum value, and the minimum value. The film thickness variation rate (%) is specifically derived from the following equation.
Film thickness variation rate (%) = {(film thickness max−film thickness min) / average film thickness} × 100

Table 1 shows the results of evaluating the film thickness variation rate of the printed matter 30a by changing Δh in the transfer roll 24 of the printing press 10 in increments of 0.1 mm from −0.1 to +0.8 mm. In Table 1, the case where the film thickness variation rate is within 5% is determined as “OK”, and the case where the film thickness variation rate is greater than 5% is determined as “NG”.

  As shown in Table 1, when Δh is in the range of 0.1 to 0.5 mm, the film thickness variation of the printed matter formed on the base material 52 by the flexo part 23 and the blanket part 27. Each rate was within 5%. In particular, when Δh is in the range of 0.2 to 0.4 mm, the variation rate of the film thickness of the printed material formed on the substrate 52 is within 4%, which is more preferable.

DESCRIPTION OF SYMBOLS 1 ... Anilox plate part 2 ... Cell 3 ... Non-cell part 5 ... Frame 6 ... Base plate 6a ... Impression cylinder 7 ... Ink supply part 7a ... Ink pan 8 ... Doctor system 8a ... 1st doctor 8b ... 2nd doctor 10 ... Printing machine 14 ... Gravure plate 15 ... Cell 16 ... Non-cell 20 ... Ink plate 23 ... Flexo 23a ... Convex 23b ... Concave 23c ... Upper surface 24 ... Transfer roll 25 ... Center roll 26 ... Plastic sleeve 27 ... Blanket 27a ... resin film 27b ... outer surface 30 ... ink 51 ... organic light emitting device 52 ... transparent substrate 53 ... transparent electrode layers 54, 74 ... insulating layers 55, 75 ... opening 56 ... light emitting element layer 57 ... hole injection layer 57a ... positive Hole transport layer 58, 58R, 58G, 58B, 78R, 78G, 78G... Light emitting layer 59... Electron injection layer 60... Electrode layer 61. Emission region 63 ... first light-emitting area 64 ... second emission region 73 ... electrode wiring pattern

Claims (23)

Frame,
A plate-shaped ink plate disposed on the frame and having a gravure plate portion and an anix plate portion on its upper surface;
An ink supply unit for supplying ink to the gravure plate part and the anix plate part of the ink plate;
A transfer roll for receiving the ink in contact with the gravure plate portion and the anix plate portion of the ink plate;
A backup body that sandwiches the substrate with the transfer roll and transfers the ink on the transfer roll onto the substrate, and
The transfer roll is provided on a center roll, a center roll, a blanket part made of an elastic material that receives ink from the gravure plate part of the ink plate and transfers the ink onto the base material, and a center roll A flexo part made of an elastic material that receives ink from the anix plate part of the ink plate and transfers the ink onto the substrate, and
The blanket part includes an ink receiving surface that receives ink from a gravure plate part of the ink plate,
The flexo portion includes a convex portion that receives ink from the anix plate portion of the ink plate, and a concave portion that does not receive ink from the anix plate portion,
The printing machine according to claim 1, wherein the convex portion of the flexo portion is retracted inside the transfer roll from the ink receiving surface of the blanket portion. A roll-shaped ink plate, an ink plate having a gravure plate portion and an anix plate portion on its outer peripheral surface;
An ink supply unit for supplying ink to the gravure plate part and the anix plate part of the ink plate;
A transfer roll for receiving the ink in contact with the gravure plate portion and the anix plate portion of the ink plate;
An impression cylinder that sandwiches the base material with the transfer roll and transfers the ink on the transfer roll onto the base material.
The transfer roll is provided on a center roll, a center roll, a blanket part made of an elastic material that receives ink from the gravure plate part of the ink plate and transfers the ink onto the base material, and a center roll A flexo part made of an elastic material that receives ink from the anix plate part of the ink plate and transfers the ink onto the substrate, and
The blanket portion includes a first ink receiving surface that receives ink from a gravure plate portion of the ink plate,
The flexographic plate portion includes a convex portion that receives ink from the anix plate portion of the ink plate, and a concave portion that does not receive ink from the anix plate portion,
The printing machine according to claim 1, wherein the convex portion of the flexographic plate portion is retracted inside the transfer roll from the ink receiving surface of the blanket portion.   The printing machine according to claim 1, wherein the convex portion of the flexographic plate portion is retracted inward of the transfer roll by 0.1 to 0.5 mm from the ink receiving surface of the blanket portion.   The printing press according to any one of claims 1 to 3, wherein the ink has a viscosity (ink temperature 23 ° C) at a shear rate of 100 / sec in a range of 51 to 200 cP. The ink is composed of a solvent and a solid content dissolved in the solvent,
The printing press according to any one of claims 1 to 4, wherein the solvent has a surface tension of 37 dyne / cm or less and a boiling point in a range of 165 to 250 ° C.   The printing machine according to claim 5, wherein the solid content in the ink is in the range of 1.5 to 3.5 wt%.   The printing press according to claim 1 or 2, wherein the blanket portion of the transfer roll is made of a resin film having a surface tension of 35 dyne / cm or more.   The printing machine according to claim 7, wherein the resin film has a thickness in a range of 5 to 200 µm.   The printing press according to claim 7 or 8, wherein the blanket portion of the transfer roll is integrally provided with the resin film on a peripheral surface of a center roll of the transfer roll. The blanket portion of the transfer roll is made of a resin film having a surface tension of 35 dyne / cm or more,
The resin film is conveyed in a state of being wound around a rotating central roll in a range including at least a position where ink is received from the gravure plate portion and a position where ink is transferred onto the substrate. The printing machine according to claim 2, wherein:   The printing press according to claim 9 or 10, wherein a cushion layer is interposed between the center roll and the blanket portion.   The printing press according to claim 1, wherein the flexographic portion of the transfer roll is made of a water-developable resin material.   The printing press according to claim 1, wherein the flexographic portion of the transfer roll is made of a resin material capable of laser engraving.   The printing press according to claim 1 or 2, wherein the flexographic portion of the transfer roll is fixed to the peripheral surface of the central roll of the transfer roll with an adhesive material. The transfer roll comprises a center roll, a cylindrical plastic sleeve surrounding the center roll, and a blanket part and a flexo part provided on the outer periphery of the plastic sleeve,
The printing press according to claim 1 or 2, wherein the plastic sleeve is fixed on the center roll by an air clamp mechanism disposed in the center roll. The transfer roll comprises a center roll, a cylindrical plastic sleeve surrounding the center roll, and a blanket part and a flexo part provided on the outer periphery of the plastic sleeve,
The printing press according to claim 1 or 2, wherein the plastic sleeve is fixed on the center roll by an adsorption mechanism disposed in the center roll. The method of forming the said light emitting layer of the organic light emitting device provided with the electrode which opposes and the said light emitting element layer which has at least a light emitting layer between the said electrodes with the printing machine in any one of Claims 1 thru | or 16. In
Filling the gravure plate part and the anix plate part of the ink plate with ink containing at least an organic light emitting material; and
Receiving the ink from the gravure plate portion and the anix plate portion to the transfer roll; and
Transferring the ink on the transfer roll onto a substrate, and
The transfer roll is provided on a center roll, a center roll, a blanket part made of an elastic material that receives ink from the gravure plate part of the ink plate and transfers the ink onto the base material, and a center roll A flexo part made of an elastic material that receives ink from the anix plate part of the ink plate and transfers the ink onto the substrate, and
The blanket part includes an ink receiving surface that receives ink from a gravure plate part of the ink plate,
The flexo portion includes a convex portion that receives ink from the anix plate portion of the ink plate, and a concave portion that does not receive ink from the anix plate portion,
The method for forming a light emitting layer, wherein the convex portion of the flexo portion is recessed inward from the ink receiving surface of the blanket portion. In a method of forming an organic light-emitting device comprising opposing electrodes and a light-emitting element layer having at least a light-emitting layer disposed between the electrodes,
Preparing a substrate;
Forming a first electrode layer having a desired pattern on the substrate;
Forming an insulating layer having a plurality of openings exposing a desired portion of the first electrode layer on the base;
Forming a light emitting element layer having at least a light emitting layer in the opening;
Forming a second electrode layer so as to be connected to a light emitting element layer located in a desired opening of the light emitting element layer,
The light emitting layer of the said light emitting element layer is formed by the method of Claim 17, The formation method of the organic light emitting device characterized by the above-mentioned. A light emitting region is defined by a region in which the light emitting element layer is formed in the opening and a region in which the light emitting element layer is formed between the first electrode layer and the second electrode layer,
The light emitting region includes at least one first light emitting region and a plurality of second light emitting regions,
The area of the first light emitting region is larger than the area of the second light emitting region,
The light emitting layer of the light emitting element layer in the first light emitting region is formed from ink transferred from the blanket part,
The method of forming an organic light emitting device according to claim 18, wherein the light emitting layer of the light emitting element layer in the second light emitting region is formed of ink transferred from the flexo portion. The area of the first light emitting region is 1 mm ² or more,
The method of forming an organic light emitting device according to claim 19, wherein an area of the second light emitting region is smaller than 1 mm ² . The light emitting region composed of the first light emitting region and the second light emitting region is defined by the opening of the insulating layer,
21. The method for forming an organic light emitting device according to claim 19, wherein in the step of forming the light emitting element layer, the light emitting element layer is formed so as to cover the insulating layer and the opening. A substrate;
A first electrode layer formed in a desired pattern on the substrate;
An insulating layer formed on the substrate and having a plurality of openings exposing a desired portion of the first electrode layer upward;
A light emitting element layer formed in each opening to cover the first electrode layer in each opening and having at least a light emitting layer;
A second electrode layer formed to be connected to a light emitting element layer located in a desired opening of the light emitting element layer,
A light emitting region is defined by a region in which the light emitting element layer is formed in the opening and a region in which the light emitting element layer is formed between the first electrode layer and the second electrode layer,
The light emitting region includes at least one first light emitting region and a plurality of second light emitting regions,
The area of the first light emitting region is 1 mm ² or more,
2. An organic light emitting device, wherein the area of the second light emitting region is smaller than 1 mm ² . The light emitting region composed of the first light emitting region and the second light emitting region is defined by the opening of the insulating layer,
The opening includes a first opening corresponding to the first light emitting region and a second opening corresponding to the second light emitting region,
The area of the first opening is 1 mm ² or more,
The organic light-emitting device, wherein the area of the second opening is smaller than 1 mm ² .

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