JP2003086366A - Manufacturing method of display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method in which an independent process for forming a barrier rib for separating the picture elements is not necessary and a display device can be manufactured easily. SOLUTION: An ITO 11a is formed by vapor deposition on the glass substrate 10 and an insulating layer 11b made of PVK is formed on it. Then, an ink 21 made of a content of an organic EL membrane (display composition) and a hydrocarbon system solvent is selectively applied using an ink jet head 30 on the place where the picture element is formed on the insulating layer. In the place where the ink 21 is applied, the insulating layer 11b is melted with the solvent contained in the ink, and after the solvent is vaporized, an organic EL membrane 11c that contacts the ITO 11a is formed. Then, LiF/Al is vaporized at a thickness of 1,000 Å by vacuum vapor deposition and the negative electrode 11e is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a display device having a plurality of display elements containing a display composition such as an organic material.

[0002]

2. Description of the Related Art As a method for manufacturing a multi-color display EL display device having a plurality of display elements each exhibiting a different color, Japanese Patent Application Laid-Open Nos. 57-157487 and 58-1 are available.
As disclosed in JP-A-47989 and JP-A-3-214593, there is a method of arranging EL materials which emit light in three primary colors of red, green and blue in a matrix.

In this method, since it is necessary to arrange the light emitting materials of the three primary colors in a matrix with high accuracy, a complicated light exposure process and etching process are required.
Therefore, in order to easily arrange the light emitting materials of the three primary colors,
JP-A-10-12377 and JP-A-11-870.
As shown in Japanese Patent Laid-Open No. 63-63, a bank (partition wall) is prepared in advance.
Has been used, and the bank is used to pattern the EL material.

That is, as shown in FIG. 7, a multicolor display EL display device was manufactured according to the following steps (1) to (3). An anode P11a is provided on the substrate P10 (see FIG. 7).
(A)). The anode P11a is patterned into a predetermined pattern (FIG. 7B).

An insulating layer P11b is formed (see FIG. 7).
(C)). The insulating layer P11b at a position corresponding to the anode P11a is removed by light exposure, and the remaining insulating layer P11b is separated into partition walls P11.
b2 (FIG. 7 (d)). An organic EL material P11c of a predetermined color is arranged in each section separated by the partition wall P11b2 by an inkjet method (FIG. 7E).

A cathode P11d is formed (see FIG. 7).
(F)). In FIG. 7 (f), the cathodes P11d are arranged in parallel in a plane parallel to the anode P11a so as to extend in a direction orthogonal to the anode P11a.

[0007]

However, even in the above method, since a complicated process using light exposure is required to form the partition wall, the manufacturing process of the multicolor display EL display device is complicated. However, there is a problem that the manufacturing cost becomes high.

The present invention has been made in view of the above points, and does not require an independent process for forming partition walls.
It is an object of the present invention to provide a manufacturing method capable of easily manufacturing a display device.

[0009]

Means for Solving the Problems and Effects of the Invention (1) The invention of claim 1 comprises a plurality of display elements each comprising a pair of electrodes and a display composition inserted between the pair of electrodes. A method for manufacturing a display device having a partition wall that insulates between the pair of electrodes and insulates between the display composition of the display element and another display composition of the display element, An insulating layer forming step of forming one electrode of the pair of electrodes and an insulating layer covering the periphery thereof, and a solvent for dissolving the insulating layer at a position on the insulating layer corresponding to the one electrode, and An ink solution applying step of applying an ink solution containing a display composition, and after the insulating layer is dissolved, the solvent of the ink solution is evaporated to form the display composition so as to come into contact with the one electrode. A display composition forming step of On the serial indicating composition, of the pair of electrodes, and an electrode forming step of forming the other electrode,
A gist of the present invention is to provide a method of manufacturing a display device.

According to the method of manufacturing a display device of the present invention, a partition for insulating between the display compositions can be formed at the same time as forming the display composition of the display element. That is, when the ink solution is applied to a predetermined place on the insulating layer, the insulating layer is dissolved by the solvent contained in the ink solution at that place, and after the solvent of the ink solution is evaporated, the ink solution is contained in the ink solution. The component of the display composition forms a display composition in contact with the one electrode, while the insulating layer remains as it is in the insulating layer where the ink solution is not applied. It serves as a partition that separates the composition. Therefore, a display element can be easily manufactured using this partition.

Therefore, the manufacturing method of the display device of the present invention is
Unlike the conventional manufacturing method, since it is not necessary to form the partition wall by a complicated process using light exposure, the display device can be easily manufactured, and the manufacturing cost can be kept low. (2) The invention of claim 2 provides a method of manufacturing a display device according to claim 1, characterized in that the one electrode is formed on a substrate in accordance with a predetermined pattern.

Since the display device manufactured according to the present invention is constructed by laminating it on a substrate, it is possible to impart sufficient rigidity to the display device by using a substrate having high rigidity. Further, in the manufacturing method of the present invention, for example, since the one electrode is formed on the substrate, the position of the one electrode on the substrate is constant.

Therefore, in the ink solution applying step,
For example, if the place where the ink solution is applied is determined with reference to the substrate, the ink solution can be applied accurately to the position corresponding to the one electrode. Examples of the material of the substrate include glass, polyimide, polycarbonate, polyester, polypropylene, and polyethylene terephthalate (PET). (3) The invention of claim 3 provides the method of manufacturing a display device according to claim 1 or 2, wherein the display composition contains a light emitting substance.

In the display device manufactured by the present invention, since the display composition contains a light emitting substance, the display element can emit light by applying a predetermined voltage between the electrodes. As the display composition containing the luminescent substance, for example, a composition comprising a luminescent substance alone, or a luminescent substance,
Some have added supplemental charge transport materials.

The luminescent material in this case is, for example, a polymer-based luminescent material that can be made into an ink, and specifically, a polyparaphenylene vinylene derivative, a polyfluorene derivative, a polythiophene derivative and the like. Examples of the auxiliary charge transport material include oxadiazole, oxazole, triphenylmethane, hydrazoline-based, arylamine-based, hydrazone-based, stilbene-based hole transport materials, and specifically, TPD (N, N'-bis (3-
Methylphenyl) -N, N'-diphenylbenzidine), α-NPD (N, N'-di (1-naphthyl)-
N, N 'diphenylbenzidine), TAPC (1,1-
Bis (di4tolylaminophenyl) -cyclohexane), PPD (N, N'-di (9-phenanthryl)-
N, N'-diphenylbenzidine), TRP, NPB
(A dimer of α-NPD) and the like.

Other examples of the auxiliary charge transport material include electron transport materials such as oxadiazole derivatives, triazole derivatives, and aluminum complexes. Specifically, tBu-PBD (2- (4 -Biphenyl) -5
-(Para-tert-butylphenyl) -1,3,4
-Oxadiazole), TAZ (3- (4'-tert-butylphenyl) -4-phenyl-5- (4 ''-biphenyl) -1,2,4-triazole), AlQ3
(Tris (8-quinolinolato) aluminum (II
I)), BND (2,5-bis (1-naphthyl) -1,
3,4-oxadiazole), Bphen (basophenanthroline), P-EtTAZ (3- (4'-tert-butylphenyl) -4- (paraethylphenyl)-
5- (4 ''-biphenyl) -1,2,4 triazole)
Etc.

Further, as the display composition containing the light emitting substance, there is, for example, one in which a charge transporting material which can be made into an ink is doped with the light emitting substance. Examples of the charge transport material in this case include a polymer having a carbazole derivative in its main chain or a side chain (for example, PVK (poly (N-vinylcarbazole)), a polymer having a triphenylamine derivative in its main chain or a side chain. (Eg PTP
Hole-transporting polymers such as DES (containing tetraphenyldiamine-poly (arylene ester sulfone)) and polymers having an oxadiazole derivative in the main chain or side chain (eg, PVMOXD (polyvinylmethyloxadiazole)), etc. There are electron-transporting polymers.

The luminescent substance in this case is, for example, TPB (tetraphenyl butadiene), perylene,
Coumarin, Rubrene, Nile Red, DCM (4-dicyanomethylene-2-methyl-6-dimethylaminostyryl-4-pyran), DCJTB (4-Dicyanomethylene-6-Cepigelolidinostyryl-2-tertiarybutyl- 4H-pyran), squarylium, an aluminum complex (for example, AlQ3) and the like.

The above-mentioned auxiliary charge transporting material may be further added to the display composition. (4) The invention according to claim 4 is characterized in that the light emitting substance is one or more substances selected from among heteroaromatic compounds, fluorescence of stilbene compounds, and phosphorescent substances. The gist is the manufacturing method of the display device described in (1).

The display device produced by the present invention can emit light with high brightness when a predetermined voltage is applied by containing the above-mentioned luminescent substance in the display composition. Specific examples of the light emitting material include high molecular light emitting materials such as polyparaphenylene vinylene derivative, polyfluorene derivative and polythiophene derivative, and TPB, perylene, coumarin, rubrene, nile red, DCM, DC.
JTB squarylium, aluminum complex (eg Al
There are low molecular weight materials such as Q3). (5) The invention of claim 5 is characterized in that the display composition contains a charge transport material.
The gist is the manufacturing method of the display device described in (1).

The display composition in the display device manufactured by the present invention is, for example, a luminescent substance (for example, a polymer-based luminescent material that can be made into an ink, specifically, a polyparaphenylene vinylene derivative, a polyfluorene derivative). , A polythiophene derivative, etc.) to which a charge transport material is added.

With the above structure, this display device can emit light with high brightness when a predetermined voltage is applied between the electrodes. (6) In the invention of claim 6, the charge transport material is one or more selected from oxadiazole-based, oxazole-based, triphenylmethane-based, hydrazoline-based, arylamine-based, hydrazone-based, and stilbene-based materials. 6. The method for manufacturing a display device according to claim 5, wherein the hole transporting material is, or one or more electron transporting materials selected from oxadiazole derivatives, triazole derivatives, and aluminum complexes. Use as a summary.

The present invention exemplifies charge transport materials. By configuring the display composition of the display device using the above charge transport material, the display device can emit light with high brightness when a predetermined voltage is applied between the electrodes.

Specific examples of the hole transport material include:
TPD, α-NPD, TAPC, PPD, TRP, NP
There is B etc. -Specific examples of the electron transport material include PBD and TA
Z, AlQ3, BND, Bphen, P-EtTAZ and the like.

As the electron-transporting material, a polymer having an oxadiazole derivative as an electron-transporting polymer in its main chain or side chain (for example, PVMOXD) can be used. (7) The invention of claim 7 is the method of manufacturing a display device according to claim 1 or 2, wherein the display composition contains a substance that changes color by redox. To do.

In the display device manufactured by the present invention, the color can be changed by changing the voltage applied between the electrodes of the display element to oxidize or reduce the display composition of the display element. Therefore, this display device can display a predetermined pattern by utilizing the color change of the display composition.

The display element of the present invention includes, for example, an electrochromic element. (8) The display device according to claim 1 or 2, wherein the display composition comprises a polymer substance that changes color due to redox and a polymer electrolyte. The manufacturing method will be summarized.

In the display device manufactured by the present invention, by changing the voltage applied between the electrodes of the display element, the display composition of the display element can be oxidized or reduced to change its color. Therefore, this display device can display a predetermined pattern by utilizing the color change of the display composition.

Examples of the polymer substance include polyaniline and polyvirol derivatives. Examples of the polymer electrolyte include polymethylmethacrylate (PMMA), polyethylene oxide (PEO), polyacrylonitrile (PAN) and the like. (9) The invention of claim 9 is characterized in that the insulating layer is PVK (poly (N-vinylcarbazole)), polystyrene, nylon, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyphenylene oxide, polyarylate, polysulfone, polyphenylene. The gist of the method for producing a display device according to any one of claims 1 to 8 is that the display device is made of one or more substances selected from sulfides, polyamideimides, polyimides, and fluororesins.

The present invention illustrates an insulating layer. By using the above materials as the insulating layer, it is possible to ensure the insulation between the electrodes of the display element and the insulation between the display compositions of the display element. Further, since the above materials can be dissolved in a predetermined solvent, in the ink solution applying step, by dissolving the insulating layer at the place where the ink solution is applied by the solvent contained in the ink solution, The display composition can be formed to reach the electrodes. (10) In the invention of claim 10, the solvent is a hydrocarbon hydrocarbon solvent, a halogen hydrocarbon solvent, an alcohol solvent, a ketone, an aldehyde, dodecylbenzene, tetralin, dichloroethane, ethylene glycol, propylene glycol, ethylene glycol mono. A method of manufacturing a display device according to any one of claims 1 to 9, characterized by comprising one or more substances selected from ethyl ether.

The present invention exemplifies the solvent contained in the ink solution. Since the solvent can dissolve the insulating layer, in the ink applying step, by using an ink solution containing these solvents, the insulating layer at the place where the ink solution is applied is dissolved, and The display composition can be formed to reach the electrodes. (11) The invention of claim 11 is characterized in that the solubility of the insulating layer in the solvent is smaller than the solubility of the display composition in the solvent.
The gist is the method for manufacturing the display device described in any one of 0.

In the ink solution applying step of the manufacturing method of the present invention, the insulating layer at the location where the ink solution is applied is dissolved by the solvent. In the next display composition forming step, the solvent of the ink solution is evaporated, the components contained in the ink solution are solidified to form the display composition, and the dissolved insulating layer is also solidified again. To do.

At this time, the solubility of the insulating layer in the solvent is
Since the solubility is lower than that of the display composition, the insulating layer segregates in the peripheral portion of the place where the ink solution is applied, and the display composition segregates in the central portion of the place where the ink is applied.
As a result, the components of the insulating layer are less likely to be mixed in the display composition, and the display element has excellent light emitting characteristics. (12) The invention according to claim 12 is characterized in that, in the ink solution applying step, the ink solution is applied by using an ink jet method, and the display device according to any one of claims 1 to 11 is manufactured. The method is the gist.

According to the present invention, in the ink solution applying step,
The method of applying the ink solution is illustrated. According to the inkjet method, the ink solution can be applied thinly and uniformly. Therefore, according to the present invention, it is possible to form a display composition having a thin and uniform film thickness.

Further, according to the ink jet method, the ink solution can be applied only to a necessary place. Therefore, as compared with the method of applying the ink solution to the entire surface such as the dip coating method or the spin coating method, the ink solution is applied. The amount of solution used is small. Further, for example, by controlling the position of the inkjet head, it is possible to selectively apply the ink solution to a required place, so that, for example, a step of forming a mask for separately applying the ink solution is unnecessary. is there.

Examples of the inkjet head used in the inkjet method include a piezoelectric element type inkjet head and a bubble jet (registered trademark) type inkjet head. (13) The invention of claim 13 is characterized in that, in the ink solution applying step, the ink solution is applied by using a printing method, and the display device according to any one of claims 1 to 11, is manufactured. The method is the gist.

In the present invention, in the ink solution applying step,
The method of applying the ink solution is illustrated. According to the printing method, for example, by forming a mask in advance on a portion of the insulating layer that does not need to be coated with the ink solution, the ink solution can be selectively coated on a required portion of the insulating layer. (14) The invention according to claim 14 is characterized in that the viscosity of the ink solution is in the range of 1 × 10 ⁻³ to 1 × 10 Pa · s. The gist is the method of manufacturing the device.

In the production method of the present invention, the viscosity of the ink solution is within the above range (more preferably 5 × 10 ^{−3 to} 1.5 × 1).
Within the range of 0 ⁻² Pa · s), for example, when the ink solution is applied by the inkjet method, it is easy to control the drop diameter of the ink.

Further, for example, when the ink solution is applied by a printing method, the viscosity of the ink solution is within the above range (more preferably, 1 × 10 ^-1 to 1 × 10 Pa · s).
By virtue of being present, it is excellent in printability of a fine pattern. (15) In the invention of claim 15, in the step of forming the composition for a display element, in a temperature range of 10 to 100 ° C.,
The method according to claim 1, wherein the solvent is evaporated.
The gist is the method for manufacturing a display device according to any one of 14 above.

In the manufacturing method of the present invention, since the solvent is evaporated at a temperature of 10 ° C. or higher, the time required for evaporation can be shortened. Further, in the present invention, since the solvent is evaporated at a temperature of 100 ° C. or lower, members (eg, substrate, electrode, insulating layer, display composition) constituting the display device are not deformed or deteriorated.

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION An example (embodiment) of an embodiment of a method for manufacturing a display device of the present invention will be described below. (Example 1) Here, an organic EL display will be described as an example of a display device.

A) First, the overall structure of the organic EL display 1 will be described with reference to FIG. Organic EL display 1
Is a glass substrate 10, an organic EL element 11 (display element) arranged on the glass substrate 10, and a current drive TFT 1.
2. The organic EL element 11 including the horizontal driving circuit 13, the vertical driving circuit 14, and the sealing layer 16 is formed in the central portion of the glass substrate 10, and has a grid pattern of 15 pixels. It is divided. Each pixel includes an organic EL film 11c (composition for display), an anode (ITO (Indium Titanium Oxide) 11a) sandwiching the organic EL film 11c from above and below, and a cathode 11e.

Each pixel of the organic EL element 11 has an anode I
When a DC voltage is applied between the TO 11a and the cathode 11e, it emits light, passes through the glass substrate 10 and irradiates light downward (downward in FIG. 1). On the other hand, when the voltage between the anode (ITO 11a) and the cathode 11e is OFF, the light is extinguished.

The current driving TFT 12 is provided for each pixel of the organic EL element 11 and acts as a switch for controlling the current supply to the corresponding pixel. The horizontal drive circuit 13 and the vertical drive circuit 14
Turns on or off the current driving TFT 12 corresponding to each pixel, thereby performing independent light emission and extinction control of each pixel.

The sealing layer 16 includes the organic EL element 11, the current driving TFT 12, the horizontal driving circuit 13, and the vertical driving circuit 1.
4. The P-Si TFT 15 is covered and protected from above. b) Next, the current drive TFT 12 will be described with reference to FIGS. 1, 2, and 3.

As shown in FIG. 1, the organic EL display 1 has a current drive TF for each pixel of the organic EL element 11.
T12 is provided. This current drive TFT 12 is
As shown in FIG. 2, the organic EL element 11 functions as a switch that controls the supply of current to each pixel.

The structure of the current drive TFT 12 will be described with reference to the equivalent circuit of FIG. Note that FIG. 3 is a repetitive diagram for six pixels. As shown in FIG. 3, the current driving TFT 12 is a data line 1 connected to the vertical driving circuit 14.
2f, a scanning line 12e connected to the horizontal drive circuit 13, a scanning signal via the scanning line 12e, a memory TFT 12b supplied to the gate electrode thereof, and an electric charge (image signal) supplied from the data line 12f via the memory TFT 12b. ,
Capacitor 12c for holding, drive TFT in which the image signal held by the capacitor 12c is supplied to the gate electrode
12a, the anode of the organic EL element (ITO 11
A drive current flows from the power supply line 12d into the drive circuit 12a via the drive TFT 12a.

In the current drive TFT 12, when the scanning line 12e is turned on by the horizontal drive circuit 13 and the data line 12f is turned on by the vertical drive circuit 14, the memory TFT 12b operates and the electric charge is stored in the capacitor 12c. The driving TFT 12 is operated for a time corresponding to this charge.
a operates, and the drive TFT 12a, from the power line 12d,
A current flows to the cathode 11e through the anode (ITO 11a) and the organic EL film 11c, and the pixel corresponding to the current driving TFT 12 emits light.

On the other hand, the scanning line 1 is driven by the horizontal drive circuit 13.
When 2d is turned off or the data line 12e is turned off by the vertical drive circuit 14, the memory TFT 12
Since b does not operate and no current flows in the organic EL film 11c, the pixel corresponding to the current drive TFT 12 is extinguished.

C) Next, a method of manufacturing the organic EL display 1 will be described with reference to FIG. In addition, FIG. 4 shows an organic EL.
It is a figure which shows only the part of the organic EL element 11 among the displays 1. Here, a method for manufacturing the organic EL element 11, which is a main part, will be described in particular.

As shown in FIG. 4a, ITO 11a having a thickness of 150 nm was vapor-deposited on the glass substrate 10 to form an anode. The surface resistance of this ITO 11a is 500 to 600 μm.
Ω / cm, and the light transmittance was 81%.

A resist 20 for exposure was applied on the ITO 11a thus formed by spin coating, and a desired electrode pattern was mask-exposed. After that, the resist 20 and the ITO 11a in the unexposed portion were removed by etching using aqua regia which is a mixed solution of concentrated nitric acid and concentrated hydrochloric acid, and a desired electrode pattern was formed as shown in FIG. 4b.

The surface of the ITO 11a is washed with a neutral detergent, acetone, IPA (isopropyl alcohol),
And UV ozone cleaning. The purpose of these cleanings is (i) to remove stains on the ITO 11a, and (ii) to reduce oxygen defects on the surface of the ITO 11a and lower the hole injection barrier.

Among them, the UV ozone cleaning can remove stains of organic substances which cannot be removed by the wet cleaning. As shown in FIG. 4C, PVK is formed on the entire portion of the glass substrate 10 where the organic EL element 11 is formed by spin coating, dipping, curtain coating, bar coating, printing or ink jetting. Insulating layer 1
1b was formed.

The insulating layer 11b may have any thickness as long as it can maintain the insulation between the ITOs 11a, and a thinner one is preferable from the viewpoint of high resolution and high image quality in view of the ink droplet diameter (drop diameter). Further, the insulating layer 11b is dissolved in a step described later, and therefore, a semi-cured state (a state where it is not completely cured) is desirable.

Next, an ink 21 (ink solution) comprising the components of the organic EL film (composition for display) and the hydrocarbon solvent was prepared. Specifically, the following components were prepared by mixing them in corresponding weight ratios.

A polymer compound having a carbazole derivative, which is a hole-transporting polymer, in its main chain or side chain (P
VK): 16 weight ratio Electron transport material (BND): 4 weight ratio Emission center forming compound (TPB): 1 weight ratio Hydrocarbon solvent (tetralin): Ink 21
Weight ratio at which the total concentration of PVK, BND, and TPB is 2% wt. The viscosity of the ink 21 is 1 × 10 ⁻³ to 1 × 10 Pa ·
However, 5 × 10 ⁻³ to 1.
The range of 5 × 10 ⁻² Pa · s is desirable for controlling the drop diameter when ejecting the ink 21 using the inkjet method.

The surface tension of the ink 21 is 20
It is preferably in the range of ˜50 mN / m since flight bending can be suppressed when the ink is ejected by the inkjet method. As shown in FIG. 4d, the ink 21 prepared above is
The inkjet head 30 was used to selectively coat 15 locations on the insulating layer where pixels were to be formed.

As shown in FIG. 5, the ink jet head 30 is a piezoelectric element type ink jet head having a piezoelectric element 30a, and from an orifice 30b formed in an ink jet head main body 30d in response to a signal from a driver 30c. , A drop of ink 21 is ejected.

The ejection driving frequency was set to 1 KHz, and the liquid amount of one drop was set to 50 μl. At the location where the ink 21 is applied, as shown in FIG. 4e, the insulating layer 11b is dissolved by the solvent contained in the applied ink, and the ink 21 reaches the ITO 11a.

By drying at 50 to 60 ° C. for 30 minutes, the solvent in the ink 21 was evaporated, and the display composition, which is a non-volatile component of the ink 21, was solidified in a state having electrical connection with the ITO 11a. This solidified display composition is used as the organic EL film 11c.

The solidified 15 organic EL films 11c are provided.
Each corresponds to one pixel. At this time, as shown in FIG. 4e, the insulating layer 11b dissolved by the ink 21 is formed.
Is segregated in the peripheral portion of the portion where the ink 21 is dropped, and the display composition contained in the ink 21 is solidified at the center of the portion where the ink 21 is dropped.

The reason for this is considered that the display composition has a higher solubility in the solvent contained in the ink 21 than that of the insulating layer 11b. Further, the insulating layer 11b in the portion where the ink 21 is not applied remains without being dissolved, and becomes the partition wall 11d that separates the organic EL film 11c.

As shown in FIG. 4f, LiF (lithium fluoride) / Al was formed according to a predetermined pattern by mask vacuum evaporation, and this was used as a cathode 11e. At this time, the thicknesses of the LiF layer and the Al layer are 10Å and 10
It was set to 00Å and continuously laminated.

The organic EL element 11 is formed in the central portion of the glass substrate 10 as described above, and the glass substrate 1 is formed.
In the peripheral part of 0, the horizontal drive circuit 13 and the vertical drive circuit 14
To form. Furthermore, the organic EL display 1 is completed by covering the organic EL element 11, the horizontal drive circuit 13, and the vertical drive circuit 14 with the sealing layer 16.

The sealing layer 16 is made of a glass plate, and is dried so that a gap of 0.3 to 0.5 mm is formed between the sealing layer 16 and the organic EL element 11 on the lower surface (lower surface in FIG. 1). Agent is attached. When the sealing layer 16 is attached, nitrogen gas is filled in the gap.

D) Organic EL display 1 of the first embodiment
The manufacturing method of 1 has the following effects. In the method for manufacturing the organic EL display 1 of the first embodiment, the ink 21 containing the display composition and the solvent is applied to the place where the pixel is to be formed to form the organic EL film 11c and the organic EL film. Partition wall 11d separating 11c
Can be simultaneously performed.

That is, in the portion coated with the ink 21, the solvent contained in the ink 21 dissolves the insulating layer 11b to form the organic EL film 11c, and in the portion not coated with the ink 21, the insulating layer 11b remains. , A partition wall 11d separating the pixels. Therefore, unlike the conventional method for manufacturing an organic EL element, it is not necessary to perform independent steps such as exposure and etching to form the partition walls between the organic EL films.

Therefore, in the method of manufacturing the organic EL display 1 of the first embodiment, the manufacturing process can be shortened,
Manufacturing costs can be reduced. By using the piezoelectric element method as the inkjet head 30, unlike the bubble jet (registered trademark) method, there is no heat source for ejecting ink, so deterioration of the ink material does not occur, and the selection range of the solvent of the ink 21 Is wide, the amount of droplets of the ejected ink 21 can be easily controlled, the driving frequency can be increased, and the durability is high. (Embodiment 2) In Embodiment 2, an electrochromic display will be described as an example of a display device. The second embodiment corresponds to claims 7 and 8.

A) Electrochromic display 2
The overall structure of is basically the same as that of the organic EL display 1 of the first embodiment, but an electrochromic element 51 shown in FIG. 6 is provided instead of the organic EL element 11. The electrochromic element 51 basically has the same structure as the organic EL element 11 of Example 1, but is different in that an electrochromic film 51a is provided as a display composition.

That is, the electrochromic device 51
As shown in FIG. 6, the anode (IT
O51c), an electrochromic film 51a, and a cathode (ITO 51d) are sequentially laminated,
ITO 51c is provided between the glass substrate 50 and the ITO 51d.
Further, the insulating layer 51e is formed so as to fill the portion where the electrochromic film 51a is not formed. Further, as shown in FIG. 6, the electrochromic film 51a has a polymer electrode 51a1 and a polymer electrolyte 51a2.
It consists of two layers.

This electrochromic display 2
The coloring mechanism is that when a DC voltage is applied between the anode and the cathode and the anode is set to the + side, an oxidation reaction occurs and the color becomes different from that in the neutral state (state in which no voltage is applied). When the anode is set to the-side, a reduction reaction occurs and the color becomes different from that at the time of oxidation. In this way, display control is performed by controlling the potential of the anode.

B) Next, a method of manufacturing the electrochromic display 2 will be described. Here, in particular, a method of manufacturing the electrochromic element 51, which is a main part, will be described. The glass substrate 50 is the same as in c) to Example 1 above.
An anode (ITO 51c) was formed on the upper surface in a predetermined pattern.

As in c) of Example 1, an insulating layer 51e made of PVK was formed on the entire portion of the glass substrate 50 where the electrochromic element 51 is formed. Next, the ink 6 composed of the component of the polymer electrode 51a1 of the electrochromic film 51a and the hydrocarbon solvent.
1 (ink solution) was prepared.

Specifically, PVK (poly (N-vinylcarbazole)) and PSNPhS (poly (N-phenyl-2 (2'-thienyl) -5- (5 "-vinyl-2" thienyl) pyrrole) are used. Was mixed at a ratio of 1: 4, and the mixture was dissolved in tetralin so that the concentration of this mixture was 4 wt%, and ink 61 was obtained.

This ink 61 is used as c) in the first embodiment.
, And was selectively applied onto the insulating layer 51e to form the polymer electrode 51a1. Next, an ink 62 (ink solution) including the components of the polymer electrolyte 51a2 of the electrochromic film 51a and the hydrocarbon solvent was prepared.

Specifically, the ink 62 was prepared by mixing the following components and dissolving them in tetralin. At this time, the amount of tetralin was adjusted so that the viscosity of the ink 62 was 0.1 to 10 Pa · s. Polymethylmethacrylate (Molecular weight 120,000): 5
00 mg Propylene carbonate: 1 ml Ethylene carbonate: 2 g Lithium tetrafluoroborate: 100 mg Acetonitrile: 3 ml This ink 62 is applied onto the polymer electrode 51a1 using an inkjet method to form a polymer electrolyte 51a2.
Was formed.

A cathode made of ITO (IT
O51d) was formed. The electrochromic device 51 as described above
Is formed in the central portion of the glass substrate 50, and a horizontal driving circuit and a vertical driving circuit are formed in the peripheral portion of the glass substrate 50 in the same manner as in the first embodiment.
The electrochromic display 2 was completed by covering the electrochromic element 51, the horizontal drive circuit, and the vertical drive circuit with 6.

C) The electrochromic display 2 of the second embodiment has the same effect as the organic EL display 1 of the first embodiment. It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the scope of the present invention.

As the insulating layer in Examples 1 and 2, instead of PVK, for example, polystyrene, nylon (polyamide), polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyphenylene oxide, polyarylate,
Any of polysulfone, polyphenylene sulfide, polyamide imide, polyimide, and fluororesin can be used.

In Example 1, instead of the polymer having a carbazole derivative in the main chain or side chain (PVK) as the polymer constituting the ink, for example,
Polymer compound having triphenylamine derivative in main chain or side chain (eg PTPDES), polymer compound having electron transporting polymer, oxadiazole derivative in main chain or side chain (eg PVMOXD), PP
V (polyparaphenylene vinylene), PPF, PPT,
Other derivatives can be used.

In Examples 1 and 2, the solvent constituting the ink is, for example, a halogen hydrocarbon solvent, an alcohol solvent, a ketone, an aldehyde, dodecylbenzene, tetralin, or dichloroethane, instead of the hydrocarbon solvent. , Ethylene glycol, propylene glycol, or ethylene glycol monoethyl ether can be used.

As the luminescence center forming compound in Example 1, instead of TPB, for example, perylene, coumarin, rubrene, Nile red, DCM, DCJT
B, squarylium, aluminum complex (eg AlQ
3) etc. can be used. In the second embodiment, the electrochromic film 51
A can be formed by applying an ink in which both the component of the polymer electrode and the component of the polymer electrolyte are dissolved in an organic solvent such as tetralin by an inkjet method.

In the second embodiment, the polymer electrode 5
The component of 1a1 is, for example, polyaniline, poly (N-methylpyrrole), poly (3- (3-thienylpropyl sulfonate)), (poly (N-phenyl-2 (2′-thienyl) -5- (5 ″). It may be a polymer containing at least one of -vinyl-2 "thienyl) pyrrole, polyvinyl carbazole, and polyvinyl methyl ether.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an organic EL display 1 of Example 1.

FIG. 2 is an explanatory diagram showing a circuit configuration of one pixel of the organic EL element 11 in Example 1.

FIG. 3 is an explanatory diagram showing a configuration of a current drive circuit 12 according to the first embodiment.

FIG. 4 is an explanatory diagram showing a manufacturing process of the organic EL element 11 in Example 1.

FIG. 5 is an inkjet head 30 according to the first embodiment.
It is explanatory drawing which shows the structure of.

FIG. 6 is an explanatory diagram showing a configuration of an electrochromic display of Example 2.

FIG. 7 is an explanatory diagram showing a conventional method for manufacturing an organic EL display.

[Explanation of symbols]

1 ... Organic EL display 2. Electrochromic display 10, 50 ... Glass substrate 11 ... Organic EL element 11a, 51c, 51d ... ITO 11b, 51e ... Insulating layer 11c ... organic EL film 12 ... Current drive TFT 13 ... Horizontal drive circuit 14 ... Vertical drive circuit 16, 56 ... Sealing layer 21 ... Ink solution 30 ... Inkjet head 51 ... Electrochromic element 51a1 ... Polymer electrode 52a2 ... Polymer electrolyte

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05B 33/12 H05B 33/12 B 33/14 33/14 B 33/22 33/22 Z (72) Invention Miki Shibata 10-17 Suehiro-cho, Takaoka-shi, Toyama F-term (reference) 3K007 AB11 AB13 AB18 BA06 BB04 BB05 BB07 CA01 CB01 DA01 DB03 EB00 FA01 GA04 5C094 AA42 AA43 AA44 AA48 BA03 BA27 BA54 CA25 DA09 DA02 DB01 DB04 DB04 DB04 FA01 FA02 FB01 FB15 FB20 GA10 GB10 JA20 5G435 AA17 BB05 BB13 CC09 HH01 HH14 HH20 KK05 KK10

Claims (15)

[Claims] 1. A display device comprising a plurality of display elements comprising a pair of electrodes and a display composition inserted between the pair of electrodes, for insulating between the pair of electrodes and for displaying the display element. A method of manufacturing a display device having a partition wall that insulates between a composition and another display composition of the display element, wherein an insulating layer covering one electrode of the pair of electrodes and the periphery thereof is formed. An insulating layer forming step, and a position on the insulating layer corresponding to the one electrode, an ink solution applying step of applying an ink solution containing a solvent that dissolves the insulating layer and the display composition, After the insulating layer is dissolved, the solvent of the ink solution is evaporated, and a display composition forming step of forming the display composition so as to come into contact with the one electrode, and on the display composition, The other of the pair of electrodes Method of manufacturing a display device characterized by having electrodes forming step of forming an electrode, the. 2. The one electrode is formed according to a predetermined pattern on a substrate.
A method for manufacturing the display device according to. 3. The method for manufacturing a display device according to claim 1, wherein the display composition contains a light emitting substance. 4. The luminescent material is a heteroaromatic compound,
4. The method for manufacturing a display device according to claim 3, wherein the display device is one or more substances selected from fluorescent and phosphorescent substances of stilbene compounds. 5. The method for manufacturing a display device according to claim 3, wherein the display composition contains a charge transport material. 6. The charge transport material is one or more hole transport materials selected from oxadiazole series, oxazole series, triphenylmethane series, hydrazoline series, arylamine series, hydrazone series, and stilbene series, Alternatively, the display device manufacturing method according to claim 5, wherein the display device is one or more electron transport materials selected from an oxadiazole derivative, a triazole derivative, and an aluminum complex. 7. The method for manufacturing a display device according to claim 1, wherein the display composition contains a substance that changes color by redox. 8. The method of manufacturing a display device according to claim 1, wherein the display composition comprises a polymer substance that changes color by redox and a polymer electrolyte. 9. The insulating layer comprises PVK (poly (N-vinylcarbazole)), polystyrene, nylon, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyphenylene oxide, polyarylate, polysulfone, polyphenylene sulfide, polyamideimide, 9. The method of manufacturing a display device according to claim 1, wherein the display device is made of one or more substances selected from polyimide and fluororesin. 10. The solvent is selected from hydrocarbon hydrocarbon solvents, halogen hydrocarbon solvents, alcohol solvents, ketones, aldehydes, dodecylbenzene, tetralin, dichloroethane, ethylene glycol, propylene glycol, ethylene glycol monoethyl ether. The method for manufacturing a display device according to any one of claims 1 to 9, wherein the display device is made of one or more selected substances. 11. The method for manufacturing a display device according to claim 1, wherein the solubility of the insulating layer in the solvent is smaller than the solubility of the display composition in the solvent. . 12. The method for manufacturing a display device according to claim 1, wherein in the ink solution applying step, the ink solution is applied by using an inkjet method. 13. The method for manufacturing a display device according to claim 1, wherein in the ink solution applying step, the ink solution is applied using a printing method. 14. The viscosity of the ink solution is 1 × 10 ^−3.
The method for manufacturing a display device according to claim 1, wherein the display device is in the range of 1 × 10 Pa · s. 15. The display device according to claim 1, wherein the solvent is evaporated in a temperature range of 10 to 100 ° C. in the step of forming the composition for display elements. Method.