JP2000089689A - Color electroluminescence display device and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bond two substrates to each other while preventing the failure of these substrates. SOLUTION: The color EL display device 1 of a filter system includes a panel member 3 and a filter side member 4. The panel member 3 is completed by forming plural EL elements 33 on one surface 31 of the main substrate 5 and forming sealing parts 7 on the one surface 31 after element formation, then forming a recessed part 37 on the other surface 37 of the main substrate 5 after the formation of these sealing parts. The filter side member 4 is completed by further forming a filter part 8 on the one surface 51 of the counter substrate 9. The upper electrodes 15 in the EL elements 33 include magnetic materials. After the completion of the two members 3, 4, a transparent adhesive prior to curing is interposed between the base surface 38 of the recessed part 37 and the filter part 8. Magnetic force sources 57 are arranged in the positions facing the upper electrodes 15 via the substrates 5, 9 and after the adhesive is interposed in this state, magnetic force of the predetermined intensity is generated between these magnetic force sources 7 and the upper electrodes 15 before the adhesive cures. As a result, the two members 3, 4 are bonded without the failure thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter type color electroluminescent display device constituted by a combination of an electroluminescent element and a color filter, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Electroluminescence (Electrolum)
The display device is a thin display device capable of matrix display. The EL display device is generally configured by arranging a plurality of EL elements on a substrate. Is done. Each of the EL elements is formed by interposing an EL light emitting layer between a pair of electrodes, and functions as a pixel of the EL display device. When an AC voltage is applied between the pair of electrodes, the EL light emitting layer emits electroluminescence (Electr
oluminescence), and as a result, light is emitted from the EL light emitting layer.

As a conventional EL display device capable of monochrome display, a so-called yellow monochrome thin film EL panel has been put to practical use. The conventional monochrome EL display device includes:
The electrode closer to the substrate of the pair of electrodes, that is, the lower electrode is a thin film piece made of a transparent conductive material, and the electrode farther from the substrate of the pair of electrodes, that is, the so-called upper electrode is a metal material. And a light-reflective thin-film piece comprising:
This is a thin film piece made of Mn. As a result, light emitted from the EL light emitting layer is emitted outside the EL display device after passing through the lower electrode and the substrate.

[0004] In recent years, with the development of the so-called information industry, the demand for thin display devices capable of color display has been increasing.
For this reason, a filter type color EL display device is being developed as an EL display device capable of color display. A filter-type EL display device separates light of a single color emitted from a plurality of EL elements by a plurality of color filters capable of passing only light of a predetermined color wavelength, and forms a plurality of colors of light. Get. In the filter type color EL display device, the wavelengths of light emitted from the light emitting layers of all the EL elements can be made equal to each other, so that the light emitting layers of all the EL elements have the same structure. it can. As a result, the color EL display device
The manufacturing process of the L element is relatively simple.

[0005] In such a color EL display device of the filter type, there is a problem in that the viewing angle depends on the gap between the EL element and the color filter, that is, the so-called color shift occurs. In order to eliminate the viewing angle dependency, a conventional color EL display device of a filter type does not interpose anything between an EL element and a color filter, and
The element and the color filter are brought as close as possible.

[0006] The color EL display device having the above-described structure includes:
When the EL element and the color filter are aligned during the manufacturing process, the EL element and the color filter may come into contact with each other and cause damage. Also, since the EL element has a property of repeatedly expanding and contracting in the thickness direction of the EL element when an AC voltage is applied, the EL element and the color filter may partially contact during use of the color EL display device. There is. Thereby, the color EL display device
Pixel defects due to so-called insulation breakdown and linear defects due to disconnection breakdown of the electrode may occur. In order to solve the above two problems, the present applicant has proposed the following first and second filter type color EL display devices.

In the first color EL display device, a plurality of EL elements are arranged on one surface of a first substrate having a light-transmitting property, and a color filter is arranged on one surface of a second substrate having a light-transmitting property. The second substrate is attached to the other surface of the first substrate via the color filter. Further, the first substrate is thicker than a predetermined reference thickness at the time of manufacturing the EL element, and after the EL element is manufactured, prior to the attachment of the second substrate, the other surface of the first substrate has a thickness of the first substrate. Etching is performed until the reference thickness is reached. The first color E
The L display device includes the first substrate and the EL in the device.
Since the structure of the member including the element is substantially the same as the structure of the conventional monochrome EL display device,
The display device has features such as a long life, a high-speed response, and a wide operating temperature range, and thus has high reliability.

In the second color EL display device, a plurality of EL elements are disposed on one surface of a first substrate, a color filter is disposed on one surface of a transparent second substrate, and one surface of the first substrate is disposed. Through the EL element and the color filter.
A substrate is adhered, and a spacer is interposed between the EL element and the color filter. Since the spacer can be easily dispersed between the EL element and the color filter, the manufacture of the second color EL display device is easy.

Japanese Patent Application Laid-Open No. 5-230618 discloses a technique for ensuring that a mask adheres to a substrate member to be processed when performing so-called photoetching.
The mask for forming a thin film pattern disclosed in the above publication is formed of a magnetic material and magnetized in advance. The substrate member to be processed has at least one thin film layer disposed on a substrate, and the substrate or at least one thin film layer is formed of a magnetic material. As a result, the mask is securely adhered to the surface of the substrate member by the magnetic force.

[0010]

The first color E described above is used.
In the L display device, the thickness of the etched portion in the first substrate at the time of bonding the first and second substrates in the device is larger than the thickness of the portion in manufacturing the EL element of the first substrate. Also thin. Therefore, the mechanical strength of the portion of the first substrate at the time of bonding is lower than the strength of the portion at the time of manufacturing the EL element. As a result, at the time of bonding, the portion of the first substrate is soft and easily broken, that is, the portion is easily distorted and bent, so that the first and second substrates are hard to adhere to each other, and between the first and second substrates. It is easy to create a gap. As a result, the distance between the first and second substrates is widened and the viewing angle of the color EL display device is narrowed, color misregistration due to distortion of the first substrate is generated, and the deflection of the first substrate is caused. The resulting pattern may appear. As a result, the display quality of the color EL display device tends to deteriorate. In addition, when the first and second substrates are pressed by hand or mechanically held down by a jig in order to bring the two substrates into close contact with each other at the time of bonding, the portion of the first substrate is extremely thin. Therefore, the portion of the first substrate may be broken. As a result, the yield of the color EL display device deteriorates.

In the above-described second color EL display device, the larger the size of the first and second substrates, the more the first and second substrates are manufactured during the manufacture of the color EL display device.
The substrate is likely to be warped, bent, or distorted. Due to these, the interval between the first and second substrates may be larger than the interval defined by the spacer. As a result, the second color E
The viewing angle of the L display device becomes narrow. Also, the second color EL
During the manufacture of the display device, the first and second substrates are pressed by hand when the first and second substrates are bonded together so that the distance between the first and second substrates is set to a distance defined by a spacer. Or it may be suppressed mechanically with a jig. In this case, the force for holding down the substrate in the first and second substrates may be locally concentrated.
The substrate may crack and chip. As a result, the yield of the color EL display device deteriorates.

The above two types of color EL display devices have a first substrate member composed of a first substrate and an EL element, and a second substrate member composed of a second substrate and a color filter. Only the first substrate member includes a layer formed of a material containing a magnetic material, for example, an electrode in an EL element. The first
And when the second substrate member is bonded,
In the case of using the technology disclosed in Japanese Patent No. 230618, if the magnetic layer in the first substrate member is magnetized, there is no magnetic layer in the second substrate member. It is difficult to be done.

An object of the present invention is to prevent the yield from being deteriorated due to cracking and chipping of two substrates in the color EL display device during the manufacturing process of the color EL display device, The present invention relates to a color EL display device for preventing deterioration of display quality due to an increase in a gap between an EL element and a color filter in an EL display device, and a method for manufacturing the same.

[0014]

According to a first aspect of the present invention, there is provided a process for forming a plurality of electroluminescent elements each having an electroluminescent light emitting layer interposed between a pair of electrodes on one surface of a first substrate. Forming a plurality of color filters on one surface of a light-transmitting second substrate through which light having a predetermined wavelength can pass;
And the second substrate is opposed to at least the color filter, and with an adhesive layer before curing interposed,
Arranging the first and second substrates from a first point in time after the first and second substrates are arranged to a second point in time when the adhesive layer is cured, by applying a predetermined magnetic force to the first and second substrates; Generating a magnetic force for applying a force acting in a direction in which the first and second substrates come closer to each other.

According to the first invention, in the color EL display device manufactured by the above-described manufacturing method, the first and second substrates are bonded by a magnetic force from the magnetic force source. Thus, the first and second substrates are bonded together with a predetermined positional relationship without an extra gap larger than a predetermined gap. As a result, in the completed color EL display device, the viewing angle of the color EL display device is reduced due to the increase in the gap between the EL element and the color filter, and the first angle in the color EL display device is reduced. It is possible to prevent the occurrence of color shift due to the distortion of the substrate and the occurrence of the pattern due to the deflection of the first substrate, respectively. Further, control of a force acting on the first and second substrates due to the magnetic force is easier than control of a force mechanically applied to the first and second substrates. Based on these, it is possible to easily prevent the display quality of the color EL display device from deteriorating due to the above-described factors.

According to a second aspect of the invention, there is provided a method for manufacturing a color EL display device, wherein the electroluminescent element contains a magnetic substance.

According to a second aspect, the above-described manufacturing method comprises:
The method according to the first aspect of the present invention is performed under the condition that the EL element contains a magnetic substance. Thus, the magnetic force sufficiently acts on the substrate member including at least the EL element and the first substrate, so that the first and second substrates can be securely bonded without leaving an extra gap. When the EL element does not contain a magnetic substance, it is necessary to sandwich the first and second substrates between a pair of magnetic sources, for example, a magnet and a magnetic plate in order to apply a magnetic force to the first and second substrates. When the EL element includes a magnetic material, in order to apply a magnetic force to the first and second substrates, a single magnetic force source, such as a magnet, is provided at a position opposed to the first substrate with the second substrate interposed therebetween. Should be arranged. As a result, the process for bonding the first and second substrates is simplified, so that the manufacturing cost of the color EL display device can be reduced.

According to a third aspect of the present invention, there is provided a method of manufacturing a color EL display device, wherein one of the pair of electrodes in the electroluminescence element is arranged at a position farther from the first substrate than the electroluminescence light emitting layer. Is characterized by containing a magnetic substance.

According to a third aspect, the above manufacturing method is
The method according to the first aspect of the present invention is performed under the condition that the magnetic substance is contained in the electrode. The electrode is E
In the manufacturing process of the L display element, it is formed after one of the pair of electrodes and the EL light emitting layer are formed. As a result, the magnetic substance contained in the electrode is EL
There is no need to withstand heat treatment during device manufacture. Therefore, a substance capable of strengthening the magnetic force acting on the second substrate can be selected as the magnetic substance irrespective of whether or not it can withstand the heat treatment.

According to a fourth aspect of the present invention, in the method of manufacturing a color EL display device, the magnitude of the magnetic force is set to be equal to the second magnitude from the first time point.
It is characterized in that the first and second substrates have a size capable of maintaining a predetermined interval before the time point.

According to a fourth aspect, in the above-described manufacturing method, the strength of the magnetic force is set as described above. As a result, when the first and second substrates are warped, bent, or distorted during the production of the color EL display device due to an increase in the area of the first and second substrates, Both substrates can be bonded together while maintaining the interval at a predetermined interval. As a result, in this case, it is possible to prevent an extra gap longer than the predetermined interval from being generated in the first and second substrates, so that the viewing angle and display quality of the color EL display device are deteriorated. It can be prevented beforehand.

According to a fifth aspect of the present invention, in the method of manufacturing a color EL display device, the magnetic force acts on the first and second substrates at a plurality of points.

According to a fifth aspect, the above manufacturing method is
In the manufacturing method of the first invention, there are a plurality of points of action of the magnetic force. As a result, in the manufacturing method, if the magnetic force acting on each of the plurality of action points is appropriately adjusted, the first
In addition, the pressure distribution at the time of bonding the second substrate can be appropriately set. As a result, the yield due to cracks in the substrate of the color EL display device manufactured by the manufacturing method is improved. Further, in the manufacturing method, by appropriately setting the timing at which the magnetic force is applied to each of the plurality of action points, for example, when bubbles are mixed in the adhesive layer before curing, the bubbles can be extruded. it can.

According to a sixth aspect of the present invention, in the method of manufacturing a color EL display device, the adhesive layer is formed in a space between the first and second substrates, at least in a portion where the color filter and the electroluminescent element face each other. Is disposed over the entire pixel region, and the refractive index of the adhesive layer after curing is
It is characterized by being equal to the refractive index of at least one of the first and second substrates.

According to a sixth aspect, the above-described manufacturing method is
The method according to the first aspect of the present invention is performed under the condition that the adhesive layer is formed in the above-mentioned shape using the substance having the above-mentioned refractive index. As a result, the manufactured color EL display device can prevent the occurrence of a color shift and a pattern due to a difference in refractive index between the adhesive layer and the at least one substrate. As a result, the display quality of the color EL display device is prevented from deteriorating.

According to a seventh aspect of the present invention, in the method for manufacturing a color EL display device, at least the color filter and the electroluminescent element face each other in a space between the first and second substrates after the adhesive layer is cured. The method further includes a step of sealing a liquid having a refractive index equal to the refractive index of at least one of the first and second substrates in the entire pixel region as a portion.

According to a seventh aspect, the above-described manufacturing method includes:
The method includes the above-described liquid enclosing step in addition to the manufacturing method of the first invention. As a result, the manufactured color EL display device can prevent the occurrence of a color shift and a pattern due to a difference in the refractive index between the liquid layer and the at least one substrate. As a result, the display quality of the color EL display device is prevented from deteriorating. Also, the liquid is generally easier to spread evenly over a wider area than the adhesive. Therefore, if the area of the first and second substrates is large, and it is difficult to spread the adhesive evenly over the pixel area, by sealing the liquid in the pixel area instead of the adhesive,
The manufacturing process of the color EL display device can be simplified while preventing the display quality from deteriorating due to the difference in the refractive index.

According to an eighth aspect of the present invention, there is provided a first substrate, a second substrate having a light transmitting property, and an electroluminescent light emitting layer interposed between a pair of electrodes disposed on one surface of the first substrate. A plurality of electroluminescent elements configured, and a plurality of color filters disposed on one surface of the second substrate and capable of passing light of a predetermined wavelength,
An adhesive layer interposed between the first and second substrates opposed to each other with the color filter interposed therebetween, and the adhesive layer is cured from a point in time after the first and second substrates are opposed to each other. A color electroluminescent display characterized by generating a magnetic force for applying a force acting on said first and second substrates in a direction in which said first and second substrates approach each other, up to a point in time. Device.

According to an eighth aspect of the present invention, in the above-described color EL display device, the first and second substrates are bonded together by a magnetic force from the magnetic force source. The color EL display device is prevented from deteriorating the display quality for the same reason as described in the first invention. Note that the color EL display device may further include the configuration described in the second to seventh inventions.

[0030]

FIG. 1 is a sectional view of a color EL display device 1 manufactured by a method for manufacturing a color EL display device according to a first embodiment of the present invention. FIG. 2 is a plan view of the color EL display device 1. 1 and 2 will be described together.

The color EL display device 1 (hereinafter abbreviated as “display device 1”) includes a panel member 3 and a filter-side member 4. Panel member 3 includes main substrate 5, element portion 6, and seal portion 7. The filter side member 4 includes a filter section 8 and a counter substrate 9. The element section 6 includes a plurality of lower electrodes 11, one lower insulating layer 12, a single light emitting layer 13,
One upper insulating layer 14 and a plurality of upper electrodes 15 are included. The sealing portion 7 includes a sealing substrate 17 and the protective material layer 1.
8 is included. The filter unit 8 includes one or more red filters 21R, one or more green filters 21G, and a light shielding filter 23. Red and green filters 21
R and 21G may be collectively referred to as “color filter 21”.

The main substrate 5 is a substantially plate-shaped member made of a light-transmitting insulating material. The element portion 6 is provided on one surface 3 of the main substrate 5.
1 Each lower electrode 11 and each upper electrode 15
Is a strip-shaped film piece. All lower electrodes 11, lower insulating layer 1
2, light emitting layer 13, upper insulating layer 14, and all upper electrodes 1
Numerals 5 are stacked on one surface 31 of the main substrate 5 in this order from the bottom. All the lower electrodes 11 are arranged in parallel with each other on one surface 31 of the main substrate 5, and each lower electrode 11 has a predetermined width between other lower electrodes 11. , And each is arranged. All the upper electrodes 15 are arranged in parallel with each other on the surface of the upper insulating layer 14, and each upper electrode 15 has a predetermined width between the other upper electrodes 15. Are placed with a gap. The longitudinal direction of each lower electrode 11 and each upper electrode 1
5 is the normal direction 3 of one surface 31 of the main substrate 5.
2, they are orthogonal. That is, the structure of the element section 6 is a so-called simple matrix structure.

In the element section 6, the portions where the lower electrodes 11 and the upper electrodes 15 intersect each other when viewed from the normal direction 32 become the EL elements 33. As a result, all the EL elements 33
Are arranged in a matrix on one surface 31 of the main substrate 5.
Each EL element 33 is a so-called double insulating thin film EL element. When viewed from the normal direction 32 of the main substrate 5, all the E
The region where the L element 33 is arranged is called a pixel region 34.

The conductive material serving as at least one of the lower electrode 11 and the upper electrode 15 is made of a magnetic material in order to use a force caused by a magnetic force when the panel member 3 and the filter-side member 4 described later are bonded. It is preferable to include
In the present embodiment, the conductive material forming upper electrode 15 includes a magnetic substance. Also, the upper electrode 15
It is preferable to be formed of a material having conductivity and capable of reflecting light. When an AC electric field is applied between any of the lower electrodes 11 and any of the upper electrodes 15, the light emitting layer 1
A portion of the electrode 3 between the lower electrode 11 and the upper electrode 15 emits light by electroluminescence. In the present embodiment, the light emitting layer 13 is formed of ZnS to which manganese (Mn) is added (hereinafter, referred to as “ZnS: Mn”), and emits yellow-orange light by electroluminescence.

A recess 37 is formed in the other surface 36 of the main substrate 5. The internal space of the concave portion 37 is, for example, a substantially rectangular parallelepiped, and the bottom surface 38 of the concave portion 37 includes the pixel region 34.
The thickness between the bottom surface 38 of the concave portion 37 and the one surface 31 of the main substrate 5, that is, the thickness of a portion corresponding to the pixel region of the main substrate 5 is a predetermined reference thickness WC. The peripheral portion of the main board 5 keeps the initial thickness WD of the main board 113 and the reference thickness W
Thicker than C. The reference thickness WC is smaller than the thickness of a substrate on which an EL element is formed in a general color EL display device. As will be described later, the concave portion 37 of the main substrate 5
It is not formed during the formation of the seal part 7 and the seal part 7, but is formed after the element part 6 and the seal part 7 are formed.

One surface 41 of the sealing substrate 17 and the main substrate 5
And the peripheral portions of the first surfaces 41 and 31 of the substrates 17 and 5 are bonded together with a sealing adhesive layer 42 interposed therebetween. On one surface 41 of the sealing substrate 17,
A recess 43 is provided. The inner peripheral surface of the concave portion 43 is a rectangular parallelepiped. Further, the sealing substrate 17 is provided with an injection hole 44 communicating with the internal space of the concave portion 43. At least an end of the injection hole 44 on the other surface 45 side of the sealing substrate 17 is sealed by a sealing member 46.

The protective material layer 18 forms a gap between the sealing substrate 17 and the main substrate 5, that is, the internal space of the sealing cell formed by the concave portion 43 of the sealing substrate 17, the sealing adhesive layer 42 and the main substrate 5. Is filled with a protective material. The protective substance is realized by, for example, an insulating liquid. The element section 6 is housed in the internal space of the sealing cell. Therefore, the protective substance covers the surface of the element section 6. The ends of the lower and upper electrodes 11 and 15 serve as terminals of the lower and upper electrodes 11 and 15, respectively.
It is exposed outside the seal part 7. The protective material has a role of protecting the EL element that is vulnerable to moisture.

At least a part of the filter side member 4 is
It is arranged in the concave portion 37 of the main substrate 5. The filter unit 8
It is sandwiched between the bottom surface 38 of the concave portion 37 of the main substrate 5 and one surface 51 of the counter substrate 9. The area of one surface 51 of opposing substrate 9 is smaller than the area of bottom surface 38 of recess 37 of main substrate 5. The filter side member 4 is provided on the bottom surface 3 of the concave portion 37 of the main substrate 5.
It is fixed in the concave portion 37 by a transparent adhesive layer 52 interposed between the filter portion 8 and the filter portion 8. Furthermore, the side adhesive layer 5
3 is interposed between the inner peripheral surface 54 of the concave portion 37 of the main substrate 5 and the side surface 55 of the filter-side member 4. In the present embodiment, when viewed from the normal direction 32 of the main substrate 5, the counter substrate 9 has a larger area than the filter portion 8, and thus the bottom surface 38 of the concave portion 37 of the main substrate 5 has a pixel area. It is wider than 34. As will be described later, when the panel member 3 and the filter-side member 4 are bonded to each other, a magnetic force is used to apply a force for pressing the filter-side member 4 relatively to the panel member 3.

The red and green filters 21R and 21G are
It is a strip-shaped film piece that can only pass light of red and green wavelengths, respectively. One of the lower and upper electrodes 11 and 15 corresponds to each color filter 21 on a one-to-one basis. Each of the color filters 21 is arranged at a position in the bottom surface 38 of the concave portion 37 of the main substrate 5 facing one of the electrodes corresponding to each of the color filters 21 via the main substrate 5. As a result, all the color filters 21 are arranged on the bottom surface 38 of the concave portion 37 of the main substrate 5 in the same arrangement as all the one electrodes, and the longitudinal direction of the color filter 21 is the same as that of the one electrode. Parallel to the longitudinal direction. In the present embodiment, the color filters 21 are arranged in the same arrangement as the upper electrode 15 and in parallel. The light-shielding filter 23 is a so-called black mask, and covers a portion between the color filters 21 in the bottom surface 38 of the concave portion 37 of the main substrate 5. By providing the light-blocking filter 23, the contrast of the display device 1 is improved as compared with a color EL display device without the light-blocking filter 23, and visibility is improved.

Of the above-mentioned parts constituting the display device 1,
At least the main substrate 5, the counter substrate 9, the lower electrode 11, the lower insulating layer 12, and the transparent adhesive layer 52 have translucency. In each of the EL elements 33 having the above-described configuration, the lower electrode 11 is a thin film piece made of a conductive material having a light transmitting property, and the upper electrode is a thin film piece made of a material that reflects light. Of the light emitted from the light emitting layer 13 in each of the EL elements 33, the light emitted to the lower electrode 11 side has two types of color filters 2
Each of the light passes through one of them and is split into red or green light. The light after the spectral separation is the same as the conventional so-called monochrome thin film EL panel member.
The other surface 36 side of the main substrate 5, that is, the concave portion 37 of the main substrate 5
From the bottom surface 38 of the panel member 3. Further, of the light emitted from the light emitting layer 13, the light emitted to the upper electrode 15 side is reflected by the upper electrode 15, passes through the EL element 33, is separated by the color filter 21, and Inject from As a result, the display device 1 uses the other surface 56 of the counter substrate 9 as a display surface, and
A portion where the element 33 and each color filter 21 overlap is defined as a display element, and two adjacent display elements including the red and green color filters 21R and 21G constitute one pixel. With such a configuration, the display device 1 emits so-called multicolor light.

It is preferable that the thickness of the pixel portion of the main substrate 5, that is, the reference thickness WC, is roughly as thin as possible. This is because, in the display device 1, the main substrate 5 has the respective EL elements 33.
And the respective color filters 21, the main substrate 5
As the thickness of the portion corresponding to the pixel region 34 (hereinafter referred to as “pixel portion”), that is, the reference thickness WC increases,
This is because the viewing angle of the display device 1 becomes narrow. Reference thickness W
C and the viewing angle have the above-described relationship for the following reason.

The light emitted from each EL element 33 is separated into light of red and green wavelengths by each color filter 21 facing each EL element 33 via the main substrate 5. At this time, as the thickness WD of the pixel portion of the main substrate 5 increases, the distance between each EL element 33 and the color filter 21 facing the EL element increases. The observer moves the display device 1 to the main substrate 5
When viewed from a direction inclined from the normal direction 32, the EL element 3 facing each color filter 21 increases as the distance increases.
EL elements 33 different from 3 are more likely to be seen overlapping with the respective color filters 21. As a result, of all the pixels of the display device 1, pixels that should be red originally appear green, and pixels that should be illuminated do not emit light, that is, a color shift occurs. As a result, the display quality of the display device 1 deteriorates.
If the distance is the same, the color shift is more likely to occur as the angle between the line of sight of the observer and the normal direction 32 of the main substrate 5 increases. As described above, as the thickness of the pixel portion on the main substrate 5 increases, the viewing angle of the display device 1 decreases.

A method for manufacturing the color EL display device 31 will be described below. In the following description, specific materials and dimensions of components constituting the display device 1 and specific manufacturing methods are mere examples, and are not limited to those described below, and may be other types.

In the present embodiment, main substrate 5 is realized by, for example, a glass substrate. In the present embodiment, the main substrate 5 is OA-2 manufactured by NEC Glass.
Has an initial thickness WD of 1.1 mm. Main board 5
Are not formed in the main substrate 5 at the time when is prepared.

First, a thin film of a light-transmitting conductive material is formed on one surface 31 of the main substrate 5, and the thin film is processed into a predetermined shape. As a result, all the lower electrodes 11
Are formed on one surface 31 of the main substrate 5. In this embodiment, the conductive material is ITO (Indium-tin-Oxide: indium-tin oxide), and the film thickness of the thin film is 50%.
The thickness of the thin film is not less than 500 nm and not more than 500 nm, and a sputtering method, an electron beam evaporation method, or a spray method is used as a method for forming the thin film.

After the formation of the lower electrodes, on the surfaces of all the lower electrodes 11 and the exposed portions of the one surface 31 of the main substrate 5,
A thin film made of a light-transmitting insulating material is formed as the lower insulating layer 12. In the present embodiment, it is assumed that the lower insulating layer 12 is configured by stacking first and second insulating layers. In this embodiment, the insulating materials forming the first and second insulating layers are SiO ₂ and Si, respectively.
₃ N ₄ and the thickness of the lower insulating layer 12 is 200 nm or more and 5
It is assumed that the thickness is equal to or less than 00 nm, and the lower insulating layer 12 is formed by sputtering. Further, at least the end of each lower electrode 11 is not covered with the lower insulating layer 12 and serves as a terminal of each lower electrode 11.

After forming the lower insulating layer, on the lower insulating layer 12,
The light emitting layer 13 is formed. In this embodiment, the temperature of the main substrate 5 after the formation of the lower insulating layer is set to 20 to form the light emitting layer.
While maintaining the temperature at 0 ° C or more and 300 ° C or less, Zn
S: It is assumed that a film is formed using an electron beam evaporation method with an Mn pellet as an evaporation source. As a result, the light emitting layer 13 is formed on the lower insulating layer 12. In the present embodiment, the ZnS: Mn pellet is obtained by adding 0.2 wt% to 0.6 wt% of manganese (Mn) to ZnS, and the light emitting layer 13 has a thickness of 400 nm to 900 nm. I do.

After the formation of the light emitting layer, a thin film made of an insulating material is formed on the light emitting layer 13 as the upper insulating layer 14. In the present embodiment, the configuration, thickness,
The material and the forming method are the same as those of the lower insulating layer 12, for example, except that the lamination order of the first and second insulating layers is reversed. Upper insulating layer 14
After formation, the light emitting layer 1 formed by using the electron beam evaporation method
In order to improve the crystallinity of 3, the entire main substrate 5 after the formation of the upper insulating layer is subjected to a heat treatment in a vacuum. In this embodiment, the heating temperature of the heat treatment is 450 ° C. or more and 650 ° C.
The heating time of the heat treatment is 1 hour or more and 6 hours or less.

After the heat treatment, a thin film made of only a conductive material containing a magnetic substance or a magnetic substance having conductivity is formed to cover the surface of the upper insulating layer 14 and the exposed portion of the one surface 31 of the main substrate 5. Then, the thin film is processed into a predetermined shape. As a result, all the upper electrodes 15 are
On top of, is formed. In this embodiment, the thin film is formed of a magnetic material having conductivity, the magnetic material is nickel (Ni), the thickness of the thin film is 100 nm or more and 600 nm or less, and the thin film is formed by a so-called photo-etching process. Is processed into a stripe shape.
Each upper electrode 15 extends on one surface 31 of the substrate 5 beyond the end of the upper insulating layer 14. A portion of each upper electrode 15 on the substrate 5 becomes a terminal of each upper electrode 15. Through the steps from the formation of the lower electrode 11 to the formation of the upper electrode 15, the element portion 6 is formed on one surface 31 of the main substrate 5.

A concave portion 43 is formed on one surface 41 of the sealing substrate 17 in parallel with, or after or before the formation of the element portion 6. In the present embodiment, the sealing substrate 17 is made of glass, and the thickness WA of the sealing substrate 17 before processing is 1.8 mm.
Is 0.7 mm, and one surface 41 of the sealing substrate 17 is dug using a grindstone to form the recess 43. One surface 41 of sealing substrate 17
The digging process is also left in the peripheral portion of as a bonding frame when the sealing substrate 17 is bonded to the main substrate 5. Next, an injection hole 44 is provided in the sealing substrate 17.

After the formation of the recess, the one surface 31 of the main substrate 5 after the formation of the element portion and the one surface 41 of the sealing substrate 17 are opposed to each other.
The periphery of 41 is adhered using an adhesive. In the present embodiment, it is assumed that the adhesive is an epoxy resin. The adhesive becomes the sealing adhesive layer 42 after curing. As a result, the main substrate 5, the sealing substrate 17, and the sealing adhesive layer 42 are formed.
Thus, a sealing cell having a configuration in which the element portion 6 is surrounded is completed. The element section 6 is arranged in a gap between the main substrate 5 and the sealing substrate 17, that is, in the internal space of the sealing cell. The terminal of each lower electrode 11 and the terminal of each upper electrode 15 are exposed outside the internal space of the sealing cell. The injection hole 44 communicates with the internal space of the sealing cell.

After bonding the substrate, a protective substance is filled in the inner space of the sealing cell, and the injection hole 44 is sealed. As a result, the protective material layer 18 is completed. In the present embodiment,
It is assumed that the protective material layer 18 is formed by the following procedure. After bonding the substrate, the air in the internal space of the sealing cell is exhausted, and the internal space is evacuated. Next, at least the injection hole 44 of the sealing cell is immersed in a protective substance liquid stored in a tank prepared in the chamber, and the chamber is filled with nitrogen (N ₂ ). As a result, the protective substance liquid is filled in the internal space of the sealing cell.
After the protective substance liquid fills the internal space, the injection hole 4
4 is sealed by the sealing member 46. The above is the step of forming the protective material layer 18 in the present embodiment. In the present embodiment, the protective substance liquid is a mixture of silica gel and silicon oil, and the weight ratio of silica gel in the protective substance liquid is 25 wt%. Sealing substrate 17
The sealing portion 7 is completed by the steps from the processing of the step (1) to the sealing of the injection hole 44.

After completion of the sealing portion, a concave portion 37 is formed on the other surface of the main substrate 5. In the present embodiment, the concave portion 37 is formed by the following procedure. After completion of the sealing portion, the outer surface of the sealing portion 7, the portion of the one surface 31 of the main substrate 5 where the terminals of the lower and upper electrodes 11, 15 are formed, and the peripheral portion of the other surface 36 of the main substrate 5 Are covered with a resist for etching resistance. After the formation of the resist film, the other surface 36 of the main substrate 5 is etched by a wet etching method using an etchant containing hydrofluoric acid as a main component. As a result, a recess 37 is formed in the other surface 36 of the main substrate 5. The above is the process of forming the concave portion 37 in the present embodiment.

The thickness between the bottom surface of the concave portion 37 of the main substrate 5 and the one surface 31 of the main substrate 5, that is, the thickness of the pixel portion of the main substrate 5 is the reference thickness WC. The peripheral edge of the other surface 36 of the main substrate 5 remains in a frame shape even after the formation of the concave portion. In the present embodiment, it is assumed that the reference thickness WC is 100 μm. The panel member 3 is completed by the above processing.

The filter portion 8 is formed on one surface 51 of the counter substrate 9 in parallel with the step of forming the panel member 3 or after or before the step of forming the panel member 3. In the present embodiment, it is assumed that the filter unit 8 is formed in the following procedure. First, all the red filters 21R and all the green filters 21G are formed using photolithography technology.
Each is formed in a stripe shape and parallel to each other. At this time, one of the red and green filters 21R and 21G is formed on the side of one of the filters.
The sides of the other one of the two types of color filters 21 formed later are superposed respectively. The positions where the side portions are overlapped are, when the filter portion 8 is bonded to the main substrate 5, when viewed from the normal direction 32 of the main substrate 5, each EL element 33 and the EL element 33 adjacent to the EL element 33. Are portions corresponding to the gaps between the two. As a result, the overlapped portion of the two color filters 21R and 21G becomes the light shielding filter 23. The above is the process of forming the filter section 8 in the present embodiment. In the present embodiment, the red filter 21R is a CR-70 manufactured by Fuji Hunt.
01, and the green filter 21G is a CG made by Fuji Hunt.
Let it be −7001. As a result, the filter side member 4 is completed.

After the completion of the two members 3 and 4 described above, the panel member 3 and the filter-side member 4 are connected to one surface 5 of the counter substrate 9.
1 is a bottom surface 3 of the concave portion 37 of the main substrate 5 via the filter portion 8.
8 and the respective EL elements 33 and the respective color filters 21 are aligned so as to face each other via the pixel portion of the main substrate 5. In the present embodiment, it is assumed that the panel member 3 and the filter-side member 4 after the alignment are vacuum-sucked to a predetermined worktable surface. After the alignment, a light-transmitting adhesive is interposed between the filter portion 8 of the filter-side member 44 and the bottom surface 38 of the concave portion 37 of the main substrate 5. The adhesive is spread between the entire surface of the filter unit 8 and the bottom surface 38.

From a first point in time after the alignment to a second point in time when the adhesive is cured, one or a plurality of magnetic force sources 57 are connected to all of the EL elements 33 via the filter side member 4 and the main substrate 5.
And a magnetic force is generated. As a result, during the first and second time points, the force caused by the magnetic force acting between the magnetic force source 57 and the upper electrode 15 becomes:
The two members 3 and 4 act on at least one of the panel member 3 and the filter side member 4 that are vacuum-sucked in a direction approaching each other. As a result, the panel member 3 and the filter-side member 4 are brought into close contact with each other. The adhesive becomes the transparent adhesive layer 52 after curing.

After the adhesive is cured, the space between the inner peripheral surface of the concave portion 37 of the main substrate 5 and the side surface 55 of the filter-side member 4 remains as a frame-shaped groove. Therefore, after the adhesive is cured, the frame-shaped groove is filled with a predetermined filler in order to reinforce the display device 1 and improve the appearance of the device 1. The filler becomes the side adhesive layer 53 after curing. In the present embodiment, the filler is an epoxy resin. The display device 1 is completed through the above steps. The above is the description of the manufacturing process of the display device 1.

As described above, the pixel portion of the main substrate 5 is as thin as possible in order to widen the viewing angle of the device 1, so that the intensity of the pixel portion is very weak.
In the method of manufacturing display device 1 of the present embodiment, a force caused by a magnetic force is used when bonding panel member 3 and filter-side member 4. As a result, when the two members 3 and 4 are bonded, the pixel portion of the main substrate 5 can be prevented from breaking, and the main substrate 5 and the filter section 8 can be sufficiently adhered. As a result, in the display device 1, the EL element 33 and the color filter 21 are sufficiently close to each other, and the viewing angle of the display device 1 becomes a wide viewing angle that is practically sufficient. The display quality is improved over the display quality of the conventional color EL display device. In addition, since the yield of the display device 1 is improved, the manufacturing cost of the display device 1 is reduced.

Both the lower and upper electrodes 11, 15
It may be made of a material that does not contain a magnetic material. In this case, when the panel member 3 and the filter-side member 4 are adhered, two sets of magnetic force sources 57 are disposed so as to sandwich the two members 3 and 4 after the alignment, and a force caused by a magnetic force between the magnetic force sources 57 of each set. Thereby, the two members 3 and 4 are brought into close contact with each other. One set of magnetic force sources 57 includes one or more magnetic force sources 57. At the time of manufacturing the display device 1 having the configuration of the present embodiment, it is preferable that at least one of the lower electrode and the upper electrode contains a magnetic substance. This is for the following reason.

When at least one of the lower and upper electrodes 11 and 15 contains a magnetic substance, the force caused by the magnetic force between the magnetic force source 57 and the one of the electrodes 11 It is weaker than the force caused by the magnetic force between the two sets of magnetic sources 57 when no magnetic substance is contained. Therefore, when the former force is applied to the two members, the breakage of the pixel portion of the main substrate 5 can be prevented more than when the latter force is applied to the two members. That is, the one electrode is formed from a magnetic substance,
When the two members 3 and 4 are bonded, the one electrode and the one
The force resulting from the magnetic force between the magnetic force source 57 and the set
4, the main substrate 5 is prevented from cracking. As a result, the yield of the display device 1 can be improved, so that the manufacturing cost of the display device 1 is further reduced.

When both the lower and upper electrodes 11 and 15 do not contain a magnetic substance, the sealing substrate 7 is attached to the main substrate 5 before the sealing substrate 7 is bonded to the main substrate 5 in the manufacturing process of the display device 1. The recess 37 needs to be formed. To this end, the manufacturing process is performed according to the following procedure. EL
After the element formation, the peripheral portion of the other surface of the main substrate 5 and the EL element 33
The surface is subjected to a protection process for removing the influence of the process for processing the concave portion 37, for example, a coating process of an etching resistant resist. After the protection process, a concave portion 37 is formed in the main substrate 5, the processed main substrate 5 and the filter-side member 4 are bonded to each other using a magnetic force, and the concave portion 37 of the main substrate 5 and the filter-side substrate 4 Fillers are filled in the gaps between them.
After the filling, the above-described protection treatment is removed from the EL element 33, and the sealing substrate 17 is contained so as to include the removed EL element 33.
Is adhered to the main substrate 5, and finally a protective material layer 18 is formed. When the display device 1 is manufactured in such a process, the process of applying the protection process to the EL element surface and the process of removing the protection process from the EL element surface affect the EL element. May reduce the performance.

As described above, when the at least one electrode is formed of a material containing a magnetic substance, that is, in the manufacturing method of the present embodiment, the recess 3 of the main substrate 5 is formed.
Since the seal portion 7 is formed prior to the formation of the recess 7, when forming the concave portion 37, a protection process is performed on the outer surface of the seal portion 7 to remove the influence of the processing for processing the concave portion 37. I have. The manufacturing method according to the present embodiment uses the EL element 3
Since the protection process is not directly applied to the EL device 33, the reliability of the EL element 33 does not decrease due to the protection process. When the protection process is performed on the surface of the seal portion 7, the processing step is E
The process is easier and requires fewer steps than the process of performing the protection process on the surface of the L element 33. Based on these facts, when the material of the at least one electrode includes a magnetic substance, the number of steps in the manufacturing process of the display device 1 is reduced and the display is reduced as compared with the case where the material of the two electrodes does not include a magnetic substance. Reduction of manufacturing cost of device 1 and display device 1
It is possible to prevent a decrease in the reliability of the EL element 33 inside. Therefore, it is preferable that the material of at least one electrode contains a magnetic substance.

The configuration of each component in the display device 1 according to the first embodiment is not limited to the above-described specific configuration as long as the characteristic configuration of each component is maintained. You may.
Other specific configurations of the components will be described below.

The adhesive used as the material of the transparent adhesive layer 52 preferably has a fluidity viscosity as low as possible. this is,
The higher the viscosity of the adhesive, the thicker the transparent adhesive layer 52 tends to be, so that it is difficult to make the EL panel member 3 and the filter side member 4 adhere to each other, and the bottom surface 38 of the concave portion 37 of the main substrate 5 and the filter This is because it becomes difficult to spread the adhesive over the entire portion of the space between the portion 8 and the portion corresponding to the pixel region 34 (hereinafter referred to as “space portion”). The adhesive used as the material of the transparent adhesive layer 52 may be a so-called ultraviolet curable resin.

Instead of the transparent adhesive layer 52, a liquid having no adhesive force may be filled in the space, and the main substrate 3 and the filter-side member 4 may be adhered only by the side adhesive layer 53. In this case, the liquid has a lower viscosity than the adhesive, has a light-transmitting property, and has a refractive index equal to that of the main substrate 5. Preferably, the liquid spreads over the entire space. This makes it easier to spread a substance having the same refractive index as that of the main substrate 5 over the entire space, so that it is possible to prevent a decrease in display quality due to the refractive index of the display device 1. In particular, the larger the size of the display device 1 is, the larger the space is. Therefore, the use of the liquid makes it easier to prevent the display quality from deteriorating. When the space is filled with the liquid, the adhesive force of the filler as a material of the side adhesive layer 53 is the adhesive force of the filler when the transparent adhesive layer 52 is interposed in the space. More preferably, it is stronger.

The thickness of the pixel portion of the main substrate 5, that is, the reference thickness WC, is specifically 50 μm or more and 200 μm in order to keep the viewing angle of the display device 1 at a practically sufficient angle for the device.
It is preferably not more than μm. In the present embodiment, the reference thickness WC is 100 μm in order to set the viewing angle to 180 degrees.
m. Also, the magnetic material forming the upper electrode 15 may be replaced with another magnetic material instead of nickel (Ni).
For example, it may be iron (Fe) or cobalt (Co).

FIG. 3 is a sectional view of a color EL display device 71 manufactured by the method for manufacturing a color EL display device according to the second embodiment of the present invention. Since the color EL display device 71 of the second embodiment (hereinafter abbreviated as “display device 71”) includes components having the same configuration as the display device 1 of the first embodiment, the components are the same. The reference numerals are attached and the description is omitted.

The display device 71 includes an element-side member 73, a filter-side member 74, and a protective material layer 75. Element side member 7
3 includes a main substrate 76 and an element portion 77. The filter side member 74 includes the filter section 8 and the counter substrate 78. The element portion 77 includes a plurality of lower electrodes 91 and one lower insulating layer 9.
2, a single light emitting layer 93, one upper insulating layer 94, and a plurality of upper electrodes 95. Note that, in FIG. 3, reference numerals for some of the filters 21R, 21G, 23 and the upper electrode 95 are omitted.

The main substrate 76 is a plate-shaped member made of an insulating material. The element section 77 is arranged on one surface of the main substrate 76.
The counter substrate 78 is a plate-shaped member having a light-transmitting property. The filter section 8 is arranged on one surface 82 of the counter substrate 78.
The element-side member 73 and the filter-side member 74 are
And the opposing substrate 78 are parallel to each other, and
6, 78 are arranged via a plurality of spacers 79 so that the one surfaces 81, 82 face each other. The spacer 79 is
For example, it is realized by spherical plastic beads. The main substrate 76 and the counter substrate 78 are arranged parallel to each other with a predetermined space therebetween, and the peripheral portions of the substrates 76 and 78 are bonded to each other by the adhesive layer 83.
As described later, the element-side member 73 and the filter-side member 74
When bonding the filter side member 74 to the element side member 73,
Magnetic force is used to apply a force for relatively pressing the.

The two substrates 76 and 78 and the adhesive layer 83
A sealing cell having a hollow internal space is formed, and the element section 77 and the filter section 8 are arranged in the internal space. The relative positional relationship between the element unit 77 and the filter unit 8 when viewed from the normal direction 84 is equal to the relative positional relationship between the element unit 6 and the filter unit 8 in the first embodiment. The counter substrate 78 is provided with an injection hole 44 communicating with the internal space of the sealing cell. The injection hole 44 is sealed from the other surface 85 of the counter substrate 78 by a sealing member 86.

The protective material layer 75 is formed by filling the gap between the main substrate 76 and the counter substrate 78, that is, the internal space of the sealing cell, with a protective material. The protective substance is, for example, the same as that forming the protective substance layer 18 of the first embodiment. Therefore, the protective substance covers the surface of the element portion 77. The end of each lower electrode 11 and the end of each upper electrode 15 are connected to the lower and upper electrodes 11, 1 respectively.
The terminal 5 is exposed outside the sealing cell.

All the components 91 to 95 of the element portion 77
Compared with the component parts 11 to 15 of the element unit 6 of the display device 1 according to the first embodiment, only the characteristics regarding light are different from each other, and the structures and functions are the same. I do. That is, the element portion 7
The structure of 7 is a so-called simple matrix structure, and a portion where each lower electrode 91 and each upper electrode 95 in the element portion 77 intersect as viewed from the normal direction 84 becomes an EL element 96. Each EL element 96 is a thin-film EL element having a double insulation structure. When viewed from the normal direction 84 of the main substrate 76, the main substrate 7
The area where all the EL elements 96 are arranged in one surface 81 of the pixel 6 is referred to as a pixel area 34.

Of the components 91 to 95 of the element portion 77,
At least the upper electrode 95 and the upper insulating layer 94 have a light transmitting property. The lower electrode 91 is preferably formed of a material having conductivity and capable of reflecting light. In the present embodiment, the light emitting layer 93 is specifically formed of ZnS: Mn, and emits yellow-orange light by electroluminescence when an AC electric field is applied between the lower and upper electrodes 91 and 95. I do. Lower and upper electrodes 91 and 95 in element portion 77
It is preferable that the conductive material to be at least one of the above includes a magnetic substance in order to use a force caused by a magnetic force when the element-side member 73 and the filter-side member 74 described later are bonded. In this embodiment, the conductive material forming the lower electrode 91 includes a magnetic substance.

In each of the EL elements 96 having the above-described structure, the upper electrode 91 is a thin film piece made of a conductive material having a light transmitting property, and the lower electrode 95 is a thin film piece made of a material reflecting light. The light from the light emitting layer 93 in each of the EL elements 96 passes through the upper insulating layer 94 and the upper electrode 95, and then passes through one of the two types of color filters 21 to emit red or green light. Is split into The split light is emitted to the outside of the display device 71 from the other surface 85 side of the counter substrate 78. As a result, of the light emitted from the light emitting layer 93, the light emitted to the lower electrode 95 side is reflected by the lower electrode 95, and then is reflected by the lower insulating layer 92, the light emitting layer 93, the upper insulating layer 94, The light passes through the electrode 95 and the protective material layer 75, is separated by the color filter 21, and is emitted from the other surface 85. As a result, the display device 71 uses the other surface 85 of the counter substrate 78 as a display surface, and a portion where each EL element 96 and each color filter 21 overlap each other as a display element. One pixel is composed of two adjacent display elements each including a red and a green color filter. With such a configuration, the display device 71 emits so-called multicolor light.

A method for manufacturing the display device 71 will be described below. In the following description, specific materials and dimensions of components constituting the display device 71 and specific manufacturing methods are mere examples, and are not limited to those described below, and may be other types. Since the method for manufacturing the display device 71 of the second embodiment includes the same steps as the method for manufacturing the display device 1 of the first embodiment, detailed descriptions of the steps and examples of the steps are omitted. .

First, the element portion 77 is formed on one surface 81 of the main substrate 76. The process of forming the element section 77 is different from the step of forming the element section 6 of the first embodiment only in the following points, and is otherwise the same. The material forming the lower electrode 91 is a conductive material containing a magnetic substance that can withstand heat treatment for improving the crystallinity of the light emitting layer 93, for example, a magnetic substance having a melting point equal to or higher than the heating temperature during the heat treatment. Upper electrode 9
The material forming 5 is a light-transmitting conductive material. In addition, the specific configuration and process of the element portion 77 in the present embodiment are different from those of the element portion 6 of the first embodiment in that the material of the lower electrode 91 is molybdenum (M
o), tantalum (Ta), or tungsten (W), except that the material of the upper electrode 95 is ITO, and the others are equal. In the present embodiment, the main substrate 76 is a 1.1 mm thick OA-2 made by NEC Glass.
It is assumed to be realized by. As a result, the element side member 73 is completed.

In parallel with the step of forming the element-side member 73 or after or before the step of forming the element-side member 73, the opposing substrate 78 is formed.
The filter portion 8 is formed on one surface 82 of the filter. The outline and the example of the process of forming the filter unit 8 are the same as the outline and the example of the process of forming the element unit 6 of the first embodiment. As a result, the filter side member 74 is completed.

After the completion of the above-mentioned two members 73 and 74, the element-side member 73 and the filter-side member 4 are connected to each other, and the first and second surfaces 81 and 82 of the main and counter substrates 76 and 77 are interposed between the filter unit 8 and the element unit 77. And each EL element 33
The color filters 21 are positioned so as to face each other, with the spacer 79 interposed therebetween. In the present embodiment, it is assumed that the element-side member 73 and the filter-side member 74 after the alignment are vacuum-sucked to a predetermined worktable surface. After the alignment, an adhesive is interposed between the main and counter substrates 76 and 77 in a frame shape between the peripheral portions of the one surfaces 81 and 81.

From a first point in time after the alignment to a second point in time when the adhesive is hardened, one or a plurality of magnetic force sources 57 and the magnetic plate 102 are arranged in a positional relationship sandwiching the two members 73 and 74. Then, the magnetic force source 57 generates a magnetic force. The positional relationship may be as shown in FIG. 3 or vice versa. The magnitude of the magnetic force is determined by the two members 73,
The interval between the pixels 74 is set so as to maintain a predetermined interval in any portion in the pixel region 34. As a result, during the first and second time points, the force caused by the magnetic force acting between the magnetic force source 57 and the magnetic plate 102 is absorbed by the vacuum suction 2
The two members 73, 74 act on the two members 73, 74 in a direction in which they approach. As a result, the element side and the filter side members 3 and 4 are bonded at a predetermined interval. The adhesive becomes the adhesive layer 83 after curing. As a result, the sealing cell is completed.

After the substrate is bonded, the inner space of the sealing cell is filled with a protective substance, and after filling, the injection hole 44 is sealed. As a result, the protective material layer 75 is completed. The outline and the example of the process of forming the protective material layer 75 are the same as the outline and the example of the process of forming the protective material layer 18 of the first embodiment. Through the above steps, the display device 71 is completed. The above is the description of the manufacturing process of the display device 71.

As described above, the display device 7 according to the second embodiment is described.
In the manufacturing method of item 1, the element-side and filter-side members 7
At the time of bonding 3,74, a force caused by a magnetic force is used. In addition, when the force caused by the magnetic force is used at the time of the bonding, the control of the force is easier than when the force caused by a mechanical method is used. This makes it easy to apply a uniform force to the two members 73 and 74 throughout the pixel region 34 during the bonding. This can also prevent an excessive force from being applied to a part of the spacer 79 interposed between the two members 73 and 74. As a result, when the two members 73 and 74 are bonded, the main and counter substrates 76 and 7
8. It is possible to bond the two members 73 and 74 while keeping the distance between them uniform while preventing the spacer 79 and the EL element 96 from being damaged.

Therefore, the manufacturing method described above includes
74 due to the distortion of at least one of
It is possible to easily prevent the space between the members 3 and 74 from partially expanding. As a result, in the display device 71, the EL element 96 and the color filter 21 are sufficiently close to each other, and the viewing angle of the display device 71 is wide enough to be practically sufficient. The display quality of the technical color EL display device is improved. In particular, the distortion of the members 73 and 74 is more likely to occur as the area of the display surface of the display device 71 increases. Therefore, when the size of the display device 71 is increased, the display quality of the display device 71 can be improved by using the manufacturing method of the second embodiment. In addition, the manufacturing method can improve the yield of the display device 71, so that the manufacturing cost of the display device 71 can be reduced.

Further, the display device 71 includes the two substrates 7
A spherical spacer 79 is interposed between 3, 74. As a result, the distance between the EL element 96 and the color filter 21 is prevented from being shorter than a predetermined distance. Thereby, in the display device 71, the destruction of the color filter 21 due to the so-called minute destruction point of the EL element is prevented.

The spacer 79 is made of a flexible material,
For example, it is preferably formed of plastic. In this case, when the spacer 79 is formed of the above-described material, when the two members 73 and 74 are bonded to each other, both members 73 and 7 are used.
When pressure is applied to the spacer 79 by the force acting on the spacer 4, the spacer 79 is temporarily deformed by the pressure, but can immediately return to the original shape. This is because the interval can always be kept at a predetermined value.

Both the lower and upper electrodes 91 and 95 are
It may be formed from a material that does not include a magnetic material. When at least one of the lower and upper electrodes 91 and 95 is formed of a material containing a magnetic material, the two members 73 and 73 are formed by a force caused by a magnetic force between the at least one electrode and the magnetic force source 57. 74 can be attached, so that the magnetic plate 102 is not required. Therefore, in the above case, the step of installing the magnetic plate 102 can be omitted in the manufacturing process, and the manufacturing process is simplified.

The configuration of each component in the display device 71 of the second embodiment is such that the characteristic configuration of each component is maintained.
The configuration is not limited to the specific configuration described above, and may be another configuration. Other specific configurations of the components will be described below.

The material of the upper electrode 95 is not limited to ITO.
Other light-transmitting conductive materials may be used. Further, the material of the upper electrode 95 may be a light-transmitting and conductive magnetic material because the upper electrode 95 exhibits magnetism, or a light-transmitting conductive material containing a magnetic material. Good. For example, as the latter material, a magnetic substance such as nickel (Ni), iron (Fe), or cobalt (C
o).

The opposing substrate 82 is made of the sealing substrate 17 of the first embodiment in order to improve the moisture-proof effect of the EL element.
Similarly, the other surface 82 facing the element portion 77
May be formed with a concave portion. The recess is formed by digging, for example, similarly to the sealing member 17. In this case, the filter section 8 is arranged on the bottom surface of the concave portion of the counter substrate 82. As a result, the volume of the internal space of the sealing cell is larger than when there is no concave portion,
The amount of the protective substance increases, and the moisture-proof effect can be enhanced.

The detailed method of each step of the method for manufacturing the display devices 1 and 71 of the first and second embodiments is not limited to the above-described specific method as long as the characteristics of each step are maintained. ,
Other techniques may be used. Another specific method of the above step will be described below.

In the first and second embodiments, a magnetic force source 5 is provided in the two members 3, 4;
It is preferable that there are a plurality of action points where the magnetic force from 7 acts. This is for the following reason. In the first embodiment, when the two members 3 and 4 are bonded to each other,
Of the space between the bottom surface 38 of the concave portion 37 and the filter portion 8 corresponding to the pixel region 34 (hereinafter, “space portion”).
Air bubbles may enter inside the layer made of the transparent adhesive before curing. In this case, if there are a plurality of action points, before the curing of the transparent adhesive, the magnetic force of each of the action points is appropriately adjusted with time, so that the bubbles are outside the transparent adhesive layer, Alternatively, a force can be applied to the layer such that it is extruded into a portion of the layer outside the space. In the second embodiment, the element portion 77 and the filter portion 8 in the protection material layer 75 in the protection material layer 75 are used.
Air bubbles may enter in the area between. In this case, if there are a plurality of action points, after the formation of the protective material layer 75, the magnetic force of each of the action points is appropriately adjusted with the passage of time, and the bubbles are formed outside the portion in the protective material layer 75. Force can be applied to the protective material layer 75 and the two members 73, 74 to be extruded into parts.

That is, in the first and second embodiments, the air bubbles may cause the display quality of the display devices 1 and 71 to deteriorate. If there are a plurality of action points, after the interposition of the transparent adhesive material and after the formation of the protective material layer 75,
The air bubbles can be removed from the inside of the portion by the above procedure. As a result, it is possible to prevent the display quality from deteriorating due to the bubbles. Further, as a result, the yield of the display devices 1 and 71 caused by the bubbles can be improved, so that the manufacturing cost of the display devices 1 and 71 can be reduced. For this reason, it is preferable that there are a plurality of the action points.

The magnetic force source 57 is not limited to a cylindrical magnet, but may have another configuration. For example, the magnetic force generation source 57
A magnet having a shape other than a cylinder may be used. It may be an electromagnet. Further, the magnetic force generation source 57 includes the two members 3,
4: a single magnet or electromagnet, as long as it is of a shape suitable for bringing the 73, 74 into close contact. Further, it is preferable that there are a plurality of the magnetic force generation sources 57 in order to easily provide a plurality of the action points.

The configuration of each component in the display devices 1 and 71 of the first and second embodiments is not limited to the above specific configuration as long as the characteristic configuration of each component is maintained. Other configurations may be used. Other specific configurations of the components will be described below.

The lower electrodes 11, 91 and the upper electrode 15,
The material forming at least one of the 95 is not limited to the magnetic substance itself, and may be any material containing at least a magnetic substance. The magnetic substance is preferably contained in the upper electrodes 15 and 95, rather than in the lower electrodes 11 and 91. This is for the following reason.

When the magnetic material is contained in the lower electrodes 11, 91 or the upper electrodes 15, 95, respectively, the effect of bringing the two members 3, 4; 73, 74 into close contact using the magnetic force is equal to each other. In the element portion forming step in the manufacturing process of the display devices 1 and 71, after forming the light emitting layers 13 and 93, it is necessary to perform heat treatment, that is, so-called annealing on the light emitting layers 13 and 93. The lower electrodes 11 and 91 are light emitting layers 13 and 93
Are formed on the main substrates 5 and 76 prior to the formation of the substrate, so that they are simultaneously heated during the heat treatment. Therefore, the lower electrode 11,
When the material 91 includes a magnetic substance, the magnetic substance must be able to withstand the heat treatment, so that the substances usable as the magnetic substance are limited. Upper electrode 15,
Since 95 is formed after the formation of the light emitting layers 13 and 93, no heat treatment is performed. Therefore, when the material of the upper electrodes 15 and 95 includes a magnetic substance, it is not necessary to consider the durability of the heat treatment when selecting the magnetic substance. As a result, the upper electrode 1
5, 95 contain the magnetic material, the lower electrode 11,
The former case is more preferable than the latter case because the range of selection of the magnetic material can be wider than that of the case where the magnetic material 91 contains the magnetic material.

When the upper electrodes 15 and 95 contain a magnetic substance as described above, for example, the magnetic substance is made of a material that can further increase the magnetic force between the upper electrodes 15 and 95 and the magnetic force source 57. It is preferable to select As a result, the two members 3, 4; In the above case, it is preferable to prevent the deterioration of the characteristics of the EL elements 33 and 96 in advance by adjusting the heat treatment of the light emitting layers 13 and 93 so as to match the magnetic substance.

The two electrodes 11 in the EL elements 33 and 93,
15; 91, 95, the electrode farthest from the color filter 21, that is, the upper electrode 15 of the first embodiment and the lower electrode 91 of the second embodiment
3 also serves as a reflector for reflecting light radiated from.
Therefore, it is preferable that the reflectance of the material forming the farther electrodes 15 and 91 be as high as possible in order to increase the brightness of the display surfaces of the display devices 1 and 71.

It is preferable that a plurality of components interposed between the light emitting layers 13 and 93 and the display surfaces 56 and 85 of the display devices 1 and 71 have the same refractive index. In particular, in the first embodiment, the refractive index of the transparent adhesive layer 52 is preferably equal to the refractive index of the main substrate 5, and in the second embodiment, the refractive index of the protective material layer 75 is Preferably it is equal to the rate. These are for the following reasons.

In general, as shown in FIG. 4, when light sequentially passes through two spaces each filled with a medium having a different refractive index, the light incident angle θ1 at the boundary surface between the two spaces and The Snell's law expressed by the following equation 1 is satisfied between the light and the refraction angle θ2. In the following equation, “n
“1” and “n2” are the refractive indexes of the media I and II in the space on the entrance side and the exit side. When the refractive indexes of the media in the two spaces are different from each other, it is apparent that scattering and absorption of light occur at the interface between the two spaces.

N1 ÷ n2 = sin θ2 ÷ sin θ1 (1) In the display device 1 according to the first embodiment, at least the lower electrode 11, the lower insulating layer 12, and the filter unit 8
It is sufficiently thinner than the pixel portion of the main substrate 5 and the counter substrate 9. Therefore, inside the display device 1, the light emitted from the light emitting layer 13 is transmitted to the lower electrode 11 and the lower insulating layer 1.
2 and the filter section 8, and the light is refracted on one surface of the main substrate 5 and the bottom surface 38 of the concave portion 34 and on one surface of the counter substrate 9. Therefore, in order to prevent the light from attenuating from the light emitting layer 13 to the display surface 56 of the display device 1 due to refraction at the boundary surface, at least the refractive index of the transparent adhesive layer 52 is set to the main substrate. It is preferably equal to the refractive index of 5. In the first embodiment, since the refractive indices of the main substrate 5, the transparent adhesive layer 52, and the counter substrate 9 are equal to each other, the loss due to light scattering and absorption in the display device 1 is minimized. Is limited.

In the display device 71 of the second embodiment, at least the upper electrode 95, the upper insulating layer 94, and the filter section 8 are each sufficiently thinner than the counter substrate 78. Therefore, in the display device 71, the light emitted from the light emitting layer 93 travels substantially straight through the upper electrode 95, the upper insulating layer 94 and the filter unit 8, and is refracted on both surfaces of the counter substrate 78. Therefore, the light is transmitted from the light emitting layer 93 to the display device 71.
It is preferable that the refractive index of the protective material layer 75 is equal to the refractive index of the counter substrate 78 in order to prevent attenuation due to refraction at the boundary surface up to the display surface 85.

In the first embodiment, the transparent adhesive layer 5
2 is spread over the entire portion immediately below the pixel region 34 (hereinafter referred to as “first space portion”) in the space between the bottom surface 38 of the concave portion 37 of the main substrate 5 and the surface of the filter portion 8. Is preferred. In the second embodiment, the protective material layer 75 extends over the entire portion (hereinafter referred to as “second space portion”) immediately below the pixel region 34 in the internal space of the sealing cell. Is preferred. These are for the following reasons.

If the transparent adhesive layer 52 and the protective material layer 75 are not spread over the entire first and second space portions, respectively, the layers 52,
The refractive index of the portion where the portion 75 is located is different from the refractive index of the portion where the layers 52 and 75 are not provided in the first and second space portions. As a result, the display quality in the display surface of the display devices 1 and 71 is partially different, so that the display quality of the entire display devices 1 and 71 is deteriorated. Therefore, in order to prevent the display quality from deteriorating,
It is preferable that the transparent adhesive layer 52 and the protective material layer 75 extend over the entire first and second space portions.

The light emitting layers 13 and 93 may contain magnesium (Mg) for improving the emission spectrum. The light emitting layers 13 and 93 are formed of ZnS: Mn in order to change the emission spectrum, that is, to change the light emitted from the light emitting layers 13 and 93 to light having a wavelength other than yellow light.
In place of Ce added SrS (hereinafter “SrS:
Ce ") alone, and Z
First light emitting layer formed of nS: Mn and SrS: Ce
And a second light-emitting layer formed from the above. Light emitted from the latter stacked light emitting layer is white light.

The wavelength of light that can pass through the color filter 21 is
Not only the light of red and green wavelengths but also the light emitting layers 13 and 93
Display devices 1 and 71 according to the wavelength of light emitted from
May be set so as to emit multicolor light. For example, when the light-emitting layers 13 and 93 emit white light, that is, when the light-emitting layers 13 and 93 are formed by laminating two light-emitting layers formed of ZnS: Mn and SrS: Ce, respectively, the filter is used. The unit 8 may include three types of color filters that pass light of red, green, and blue wavelengths, respectively.

As described above, the display devices 1 and 71 of the first and second embodiments and the method of manufacturing the same are examples of the color EL display device of the present invention and the method of manufacturing the same. The color EL display device and the method of manufacturing the same according to the present invention can be implemented in various other forms as long as the main parts are equal to the display devices 1 and 71 of the first and second embodiments and the method of manufacturing the same. it can. In particular, the detailed configuration of the components in the color EL display device and the detailed method of the steps in the manufacturing process of the device can be the first and second embodiments if the same effects as those of the display devices 1 and 71 can be obtained. However, the present invention is not limited to those described above, and may be realized by other configurations and methods.

[0108]

As described above, according to one aspect of the present invention, in a method of manufacturing a color EL display device of a filter type, a first substrate having a plurality of EL elements formed on one surface and a color filter formed on one surface. At the time of lamination with the formed second substrate, at least one of the two substrates is generated by a magnetic force from a magnetic force source during a period from the time when the adhesive before curing is interposed between the two substrates to the time when the adhesive is cured. Then, a force is applied in a direction in which the two substrates relatively approach each other. As a result, the manufacturing method can prevent the first and second substrates from being damaged while also providing the color EL.
Deterioration of display quality of the display device can be prevented.

According to the second invention, the EL element in the color EL display device manufactured by the above-described manufacturing method contains a magnetic substance. As a result, the process for bonding the first and second substrates in the manufacturing process is simplified, so that the manufacturing cost of the color EL display device using the manufacturing method can be reduced. Furthermore, according to the third invention,
An upper electrode in the EL element contains the magnetic substance. As a result, the magnetic substance can be selected from substances capable of enhancing the magnetic force acting on the first and second substrates, regardless of the heat resistance of the substance. As a result, the force applied to the two substrates is increased to a sufficient degree for bonding the two substrates.

According to a fourth aspect of the present invention, in the above-described manufacturing method, the strength of the magnetic force is set such that the distance between the first and second substrates is maintained at a predetermined distance.
As a result, the above-mentioned manufacturing method is the same as the color E manufactured by the method.
That the viewing angle and display quality of the L display device are deteriorated,
It can be prevented beforehand. Further, according to a fifth aspect, in the above-described manufacturing method, there are a plurality of points of action of the magnetic force in the substrate. As a result, in the manufacturing method, it is possible to set the pressure distribution at the time of bonding and to remove bubbles mixed in the adhesive layer before curing.

According to a sixth aspect of the present invention, in the color EL display device manufactured by the above-described manufacturing method, the adhesive comprises at least the color filter and the EL in a space between the first and second substrates. The adhesive is spread over the entire pixel region, which is a portion facing the element, and the refractive index of the adhesive is equal to at least one of the first and second substrates. As a result, the display quality of the color EL display device is prevented from deteriorating. Furthermore, according to the seventh invention,
In the color EL display device manufactured by the above-described manufacturing method, the first pixel is replaced by the first
And a liquid having a refractive index equal to at least one of the second substrate and the second substrate. As a result, the color EL can be prevented from deteriorating due to the difference in the refractive index while preventing the display quality from deteriorating.
The manufacturing process of the display device is simplified.

According to the eighth invention, the color EL display device is formed by the above-described manufacturing method. As a result, in the color EL display device, deterioration of display quality is prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a color EL display device 1 manufactured by a manufacturing method according to a first embodiment of the present invention.

FIG. 2 is a plan view of the color EL display device 1 according to the first embodiment.

FIG. 3 is a sectional view showing a configuration of a color EL display device 71 manufactured by a manufacturing method according to a second embodiment of the present invention.

FIG. 4 shows a general behavior of light at a boundary surface between two layers each composed of two kinds of media in order to explain the relationship between the refractive indices of materials of components in the color EL display devices 1 and 71. It is a schematic diagram for description.

[Explanation of symbols]

 1,71 Color EL display device 5,76 Main substrate 9,78 Counter substrate 11,91 Lower electrode 13,93 Light emitting layer 15,95 Upper electrode 18,75 Protective substance layer 21 Color filter 33,96 EL element 52 Transparent adhesive layer 57 Magnetic source 102 Magnetic plate

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 5C094 AA02 AA08 AA11 AA12 AA36 AA37 AA42 AA43 AA44 AA55 BA27 CA19 DA07 DA13 EB02 ED03 ED12 FA01 FA02 FB03 FB04 GB01 JA13

Claims (8)

[Claims] 1. A step of forming a plurality of electroluminescent elements each having an electroluminescent light emitting layer interposed between a pair of electrodes on one surface of a first substrate, and a second substrate having a light-transmitting property. Forming a plurality of color filters through which light of a predetermined wavelength can pass, on one surface of the first and second substrates, the first and second substrates being opposed to each other with at least the color filters interposed therebetween, and an adhesive before curing A step of arranging the first and second substrates through a layer and interposing a layer between the first point and the second point at which the adhesive layer hardens, after the first and second substrates have been arranged. Generating a magnetic force for applying a force acting on the first and second substrates in a direction in which the first and second substrates approach each other. Manufacturing method. 2. The method according to claim 1, wherein the electroluminescent element includes a magnetic substance. 3. The method according to claim 1, wherein one of the pair of electrodes in the electroluminescent element, which is located farther from the first substrate than the electroluminescent light emitting layer, contains a magnetic substance. The method for manufacturing a color electroluminescent display device according to claim 1. 4. The method according to claim 1, wherein the magnitude of the magnetic force is a magnitude capable of maintaining a predetermined interval between the first and second substrates between the first time and the second time. The method for manufacturing a color electroluminescent display device according to claim 1, wherein 5. The method according to claim 1, wherein the magnetic force acts on the first and second substrates at a plurality of points. 6. The adhesive layer is disposed on at least a whole pixel region in a space between the first and second substrates where the color filter and the electroluminescent element face each other, and the curing is performed. The refractive index of the adhesive layer after the first and second
2. The method for manufacturing a color electroluminescent display device according to claim 1, wherein the refractive index is equal to at least one of the substrates. 7. After the adhesive layer has been cured, the first and the second pixels are provided in at least the entire pixel region in the space between the first and second substrates, where the color filter and the electroluminescent element face each other. 2. The method according to claim 1, further comprising: sealing a liquid having a refractive index equal to the refractive index of at least one of the second substrates. 8. A first substrate, a second substrate having a light-transmitting property, and a plurality of substrates arranged on one surface of the first substrate and each having an electroluminescent light emitting layer interposed between a pair of electrodes. The electroluminescent element, and the second
A plurality of color filters disposed on one surface of the substrate and capable of passing light of a predetermined wavelength, and an adhesive layer interposed between at least the first and second substrates facing each other with the color filter interposed therebetween. From a point in time after the first and second substrates are opposed to a point in time when the adhesive layer is hardened, the first and second substrates are attached to the first and second substrates by a predetermined magnetic force source. A color electroluminescent display device which generates a magnetic force for applying a force acting in a direction approaching the color electroluminescent display device.