JP2003115382A - Electroluminescence element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the displaying by the color in an organic EL display possible by forming a color filter on a positive electrode. SOLUTION: It has a 1st transparent substrate 11, a negative electrode 12 formed on the 1st transparent substrate 11, a light emitting substance 14, which consists of an organic material, formed on the negative electrode 12, a positive electrode 15 formed on the light emitting substance 14, color filters 17R, 17G, and 17B formed on the positive electrode 15, and a seal material 16, which pastes up the 1st transparent substrate 11 and the 2nd transparent substrate 12 so that the sealing of the 2nd transparent substrate 12, which is arranged to counter the 1st transparent substrate 11 and becomes to an image displaying surface, and at least the light emitting substance 14 may be sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL display (Electroluminescent Display), and more particularly to a structure that enables color display of an organic EL display. In recent years, a display using an organic EL has been attracting attention as a flat display panel instead of a liquid crystal display or the like.

Since an organic EL display can be driven by a direct current voltage, a driving circuit can be simple and has no viewing angle dependency like a liquid crystal display device, and it is bright because it self-luminesces. Furthermore, since it has many advantages such as a response speed which is considerably faster than that of a liquid crystal display device, it is expected as a flat display panel in the future.

[0003]

2. Description of the Related Art An organic EL display according to a conventional example will be described below with reference to the drawings. Note that FIG.
[Fig. 3] is a top view for explaining the structure of the organic EL display according to the present embodiment, and Fig. 3 is a sectional view taken along the line AA of Fig. 4. As shown in FIGS. 3 and 4, this is the first and second transparent substrates (1, 2) made of glass, the cathode (3) made of MgIn, etc., and the white light emitting body (4) made of organic EL, etc. , I
It is composed of an anode (5) made of a TO film or the like and a sealing material (6) made of a low temperature curable epoxy resin or a UV curable resin. Note that the white light-emitting body (4) is omitted in FIG.

A cathode (3) is provided on the first transparent substrate (1).
Are arranged in stripes, and a white light emitting body (4) is formed on the cathode (3) in the display area. A cathode (3) and an anode (5) arranged so as to be orthogonal to the white light emitting body (4) are formed on the white light emitting body (4).
These are arranged in a matrix. The second transparent substrate (2) is arranged on the first transparent substrate (1) so as to face each other, and both are adhered to each other with a sealing material (6).

To display an image on this display,
A DC voltage is applied between the anode (5) and the cathode (3) in the region to emit light. Then, electrons are injected into the white light-emitting body (4) where a DC voltage is applied and an electric field is generated, so that the white light-emitting body emits light, and a monochromatic (white) image is displayed on the second transparent substrate (2) side which is the display surface. Can be displayed.

[0006]

In the structure of the above device,
Only white monochrome images can be displayed. In order to meet the recent demand for colorization of flat display panels, there has been an increasing demand for color display in the organic EL display.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and includes a first transparent substrate, a cathode formed on the first transparent substrate, and a cathode formed on the cathode. A light-emitting body made of the organic material, an anode formed on the light-emitting body, a color filter formed on the anode, a second transparent substrate arranged to face the first transparent substrate, The above problem is solved by an organic EL display characterized by having a sealing material that adheres the first transparent substrate and the second transparent substrate so as to seal the light emitting body.

[0008]

DETAILED DESCRIPTION OF THE INVENTION Organic EL displays according to embodiments of the present invention will be described below with reference to the drawings. 2 is a top view illustrating the structure of the organic EL display according to the present embodiment, and FIG.
It is a X-ray sectional view. This display is
As shown in FIG. 1, first and second transparent substrates (11, 12) made of glass, a cathode (13) made of MgIn, a white light-emitting body (14) made of organic EL, an anode made of ITO film ( 15), a sealant (16), and color filters (17R, 17G, 17B) exhibiting red (R), green (G), and B (blue), respectively. The white light-emitting body (14) is not shown in FIG.

On the first transparent substrate (11), the cathode (1
3) are arranged in stripes, and the cathode (1
A white luminescent material (14) is formed on 3). Further, on the white light emitting body (14), the cathode (13) and the anode (15) arranged so as to be orthogonal to the white light emitting body (14).
Are formed, and these are arranged in a matrix. Color filters (17R, 17G, 17B) are formed on the anode (15) by an electrodeposition method.

On the first transparent substrate (11), the second transparent substrate (12) is arranged so as to face each other, and both of them are sealing materials (1
Bonded in 6). In order to display an image on this display, a direct current voltage is applied between the anode (15) and the cathode (13) in the region to emit light. Then, the white light-emitting body (1
When it is injected into 4), it emits light, and an image can be displayed on the side of the second transparent substrate (12) which is the image display surface. At this time, since the color filters (17R, 17G, 17B) are formed on the anode (15), color display can be performed.

Although a similar structure can be seen in a liquid crystal display device, in the case of a liquid crystal display device, a color filter is formed by a direct electrodeposition method on a transparent electrode made of an ITO film for applying a driving voltage to liquid crystal. Since the thickness of the color filter leads to the loss of the electric field and affects the display contrast, the ITO film for the electrodeposition color filter, the ITO film for the display transparent electrode, and the ITO film are separately prepared to form a two-layer structure. Had to do.

However, when the present invention is applied to an organic EL display, color filters (17R, 17G,
17B) can be directly formed on the anode (15) made of an ITO film by the electrodeposition method, so that the ITO film for electrodeposition and the anode are shared. Therefore, unlike the liquid crystal display device, it is not necessary to separately prepare an ITO film for electrodeposition,
There are merits such as a reduction in the number of processes, simplification of manufacturing, and cost reduction.

In this embodiment, the white light-emitting body (1
Although 4) is described as a single layer, a structure in which an electron transporting layer, a hole transporting layer or the like is formed may be adopted for the purpose of efficiently injecting carriers onto this light emitting body.

[0014]

As described above, the organic E according to the present invention
According to the L display, since the color filter is formed on the anode, it is possible to perform color display in the organic EL display. Further, according to the present invention,
A color filter is formed on the ITO film by the electrodeposition method,
Since the ITO film for the color filter, the ITO film for the transparent electrode, and the ITO film need to be separately prepared to have a two-layer structure, they can be directly formed on the anode. There is no need to separately prepare an ITO film, and there are advantages that the number of steps is reduced, the manufacturing is simple and the cost is low, as compared with a liquid crystal display device having a similar structure.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating an organic EL display according to an embodiment of the present invention.

FIG. 2 is a top view illustrating an organic EL display according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating the structure of an organic EL display according to a conventional example.

FIG. 4 is a top view illustrating an organic EL display according to a conventional example.

[Explanation of symbols]

(11) First transparent substrate (12) Second transparent substrate (13) Cathode (14) White light emitter (light emitter) (15) Anode (16) Seal material (17R) Color filter (17G) Color filter (17B) Color filter

Claims (4)

[Claims] 1. A cathode formed on a substrate, a light emitting body made of an organic material formed on the cathode, an anode formed on the light emitting body, and a color filter formed on the anode. An electroluminescent device having: 2. A first electrode formed on a first substrate, a light emitting body made of an organic material formed on the first electrode, and a second electrode formed on the light emitting body. And a color filter formed on the second electrode, wherein the first electrode, the light emitter and the second electrode are provided on the first substrate and the first substrate. An electroluminescence device, which is arranged between a second substrate and a second substrate which face each other, wherein light emitted from the light emitting body is output to the second substrate side through the second electrode and the color filter. 3. A light-emitting body made of an organic material is arranged between electrodes facing each other, one electrode is arranged on a substrate, and a color filter is arranged on the other electrode. An electroluminescent element, wherein light emission is output through the other electrode and the color filter. 4. The electroluminescent element according to claim 1, wherein the color filter is formed by an electrodeposition method.