JP2011198577A - Apparatus and method for manufacturing light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for manufacturing a light emitting device, capable of reducing a manufacturing cost by improving the efficiency of using an organic EL material.SOLUTION: A controller 301 of a printing device 300 controls a head 303 to discharge ink as a material for an organic layer toward an anilox roll 310 in accordance with a printing pattern previously stored in a storage part 302. At this point, the controller 301 controls it to selectively discharge the ink into a region on the anilox roll 310 corresponding to the printing pattern to form an ink film 341. Then, the ink is transferred from the anilox roll 310 to a plate cylinder 320 having a flexographic plate, and the plate cylinder 320 prints the ink on a substrate 31 to form the organic layer.

Description

  The present invention relates to a light emitting device manufacturing apparatus and a manufacturing method.

  A self-luminous element called an organic electroluminescence element (organic EL element) or an organic light emitting diode element is formed of a fluorescent organic compound that emits light when an electric field is applied. A display device including a display panel having this element in each pixel has attracted attention as a next-generation display device.

  The organic EL element is formed between a pair of electrodes of an anode electrode and a cathode electrode, and includes an organic EL layer (organic layer) having, for example, a light emitting layer, a hole injection layer, and the like. The organic EL element emits light by energy generated by recombination of holes and electrons in the light emitting layer.

  In order to form such an organic layer, it has been conventionally performed to form a predetermined polymer material on a substrate by printing using a flexographic printing plate, which is a type of relief printing, as an ink (hereinafter referred to as flexographic printing). (For example, patent document 1). In flexographic printing, by using a low-viscosity ink, it is possible to make a thin light-emitting layer or the like formed on a substrate. In flexographic printing, for example, a printing cylinder formed in a roller shape and an anilox roll are driven by a direct drive motor or the like, thereby enabling precise printing. For these reasons, flexographic printing can be suitably used for patterning the organic EL organic layer.

JP 2007-299616 A

  However, the conventional flexographic printing method has the following problems. The ink supplied from the dispenser (ink chamber in Patent Document 1) so as to spread over the entire surface of the anilox roll is transferred to a flexographic plate on which a printing pattern wound around a plate cylinder is formed. When the flexographic plate comes into contact with the substrate to be printed, ink is printed on the substrate. At that time, excess ink remaining on the anilox roll is removed by a scraper (doctor) and discarded. Therefore, the conventional flexographic printing method requires a large amount of ink in which an expensive organic EL material is dissolved, and the use efficiency of the organic EL material is lowered. Therefore, there is a problem that the manufacturing cost of the light emitting device increases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a light emitting device manufacturing apparatus and a manufacturing method capable of improving the use efficiency of an organic EL material and reducing the manufacturing cost. .

In order to achieve the above object, a light-emitting device manufacturing apparatus according to the first aspect of the present invention provides:
A light-emitting device manufacturing apparatus comprising a plurality of light-emitting elements arranged on a substrate,
A rotary plate cylinder provided with a flexographic plate for printing an ink for forming an organic layer of the light emitting element on the substrate;
An intermediate transfer member that contacts the flexographic plate and transfers the ink;
A head portion for supplying the ink to the intermediate transfer member;
A storage unit for storing an ink supply pattern on the surface of the intermediate transfer member corresponding to the printed pattern of the substrate;
A control unit that supplies the ink from the head unit in the region of the ink supply pattern of the intermediate transfer member,
It is characterized by that.
In this case, the apparatus further includes a head driving unit that moves the head unit to a position facing the ink supply pattern.
It is good as well.
Further, the head unit ejects the ink onto the intermediate transfer member by an inkjet method.
It is good as well.
In addition, the head unit includes a plurality of nozzles in which positions for ejecting the ink are fixed,
Each of the plurality of nozzles includes a piezo element that discharges the ink as a droplet by an inkjet method,
The storage unit stores operation waveforms of the piezo elements,
The control unit controls the ejection amount of the ink from each of the piezoelectric elements to be uniform based on the operation waveform;
It is good as well.
Further, the light emitting element is an organic electroluminescence element,
The ink includes a material that becomes an organic layer of an organic electroluminescence element.
It is good as well.
The intermediate transfer member is a rotary anilox roll.
It is good as well.
The intermediate transfer member is a plate-shaped anilox plate.
It is good as well.
In order to achieve the above object, a method for manufacturing a light emitting device according to the second aspect of the present invention includes:
Forming one or a plurality of the organic layers on the substrate using the light emitting device manufacturing apparatus described above;
It is characterized by that.
A method for manufacturing a light emitting device according to the third aspect of the present invention includes:
A step of selectively supplying ink containing an organic layer material of a light emitting element to a region of the surface of the intermediate transfer member that is in contact with the flexographic plate of the plate cylinder by an inkjet method;
Transferring the ink from the intermediate transfer member to the flexographic plate of the plate cylinder;
Printing the ink on the substrate from the plate cylinder,
It is characterized by that.

  According to the present invention, the manufacturing cost of the light emitting device can be reduced.

1 is a schematic diagram illustrating a configuration of a printing apparatus according to an embodiment of the present invention. It is a block diagram which shows the main structures of a printing apparatus. It is a figure which shows the transfer operation | movement of the ink from an anilox roll to a plate cylinder. It is a figure which shows the printing operation from a printing cylinder to a board | substrate. It is a top view which shows the structural example of a light-emitting device. It is an equivalent circuit diagram of an example of the drive circuit of a pixel. It is a top view of a pixel. It is the VIII-VIII sectional view taken on the line shown in FIG. (A)-(c) is a figure which shows the manufacturing method of a light-emitting device. (A)-(c) is a figure which shows the manufacturing method of a light-emitting device following FIG. (A) And (b) is a figure which shows the electronic device with which a light-emitting device is used. It is a figure which shows the electronic device with which a light-emitting device is used. It is a figure which shows the electronic device with which a light-emitting device is used. It is a figure which shows the electronic device with which a light-emitting device is used. (A) And (b) is a schematic diagram which shows the structural example of a head.

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

  As illustrated in FIG. 1, the printing apparatus 300 according to the present embodiment includes a control unit 301, a storage unit 302, a head 303, an ink storage unit 304 that stores ink 340, an anilox roll 310, and a plate cylinder 320. And a printing stage 330.

  The control unit 301 includes a CPU (Central Processing Unit) and the like, and controls the overall functions of the printing apparatus 300, such as ejection of ink from a head 303, which will be described later, and driving of an anilox roll 310 and a plate cylinder 320.

  The storage unit 302 is a storage device including a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The storage unit 302 stores, for example, a program executed by the control unit 301, data related to a printing pattern by the plate cylinder 320, and the like. The storage unit 302 operates as a work memory when the control unit 301 executes a program, for example.

  The head 303 discharges ink 340 from the head 303 toward the anilox roll 310 based on an instruction from the control unit 301. In this embodiment, the head 303 includes a piezo element (not shown), and ejects the ink 340 by a so-called inkjet method. Further, the head 303 is configured to be able to eject ink 340 while scanning in the X-axis direction in the figure in accordance with the length of the anilox roll 310. The ink storage unit 304 stores ink 340 therein and supplies the ink 340 to the head 303. The ink 340 in the present embodiment is a solution of a predetermined polymer material that is a material of an organic EL, for example, a light emitting layer.

  The anilox roll 310 is supported so as to be rotatable about the X-axis direction in the figure, and has a predetermined length in the X-axis direction. A large number of cells 311 that are shallow concave portions are formed on the outer peripheral surface of the anilox roll 310, that is, the surface that receives the ink 340. In this specification, the cells 311 are displayed in a simplified manner, but the cells 311 are provided to have a predetermined depth, pattern, and the like according to printing conditions. In addition, if the head 303 has a structure in which a plurality of ejection openings for arbitrarily ejecting the ink 340 are arranged along the X axis according to a predetermined length in the X axis direction of the anilox roll 310, the head 303 is arranged. The ink 340 can be ejected into any cell 311 of the anilox roll 310 without scanning in the X-axis direction.

  The plate cylinder 320 is supported so as to be rotatable about the X-axis direction in the figure, and has a predetermined length in the X-axis direction. As will be described later, in addition to rotating in the X-axis direction, the plate cylinder 320 is movable in the Y-axis direction orthogonal to the X-axis direction in the drawing in the surface direction of the printing surface of the substrate 31 placed on the printing stage 330. In addition, it is configured to be movable in the Z-axis direction perpendicular to the X-axis direction and the Y-axis direction, that is, in the normal direction to the printing surface of the substrate 31. On the outer peripheral surface of the plate cylinder 320, one or a plurality of plate convex portions 321 of the flexographic plate are formed. The convex part 321 of the plate is formed to have a predetermined pattern according to the light emitting layer to be printed, etc., and receives the ink 340 from the anilox roll 310 and transfers the ink 340 to the substrate 31 to be printed. . Of the plate cylinder 320, the portion of the flexographic plate including the convex portion 321 of the plate is formed of a material suitable for flexographic printing, such as resin and rubber. Note that the substrate 31 is fixed on the printing stage 330 in this embodiment.

  The printing stage 330 is a stage on which the substrate 31 that is a printing object of the printing apparatus 300 is placed on the XY plane in the drawing. The printing stage 330 includes a mechanism for fixing the substrate 31, for example, but detailed description thereof is omitted in this specification.

  FIG. 2 is a block diagram showing a more detailed configuration related to the control unit 301. The printing apparatus 300 includes a head drive unit 305, a drive unit 312, an angle detection unit 313, a drive unit 322, and an angle detection unit 323 in addition to the components illustrated in FIG.

  The head driving unit 305 drives a piezo element built in the head 303 based on an instruction from the control unit 301 to discharge the ink 340. The head driving unit 305 includes a mechanism such as a driving motor (not shown) and a rail, and scans the head 303 in the X-axis direction in the drawing.

  The drive unit 312 includes a direct drive type drive motor (not shown), and the ink 340 discharged from the head 303 reaches a predetermined position of the anilox roll 310 based on an instruction from the control unit 301. In this way, the anilox roll 310 is rotated.

  The angle detection unit 313 is an angle sensor provided on the rotation shaft of the anilox roll 310 or the drive motor. The angle detection unit 313 detects the position of the anilox roll 310 directly or indirectly, and transmits a signal indicating the position to the control unit 301.

  The drive unit 322 includes a direct drive type drive motor (not shown), and discharges to the anilox roll 310 at a predetermined position of the plate provided in the plate cylinder 320 based on an instruction from the control unit 301. The plate cylinder 320 is rotated so that the transferred ink 340 is transferred. Further, the drive unit 322 moves the plate cylinder 320 in the Y-axis direction and the Z-axis direction in the drawing, as will be described later.

  The angle detection unit 323 is an angle sensor provided on the plate cylinder 320 or the rotation shaft of the drive motor. The angle detection unit 323 detects the position of the plate cylinder 320 directly or indirectly, and transmits a signal indicating the position to the control unit 301.

  Next, the operation of the printing apparatus 300 according to the present embodiment will be described with reference to FIGS. 3 and 4. Note that the following operation of the printing apparatus 300 is performed based on an instruction from the control unit 301 unless otherwise specified. In the following description, the surface of the anilox roll 310 refers to the outer peripheral surface of the anilox roll 310 including the range of the cell 311.

  First, the control unit 301 calculates the position of the anilox roll 310 based on a signal from the angle detection unit 313 corresponding to the anilox roll 310. Subsequently, the control unit 301 calculates an ink application region on the surface of the anilox roll 310 from the print pattern stored in the storage unit 302. In the present embodiment, the ink application region is the surface of the convex portion 321 of the plate provided in the plate cylinder 320.

  Next, the head 303 discharges the ink 340 to the calculated ink application region, and forms an ink film 341 filled with the ink 340 on the surface of the anilox roll 310. At this time, the anilox roll 310 rotates in the direction of the arrow R1. Further, the head 303 discharges ink 340 while covering the length range of the anilox roll 310 by scanning in the X-axis direction in the figure.

  The ink 340 of the ink film 341 applied to the anilox roll 310 as an intermediate transfer member is transferred onto the convex portion 321 of the plate of the plate cylinder 320 by the contact between the anilox roll 310 and the plate on the plate cylinder 320. . The plate cylinder 320 rotates in the direction of the arrow C1. In the example of FIG. 3, the ink 340 of the ink film 342 on the convex portion 321 of a certain plate has already been transferred from the anilox roll 310, and then the illustrated ink film 341 is formed on the convex portion 321 of the adjacent plate. Transferred from the anilox roll 310. By such transfer from the anilox roll 310 to the plate on the plate cylinder 320, almost all the ink film 341 moves from the anilox roll 310 and is removed. In the description of the present embodiment, one or both of the anilox roll 310 and the plate cylinder 320 may rotate in the direction opposite to that illustrated.

  When the formation of the ink film 342 in the plate provided on the plate cylinder 320 is completed by the transfer of the ink, the driving unit 322 subsequently moves the plate cylinder 320 to a predetermined position on the substrate 31. Thereafter, as shown in FIG. 4, the ink 340 rotates in the direction of the arrow C <b> 1 while being in contact with the substrate 31 and transfers the ink film 342 to the substrate 31 while proceeding in the direction of the arrow C <b> 2. As a result, an ink film 343 is formed on the substrate 31. As described above, almost all of the ink film 341 is removed from the surface of the anilox roll 310 after being transferred to the plate on the plate cylinder 320.

  Next, a method for manufacturing a light emitting device manufactured using the printing apparatus 300 described above will be described. In the following description, an active drive type light emitting device using a bottom emission type organic EL element that emits light generated by the organic EL element to the outside through a substrate on which the organic EL element is formed is taken as an example. I will explain. The light-emitting device in this specification is also used as a display device.

  The light emitting device 10 shown in FIG. 5 is formed on the substrate 31 described above. When the light emitting device 10 performs color display, three pixels 30 (30R) each having a light emitting element that emits light in any one of three colors of red (R), green (G), and blue (B). , 30G, 30B) as a set, a plurality of sets, for example, m, are repeatedly arranged in the row direction (left-right direction in FIG. 5), and the same emission color in the column direction (up-down direction in FIG. 5). A plurality of, for example, n pixels each having the light emitting element are arranged. In other words, 3m pixels are arranged in the row direction, and 3m × n pixels emitting each color of RGB are arranged in a matrix.

  Hereinafter, the pixels 30 constituting the light emitting device 10 will be described. In the present embodiment, the configuration of the pixels 30R, 30G, and 30B is the same except that the light emitting layers described later are the light emitting layers 45R, 45G, and 45B, respectively. Accordingly, the pixel 30G will be described below as an example of the individual pixel.

  As shown in FIG. 6, the pixel 30G includes a pixel circuit DS. For example, as illustrated in FIG. 6, the pixel circuit DS includes a selection transistor Tr11, a drive transistor Tr12, a capacitor Cs, and an organic EL element (light emitting element) OEL.

  As shown in FIG. 6, the selection transistor Tr11 has a gate terminal connected to the scanning line Ls, a drain terminal connected to the data line Ld, and a source terminal connected to the contact N11. The drive transistor Tr12 has a gate terminal connected to the contact N11, a drain terminal connected to the anode line La, and a source terminal connected to the contact N12. The capacitor Cs is connected to the gate terminal and the source terminal of the drive transistor Tr12. Note that the capacitor Cs is an auxiliary capacitance additionally provided between the gate and the source of the driving transistor Tr12 or a capacitance component including a parasitic capacitance and an auxiliary capacitance between the gate and the source of the driving transistor Tr12. In the organic EL element OEL, the anode electrode (pixel electrode 42) is connected to the contact N12, and the reference voltage Vss is applied to the cathode electrode (counter electrode 46).

  The scanning line Ls is connected to a scanning driver (not shown) arranged on the peripheral edge of the pixel substrate, and a selection voltage for setting a plurality of pixels 30 arranged in the row direction at a predetermined timing to a selected state. A signal (scanning signal) is applied. The data line Ld is connected to a data driver (not shown) arranged at the peripheral edge of the pixel substrate, and a data voltage (grayscale signal) corresponding to light emission data at a timing synchronized with the selection state of the pixel 30. Is applied. A plurality of drive transistors Tr12 arranged in the row direction are set to a state in which a drive current corresponding to light emission data flows through the pixel electrode 42 (for example, an anode electrode) of the organic EL element OEL connected to the drive transistor Tr12. The anode line La (supply voltage line) is directly or indirectly connected to a predetermined high potential power source. In other words, the anode line La is applied with a predetermined high potential (supply voltage Vdd) sufficiently higher than the reference voltage Vss applied to the counter electrode 46 of the organic EL element OEL. The counter electrode 46 is directly or indirectly connected to, for example, a predetermined low potential power source, and is formed of a single electrode layer for all the pixels 30 arranged in an array on the substrate 31. The predetermined low voltage (reference voltage Vss, for example, ground potential GND) is set to be applied in common.

  The anode line La and the scanning line Ls are formed together with the source electrode and the drain electrode by using a source-drain conductive layer that forms the source electrode and the drain electrode of each of the transistors Tr11 and Tr12. The data line Ld is formed together with the gate electrode using a gate conductive layer that becomes a gate electrode of each of the transistors Tr11 and Tr12. As shown in FIG. 7, a contact hole 61 is formed in the insulating film 32 between the data line Ld and the drain electrode Tr11d, and the data line Ld and the drain electrode Tr11d are conducted through the contact hole 61. . Contact holes 62 and 63 are respectively formed in the insulating film 32 between the scanning line Ls and both ends of the gate electrode Tr11g, and the scanning line Ls and the gate electrode Tr11g are electrically connected through the contact holes 62 and 63. . A contact hole 64 is formed in the insulating film 32 between the source electrode Tr11s and the gate electrode Tr12g, and the source electrode Tr11s and the gate electrode Tr12g are electrically connected via the contact hole 64. The insulating film 32 is formed of an insulating material, such as a silicon oxide film or a silicon nitride film, and is formed on the substrate 31 so as to cover the data line Ld, the gate electrode Tr11g, and the gate electrode Tr12g.

  Next, as shown in FIG. 8, the organic EL element OEL includes a pixel electrode 42, a hole injection layer 43, an interlayer layer 44, a light emitting layer 45 </ b> G, and a counter electrode 46. In FIG. 8, for convenience of explanation, a configuration including a hole injection layer 43 and a light emitting layer 45G as a light emitting functional layer contributing to light emission is taken as an example. In addition, the light emitting functional layer may be only the light emitting layer 45G or may include the hole injection layer 43 and the light emitting layer 45G.

  On the substrate 31 of each pixel, a selection transistor Tr11 obtained by patterning a gate conductive layer and gate electrodes Tr11g and Tr12g of the drive transistor Tr12 are formed. On the substrate 31 adjacent to each pixel, a data line Ld extending in the column direction is formed by patterning the gate conductive layer.

  The pixel electrode (anode electrode) 42 is made of a conductive material having translucency, for example, ITO (Indium Tin Oxide), ZnO, or the like. Each pixel electrode 42 is insulated from the pixel electrode 42 of another adjacent pixel 30 by an interlayer insulating film 47.

  The interlayer insulating film 47 is made of an insulating material such as a silicon nitride film. The interlayer insulating film 47 is formed between the pixel electrodes 42 and insulates and protects the transistors Tr11 and Tr12, the scanning line Ls, and the anode line La. A substantially rectangular opening 47a is formed in the interlayer insulating film 47, and the light emitting region of the pixel 30G is defined by the opening 47a. Further, a partition wall 48 is formed on the interlayer insulating film 47. The partition wall 48 is formed with a groove-shaped opening 48 a extending in the column direction (vertical direction in FIG. 7) over the plurality of pixels 30. Here, the interlayer insulating film 47 and the partition wall 48 formed thereon form a gap region between the light emitting regions of the pixels 30 arranged adjacent to each other in the row direction.

  The partition wall 48 is formed by curing an insulating material, for example, a photosensitive resin such as polyimide, and is formed on the interlayer insulating film 47. As shown in FIG. 7, the partition wall 48 is formed in a stripe shape so as to open the pixel electrodes 42 of a plurality of pixels along the column direction. The planar shape of the partition wall 48 is not limited to this, and may be a lattice shape having an opening for each pixel electrode 42. The upper surface of the partition wall 48 is formed to be higher than the upper surface of the flat portion at the center of the light emitting layers 45R, 45G, and 45B.

  Note that the surface of the partition wall 48 and the surface of the interlayer insulating film 47 may be subjected to a liquid repellent treatment. Here, the liquid repellency indicates the property of repelling both aqueous solvents and organic solvents.

  The hole injection layer 43 is formed on the pixel electrode 42. The hole injection layer 43 has a function of supplying holes to the light emitting layer 45. The hole injection layer 43 is made of an organic polymer material capable of hole injection / transport, such as PEDOT: PSS (a mixture of polyethylenedioxythiophene as a conductive polymer and polystyrenesulfonic acid as a dopant). Composed.

  The interlayer layer 44 is formed on the hole injection layer 43. The interlayer layer 44 has a function of blocking electrons to facilitate recombination of electrons and holes in the light emitting layer 45G, and increases the light emission efficiency of the light emitting layer 45G.

  The light emitting layer 45G is formed on the hole injection layer 43. The light emitting layer 45G (and R, B) has a function of generating light of the emission color of each pixel by applying a voltage between the anode electrode 42 and the cathode electrode 46. The light emitting layer 45G is made of a known polymer light emitting material capable of emitting fluorescence or phosphorescence, for example, a light emitting material containing a conjugated double bond polymer such as polyparaphenylene vinylene or polyfluorene. These luminescent materials are formed by applying a solution (dispersion) dissolved (or dispersed) in an aqueous solvent or an organic solvent such as tetralin, tetramethylbenzene, mesitylene, and xylene as appropriate, and volatilizing the solvent.

  In the case of the bottom emission type, the counter electrode (cathode electrode) 46 is provided on the light emitting layer 45G side, and an electron-injecting lower layer made of a conductive material, for example, a material having a low work function such as Li, Mg, Ca, Ba, It is a laminated structure having an upper layer made of a light-reflective conductive metal such as Al. In the present embodiment, the counter electrode 46 is composed of a single electrode layer formed across a plurality of pixels 30, and for example, a reference voltage Vss which is a ground potential is applied. When the organic EL element OEL is a top emission type, the counter electrode 46 is provided on the light emitting layer 45G side and is an extremely thin material having a film thickness of about 10 nm, such as Li, Mg, Ca, Ba, or the like, which has a low work function. And a transparent laminated structure having a light transmissive conductive layer such as ITO having a thickness of about 100 nm to 200 nm.

  A passivation film 49 is provided on the counter electrode 46. An adhesive layer 50 is provided on the passivation film 49. A sealing substrate 51 is provided on the adhesive layer 50.

  Next, a method for manufacturing the light emitting device according to the present embodiment will be described with reference to FIGS. 9 (a) to 9 (c) and FIGS. 10 (a) to 10 (c). Since the selection transistor Tr11 is formed in the same process as the driving transistor Tr12, a part of the description of the formation of the selection transistor Tr11 is omitted.

  As shown in FIG. 9A, first, a substrate 31 made of a glass substrate or the like is prepared. Next, on the substrate 31, for example, a Mo film, a Cr film, an Al film, a Cr / Al laminated film, an AlTi alloy film or an AlNdTi alloy film, an AlNi alloy film, a MoNb alloy film, etc. A gate conductive film is formed and patterned into the shape of the gate electrode Tr12g of the drive transistor Tr12 as shown in FIG. At this time, although not shown, the gate electrode Tr11g of the selection transistor Tr11 and the data line Ld are also formed. Subsequently, as shown in FIG. 9B, an insulating film 32 is formed on the gate electrode Tr12g and the data line Ld by a CVD (Chemical Vapor Deposition) method or the like.

  Next, a semiconductor layer made of amorphous silicon or the like is formed on the insulating film 32 by a CVD method or the like. Next, an insulating film made of, for example, SiN is formed on the semiconductor layer by a CVD method or the like. Subsequently, the insulating film is patterned by photolithography or the like to form the stopper film 115. Further, a film made of amorphous silicon or the like containing n-type impurities is formed on the semiconductor layer and the stopper film 115 by a CVD method or the like, and this film and the semiconductor layer are patterned by photolithography or the like. As shown in FIG. 9B, the semiconductor layer 114 and the ohmic contact layers 116 and 117 are formed.

  Next, a transparent conductive film such as ITO or a light-reflective conductive film and a transparent conductive film such as ITO are coated on the insulating film 32 by sputtering, vacuum deposition, or the like, and then patterned by photolithography to be pixel electrodes 42. Form.

  Subsequently, after forming contact holes 61 to 64 as through holes in the insulating film 32, for example, a Mo film, a Cr film, an Al film, a Cr / Al laminated film, an AlTi alloy film, an AlNdTi alloy film, or an AlNi alloy film. Then, a source-drain conductive film made of a MoNb alloy film or the like is coated by a sputtering method, a vacuum deposition method, or the like, and patterned by photolithography to form a drain electrode Tr12d and a source electrode Tr12s as shown in FIG. 9B. . At the same time, the anode line La is formed. At this time, the source electrode Tr12s of the drive transistor Tr12 is formed so as to overlap with a part of the pixel electrode 42, respectively.

  Subsequently, as shown in FIG. 9C, an interlayer insulating film 47 made of a silicon nitride film is formed by a CVD method or the like so as to cover the driving transistor Tr12 and the like, and then an opening 47a is formed by photolithography. Next, a photosensitive polyimide is applied so as to cover the interlayer insulating film 47, and is patterned by exposure and development through a mask corresponding to the shape of the partition wall 48. As shown in FIG. A partition wall 48 having 48a is formed.

  Next, as shown in FIG. 10A, a light emitting layer 45G is formed. Here, a PEDOT: PSS solution to be used as a hole injection layer is selectively printed as ink 340 on the pixel electrode 42 surrounded by the opening 47a by the printing apparatus 300 described above. Ink 340 is prepared as PEDOT: PSS ink by adding alcohol, nonionic surfactant, ethylene glycol or the like for adjusting viscosity and surface tension to PEDOT: PSS. Subsequently, the substrate 31 is dried at 150 ° C. to 250 ° C. for 5 to 30 minutes in an air atmosphere. Thereby, the hole injection layer 43 is formed by volatilizing the solvent of the organic compound-containing liquid. The organic compound-containing liquid may be applied in a heated atmosphere. Note that the pattern of the convex portions 321 of the plate on the plate cylinder 320 which is a flexographic plate is formed in advance in a predetermined pattern using a photolithography method in accordance with the pattern of each layer to be printed. In the printing apparatus 300 for the hole injection layer, the thickness of the convex portion 321 of the plate on the plate cylinder 320 is sufficiently higher than the sum of the thickness of the interlayer insulating film 47 and the thickness of the partition wall 48. The plate on 320 can easily protrude the ink 340 of the ink film 342 onto the pixel electrode 42.

  Next, as shown in FIG. 10B, an interlayer layer 44 is formed. Here, an organic compound-containing liquid containing a material for forming the interlayer layer 44 is printed as ink 340 on the hole injection layer 43 surrounded by the opening 47 a by the printing apparatus 300. Subsequently, heat drying in an inert atmosphere such as nitrogen or argon, or heat drying in a vacuum is performed, and the residual solvent is removed to form the interlayer layer 44. The organic compound-containing liquid may be applied in a heated atmosphere. The hole injection layer 43 and the interlayer layer 44 can be formed of a common material even when the light emitting layer 45 of a plurality of colors is provided as in the present embodiment. In the printing apparatus 300 for the interlayer layer, the thickness of the convex portion 321 of the plate on the plate cylinder 320 is sufficiently higher than the sum of the thickness of the interlayer insulating film 47 and the thickness of the partition wall 48. The upper plate can easily protrude the ink 340 of the ink film 342 on the hole injection layer 43.

  Next, the light emitting layer 45G is formed. Here, the organic compound-containing liquid containing the light emitting polymer material (R, G, B) is printed as the ink 340 on the interlayer layer 44 surrounded by the opening 47a by the printing apparatus 300. The ink 340 is adjusted to a predetermined concentration by dissolving a polyfluorene-based polymer light-emitting material in a solvent such as toluene, xylene, methicylene, or tetramethylbenzene. The solvent may be the above mixed solvent. Subsequently, the film is heated at 80 to 150 ° C. in a dry atmosphere or a vacuum with a dew point of −70 ° C. or lower, but below the glass transition temperature of the light emitting layer for 10 to 30 minutes to remove the solvent in the film. In the printing device 300 for the light emitting layer, the thickness of the convex portion 321 of the plate on the plate cylinder 320 is sufficiently higher than the sum of the thickness of the interlayer insulating film 47 and the thickness of the partition wall 48. In this plate, the ink 340 of the ink film 342 can easily protrude on the interlayer layer 44.

  Next, as shown in FIG. 10C, the counter electrode 46 is formed. Here, after cooling in a dry atmosphere, the substrate 31 formed up to the light emitting layer 45G is vacuum-deposited or electron-beam-deposited, such as Li, Mg, LiF, Ca, Ba, alkali metal, alkaline earth metal, or Those compounds are formed by vapor deposition. Subsequently, a light-reflective conductive layer such as Al is formed by vapor deposition or electron beam vapor deposition. Thereby, the counter electrode 46 having a two-layer structure is formed.

  Next, as shown in FIG. 8, a passivation film 49 is formed on the counter electrode 46 by depositing SiN, SiON or the like by electron beam evaporation, sputtering, or CVD. Subsequently, an adhesive layer 50 made of an ultraviolet curable resin or a thermosetting resin is applied on the passivation film 49, and a sealing substrate 51 formed of glass or a metal cap is bonded to the application surface. Subsequently, the adhesive layer 50 is cured by ultraviolet rays or heat, and the substrate 31 and the sealing substrate 51 are bonded. Thus, the light emitting device 10 is manufactured.

  The light emitting device 10 having such a configuration is used as a display unit (display) of an electronic device such as a digital camera, a personal computer, or a mobile phone. Specifically, the camera 200 includes a lens unit 201, an operation unit 202, a display unit 203, and a viewfinder 204, as shown in FIGS. 11A and 11B, for example. The light emitting device 10 is used as the display unit 203. Similarly, the personal computer 210 illustrated in FIG. 12 includes a display unit 211 and an operation unit 212, and the light emitting device 10 is used as the display unit 211. 13 includes a display unit 221, an operation unit 222, a reception unit 223, and a transmission unit 224, and the light emitting device 10 is used as the display unit 221. Further, the large-screen television 230 illustrated in FIG. 14 includes a display unit 231, and the light-emitting device 10 is used for the display unit 231.

  As described above, in the present embodiment, in flexographic printing, ink is formed on the surface of the anilox roll 310 by an ink jet method only in a portion corresponding to the display portion (pixel 30) on the substrate 31. Thereby, the usage-amount of the ink used for flexographic printing can be reduced. That is, it is possible to improve the use efficiency of the expensive organic EL material and reduce the manufacturing cost of the light emitting device.

  In addition, this invention is not limited to embodiment mentioned above and a specific example, A various deformation | transformation and application are possible.

  For example, in the above-described embodiment, the light emitting device 10 performs color display and has been described by taking a configuration including light emitting elements of three colors as an example. However, the present invention is not limited to this, and there are two colors or four colors or more. May be. Moreover, when the light-emitting device 10 performs a monochromatic display, it has only one color light-emitting element.

  In the above-described embodiment, the light emitting functional layer has a configuration including the hole injection layer 43, the interlayer layer 44, and the light emitting layer 45 (R, G, B), but is not limited thereto. For example, the light emitting functional layer may be configured by the hole injection layer 43 and the light emitting layer 45, or only the light emitting layer 45 may be used as the light emitting functional layer.

  In the above-described embodiment, the pixel circuit DS has a configuration including two transistors as an example. However, the pixel circuit DS may include three or more transistors.

  In the above-described embodiment, the description is centered on the bottom emission type organic EL element. However, the present invention is not limited to this, and the top emission type organic EL element that emits light generated by the organic EL element OEL to the outside through the counter electrode is used. It can also be used for EL elements.

  In the above-described embodiment, the configuration in which the light emitting device is used as a display device has been described as an example. However, it can also be used as an exposure device such as a printer head that irradiates light to a photosensitive drum of a printer. .

  Further, in the above-described embodiment, the head 303 is described as a so-called serial head system in which scanning is performed in the X-axis direction in the figure. In the serial head system, for example, the head 303 scans along the guide rail 307 shown in FIG. In addition to this, for example, a so-called line head type head having a plurality of discharge ports (nozzles) may be used. In this case, the number of heads may be one, but as shown in FIG. 15B, for example, the three heads 308a, 308b, and 308c may be arranged in a staggered manner when viewed from the Z-axis direction. Accordingly, the configuration for scanning the head 303 in the head driving unit 305 can be omitted or simplified. In addition, it is preferable to employ a line head system because the process can be shortened because printing is performed at once in a wide range. In this case, based on the variation in the discharge amount of each nozzle, the operation waveform for the piezo element of each nozzle is preset and stored in the storage unit 302, so that the discharge amount from each nozzle is constant. Is desirable.

  In the embodiment described above, the rotary anilox roll 310 is described as the intermediate transfer member. However, a plate-shaped anilox plate may be used.

  DESCRIPTION OF SYMBOLS 10 ... Light-emitting device, 30, 30R, 30G, 30B ... Pixel, 31 ... Substrate, 32 ... Insulating film, 42 ... Pixel electrode (anode electrode), 43 ... Hole injection Layer, 44 ... interlayer layer, 45R, 45G, 45B ... light emitting layer, 46 ... counter electrode (cathode electrode), 47 ... interlayer insulating film, 48 ... partition wall, 49 ... Passivation film, 50 ... adhesive layer, 51 ... sealing substrate, 114 ... semiconductor layer, 115 ... stopper film, 116,117 ... ohmic contact layer, 300 ... printing apparatus, 301 ... control 302, storage unit, 303, 308a to c ... head, 304 ... ink storage unit, 305 ... head drive unit, 307 ... guide rail, 310 ... anilox roll, 311 ... cell, 312, 322 ... drive unit, 313 323... Angle detection unit, 320... Plate cylinder, 321... Plate convex part, 330... Printing stage, 340 .. Ink, 341 to 343 .. Ink film, Tr11d, Tr12d. Electrode, Tr11s, Tr12s ... Source electrode, La ... Anode line, Ls ... Scan line, Ld ... Data line, Tr11 ... Selection transistor, Tr12 ... Drive transistor

Claims (9)

A light-emitting device manufacturing apparatus comprising a plurality of light-emitting elements arranged on a substrate,
A rotary plate cylinder provided with a flexographic plate for printing an ink for forming an organic layer of the light emitting element on the substrate;
An intermediate transfer member that contacts the flexographic plate and transfers the ink;
A head portion for supplying the ink to the intermediate transfer member;
A storage unit for storing an ink supply pattern on the surface of the intermediate transfer member corresponding to the printed pattern of the substrate;
A control unit that supplies the ink from the head unit in the region of the ink supply pattern of the intermediate transfer member,
An apparatus for manufacturing a light-emitting device. A head driving unit that moves the head unit to a position facing the ink supply pattern;
The apparatus for manufacturing a light emitting device according to claim 1. The head portion discharges the ink to the intermediate transfer member by an ink jet method.
The light-emitting device manufacturing apparatus according to claim 1 or 2. The head unit includes a plurality of nozzles fixed at positions where the ink is ejected,
Each of the plurality of nozzles includes a piezo element that discharges the ink as a droplet by an inkjet method,
The storage unit stores operation waveforms of the piezo elements,
The control unit controls the ejection amount of the ink from each of the piezoelectric elements to be uniform based on the operation waveform;
The light emitting device manufacturing apparatus according to claim 1, wherein the light emitting device manufacturing apparatus is a light emitting device. The light emitting element is an organic electroluminescence element,
The ink includes a material that becomes an organic layer of an organic electroluminescence element.
The light emitting device manufacturing apparatus according to claim 1, wherein the light emitting device manufacturing apparatus is a light emitting device. The intermediate transfer member is a rotating anilox roll,
The light emitting device manufacturing apparatus according to claim 1, wherein the light emitting device manufacturing apparatus is a light emitting device. The intermediate transfer member is a plate-shaped anilox plate,
The light emitting device manufacturing apparatus according to claim 1, wherein the light emitting device manufacturing apparatus is a light emitting device. One or a plurality of organic layers are formed on the substrate using the light emitting device manufacturing apparatus according to any one of claims 1 to 7.
A method for manufacturing a light-emitting device. A step of selectively supplying ink containing an organic layer material of a light emitting element to a region of the surface of the intermediate transfer member that is in contact with the flexographic plate of the plate cylinder by an inkjet method;
Transferring the ink from the intermediate transfer member to the flexographic plate of the plate cylinder;
Printing the ink on the substrate from the plate cylinder,
A method for manufacturing a light-emitting device.

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