JP2003086358A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device having a substrate 11, on which organic electroluminescent elements 10R, 10G, 10B are mounted, enabled to easily stick a driving panel 10, taking out light from the organic electroluminescent elements 10R, 10G, 10B side, to a sealing panel 21 whose color filter 22 is formed on a sealing panel 20. SOLUTION: The light transmission factor of a red color filter 22R and a blue light filter 22B are made not less than 10% at least at a part of wave length area of 300 nm-430 nm by selecting the material. The light transmission factor of a green color filter 22G at the above wave length area is 10% or less, and an ultraviolet ray transmission area is formed of an opening 22G1 or the like. By the above, a driving panel 10 and a sealing panel 20 can be easily stuck with each other through an adhesive 30 made of ultraviolet ray hardening resin by irradiating ultraviolet ray from the sealing panel 20 side.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an organic electroluminescence device (organic EL; Electroluminescence device) on a driving substrate.
The present invention relates to a display device in which a drive panel provided with and a sealing panel are bonded together via an adhesive layer.

[0002]

2. Description of the Related Art In recent years, as an alternative display device to a liquid crystal display, an organic EL display using an organic electroluminescent element has been attracting attention. Since the organic EL display is a self-luminous type, it has a wide viewing angle and low power consumption, and is considered to have sufficient responsiveness to high-definition high-speed video signals. And is being developed for practical use.

As an organic electroluminescence device, for example, one in which a first electrode, an organic layer including a light emitting layer, and a second electrode are sequentially laminated on a driving substrate is known. The organic electroluminescent element is sealed by a sealing substrate that faces the driving substrate via an adhesive layer made of, for example, an ultraviolet curable resin. The light generated in the light emitting layer may be extracted from the driving substrate side, or may be extracted from the second electrode side. In an organic EL display using such an organic electroluminescent element, there is a problem that the organic electroluminescent element and the wiring electrodes between the elements have large reflection of external light, and the contrast of the display is lowered.

Therefore, a method of preventing reflection of external light by disposing a color filter or a reflected light absorbing film has been considered. For example, in the case of extracting light from the driving substrate side, a color filter or the like is arranged on the driving substrate, an ultraviolet curable resin layer is formed thereon, and after curing, an organic electroluminescent element is formed. It has been reported (Japanese Patent Laid-Open No. 11-260562). After forming the organic electroluminescent element on the driving substrate, the organic electroluminescent element is sealed with a layer of an ultraviolet curable resin and a sealing substrate, and a color filter or the like is provided on the driving substrate side. It has been reported that a substrate is provided and a drive substrate and an auxiliary substrate are adhered to each other by a layer of an ultraviolet curable resin provided only on a peripheral portion (Japanese Patent Laid-Open No. 11-3456).
No. 88).

[0005]

However, in the case of taking out light from the second electrode side, a color filter must be provided on the side of the sealing substrate that seals the organic electroluminescent element, and moreover, Since the color filter and the reflected light absorption film have low ultraviolet transmittance of wavelength of 430 nm or less, it is difficult to cover the organic electroluminescent element with the adhesive layer made of the ultraviolet curable resin and to attach the sealing substrate as in the conventional case. There was a problem.

The present invention has been made in view of the above problems, and an object thereof is to provide a driving panel in which an organic electroluminescent element is provided on a driving substrate and to extract light from the organic electroluminescent element side, and for sealing. An object of the present invention is to provide a display device which can be easily attached to a sealing panel having a substrate provided with a color filter.

[0007]

A display device according to the present invention comprises a plurality of organic electroluminescent devices in which a first substrate, one or more organic layers including a light emitting layer, and a second electrode are sequentially laminated on a driving substrate. And a driving panel for extracting light generated in the light emitting layer from the second electrode side, and a sealing substrate which is disposed opposite to the second electrode side of the driving panel and has a color filter provided on a sealing substrate. Provided between the panel and the sealing panel and the driving panel so as to cover the organic electroluminescent element,
And an adhesive layer made of an ultraviolet curable resin.

In the display device according to the present invention, since the sealing substrate is provided with the color filter, even if the external light incident from the sealing panel is reflected by the organic electroluminescent element or the like,
Ejection from the sealing panel is prevented and contrast is improved. Moreover, since the adhesive layer is provided so as to cover the organic electroluminescent element, the organic electroluminescent element is reliably sealed. Further, since the adhesive layer is made of the ultraviolet curable resin, the drive panel and the sealing panel can be easily attached to each other.

The color filter preferably has an ultraviolet ray transmitting region having a light transmittance of 10% or more in at least a part of a wavelength region of 300 nm or more and 430 nm or less. This makes it possible to easily cure the adhesive layer made of the ultraviolet curable resin.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment] FIG. 1 shows a first embodiment of the present invention.
3 shows a cross-sectional structure of the display device according to the embodiment. This display device is used as an ultra-thin organic EL color display device or the like. For example, the drive panel 10 and the sealing panel 20 are arranged to face each other, and the entire surface is attached by an adhesive layer 30 made of an ultraviolet curable resin. Have been combined. The driving panel 10 includes, for example, an organic electroluminescent element 10R that emits red light, an organic electroluminescent element 10G that emits green light, and an organic electroluminescent element 10G that emits green light on a driving substrate 11 made of an insulating material such as glass. The organic electroluminescent device 10B that generates light is sequentially provided in a matrix as a whole.

This organic electroluminescent device 10R, 10G, 1
0B has, for example, a structure in which an anode 12, which is a first electrode, an insulating layer 13, an organic layer 14, and a cathode 15, which is a second electrode, are laminated in this order from the driving substrate 11 side. The anode 12 and the cathode 15 are common to the organic electroluminescent elements 10R, 10G, 10B in the directions orthogonal to each other, and the organic electroluminescent elements 10R, 10G, 10B.
It also has a function as a wiring for supplying a current to B.

The anode 12 has, for example, a thickness in the stacking direction (hereinafter, simply referred to as thickness) of about 200 nm, and platinum (Pt), gold (Au), silver (Ag), chromium (Cr), or tungsten (W). ) And other metals, or alloys thereof.

The insulating layer 13 ensures the insulation between the anode 12 and the cathode 15, and at the same time, the organic electroluminescent elements 10R and 10R.
This is for accurately setting the shape of the light emitting region in G and 10B to a desired shape. The insulating layer 13 has a thickness of, for example, about 600 nm, is made of an insulating material such as silicon dioxide (SiO ₂ ), and has an opening 13A corresponding to the light emitting region.

The organic layer 14 is an organic electroluminescent device 10R,
The configuration is different for each of 10G and 10B. FIG. 2 is an enlarged view showing the configuration of the organic layer 14 in the organic electroluminescent elements 10R and 10G. Organic electroluminescent device 10
In R and 10G, the organic layer 14 has a structure in which a hole injection layer 14A, a hole transport layer 14B, and a light emitting layer 14C each made of an organic material are stacked in this order from the anode 12 side. The hole injection layer 14A and the hole transport layer 14B are for improving the efficiency of hole injection into the light emitting layer 14C. The light emitting layer 14C emits light by injecting a current, and emits light in a region corresponding to the opening 13A of the insulating layer 13.

In the organic electroluminescent device 10R, the hole injection layer 14A has a thickness of, for example, about 30 nm.
4 ′, 4 ″ -tris (3-methylphenylphenylamino) triphenylamine (MTDATA). The hole transport layer 14B has, for example, a thickness of 30 n.
It is about m and is composed of bis [(N-naphthyl) -N-phenyl] benzidine (α-NPD).
The light emitting layer 14C has a thickness of, for example, about 40 nm,
4-Dicyanomethylene-6- (p-dimethylaminostyryl) on 8-quinolinol aluminum complex (Alq)
It is composed of 2-methyl-4H-pyran (DCM) mixed at a ratio of 2% by volume.

In the organic electroluminescent device 10G, the hole injection layer 14A and the hole transport layer 14B are the organic electroluminescent device 1
The hole transport layer 1 is made of the same material as 0R.
The thickness of 4A is, for example, about 30 nm.
The thickness of 4B is, for example, about 20 nm. Light emitting layer 14C
Has a thickness of, for example, about 50 nm and is composed of 8-quinolinol aluminum complex (Alq).

FIG. 3 is an enlarged view showing the structure of the organic layer 14 in the organic electroluminescent device 10B. In the organic electroluminescent device 10B, the organic layer 14 has a structure in which a hole injection layer 14A, a hole transport layer 14B, a light emitting layer 14C, and an electron transport layer 14D each made of an organic material are stacked in this order from the anode 12 side. Have The electron transport layer 14D is for increasing the efficiency of injecting electrons into the light emitting layer 14C.

In the organic electroluminescence device 10B, the hole injection layer 14A and the hole transport layer 14B are the organic electroluminescence device 1
The hole transport layer 14A is made of the same material as 0R and 10G, and the thickness of the hole transport layer 14A is, for example, about 30 nm, and the thickness of the hole transport layer 14B is, for example, about 30 nm. The light emitting layer 14C has a thickness of, for example, about 15 nm and is made of bathocuproine (BCP). The electron transport layer 14D has, for example, a thickness of about 30 nm and is made of Al
It is composed of q.

As shown in FIGS. 2 and 3, the cathode 15 has a semi-transmissive electrode 15A which is semi-transmissive to the light generated in the light emitting layer 14C, and the light generated in the light emitting layer 14C. The transparent electrode 15B having transparency is laminated in this order from the organic layer 14 side. As a result, in the drive panel 10, the light generated in the light emitting layer 14C is extracted from the cathode 15 side, as indicated by the dashed arrow in FIGS.

The semi-transparent electrode 15A has, for example, a thickness of 1
It is about 0 nm, and is composed of an alloy of Mg (Mg) and silver (MgAg alloy). The semi-transparent electrode 15A is for reflecting the light generated in the light emitting layer 14C between itself and the anode 12. That is, the semi-transmissive electrode 15A and the anode 12 form a resonance portion of a resonator that resonates the light generated in the light emitting layer 14C. If the resonator is configured in this way, the light generated in the light emitting layer 14C causes multiple interference and acts as a kind of narrow band filter, whereby the half width of the spectrum of the extracted light is reduced, and It is preferable because the purity can be improved. In addition, external light incident from the sealing panel 20 can also be attenuated by multiple interference, and in combination with a color filter 22 (see FIG. 1) described later, reflection of external light on the organic electroluminescent elements 10R, 10G, 10B. It is preferable because the rate can be made extremely small.

For that purpose, it is preferable to make the peak wavelength of the narrow band filter and the peak wavelength of the spectrum of the light to be extracted coincide with each other. That is, the anode 1
2 and the phase shift of the reflected light generated at the semi-transparent electrode 15A is Φ (rad), the optical distance between the anode 12 and the semi-transparent electrode 15A is L, and the peak of the spectrum of the light to be extracted from the cathode 15 side. When the wavelength is λ, it is preferable that the optical distance L satisfies the expression (2), and actually, the optical distance L is preferably selected so as to have the minimum positive value that satisfies the expression (2). In Equation 2, L and λ may have a common unit, but for example, (nm) is a unit.

[0023]

2 L / λ + Φ / 2π = q (q is an integer)

The transparent electrode 15B is for reducing the electric resistance of the semi-transparent electrode 15A, and is made of a conductive material having a sufficient translucency for the light generated in the light emitting layer 14C. As a material forming the transparent electrode 15B, for example, a compound containing indium, zinc (Zn) and oxygen is preferable. This is because good conductivity can be obtained even when the film is formed at room temperature. The transparent electrode 15B preferably has a thickness of, for example, about 200 nm.

The sealing panel 20, as shown in FIG.
The sealing substrate 21 is located on the cathode 15 side of the drive panel 10 and seals the organic electroluminescent elements 10R, 10G, and 10B together with the adhesive layer 30. Substrate 21 for sealing
Is made of a material such as glass that is transparent to the light generated in the organic electroluminescent elements 10R, 10G, and 10B. The sealing substrate 21 includes, for example, a color filter 22 and a reflected light absorbing film 2 as a black matrix.
3 are provided, and the organic electroluminescent elements 10R and 10R are provided.
The light generated in G and 10B is taken out, and the external light reflected by the organic electroluminescent elements 10R, 10G, and 10B and the anode 12 and the cathode 15 positioned as wiring between them is absorbed to improve the contrast. There is.

The color filter 22 and the reflected light absorbing film 23 may be provided on either side of the sealing substrate 21, but it is preferably provided on the drive panel 10 side. Color filter 22 and reflected light absorption film 2
This is because 3 is not exposed on the surface and can be protected by the adhesive layer 30. The color filter 22 includes a red filter 22R, a green filter 22G and a blue filter 22B, and the organic electroluminescent elements 10R, 1R
They are arranged in order corresponding to 0G and 10B.

FIG. 4 shows a plan configuration of the color filter 22 as seen from the drive panel 10 side. In addition, in FIG. 4, the red filter 22R and the green filter 22G are shown.
In order to easily identify the blue filter 22B and the blue filter 22B, a vertical line is attached to the red filter 22R, a diagonal line is attached to the green filter 22G, and a horizontal line is attached to the blue filter 22B.

Red filter 22R, green filter 2
The 2G and blue filters 22B each have, for example, 5
It is formed in a rectangular shape without any gap, and its dimensions are, for example, a width D1 of 174 μm and a width D2 of 165.5 μm.
It has become m. The red filter 22R, the green filter 22G and the blue filter 22B are each made of a resin mixed with a pigment, and by selecting a pigment, the light transmittance in the target red, green or blue wavelength range is high, It is adjusted so that the light transmittance in other wavelength regions is low.

The color filter 22 is 300 n
It is preferable to have an ultraviolet ray transmitting region having a light transmittance of 10% or more in at least a part of the wavelength region of m or more and 430 nm or less. This is because ultraviolet rays are transmitted from the sealing panel 20 side so that the drive panel 10 and the sealing panel 20 can be easily bonded to each other with the adhesive layer 30 made of an ultraviolet curable resin. For example, for the red filter 22R and the blue filter 22B,
300 nm or more and 430 nm or more by selecting the material
It is possible to set the light transmittance in at least a part of the following wavelength range to 10% or more, whereby the entire region is set as the ultraviolet ray transmission region.

On the other hand, it is difficult for the green filter 22G to have a light transmittance of 10% or more in at least a part of the wavelength range of 300 nm or more and 430 nm or less depending on the selection of the material. The transmittance is smaller than 10%. Therefore, the green filter 22G is partially provided with an opening 22G1 for increasing the transmittance of ultraviolet rays, for example.

If the opening 22G1 is too large, the original function of the filter will be impaired, so it is preferable that the opening 22G1 be as small as possible. For example, one side has a square shape with a length of about 10 μm. In addition, the peripheral portion 22 of the opening 22G1
For example, as shown in FIG. 1, G2 has a small thickness due to the inclination (taper) generated in the manufacturing process, and thus it is easy to transmit light. That is, this green filter 22G
Then, the opening 22G1 and the peripheral portion 22G2 thereof function as an ultraviolet ray transmitting region, and the ultraviolet ray transmitting region is, for example, a square having a side length of about 35 μm.

The shape of the opening 22G1 does not have to be square, and may be any shape such as circular, elliptical or rectangular. Further, the opening 22G1 does not necessarily have to be provided, and the ultraviolet light transmitting region may be configured only by reducing the thickness of the green filter 22G.

As shown in FIGS. 1 and 4, the reflected light absorbing film 23 includes a red filter 22R and a green filter 2.
It is provided along the boundary between the 2G and blue filters 22B. The reflected light absorbing film 23 is formed of, for example, a black resin film having a black colorant mixed therein and an optical density of 1 or more, or a thin film filter that utilizes thin film interference. Of these, the black resin film is preferable because it can be easily formed at low cost.
The thin film filter is one in which one or more thin films made of metal, metal nitride, or metal oxide are laminated, and light is attenuated by utilizing interference of the thin films. As the thin film filter, specifically, chromium and chromium (III) oxide
(Cr ₂ O ₃ ) may be alternately laminated.

As shown in FIG. 1, the adhesive layer 30 is used for the organic electroluminescent devices 10R, 10G, 10B of the driving panel 10.
By covering the entire surface on the side where is provided, the organic electroluminescent elements 10R, 10G, and 10B are more effectively prevented from being corroded and damaged. However, the adhesive layer 30
Is not necessarily provided on the entire surface of the drive panel 10, and at least the organic electroluminescent elements 10R and 10R are provided.
It may be provided so as to cover G and 10B.

This display device can be manufactured, for example, as follows.

5 to 8 show a method of manufacturing this display device in the order of steps. First, as shown in FIG. 5A, for example, the sealing substrate 21 made of the above-mentioned material.
A reflection light absorption film 23 made of the above-mentioned material is formed on the above, and patterned into a shape as shown in FIG. Next, as shown in FIG. 5B, the material of the red filter 22R is applied onto the sealing substrate 21 by spin coating or the like, patterned by a photolithography technique, and baked to form the red filter 22R. Form. At the time of patterning, it is preferable that the peripheral edge portion of the red filter 22R covers the reflected light absorbing film 23.
This is because it is difficult to perform patterning with high precision so as not to cover the reflected light absorbing film 23, and the portion overlapping the reflected light absorbing film 23 does not affect image display. Then, as shown in FIG. 5C, the red filter 22
Similarly to R, the blue filter 22B and the green filter 22G are sequentially formed. Thereby, the sealing panel 20 is formed.

Further, as shown in FIG. 6A, a plurality of anodes 12 made of the above-mentioned material are formed in parallel on the driving substrate 11 made of the above-mentioned material, for example, by DC sputtering. . Next, the insulating layer 13 is formed on the anode 12 by, for example, a CVD (Chemical Vapor Deposition) method to have the above-described thickness, and a portion corresponding to a light emitting region is selectively formed by using, for example, a lithography technique. Then, the opening 13A is formed.

Subsequently, as shown in FIG. 6B, hole injection of the above-described thickness and material is performed corresponding to the opening 13A of the insulating layer 13 by using an area mask (not shown) by, for example, vapor deposition. The layer 14A, the hole transport layer 14B, the light emitting layer 14C, and the electron transport layer 14D are sequentially formed. At this time, the area mask used by the organic electroluminescent elements 10R, 10G, and 10B is changed to change the organic electroluminescent elements 10R and 1R.
A film is formed every 0 G and 10 B. Further, since it is difficult to deposit the vapor only on the opening 13A with high precision, the opening 13A
It is preferable to form the film so as to cover the entire surface and slightly cover the edge of the insulating layer 13. After forming the organic layer 14, a plurality of semi-transparent electrodes 15A having the above-mentioned thickness and material are formed by using an area mask (not shown) by, for example, an evaporation method.
It is formed in parallel in a direction perpendicular to the anode 12. After that, the transparent electrode 15B is formed on the semi-transparent electrode 15A by, for example, DC sputtering using the same area mask as that of the semi-transparent electrode 15A. As a result, the drive panel 10 is formed.

After forming the sealing panel 20 and the driving panel 10, as shown in FIG. 6C, the driving substrate 1 is formed.
An adhesive layer 30 made of an ultraviolet curable resin is applied and formed on the side on which the first organic electroluminescent element 10R, 10G, 10B is formed. The application may be performed, for example, by ejecting an ultraviolet curable resin from a slit nozzle type dispenser, or may be performed by roll coating or screen printing. Then, as shown in FIG. 7A, the drive panel 10 and the sealing panel 20 are bonded to each other with the adhesive layer 3
Stick through 0. At this time, it is preferable that the surface of the sealing panel 20 on the side where the color filter 22 and the reflected light absorbing film 23 are formed faces the drive panel 10. Further, it is preferable that air bubbles and the like are not mixed in the adhesive layer 30.

Subsequently, as shown in FIG. 7B, for example, the sealing panel 20 is moved as indicated by an arrow to match the relative positions of the sealing panel 20 and the drive panel 10. That is, the organic electroluminescent elements 10R, 1
The positions of 0G and 10B and the color filter 22 are matched. At this time, the adhesive layer 30 is still uncured, and the relative position between the sealing panel 20 and the drive panel 10 can be moved by about several hundred μm.

Finally, as shown in FIG. 8, from the sealing panel 20 side, for example, the wavelength is 300 nm or more and 430 nm.
The following ultraviolet rays UV are irradiated. In the red filter 22R and the blue filter 22B, for example, the light transmittance in at least a part of this wavelength range is set to 10% or more. Therefore, the ultraviolet UV transmits the red filter 22R and the blue filter 22B in the light transmittance of 10% or more. To penetrate. Thereby, the red filter 22 of the adhesive layer 30
The area corresponding to the R and blue filters 22B is hardened, and the surrounding area of about 100 μm is hardened due to the wraparound of light due to interference.

In the green filter 22G, the opening 2
Since the ultraviolet ray transmitting region composed of 2G1 and its peripheral portion 22G2 is provided, the ultraviolet ray UV transmits this ultraviolet ray transmitting region with a transmittance of 10% or more. As a result, the region of the adhesive layer 30 corresponding to the ultraviolet ray transmissive region and its periphery within a range of about 100 μm are cured, and further the periphery thereof is cured by the generation and diffusion of cations. In this way, the entire adhesive layer 30 is cured and the drive panel 10 and the sealing panel 20 are adhered to each other.
Through the above steps, the display device shown in FIGS. 1 to 4 is completed.

This display device operates as follows, for example.

In this display device, when a predetermined voltage is applied between the anode 12 and the cathode 15, a current is injected into the light emitting layer 14C and the holes and the electrons are recombined, so that the light emitting layer is mainly emitted. Light emission occurs at the interface on the 14C side. This light is multiply reflected between the anode 12 and the semi-transparent electrode 15A, passes through the cathode 15, the adhesive layer 30, the color filter 22, and the sealing substrate 21, and is extracted from the sealing panel 20 side. . In this embodiment, since the sealing panel 20 is provided with the color filter 22 and the reflected light absorbing film 23, the external light incident from the sealing panel 20 is reflected by the organic electroluminescent elements 10R, 10G, 10B and the like. Of light from the sealing panel 20 and the contrast is improved.

Further, in the present embodiment, since the organic electroluminescent elements 10R, 10G and 10B are provided with the resonator having the semi-transmissive electrode 15A and the anode 12 as the resonator portion,
Due to the multiple interference, the full width at half maximum of the spectrum of the extracted light is reduced, the color purity is improved, the external light is attenuated, and the reflectance of the external light becomes smaller due to the combination with the color filter 22. That is, the contrast is further improved.

As described above, according to the present embodiment, the sealing panel 21 is provided with the color filter 22 and the adhesive layer 30 provided so as to cover the organic electroluminescent elements 10R, 10G and 10B. Since the drive panel 10 and the drive panel 10 are adhered to each other, it is possible to prevent external light incident from the sealing panel 20 from being reflected by the organic electroluminescent elements 10R, 10G, 10B and emitted from the sealing panel 20. it can. Therefore, the contrast can be improved. Further, the organic electroluminescent device 10R,
10G, 10B can be reliably sealed, and the organic electroluminescent elements 10R, 10G, 10B can be effectively prevented from being corroded and damaged. Further, the drive panel 10 and the sealing panel 20 can be easily attached to each other by the adhesive layer 30 made of the ultraviolet curable resin.

In particular, if the color filter 22 has an ultraviolet ray transmitting region, the adhesive layer 30 can be easily cured by irradiating it with ultraviolet light UV from the sealing panel 20 side.

Further, the organic electroluminescent elements 10R, 10G,
If 10B has a resonator having the semi-transmissive electrode 15A and the anode 12 as a resonance part, the light generated in the light emitting layer 14C causes multiple interference and acts as a kind of narrow band filter, thereby extracting light. The full width at half maximum of the spectrum can be reduced, and the color purity can be improved. Further, external light incident from the sealing panel 20 can also be attenuated by multiple interference, and in combination with the color filter 22, the organic electroluminescent elements 10R and 10R.
The reflectance of external light in G and 10B can be made extremely small. Therefore, the contrast can be further improved.

[Second Embodiment] FIG. 9 shows a second embodiment of the present invention.
3 shows a cross-sectional structure of the display device according to the embodiment. This display device includes a drive panel 10 for a sealing substrate 21.
The display device is the same as the display device described in the first embodiment, except that the antireflection film 24 is provided on the surface on the opposite side. Therefore, the same components are designated by the same reference numerals, and detailed description thereof will be omitted.

The antireflection film 24 is for preventing the surface reflection of external light on the sealing substrate 21. When the sealing substrate 21 is made of glass, for example, its surface reflection is about 4%. However, when the reflection of external light inside the display device is suppressed by the color filter 22, the reflected light absorbing film 23, etc., the sealing substrate is This is because the surface reflection at 21 cannot be ignored.

The antireflection film 24 is preferably composed of, for example, a thin film filter in which silicon oxide (SiO ₂ ) and titanium oxide (TiO ₂ ) or niobium oxide (Nb ₂ O ₅ ) are laminated.

As described above, according to this embodiment, in addition to the effect described in the first embodiment, the antireflection film 24 is provided on the sealing substrate 21, so that the sealing substrate 21 is provided. It is possible to reduce the surface reflection of external light in the above step and further improve the contrast.

Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made. For example, in the above embodiment, the red filter 22R and the blue filter 22B are used.
For the green filter 22G, the whole is made to be an ultraviolet light transmitting region by selecting the material, and for the green filter 22G, the opening 22G is used.
Although the ultraviolet ray transmitting region consisting of 1 or the like is provided in part, the red filter 22R and the blue filter 22
Regarding B, as in the case of the green filter 22G, an ultraviolet light transmitting region including an opening may be partially provided.

Further, in the above-described embodiment, the red filter 22R, the green filter 22G, and the blue filter 22B are all provided with the ultraviolet ray transmitting region.
You may make it provide in some of them.

Further, in the above embodiment, the sealing substrate 2 is used.
Although the case where the color filter 22 and the reflected light absorption film 23 are provided in 1 is described, the reflected light absorption film 23 may be provided as necessary, and may not be provided.

In addition, in the above-mentioned embodiment, the structure of the organic electroluminescent elements 10R, 10G and 10B has been specifically described, but it is not necessary to include all layers such as the insulating layer 13 or the transparent electrode 15B. Moreover, you may further provide the other layer. Although the present invention can be applied to the case where the semi-transparent electrode 15A is not provided, as described in the above embodiment, the semi-transparent electrode 15 is used.
By providing a resonator having A and the anode 12 as a resonance part, the reflectance of external light in the organic electroluminescent elements 10R, 10G, and 10B can be reduced, and the contrast can be further improved. Therefore, it is preferable.

Furthermore, in the above embodiment, the first electrode is the anode and the second electrode is the cathode, but the first electrode may be the cathode and the second electrode may be the anode. in this case,
Light comes out from the side of the anode, and the anode is composed of a semitransparent electrode or a transparent electrode.

In addition, in the above embodiment, the materials of the organic layer 14 are changed to generate red, green and blue lights. However, according to the present invention, the color conversion layer (co
The present invention can also be applied to a display device in which these lights are generated by combining lorchanging medias (CCM) or a color filter.

[0059]

As described above, according to the display device of any one of claims 1 to 11, a color filter is provided on the sealing substrate so as to cover the organic electroluminescent element. Since the sealing panel and the driving panel are adhered by the adhesive layer, it is possible to prevent external light entering from the sealing panel from being reflected by the organic electroluminescent device and emitted from the sealing panel. it can. Therefore, the contrast can be improved. Moreover, the organic electroluminescent element can be reliably sealed by the adhesive layer, and the corrosion and damage of the organic electroluminescent element can be effectively prevented. Further, the drive panel and the sealing panel can be easily attached to each other by the adhesive layer made of the ultraviolet curable resin.

Particularly, according to the display device of the second aspect,
Since the color filter has the ultraviolet ray transmitting region, it is possible to easily cure the adhesive layer by irradiating it with ultraviolet light from the sealing panel side.

According to the display device of the ninth aspect,
Since the antireflection film is provided on the sealing substrate, the surface reflection of external light on the sealing substrate can be reduced, and the contrast can be further improved.

Further, according to the display device of the tenth or eleventh aspect, since the semi-transmissive electrode and the first electrode constitute the resonance part of the resonator, the light generated in the light emitting layer is prevented. By causing multiple interference and acting as a kind of narrow band filter, the half width of the spectrum of the extracted light can be reduced and the color purity can be improved. In addition, external light incident from the sealing panel can also be attenuated by multiple interference, and by combining with a color filter, the reflectance of external light in the organic electroluminescent element can be made extremely small. Therefore, the contrast can be further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an enlarged configuration of an organic electroluminescent element in the display device shown in FIG.

3 is a cross-sectional view showing an enlarged configuration of an organic electroluminescent element in the display device shown in FIG.

4 is a plan view showing a configuration of a color filter in the display device shown in FIG. 1 as seen from a driving panel side.

5A to 5C are cross-sectional views showing a method of manufacturing the display device shown in FIG. 1 in process order.

FIG. 6 is a cross-sectional view showing a process following on the process shown in FIG.

FIG. 7 is a cross-sectional view showing a process following on the process shown in FIG.

FIG. 8 is a cross-sectional view showing a process following on the process shown in FIG.

FIG. 9 is a cross-sectional view showing a configuration of a display device according to a second embodiment of the present invention.

[Explanation of symbols]

10 ... Driving panel, 10R, 10G, 10B ... Organic electroluminescent element, 11 ... Driving substrate, 12 ... Anode (first electrode), 13 ... Insulating layer, 13A ... Opening part, 14 ... Organic layer,
14A ... hole injection layer, 14B ... hole transport layer, 14C ... light emitting layer, 14D ... electron transport layer, 15 ... cathode (second electrode),
15A ... semi-transparent electrode, 15B ... transparent electrode, 20 ... sealing panel, 21 ... sealing substrate, 22 ... color filter,
22R ... red filter, 22G ... green filter, 2
2G1 ... Aperture, 22G2 ... Peripheral part, 22B ... Blue filter, 23 ... Reflected light absorption film, 24 ... Antireflection film, 30 ...
Adhesive layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05B 33/02 H05B 33/02 33/12 33/12 E 33/14 33/14 A 33/24 33 / 24 (72) Inventor Tatsuya Sasaoka 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 3K007 AB04 AB11 AB17 AB18 BA06 BB01 BB02 BB06 CB01 DA01 DB03 EA01 EA04 EB00 FA02 5C094 AA06 AA08 AA11 AA31 AA43 BA27 CA19 CA24 DA07 DA12 DA13 EA05 EA06 EB02 ED03 ED12 FA01 FA02 FB01 FB15 FB20 GB10 JA01 JA11 5G435 AA02 AA04 AA13 AA14 AA17 BB05 CC09 CC12 FF03 FF14 GG12 HH01 HH14 HH20 KK

Claims (11)

[Claims] 1. A drive substrate having a plurality of organic electroluminescent elements in which a first electrode, one or more organic layers including a light emitting layer, and a second electrode are sequentially stacked, and light generated in the light emitting layer is provided. A drive panel that takes out from the side of the second electrode, a sealing panel that is arranged facing the second electrode of the drive panel, and a color filter is provided on the sealing substrate, and the sealing panel and the drive A display device, which is provided between the panel and the organic electroluminescence device so as to cover the organic electroluminescence device, and an adhesive layer made of an ultraviolet curable resin. 2. The display device according to claim 1, wherein the color filter has an ultraviolet ray transmitting region having a light transmittance of 10% or more in at least a part of a wavelength region of 300 nm or more and 430 nm or less. 3. The color filter has a red filter, a green filter and a blue filter, and the red filter and the blue filter have a light transmittance of 10% or more in at least a part of the wavelength range. The display device according to claim 2, wherein: 4. The color filter includes a red filter, a green filter and a blue filter, and the green filter has a light transmittance of 10% in the wavelength range.
3. The display device according to claim 2, wherein the display device is smaller than the above and partially has the ultraviolet light transmitting region. 5. The display device according to claim 1, wherein the color filter is provided on the side of the drive panel of the sealing substrate. 6. The display device according to claim 1, wherein the sealing panel has a reflected light absorbing film provided on the sealing substrate. 7. The display device according to claim 6, wherein the reflected light absorbing film is constituted by a black resin film having an optical density of 1 or more, or a thin film filter utilizing interference of thin films. 8. The display device according to claim 6, wherein the reflected light absorbing film is provided on the driving panel side of the sealing substrate. 9. The display device according to claim 1, wherein the sealing panel has an antireflection film provided on the opposite side of the sealing substrate from the drive panel. 10. The second electrode has a semi-transmissive electrode that is semi-transmissive to the light generated in the light-emitting layer, and the semi-transmissive electrode and the first electrode are formed in the light-emitting layer. 2. The display device according to claim 1, which constitutes a resonance portion of a resonator that resonates the generated light. 11. A phase shift of reflected light generated at the first electrode and the semi-transparent electrode is Φ, an optical distance between the first electrode and the semi-transparent electrode is L, and a second electrode of the second electrode is 11. The display device according to claim 10, wherein the optical distance L is a positive minimum value that satisfies Expression 1, where λ is a peak wavelength of a spectrum of light extracted from the side. ## EQU1 ## 2L / λ + Φ / 2π = q (q is an integer)