JP2019145329A - Organic electroluminescent panel and organic electroluminescent device - Google Patents

Abstract

To provide an organic electroluminescent panel and an organic electroluminescent device, capable of making an ink layer more uniform.SOLUTION: The organic electroluminescent element includes: an organic layer composed of a coating film; and a partition wall provided around the organic layer. On a side surface of each partition wall, a receding contact angle with respect to an ink liquid containing a raw material for the coating film is greater than 20 degrees.SELECTED DRAWING: Figure 10

Description

  The present disclosure relates to an organic electroluminescent panel and an organic electroluminescent device.

  There is known a method of manufacturing an organic electroluminescent panel by forming an organic electroluminescent element for each pixel using a device for applying ink. When an organic electroluminescent panel is manufactured by this method, a bank for partitioning each pixel is provided on the panel on which ink is dropped (see, for example, Patent Documents 1 and 2).

JP-A-2006-91841 JP 2013-214359 A

  By the way, when the ink is applied to the panel, a part of the ink may spread on the side surface of the bank and a meniscus may be formed on the surface of the ink. In that case, in the ink layer, the vicinity of the bank becomes extremely thick, so that the uniformity of light emission is impaired, the light emission efficiency is lowered, and the life is shortened. Accordingly, it is desirable to provide an organic electroluminescent panel and an organic electroluminescent device that can make the ink layer more uniform.

  The organic electroluminescent element of one embodiment of this indication is provided with the organic layer comprised by the coating film, and the partition part provided in the circumference | surroundings of the organic layer. On the side surface of each partition wall, the receding contact angle measured by the contraction method of the expansion / contraction method with respect to the ink liquid containing the raw material of the coating film is larger than 20 degrees.

  An organic electroluminescent device according to an embodiment of the present disclosure includes an organic electroluminescent panel having a plurality of pixels. At least one of the plurality of pixels includes an organic layer formed of a coating film and a partition wall provided around the organic layer. On the side surface of each partition wall, the receding contact angle measured by the contraction method of the expansion / contraction method with respect to the ink liquid containing the raw material of the coating film is larger than 20 degrees.

  According to the organic electroluminescent element and the organic electroluminescent device of an embodiment of the present disclosure, the receding contact angle with respect to the ink liquid containing the raw material of the coating film is set to 20 degrees on the side surface of the partition wall provided around the organic layer. The thickness of the organic layer can be made more uniform. In addition, the effect of this indication is not necessarily limited to the effect described here, Any effect described in this specification may be sufficient.

It is a figure showing the schematic structural example of the organic electroluminescent apparatus which concerns on one embodiment of this indication. FIG. 2 is a diagram illustrating a circuit configuration example of subpixels included in each pixel of FIG. 1. It is a figure showing the schematic structural example of the organic electroluminescent panel of FIG. It is a figure showing the cross-sectional structural example in the AA line of the organic electroluminescent panel of FIG. It is a figure showing the cross-sectional structural example in the BB line of the organic electroluminescent panel of FIG. It is a figure which expands and represents the cross-sectional structural example of the organic electroluminescent panel of FIG. It is a figure for demonstrating a static contact angle. It is a figure for demonstrating a backward contact angle. It is a figure for demonstrating the measuring method of receding contact angle by the expansion / contraction method. It is a figure showing an example of the measurement result of the receding contact angle concerning an example. It is a figure showing an example of the measurement result of receding contact angle concerning a comparative example. It is a figure showing the modification of schematic structure of the organic electroluminescent panel of FIG. It is a figure showing the cross-sectional structural example in the AA line of the organic electroluminescent panel of FIG. It is a figure showing the cross-sectional structural example in the BB line of the organic electroluminescent panel of FIG.

  Hereinafter, modes for carrying out the present disclosure will be described in detail with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, component arrangement positions, connection forms, and the like shown in the following embodiments are merely examples and do not limit the present disclosure. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present disclosure are described as arbitrary constituent elements. Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

<1. Embodiment>
FIG. 1 illustrates a schematic configuration example of an organic electroluminescent device 1 according to an embodiment of the present disclosure. FIG. 2 illustrates an example of a circuit configuration of the sub-pixel 12 included in each pixel 11 provided in the organic electroluminescence device 1. The organic electroluminescent device 1 includes, for example, an organic electroluminescent panel 10, a controller 20, and a driver 30. The driver 30 is mounted on the outer edge portion of the organic electroluminescent panel 10, for example. The organic electroluminescent panel 10 has a plurality of pixels 11 arranged in a matrix. The controller 20 and the driver 30 drive the organic electroluminescent panel 10 (the plurality of pixels 11) based on the video signal Din and the synchronization signal Tin input from the outside.

(Organic electroluminescent panel 10)
The organic electroluminescence panel 10 displays an image based on the video signal Din and the synchronization signal Tin inputted from the outside, by the active matrix driving of each pixel 11 by the controller 20 and the driver 30. The organic electroluminescence panel 10 includes a plurality of scanning lines WSL extending in the row direction, a plurality of signal lines DTL and a plurality of power supply lines DSL extending in the column direction, and a plurality of pixels 11 arranged in a matrix. have.

  The scanning line WSL is used for selecting each pixel 11, and supplies a selection pulse for selecting each pixel 11 for each predetermined unit (for example, a pixel row) to each pixel 11. The signal line DTL is used to supply a signal voltage Vsig corresponding to the video signal Din to each pixel 11 and supplies a data pulse including the signal voltage Vsig to each pixel 11. The power supply line DSL supplies power to each pixel 11.

  Each pixel 11 includes, for example, a sub-pixel 12 that emits red light, a sub-pixel 12 that emits green light, and a sub-pixel 12 that emits blue light. Note that each pixel 11 may further include, for example, a sub-pixel 12 that emits another color (for example, white or yellow). In each pixel 11, the plurality of subpixels 12 are arranged in a line in a predetermined direction, for example. The sub-pixel 12 corresponds to a specific example of “pixel” of the present disclosure.

  Each signal line DTL is connected to an output terminal of a horizontal selector 31 described later. For example, one signal line DTL is assigned to each pixel column. Each scanning line WSL is connected to an output end of a write scanner 32 described later. For example, one scanning line WSL is assigned to each pixel row. Each power line DSL is connected to the output terminal of the power source. For example, one power line DSL is allocated to each pixel row.

  Each sub-pixel 12 includes a pixel circuit 12-1 and an organic electroluminescent element 12-2. The configuration of the organic electroluminescent element 12-2 will be described in detail later. The pixel circuit 12-1 controls light emission / extinction of the organic electroluminescent element 12-2. The pixel circuit 12-1 has a function of holding a voltage written in each sub-pixel 12 by writing scanning described later. The pixel circuit 12-1 includes, for example, a drive transistor Tr1, a write transistor Tr2, and a storage capacitor Cs.

  The write transistor Tr2 controls application of the signal voltage Vsig corresponding to the video signal Din to the gate of the drive transistor Tr1. Specifically, the write transistor Tr2 samples the voltage of the signal line DTL and writes the voltage obtained by the sampling to the gate of the drive transistor Tr1. The drive transistor Tr1 is connected in series with the organic electroluminescent element 12-2. The drive transistor Tr1 drives the organic electroluminescent element 12-2. The drive transistor Tr1 controls the current flowing through the organic electroluminescent element 12-2 according to the magnitude of the voltage sampled by the write transistor Tr2. The holding capacitor Cs holds a predetermined voltage between the gate and source of the driving transistor Tr1. The storage capacitor Cs has a role of holding the gate-source voltage Vgs of the drive transistor Tr1 constant during a predetermined period. The pixel circuit 12-1 may have a circuit configuration in which various capacitors and transistors are added to the above-described 2Tr1C circuit, or may have a circuit configuration different from the above-described 2Tr1C circuit configuration. Good.

  Each signal line DTL is connected to an output terminal of a horizontal selector 31 (to be described later) and a source or drain of the write transistor Tr2. Each scanning line WSL is connected to an output terminal of a later-described write scanner 32 and a gate of the write transistor Tr2. Each power line DSL is connected to the power circuit and the source or drain of the drive transistor Tr1.

  The gate of the writing transistor Tr2 is connected to the scanning line WSL. The source or drain of the write transistor Tr2 is connected to the signal line DTL. Of the source and drain of the write transistor Tr2, a terminal not connected to the signal line DTL is connected to the gate of the drive transistor Tr1. The source or drain of the drive transistor Tr1 is connected to the power supply line DSL. Of the source and drain of the driving transistor Tr1, a terminal not connected to the power supply line DSL is connected to the anode 21 of the organic electroluminescent element 21-2. One end of the storage capacitor Cs is connected to the gate of the drive transistor Tr1. The other end of the storage capacitor Cs is connected to a terminal on the organic electroluminescence element 21-2 side of the source and drain of the drive transistor Tr1.

(Driver 30)
The driver 30 includes, for example, a horizontal selector 31 and a write scanner 32. For example, the horizontal selector 31 applies the analog signal voltage Vsig input from the controller 20 to each signal line DTL in response to (in synchronization with) the input of the control signal. The write scanner 32 scans the plurality of subpixels 12 for each predetermined unit.

(Controller 20)
Next, the controller 20 will be described. For example, the controller 20 performs a predetermined correction on the digital video signal Din input from the outside, and generates a signal voltage Vsig based on the video signal obtained thereby. For example, the controller 20 outputs the generated signal voltage Vsig to the horizontal selector 31. For example, the controller 20 outputs a control signal to each circuit in the driver 30 in response to (in synchronization with) a synchronization signal Tin input from the outside.

  Next, the organic electroluminescent element 12-2 will be described with reference to FIG. 3, FIG. 4, FIG. 5, and FIG. FIG. 3 shows a schematic configuration example of the organic electroluminescent panel 10. FIG. 4 illustrates an example of a cross-sectional configuration taken along line AA of the organic electroluminescent panel 10 of FIG. FIG. 5 illustrates a cross-sectional configuration example taken along line BB of the organic electroluminescent panel 10 of FIG. FIG. 6 shows an enlarged cross-sectional configuration example of the organic electroluminescent element 12-2 in FIG.

  The organic electroluminescent panel 10 has a plurality of pixels 11 arranged in a matrix. For example, as described above, each pixel 11 includes a sub-pixel 12 (12R) that emits red light, a sub-pixel 12 (12G) that emits green light, and a sub-pixel 12 (12B) that emits blue light. ing. The sub-pixel 12R includes an organic electroluminescent element 12-2 (12r) that emits red light. The subpixel 12G includes an organic electroluminescent element 12-2 (12g) that emits green light. The subpixel 12B includes an organic electroluminescent element 12-2 (12b) that emits blue light. The subpixels 12R, 12G, and 12B have, for example, a stripe arrangement. In each pixel 11, for example, sub-pixels 12R, 12G, and 12B are arranged side by side in the column direction. Furthermore, in each pixel row, for example, a plurality of subpixels 12 that emit light of the same color are arranged side by side in the row direction.

  The organic electroluminescence panel 10 has a lattice-like pixel bank 18 extending on a substrate 14 in a row direction and a column direction. The pixel bank 18 corresponds to a specific example of “a partition wall” of the present disclosure. The pixel bank 18 is provided around each pixel 11. The pixel bank 18 partitions each pixel 11 and each subpixel 12 in each pixel 11. The board | substrate 14 is comprised by the base material which supports each organic electroluminescent element 12-2, the pixel bank 18, etc., and the wiring layer provided on the base material, for example. The base material in the board | substrate 14 is comprised by the glass substrate or the flexible substrate, for example. Examples of the material of the glass substrate used as the base material in the substrate 14 include alkali-free glass, soda glass, non-fluorescent glass, phosphate glass, borate glass, and quartz. Examples of the material of the flexible substrate used as the base material in the substrate 14 include acrylic resin, styrene resin, polycarbonate resin, epoxy resin, polyethylene, polyester, or silicone resin. For example, a pixel circuit 12-1 of each pixel 11 is formed in the wiring layer in the substrate 14.

  A region surrounded by the pixel bank 18 is a sub-pixel 12. In each subpixel 12, each organic electroluminescent element 12-2 is arranged one by one. That is, in each sub-pixel 12, each organic electroluminescent element 12-2 is disposed one by one in a region surrounded by the pixel bank 18. Accordingly, the pixel bank 18 surrounds the organic electroluminescent element 12-2 (that is, a light emitting layer 24 described later) from the periphery.

  Each organic electroluminescent element 12-2 includes, for example, an anode 21, a hole injection layer 22, a hole transport layer 23, a light emitting layer 24, an electron transport layer 25, an electron injection layer 26, and a cathode 27 in this order from the substrate 14 side. Have. The light emitting layer 24 corresponds to a specific example of “organic layer” of the present disclosure.

  Each organic electroluminescent element 11-2 includes, for example, a light emitting layer 24 and an anode 21 and a cathode 27 arranged so as to sandwich the light emitting layer 24 therebetween. The organic electroluminescent element 12-2 further includes, for example, a hole injection layer 22 and a hole transport layer 23 in this order from the anode 21 side between the anode 21 and the light emitting layer 24. Note that at least one of the hole injection layer 22 and the hole transport layer 23 may be omitted. The organic electroluminescent element 11-2 further includes, for example, an electron transport layer 25 and an electron injection layer 26 in this order from the light emitting layer 24 side between the light emitting layer 24 and the cathode 27. Note that at least one of the electron transport layer 25 and the electron injection layer 26 may be omitted. The organic electroluminescent element 11-2 includes, for example, an anode 21, a hole injection layer 22, a hole transport layer 23, a light emitting layer 24, an electron transport layer 25, an electron injection layer 26, and a cathode 27 in this order from the substrate 21 side. It is the element structure comprised by these. The organic electroluminescent element 11-2 may further include another functional layer.

  The hole injection layer 22 is a layer for increasing the hole injection efficiency. The hole transport layer 23 is a layer for transporting holes injected from the anode 21 to the light emitting layer 24. The light emitting layer 24 is a layer that emits EL light of a predetermined color by recombination of electrons and holes. The electron transport layer 25 is a layer for transporting electrons injected from the cathode 27 to the light emitting layer 24. The electron injection layer 26 is a layer for increasing electron injection efficiency.

  The anode 21 is formed on the substrate 14, for example. Further, the anode 21 is formed, for example, so that the edge of the anode 21 is embedded in the pixel bank 18. Accordingly, at least a part of the edge of the anode 21 is located immediately below the pixel bank 18. The anode 21 is, for example, a reflective electrode having reflectivity, and is, for example, a reflective conductive film made of a conductive material such as aluminum (Al), silver (Ag), or an alloy of aluminum or silver. That is, in this case, the reflecting surface of the anode 21 is an anode reflecting surface. For example, the anode 21 may be one in which a reflective electrode is laminated on a transparent electrode. The anode 21 may be a reflective electrode having translucency. In this case, the anode 21 is made of, for example, a transparent conductive film made of a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide), and an Al thin film formed on the surface of the transparent conductive film. It may be configured. At this time, the reflective surface of the anode 21 is an anode semi-transmissive surface.

  When the anode 21 is a reflective electrode having reflectivity, the cathode 27 is a reflective electrode having translucency. At this time, the cathode 27 may be comprised by the transparent conductive film which consists of transparent conductive materials, such as ITO or IZO, and the Al thin film formed on the surface of the transparent conductive film, for example. At this time, the reflecting surface of the cathode 27 is a cathode semi-transmissive surface. When the anode 21 is a reflective electrode having translucency, the cathode 27 is a reflective electrode having reflectivity. At this time, the cathode 27 is made of, for example, aluminum (Al), magnesium (Mg), silver (Ag), an aluminum-lithium alloy, a magnesium-silver alloy, or the like. At this time, the reflecting surface of the cathode 27 is a cathode reflecting surface. When the substrate 14 and the anode 21 are translucent and the cathode 27 is reflective, the organic electroluminescent element 12-2 has a bottom emission structure that emits light from the substrate 14 side. When the anode 21 has reflectivity and the cathode 27 has translucency, the organic electroluminescent element 12-2 has a top emission structure that emits light from the cathode 27 side.

  The hole injection layer 22 has a function of promoting injection of holes from the anode 21 to the light emitting layer 24. The hole injection layer 22 may be, for example, an oxide such as silver (Ag), molybdenum (Mo), chromium (Cr), vanadium (V), tungsten (W), nickel (Ni), iridium (Ir), or The conductive polymer material such as PEDOT (a mixture of polythiophene and polystyrene sulfonic acid) is used.

  The hole transport layer 23 has a function of transporting holes injected from the anode 21 to the light emitting layer 24. The hole transport layer 23 is, for example, a coating film. The hole transport layer 23 is formed, for example, by applying and drying a solution containing an organic material having a hole transport property (hereinafter referred to as “hole transport material 23M”) as a main component of a solute. Yes. The hole transport layer 23 includes a hole transport material 23M as a main component.

  The hole transporting material 23M that is a raw material (material) of the hole transporting layer 23 includes, for example, arylamine derivatives, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine Derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, butadiene compounds, polystyrene derivatives, hydrazone derivatives, triphenylmethane derivatives, tetraphenylbenzine derivatives, etc., or a combination thereof Material. The hole transporting material 23M further includes, for example, a soluble group and an insolubilizing group such as a thermally dissociable soluble group, a crosslinkable group, or a removable protective group in the molecular structure for the function of solubility and insolubilization. And have.

  The light emitting layer 24 has a function of emitting light of a predetermined color by recombination of holes and electrons. The light emitting layer 24 is a coating film. The light emitting layer 24 is formed by applying and drying a solution containing an organic material that emits light by generating excitons by recombination of holes and electrons (hereinafter referred to as “organic light emitting material 24M”) as a main component of a solute. Has been. The light emitting layer 24 includes an organic light emitting material 24M as a main component. In the organic electroluminescent element 12r included in the sub-pixel 12R, the organic light emitting material 24M includes a red organic light emitting material. In the organic electroluminescent element 12g included in the sub-pixel 12G, the organic light emitting material 24M includes a green organic light emitting material. In the organic electroluminescent element 12b included in the sub-pixel 12B, the organic light emitting material 24M includes a blue organic light emitting material.

  The light emitting layer 24 is configured by, for example, a single organic light emitting layer or a plurality of stacked organic light emitting layers. In the case where the light emitting layer 24 is configured by a plurality of organic light emitting layers stacked, the light emitting layer 24 is formed by stacking a plurality of organic light emitting layers whose main components are common to each other, for example. At this time, the plurality of organic light emitting layers are all coating films. Both of the plurality of organic light emitting layers are formed by applying and drying a solution containing the organic light emitting material 24M as a main component of a solute.

  The organic light emitting material 24M that is a raw material (material) of the light emitting layer 24 may be, for example, a dopant material alone, but more preferably a combination of a host material and a dopant material. That is, the light emitting layer 24 includes the host material and the dopant material as the organic light emitting material 24M. The host material mainly has the function of transporting electrons or holes, and the dopant material has the function of light emission. The host material and the dopant material are not limited to one type, and may be a combination of two or more types. The amount of the dopant material is preferably 0.01% by weight to 30% by weight and more preferably 0.01% by weight to 10% by weight with respect to the host material.

  As the host material of the light emitting layer 24, for example, an amine compound, a condensed polycyclic aromatic compound, or a heterocyclic compound is used. As the amine compound, for example, a monoamine derivative, a diamine derivative, a triamine derivative, or a tetraamine derivative is used. Examples of the condensed polycyclic aromatic compound include anthracene derivatives, naphthalene derivatives, naphthacene derivatives, phenanthrene derivatives, chrysene derivatives, fluoranthene derivatives, triphenylene derivatives, pentacene derivatives, and perylene derivatives. Examples of heterocyclic compounds include carbazole derivatives, furan derivatives, pyridine derivatives, pyrimidine derivatives, triazine derivatives, imidazole derivatives, pyrazole derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, pyrrole derivatives, indole derivatives, azaindole derivatives, Azacarbazole, a pyrazoline derivative, a pyrazolone derivative, a phthalocyanine derivative, or the like can be given.

  Moreover, as a dopant material of the light emitting layer 24, a pyrene derivative, a fluoranthene derivative, an aryl acetylene derivative, a fluorene derivative, a perylene derivative, an oxadiazole derivative, an anthracene derivative, or a chrysene derivative is used, for example. Further, a metal complex may be used as the dopant material of the light emitting layer 24. Examples of the metal complex include a metal atom and a ligand such as iridium (Ir), platinum (Pt), osmium (Os), gold (Au), rhenium (Re), or ruthenium (Ru). Is mentioned.

  The electron transport layer 25 has a function of transporting electrons injected from the cathode 27 to the light emitting layer 24. The electron transport layer 25 is, for example, a coating film. The electron transport layer 25 includes an organic material having an electron transport property (hereinafter, referred to as “electron transport material 25M”) as a main component.

  The electron transport layer 25 is interposed between the light emitting layer 24 and the cathode 27 and has a function of transporting electrons injected from the cathode 27 to the light emitting layer 24. The electron transporting material 25M that is a raw material (material) of the electron transporting layer 25 is, for example, an aromatic heterocyclic compound containing one or more heteroatoms in the molecule. Examples of the aromatic heterocyclic compound include compounds containing a pyridine ring, a pyrimidine ring, a triazine ring, a benzimidazole ring, a phenanthroline ring, a quinazoline ring or the like in the skeleton. Further, the electron transport layer 25 may include a metal having an electron transport property. The electron transport layer 25 can improve the electron transport property of the electron transport layer 25 by containing the metal which has electron transport property. Examples of the metal contained in the electron transport layer 25 include barium (Ba), lithium (Li), calcium (Ca), potassium (K), cesium (Cs), sodium (Na), rubidium (Rb), yttrium ( Yb) or the like can be used.

  The organic electroluminescent panel 10 may further include, for example, a sealing layer 17 that seals each organic electroluminescent element 12-2. The sealing layer 17 is provided in contact with, for example, the upper surface of the cathode 27 of each organic electroluminescent element 12-2.

  Next, the pixel bank 18 will be described in detail.

FIG. 7 is a diagram for explaining the static contact angle θ ₁ . FIG. 8 is a diagram for explaining the forward contact angle θ ₂ and the backward contact angle θ ₃ . 9A, 9B, 9C, and 9D are diagrams for explaining an example of a method for measuring the receding contact angle θ ₃ by the contraction method of the expansion / contraction method. is there. FIG. 9A illustrates a state in which the static surface tension of the ink liquid 120 dropped on the substrate 140 is measured. FIG. 9B illustrates a state when the suction pipe 150 is inserted into the ink liquid 120 of FIG. 9A. In FIG. 9C and FIG. 9D, the ink liquid 120 on the substrate 140 is sucked by the suction pipe 150 in the order of FIG. 9C and FIG. The manner in which the contact angle (that is, the receding contact angle θ ₃ ) gradually decreases is illustrated.

FIG. 10 is a diagram illustrating an example of a measurement result of the receding contact angle θ _{3 according to} the embodiment. FIG. 11 is a diagram illustrating an example of a measurement result of the receding contact angle θ _{3 according to} the comparative example. 10 and 11, the ink liquid 120 on the substrate 140 is sucked, whereby the receding contact angle θ ₃ gradually decreases, and finally, until the ink liquid 120 is sucked from the substrate 140. The change of the receding contact angle θ ₃ is described. FIG. 10 shows a result when the substrate 140 is formed of the same material as the pixel bank 18 and the ink liquid 120 is a solution containing the organic light emitting material 24M as a main component of a solute. FIG. 11 shows the result when the substrate 140 is formed of a general material.

In FIG. 7, θ ₁ is the static contact angle of the substrate 110 with respect to the ink liquid 120, γ _SV is the surface tension of the substrate 110, γ _LV is the surface tension of the ink liquid 120, and γ _SL is , The interfacial tension between the substrate 110 and the ink liquid 120. γ _LV is represented by γ _SL + γ _LV cos θ ₁ . In FIG. 8, θ ₂ is the advancing contact angle of the substrate 130 with respect to the ink liquid 120, θ ₃ is the receding contact angle of the substrate 130 with respect to the ink liquid 120, and θ ₀ is the inclination angle of the inclined surface of the substrate 130. It is. In FIG. 8, the ink liquid 120 flows down the inclined surface of the substrate 130. The substrates 110, 130, and 140 are made of the same material as the pixel bank 18.

In the present embodiment, on the side surface of the pixel bank 18, the receding contact angle θ ₃ with respect to the ink liquid 120 is larger than 20 degrees (that is, the minimum value of the receding contact angle θ ₃ of the comparative example). Thereby, the thickness of the light emitting layer 24 can be made more uniform.

The factor causing the receding contact angle is the wetting history (hysteresis). This is a phenomenon that occurs because ink remains on the liquid contact surface of the substrate. Therefore, the value of the receding contact angle does not increase with respect to the value of the static contact angle, and basically becomes a small value. If the amount of ink adhering to the liquid contact surface is large, the receding contact angle is low, and if the amount of ink adhering is small or not adhering, the receding contact angle is maintained at a value close to the static surface tension θ ₁ . It can be seen that when the receding contact angle θ ₃ with respect to the ink liquid 120 is 20 degrees or more, the amount of ink adhering to the bank side wall surface is small. More preferably, the receding contact angle θ ₃ with respect to the ink liquid 120 is 40 degrees or more. If it is 40 degrees or more, it will be in the state where the adhesion amount of the ink to the bank side surface is suppressed. The higher the receding contact angle, the smaller the amount of ink deposited on the bank surface. In order to increase the receding contact angle, it is possible to improve the liquid repellency of the material used for the bank. In this case, the numerical value of the static contact angle θ ₁ may also be increased. At this time, the ink is prevented from being filled to every corner of the bank, leading to the generation of areas that do not emit light. The boundary value is 70 ° at the static contact angle θ ₁ .

Therefore, on the side surface on the organic electroluminescent element 12-2 side, the static contact angle θ ₁ with respect to the ink liquid 120 is 70 degrees or less, and the receding contact angle θ ₃ is 20 degrees or more, more preferably 40 degrees or more. As a result, the coating property in the bank is ensured, the ink adhesion to the bank wall surface is suppressed, and the thickness of the light emitting layer 24 can be made more uniform.

Further, the difference (change amount Δθ = θ ₁ −θ ₃ ) between the static contact angle θ ₁ and the receding contact angle θ _{3 at} the end of the measurement of the receding contact angle θ ₃ is, for example, 30 degrees or less. . In such a case, the thickness of the light emitting layer 24 can be made more uniform.

Evaluation results are presented in Table 1 for Examples and Comparative Examples other than those shown in FIG. 10 (Example 1) and FIG. 11 (Comparative Example 2).

In the present embodiment, the side surface of the pixel bank 18 is formed of, for example, a silicone-based resin that has a receding contact angle θ ₃ larger than 20 degrees and does not have photo-patternable characteristics. In this case, for example, the pixel bank 18 can be formed by molding with a mold. That is, at this time, the pixel bank 18 can be formed by molding using a mold. Therefore, the thickness of the light emitting layer 24 can be made more uniform by a simple method.

  In the present embodiment, the side surface of the pixel bank 18 may be formed of, for example, a resin modified with silicon. In such a case, the pixel bank 18 can be formed by patterning, for example. Therefore, the thickness of the light emitting layer 24 can be made more uniform by a simple method.

As a material capable of maintaining a high receding contact angle θ ₃ usable for the line bank 13, for example, a silicone resin can be raised. However, since a general silicone resin does not have photo-patternable characteristics, it is necessary to devise patterning in order to form a bank shape. On the other hand, resins that have been modified with photo-patternable resins such as acrylic resins and epoxy resins as the main chain and silicone resins in the branched chain, specifically silicone-modified acrylic resins, silicone-modified epoxy resins, etc. In view of the property of the receding contact angle θ ₃ and the ease of manufacturing the bank shape, it can be preferably used.

  Any material can be used for the bank 15 as long as it does not have liquid repellency. A general photoresist can be used because the bank shape needs to be produced. Specifically, an acrylic resin, an epoxy resin, a polyimide resin, etc. can be illustrated.

Since the material used for the pixel bank 18 must keep the receding contact angle θ ₃ high, the same material as that for the line bank 13 can be used. Since this is a place where patterning is necessary, a resin with a modification having a main chain of a photo-patternable resin such as an acrylic resin and an epoxy resin and a silicone resin as a branch, specifically, a silicone-modified acrylic resin, silicone A modified epoxy resin or the like can be preferably used because of the nature of the receding contact angle and the ease of producing the bank shape.

<2. Modification>
In the above embodiment, instead of the pixel bank 18, for example, a plurality of line banks 13 and a plurality of banks 15 as shown in FIGS. 12, 13, and 14 are provided in the organic electroluminescent panel 10. Good. The plurality of line banks 13 and the plurality of banks 15 are provided around each pixel 11. FIG. 12 shows a modification of the schematic configuration of the organic electroluminescence panel 10 according to this modification. FIG. 13 illustrates a cross-sectional configuration example taken along line AA of the organic electroluminescent panel 10 of FIG. FIG. 14 illustrates a cross-sectional configuration example taken along line BB of the organic electroluminescent panel 10 of FIG. The line bank 13 corresponds to a specific example of “a partition wall” of the present disclosure.

  The plurality of line banks 13 extend in the row direction and have, for example, a stripe shape. The plurality of line banks 13 partitions each sub-pixel 12 in each pixel 11. Each bank 15 extends in the column direction and has, for example, a stripe shape. The plurality of banks 15 partitions each pixel 11.

  A region surrounded by two line banks 13 and banks 15 at both ends that are parallel to each other and adjacent to each other is a groove 16. In each sub-pixel 12, each organic electroluminescence element 12-2 is arranged one by one in the gap between two line banks 13 that are parallel to each other and adjacent to each other. That is, in each sub-pixel 12, each organic electroluminescent element 12-2 is arranged one by one in the groove 16. In addition, the two line banks 13 sandwich the organic electroluminescent element 12-2 (light emitting layer 24) from a direction orthogonal to the extending direction of the line bank 13. In each groove 16, each organic electroluminescent element 12-2 is arranged one by one in the gap between two banks 15 adjacent to each other. Therefore, the plurality of line banks 13 and the plurality of banks 15 are provided around the organic electroluminescent element 12-2 (that is, the light emitting layer 24).

  In this modification, the anode 21 is formed, for example, so that the edge of the anode 21 is embedded in the line bank 13. Therefore, at least a part of the edge of the anode 21 is located immediately below the line bank 13, for example. In one subpixel row, the plurality of anodes 21 are arranged at equal intervals in the extending direction of the groove 16, for example.

In the present modification, the receding contact angle θ ₃ with respect to the ink liquid 120 is larger than 20 degrees on the side surface of each line bank 13 on the organic electroluminescent element 12-2 side. Thereby, the thickness of the light emitting layer 24 can be made more uniform. In this modification, each bank 15 is provided in order to prevent two anodes 21 adjacent to each other in the groove 16 from being short-circuited, and has liquid repellency like the line bank 13. Rather, it is lyophilic with respect to the ink liquid 120.

In the present modification, the static contact angle θ ₁ of the ink liquid 120 with respect to the substrate 140 is 70 degrees or less on the side surface of each line bank 13 on the organic electroluminescent element 12-2 side, and the ink liquid 120 The receding contact angle θ ₃ with respect to the substrate 140 may be 40 degrees or more. In such a case, the thickness of the light emitting layer 24 can be made more uniform.

In this modification, the difference (change amount Δθ = θ ₁ −θ ₃ ) between the static contact angle θ ₁ and the receding contact angle θ _{3 at} the end of the measurement of the receding contact angle θ ₃ is, for example, 30 degrees. It is as follows. In such a case, the thickness of the light emitting layer 24 can be made more uniform.

In the present modification, the side surface of each line bank 13 may be formed of a silicone resin having a receding contact angle θ ₃ larger than 20 degrees and having no photo-patternable characteristics. In this case, for example, each line bank 13 can be formed by molding with a mold. That is, at this time, each line bank 13 can be formed by molding with a mold. Therefore, the thickness of the light emitting layer 24 can be made more uniform by a simple method.

  Moreover, in this modification, the side surface of each line bank 13 may be formed of a resin modified with silicone. In such a case, each line bank 13 can be formed by patterning, for example. That is, at this time, each line bank 13 can be formed by patterning. Therefore, the thickness of the light emitting layer 24 can be made more uniform by a simple method.

  Although the present disclosure has been described with the embodiment and the modification, the present disclosure is not limited to the embodiment and the modification, and various modifications can be made. In addition, the effect described in this specification is an illustration to the last. The effects of the present disclosure are not limited to the effects described in this specification. The present disclosure may have effects other than those described in this specification.

For example, this indication can take the following composition.
(1)
An organic layer composed of a coating film;
A partition wall provided around the organic layer,
An organic electroluminescent element, wherein a receding contact angle with respect to an ink liquid containing a raw material for the coating film is larger than 20 degrees on a side surface of each partition wall.
(2)
The organic electroluminescence device according to (1), wherein a static contact angle with respect to the ink liquid is 70 degrees or less and a receding contact angle is 40 degrees or more on a side surface of each partition wall.
(3)
The difference between the static contact angle and the receding contact angle at the end of the measurement of the receding contact angle (= the static contact angle−the receding contact angle) is 30 degrees or less (1) or ( The organic electroluminescent element as described in 2).
(4)
The said partition part is surrounding the said organic layer from the circumference | surroundings. The organic electroluminescent element as described in any one of (1) to (3).
(5)
The said partition part is extended in the predetermined | prescribed direction, The said organic layer is inserted | pinched from the direction orthogonal to the extension direction of the said partition part, (1) to any one of (3) Organic electroluminescent device.
(6)
Comprising an organic electroluminescent panel having a plurality of pixels;
At least one of the plurality of pixels is
An organic layer composed of a coating film;
A partition wall provided around the organic layer,
An organic electroluminescence device, wherein a receding contact angle with respect to an ink liquid containing a raw material for the coating film is larger than 20 degrees on a side surface of each partition wall.

  DESCRIPTION OF SYMBOLS 1 ... Organic electroluminescent apparatus, 10 ... Organic electroluminescent panel, 11 ... Pixel, 12, 12R, 12G, 12B ... Subpixel, 12-1 ... Pixel circuit, 12-2, 12r, 12g, 12b ... Organic electroluminescent element , 13 ... line bank, 14 ... substrate, 15 ... bank, 16 ... groove, 17 ... sealing layer, 18 ... pixel bank, 20 ... controller, 21 ... anode 21 ... hole injection layer 22 ... hole transport layer 23 ... Light-emitting layer 24 ... Electron transport layer 25 ... Electron injection layer 26 ... Cathode, 30 ... Driver, 31 ... Horizontal selector, 32 ... Light scanner, Tr1 ... Drive transistor, Tr2 ... Selection transistor, Cs ... Holding capacitor, DSL ... Power line, DTL: signal line, Vgs: gate-source voltage, Vsig: signal voltage, WSL: selection line.

Claims (6)

An organic layer composed of a coating film;
A partition wall provided around the organic layer,
An organic electroluminescent element, wherein a receding contact angle with respect to an ink liquid containing a raw material for the coating film is larger than 20 degrees on a side surface of each partition wall. 2. The organic electroluminescent element according to claim 1, wherein a static contact angle with respect to the ink liquid is 70 degrees or less and a receding contact angle is 40 degrees or more on a side surface of each partition wall portion. The difference between the static contact angle and the receding contact angle at the end of measurement of the receding contact angle (= the static contact angle−the receding contact angle) is 30 degrees or less. Item 3. The organic electroluminescent device according to Item 2. The organic electroluminescent element according to any one of claims 1 to 3, wherein the partition wall surrounds the organic layer. The said partition part is extended in the predetermined | prescribed direction, The said organic layer is pinched | interposed from the direction orthogonal to the extension direction of the said partition part. Organic electroluminescent device. Comprising an organic electroluminescent panel having a plurality of pixels;
At least one of the plurality of pixels is
An organic layer composed of a coating film;
A partition wall provided around the organic layer,
An organic electroluminescence device, wherein a receding contact angle with respect to an ink liquid containing a raw material for the coating film is larger than 20 degrees on a side surface of each partition wall.