TW201347259A - Display device - Google Patents

Abstract

This invention provides a display device which even in the use of a nozzle printing device includes a plurality of nozzles, also can suppress an occurrence of periodic streak unevenness. The display device comprises: a supporting substrate; a plurality of organic electroluminescence elements which are respectively placed at a predetermined interval in second direction on the supporting substrate; an insulating film provided on the supporting substrate, having openings in the position corresponding to the plurality of organic electroluminescence elements, and respectively defining each of the organic electroluminescence elements via the opening; and a partition wall which is constituted by a plurality of partition wall members; in the display device, if a reference opening which has a specific area being provided at the center between the adjacent partition wall members, is virtually set, the center in second direction of the each opening is offset from that of the reference opening, and/or a area of the each opening is different from that of the reference opening; the degree of offset of the center in second direction of each opening and the degree of dissimilarity of the area of each opening are set at random.

Description

Display device

The present invention relates to a display device and a method of fabricating the same.

Display devices are available in a variety of styles. One of them is a display device using an organic electroluminescence element (hereinafter also referred to as "organic EL element") as a light source of a pixel. The display device includes a support substrate, a partition wall formed of a plurality of partition wall members 1 extending in the first direction X, and a partition wall member 1 disposed at equal intervals in the first direction along the first direction. A plurality of organic EL elements are formed (refer to Fig. 6).

The organic EL device is configured by sequentially laminating a first electrode, a functional layer of one or more layers, and a second electrode from the support substrate.

The functional layer of the organic EL element can be formed by a coating method. For example, the functional layer can be formed by supplying ink containing a material serving as the functional layer to a concave portion between the partition wall member 1 and the partition wall member 1, and curing the supplied ink. The supply of the ink is carried out, for example, by a nozzle printing method. After the functional layer is formed, the upper electrode is formed by a predetermined method, whereby a plurality of organic EL elements can be formed on the support substrate (see, for example, Patent Document 1).

Figure 6 is a schematic view showing the use of a plurality of nozzles The nozzle printing device is used to coat the pattern of the ink. The nozzle printing device is a plurality of nozzles 2 arranged at a predetermined interval in the arrangement arrangement direction (the direction Y perpendicular to the first direction in the pattern shown in Fig. 6). While ejecting ink from each of the nozzles 2, the nozzle 2 is scanned in one or the other of the first direction X (hereinafter referred to as "scanning direction X"), thereby supplying ink to the partition member 1 and borrowing the ink. The strip-shaped film 3 is formed by curing the ink. The strip-shaped film 3 of the number of the nozzles 2 is formed by one scanning of the nozzle 2. In the aspect shown in Fig. 6, the nozzle printing device has five nozzles, and five strip-shaped films 3 are formed by one scanning.

When the nozzle 2 is scanned from one end to the other end in the scanning direction X, the nozzle 2 is next moved to a direction perpendicular to the scanning direction X (hereinafter sometimes referred to as "coating direction Y"). One of the application directions Y may be referred to as "front" (lower in FIG. 6), and the other of the application direction Y may be referred to as "rear" (upward in FIG. 6). In the forward movement of the nozzle 2, the nozzle 2 is moved forward by a number of nozzles. In the aspect shown in Fig. 6, the nozzle 2 is moved by 5 columns. The ink can be applied between all the partition walls 1 by alternately repeating the movement of the nozzle 2 in the scanning direction X and the movement in the front direction of the coating direction Y.

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2009-119395

When a plurality of nozzles 2 are used to apply the ink, the properties of the coating film may exhibit periodicity. This period corresponds to the number of nozzles. For example, the film thickness of the coating film periodically changes in accordance with the number of nozzles. For the reason of this phenomenon, it is considered that there is a slight difference in the amount of ink discharged per nozzle. Even if the amount of ink discharged from each nozzle is set to the same amount, it is difficult to completely match the amount of ink actually discharged from each nozzle. Further, even if the respective nozzles are arranged at equal intervals, it is difficult to completely match the actual intervals of the respective nozzles. Therefore, it is also conceivable that the supply position of the ink between the partition members of the respective regions may be deviated in response to the respective nozzles, and the deviation may periodically appear on the properties of the coating film.

As described above, when the ink is supplied by using a nozzle printing device having a plurality of nozzles, the periodicity of the properties of the coating film is caused by the configuration or performance of the device, and so-called streak unevenness occurs. Such unevenness of the stripes is recognized as uneven illumination in the display device. In particular, when periodic uneven illumination is generated, since it is easily recognized by both eyes of human beings, there is a problem that display quality is lowered.

Accordingly, it is an object of the present invention to provide a display device capable of suppressing occurrence of periodic streak unevenness even when a nozzle printing apparatus having a plurality of nozzles is used.

The present invention provides the following [1] and [2].

[1] A display device comprising: a support substrate; and a plurality of organic EL elements, wherein the support substrate has a predetermined interval in a first direction and a second direction intersecting the first direction; The insulating film is provided on the support substrate and has an opening at a position corresponding to the plurality of organic EL elements, and each of the organic EL elements is individually defined by the opening; and the partition walls are provided in the foregoing a partition wall formed of a plurality of partition walls on the insulating film, and each partition member is disposed between the adjacent organic EL elements in the second direction, and is oriented at an equal interval in the second direction. a direction extending; wherein, in the display device, when a reference opening provided at a center between adjacent partition member members and having a specific area is virtually set, the openings are offset from the reference opening in the center of the second direction The center of the second direction and/or the area of each of the openings is different from the area of the reference opening; the degree of deviation of the openings in the center of the second direction and the degree of difference in area are randomly set.

[2] A method of manufacturing a display device comprising: a support substrate; and a plurality of organic EL elements, wherein the support substrate has a first direction and a second direction intersecting the first direction The insulating film is disposed on the support substrate and has an opening at a position corresponding to the plurality of organic EL elements, and each of the organic EL elements is individually defined by the opening; and the partition walls are a partition wall formed of a plurality of partition members provided on the insulating film, and each partition member is disposed between the adjacent organic EL elements in the second direction, and is spaced apart from each other in the second direction. Extending in the first direction; in the manufacturing method of the display device, a process of providing a pixel electrode provided with the plurality of organic EL elements and a support substrate having an insulating film having an opening at a position corresponding to the pixel electrode; and providing a partition wall by forming a plurality of partition walls on the insulating film a process of supplying ink to a region between the partition walls member by a nozzle printing method and curing the ink, thereby forming a functional layer of the organic EL element on the pixel electrode; and forming an upper electrode on the foregoing In the process of preparing the support substrate, in the process of preparing the support substrate, the following support substrate is prepared: when the reference opening disposed in the center between the partition members of the adjacent regions and having a specific area is virtually set, the aforementioned openings The center of the second direction is offset from the center of the reference opening in the second direction, and/or the area of each of the openings is different from the area of the reference opening, and the degree of deviation and area of each of the openings in the center of the second direction The degree of difference is set randomly.

According to the present invention, there is provided a display device capable of suppressing occurrence of periodic streak unevenness even when a nozzle printing apparatus including a plurality of nozzles is used.

1‧‧‧ separable members

2‧‧‧ nozzle

3‧‧‧film

11‧‧‧Support substrate

12‧‧‧pixel electrode

13‧‧‧ hole injection layer

14‧‧‧Lighting layer

15‧‧‧Insulation film

16‧‧‧Upper electrode

17‧‧‧ next door

18‧‧‧ recess

20‧‧‧ separable members

21‧‧‧Lighting device

22‧‧‧Organic EL components

22B‧‧‧Multiple organic EL elements of blue light

22G‧‧‧Multiple organic EL components of green light

22R‧‧‧Multiple organic EL elements in red light

Fig. 1 is a plan view schematically showing a light-emitting device 21 according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view showing the light-emitting device 21 in an enlarged manner.

Fig. 3 is a plan view showing the shape of an insulating film, a functional layer, and the like in an exaggerated manner in the cross section of the light-emitting device 21.

Fig. 4 is a view showing the film of the functional layer at the center of the opening with respect to the position of the opening in the second direction when the degree of the difference in the area (?S) and the degree of deviation from the center (?L) in the second direction are randomly set. Thick curve chart.

Fig. 5 is a view showing a functional layer of the center of the opening with respect to the position of the opening in the second direction when the degree of difference in area (?S) and the degree of deviation from the center (?L) in the second direction are set to zero. The curve of the film thickness.

Fig. 6 is a view schematically showing a state in which an ink is applied using a nozzle printing device having a plurality of nozzles.

Fig. 7 is a plan view showing a part of the light-emitting device 21 shown in Fig. 1 in an enlarged manner.

The display device of the present invention includes: a support substrate; and a plurality of organic EL elements arranged on the support substrate at a predetermined interval in a first direction and a second direction intersecting the first direction; and an insulating film; Provided on the support substrate, having openings at positions corresponding to the plurality of organic EL elements, and individually defining the organic EL elements by the openings; and the partition walls are provided on the insulating film a partition wall formed by a plurality of partition members, wherein each partition member is disposed between the adjacent organic EL elements in the second direction, and extends in the first direction at equal intervals in the second direction; In the display device, when the partition member disposed adjacent to the area is virtually set When the center has a reference opening of a specific area, the openings may be offset from the center of the reference opening in the second direction in the center of the second direction, and/or the area of each of the openings may be different from the area of the reference opening; The degree of deviation in the center of the second direction and the degree of difference in area are randomly set.

The display device mainly includes an active matrix drive type device and a passive matrix drive type device. Although the present invention can be applied to the two types of driving devices of the above-described driving type, in the present embodiment, the light-emitting device will be described by taking an active matrix driving type display device as an example.

<Configuration of Light Emitting Device>

First, the configuration of the light-emitting device will be described. Fig. 1 is a plan view schematically showing a light-emitting device 21 according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view showing the light-emitting device 21 in an enlarged manner. The light-emitting device 21 mainly includes a support substrate 11 and a plurality of organic EL elements 22 provided on the support substrate 11.

In the present embodiment, the plurality of organic EL elements 22 are arranged on the support substrate 11, and are arranged in a matrix in a first direction X and a second direction Y orthogonal to the first direction X, respectively, with a predetermined interval therebetween. In the present embodiment, the organic EL elements 22 are arranged at equal intervals in the first direction X.

In the present embodiment, the first direction X and the second direction Y are perpendicular to the thickness direction Z of the support substrate 11, respectively. Further, in the present embodiment, the first direction X and the second direction Y are perpendicular to each other. Hereinafter, the thickness direction Z of the support substrate 11 may be simply referred to as the thickness direction Z.

Individual provisions are provided on the support substrate 11 The insulating film 15 of the EL element 22 of the machine. This insulating film 15 has an opening at a position corresponding to the plurality of organic EL elements. Each of the organic EL elements 22 is provided at a position corresponding to the opening of the insulating film 15 when viewed from one of the thickness directions Z (hereinafter also referred to as "plan view"). That is, the position at which the opening is provided in a plan view corresponds to the position at which the organic EL element is provided. As will be described later, the functional layer constituting the organic EL element is formed to be physically connected to the organic EL element 22 adjacent to the first direction X. However, the organic EL element 22 adjacent in the first direction X is electrically insulated by the insulating film 15.

Since the opening of the insulating film 15 is formed at a position corresponding to the organic EL element 22, in the present embodiment, the openings are arranged in the same manner as the organic EL element 22. Thus, the insulating film 15 has a matrix-shaped opening. In other words, the insulating film 15 is formed in a checkered shape when viewed in a plan view. The opening of the insulating film 15 is formed to substantially coincide with the pixel electrode 12 to be described later in a plan view, and is formed, for example, into a substantially rectangular shape, a substantially circular shape, a substantially elliptical shape, or the like. The checkered insulating film 15 is mainly formed in a region other than the pixel electrode 12 in a plan view, and a part thereof is formed to cover the periphery of the pixel electrode 12.

In the present embodiment, the partition wall 17 composed of a plurality of partition walls 20 is provided on the insulating film 15. Each of the partition members 20 is disposed between the organic EL elements adjacent in the second direction Y. Further, the partition member 20 in this region is disposed at equal intervals in the second direction Y. As described above, in the present embodiment, the elongated partition walls 17 are provided on the insulating film 15.

The organic EL element 22 is disposed in a partition defined by the partition wall 17. In the present embodiment, the plurality of organic EL elements 22 are provided in a region between the partition wall members 20 adjacent to each other in the second direction Y (that is, the concave portion 18), and in the region between the partition wall members 20, in the first direction X is configured with a predetermined interval. Each of the organic EL elements 22 does not need to be physically separated, as long as it can be individually driven to form electrical insulation. Therefore, the layer (electrode or functional layer) constituting one part of the organic EL element can also be physically connected to other organic EL elements.

In the present embodiment, the organic EL element 22 is configured by sequentially arranging the first electrode 12, the functional layers 13, 14 and the second electrode 16 from the support substrate 11. In the present specification, the first electrode 12 is referred to as a pixel electrode 12, and the second electrode 16 is referred to as an upper electrode 16.

The pixel electrode 12 and the upper electrode 16 constitute a pair of electrodes composed of an anode and a cathode. That is, one of the pixel electrode 12 and the upper electrode 16 is an anode, and the other is a cathode. Further, the pixel electrode 12 is disposed close to the support substrate 11 , and the upper electrode 16 is disposed farther from the support substrate 11 than the pixel electrode 12 .

The organic EL element 22 is provided with one or more functional layers. In the present specification, the functional layer means all the layers sandwiched by the pixel electrode 12 and the upper electrode 16. The organic EL element 22 includes at least one or more light emitting layers as a functional layer. Further, the electrodes are not limited to the light-emitting layer, and a predetermined layer may be provided as needed. Examples of the functional layer provided between the anode and the light-emitting layer include a hole injection layer, a hole transport layer, and an electron blocking layer. In addition, the functional layer is provided between the light-emitting layer and the cathode. For example, a hole blocking layer, an electron transporting layer, an electron injecting layer, etc. are mentioned.

In the organic EL element 22 of the present embodiment, a hole injection layer 13 is provided as a functional layer between the pixel electrode 12 and the light-emitting layer 14.

Hereinafter, as an embodiment of the present invention, an organic EL including a pixel electrode 12 having a function of an anode, a hole injection layer 13, a light-emitting layer 14, and a functional upper electrode 16 having a cathode from the support substrate 11 will be described. Element 22.

The light-emitting device 21 of the present embodiment is an active matrix drive type device, and since the organic EL elements 22 can be individually driven, the pixel electrodes 12 are individually provided for the respective organic EL elements 22. That is, the pixel electrode 12 having the same number as that of the organic EL element 22 is provided on the support substrate 11. For example, the pixel electrode 12 has a film shape and is formed in a substantially rectangular shape in plan view. The plurality of pixel electrodes 12 are arranged in a matrix on the support substrate 11 corresponding to the positions at which the respective organic EL elements are provided. The plurality of pixel electrodes 12 are arranged at a predetermined interval in the first direction X and at a predetermined interval in the second direction Y. The pixel electrode 12 is provided in a region between the partition wall members 20 adjacent to each other in the second direction Y in a plan view, and is disposed between the partition walls 20 in a predetermined direction at a predetermined interval.

As described above, the checkered insulating film 15 is mainly formed in a region other than the pixel electrode 12 in a plan view, and a part thereof is formed to cover the periphery of the pixel electrode 12. That is, an opening is formed in the insulating film 15 at a position corresponding to the pixel electrode 12, and the surface of the pixel electrode 12 is exposed from the insulating film 15 by the opening.

The hole injection layer 13 is a region that is disposed in the first direction X and is disposed between the partition walls 20 . In other words, the hole injection layer 13 is formed in a strip shape by the concave portion 18 partitioned by the partition wall member 20 adjacent to the second direction Y, and is adjacent to the organic EL element 22 adjacent in the first direction X. The manner is continuously formed.

The light-emitting layer 14 is a region that is disposed to extend between the partition wall members 20 in the first direction X. In other words, the light-emitting layer 14 is formed in a strip shape by the concave portion 18 partitioned by the partition wall member 20 adjacent to the second direction Y, and is continuous in the manner of traversing the organic EL elements adjacent in the first direction X. Ground formation. The strip-shaped light-emitting layer 14 is laminated on the strip-shaped hole injection layer 13.

The present invention is also applicable to a monochrome display device. However, in the present embodiment, a color display device will be described as an example. In the case of a color display device, three kinds of organic EL elements that emit light of any one of red, green, and blue are provided on the support substrate 11. The color display device can be realized, for example, by repeatedly arranging the following columns (I), (II), and (III) in the second direction Y.

(I) A plurality of organic EL elements 22R in which red light is emitted are arranged in a predetermined interval in the first direction X.

(II) In the first direction X, a plurality of organic EL elements 22G emitting green light are arranged at predetermined intervals.

(III) In the first direction X, a plurality of organic EL elements 22B emitting blue light are arranged at predetermined intervals.

When three kinds of organic EL elements having different luminescent colors are formed in this way In the case of a device, a light-emitting layer having a different luminescent color is usually provided depending on the type of the component. In the present embodiment, the following columns (i), (ii), and (iii) are sequentially arranged in the second direction Y.

(i) A column of the light-emitting layers 14R that emit red light is provided.

(ii) A column in which the light-emitting layer 14G that emits green light is provided.

(iii) A column in which the light-emitting layer 14B that emits blue light is provided.

At this time, the three types of light-emitting layers 14R, 14G, and 14B extending in the first direction X are sequentially laminated on the hole injection layer 13 in the second direction Y at intervals of two columns.

The upper electrode 16 is disposed on the light emitting layer 14. In the present embodiment, the upper electrode 16 is formed continuously across a plurality of organic EL elements 22, and a common electrode as a plurality of organic EL elements is provided. The upper electrode 16 is formed not only on the light-emitting layer 14, but also on the partition wall 17, and is formed on one surface such that the electrode on the light-emitting layer 14 is connected to the electrode on the partition wall 17.

Fig. 3 is a view showing the shape of an insulating film, a functional layer, and the like in an exaggerated manner in the cross section of the light-emitting device 21. In the third drawing, the illustration of the pixel electrode 12 and the upper electrode 16 is omitted for easy understanding.

In the present embodiment, when the reference opening provided in the center between the partition members adjacent to each other in the second direction and having a specific area is virtually set, the respective openings are offset from the reference opening in the center of the second direction. The center of the two directions, and/or the area of each of the aforementioned openings, may be different from the area of the reference opening.

As described above, in the present embodiment, the partition wall member 20 The interval p in the second direction Y is equal intervals, but the area and/or position of the plurality of openings formed in the insulating film 15 differ depending on the organic EL element.

In the present embodiment, the reference opening is virtually set. The area at the time of viewing the reference opening in plan view is S _o . Further, the reference opening is virtually set at a position in the center of the second direction Y at a position in the second direction Y between the partition wall member 20 facing the opening. The reference opening that is virtually set is equivalent to, for example, an opening set in the design of a general display device.

Hereinafter, the area of the specific opening that is arbitrary in the plurality of openings is described as S, and the difference "S _o -S" between the area of the reference opening and the area of the specific opening is described as ΔS. When the area S of the specific opening is larger than the area S _{o of the} reference opening, ΔS is a positive value, and conversely, when the area S of the specific opening is smaller than the area S _{o of the} reference opening, ΔS is a negative value.

Further, when the center position in the second direction Y between the opposing partition members 20 is 0, the center position O corresponds to the center position of the reference opening in the second direction Y. When the center position O is used as a reference, the deviation of the specific opening in the center position L of the second direction Y is referred to as ΔL. With respect to the center position O, when the center position L is shifted to one of the second directions Y, ΔL is a positive value, and conversely, with respect to the center position O, the center position L is shifted to the other of the second direction Y. When ΔL is a negative value.

In the present invention, the "deviation ΔL" of the opening in the center (position) of the second direction Y will be described with reference to Fig. 7. Fig. 7 is a plan view showing a part of the light-emitting device 21 shown in Fig. 1 in an enlarged manner, showing openings 12a, 12b, and 12c provided between the partition members 20 adjacent to each other in the second direction Y. Here, when focusing on the opening 12b, the center (position) of the opening 12b in the second direction Y is indicated by the single-dot chain line _12b . Further, Fig. 7 shows a reference opening 12r having a specific area provided at the center between the partition wall members 20 adjacent to each other in the second direction Y. The reference opening 12r is virtually set as previously described. The center (position) of the reference opening 12r in the second direction Y corresponds to the center (position) between the partition walls 20 adjacent to each other in the second direction Y, and is shown by the double dotted line l _12r in Fig. 7 . Then, the "deviation ΔL" at the center (position) of the opening in the second direction Y indicates the distance between the single-dot chain line _12b and the double-dot chain line _l12r .

In the present embodiment, the degree of deviation of each opening in the center of the second direction Y and the degree of difference in area are randomly set. That is, in the present embodiment, ΔS and/or ΔL are randomly set for each different opening.

For example, when a random number from 0 to 1 is generated, when the value is "ran", the area S of each opening is set to satisfy the following expression.

S=S _o +(ran-0.5)×A×S _o

Here, the symbol "A" is 0.02 to 0.2, preferably 0.03 to 0.07. Further, ΔL is expressed by the following expression when the pitch of the partition wall member 20 provided at equal intervals in the second direction Y is p.

△L=(ran-0.5)×B×p

Here, the symbol "B" is 0.02 to 0.2, preferably 0.03 to 0.07. "ran" means the same meaning as described above.

The chaotic system can be produced, for example, according to the Mersenne Twister method. Health.

The area of the opening and the position of the opening affect the film thickness of the functional layer at the center position L of the opening in the second direction Y. For example, when the area of the opening is increased, the film thickness of the functional layer is thinned, and conversely, when the area of the opening is reduced, the film thickness of the functional layer is increased. Further, when the center position L of the opening in the second direction Y is deviated from the center position O, the film thickness of the functional layer in the center position of the opening in the second direction Y changes.

Therefore, when ΔL and ΔS are randomly set, the film thickness of the functional layer whose opening is at the center position in the second direction Y fluctuates randomly. That is, the film thickness of the functional layer varies randomly depending on the organic EL device. As described in the prior art, when the ink is applied using a nozzle printing apparatus having a plurality of nozzles, periodicity is exhibited in the film thickness of the formed film. On the other hand, when ΔS and ΔL are randomly set as in the present embodiment, the film thickness of the functional layer can be randomly changed for different organic EL elements. Therefore, in the present embodiment, the periodicity of the film thickness of the functional layer can be alleviated.

Fig. 4 is a graph showing the calculation result of the film thickness of the functional layer at the center of the opening when ΔS and ΔL are randomly set, and Fig. 5 shows that when ΔS and ΔL are set to zero, The image of the film thickness of the functional layer at the center of the opening is curved. In Figs. 4 and 5, the horizontal axis of the graph shows the position of the opening in the second direction (coating direction). In addition, in FIGS. 4 and 5, both of them are obtained by applying an ink to a nozzle printing apparatus having eight nozzles.

In Fig. 5, the number of nozzles (8) is used as the cycle. The film thickness remarkably exhibits periodicity, but in Fig. 4, the film thickness does not show such periodicity. Therefore, by virtually setting ΔS and ΔL to the respective openings, it is understood that the periodicity of the film thickness can be alleviated.

In the unevenness of the stripes, if it is particularly periodic, it is more easily detected by the human eyes, but by moderate the periodicity as described above, the degree of unevenness of the stripes can be reduced and improved. As the display quality of the display device.

<Method of Manufacturing Light Emitting Device>

Next, a method of manufacturing the light-emitting device will be described.

A method of manufacturing a light-emitting device according to the present invention is directed to a method of manufacturing a display device comprising: a support substrate; and a plurality of organic EL elements on the support substrate in a first direction and the first direction The second direction of the intersection is disposed at a predetermined interval, and the insulating film is provided on the support substrate, and has an opening at a position corresponding to the plurality of organic EL elements, and each of the organic EL elements is individually defined by the opening. And the partition wall is a partition wall composed of a plurality of partition wall members provided on the insulating film, and each partition member is disposed between the adjacent organic EL elements in the second direction, and The second direction extends in the first direction at equal intervals, and the method of manufacturing the display device includes: preparing a pixel electrode in which the plurality of organic EL elements are provided, and ii) corresponding to the pixel electrode; a process of supporting a substrate having an opening insulating film; a process of providing a partition wall by forming a plurality of partition walls on the insulating film; printing by nozzle The ink is supplied to the area between the partition member and the ink is cured, whereby a process of forming a functional layer of the organic EL element on the pixel electrode; and a process of forming an upper electrode on the functional layer; in the process of preparing the support substrate, preparing a support substrate: when virtually set When the reference opening is provided in the center between the adjacent partition members and has a specific area, the openings may be offset from the center of the reference opening in the second direction in the center of the second direction, and/or the area of each of the openings may be The area of the reference opening is different from the area of the reference opening, and the degree of deviation of each of the openings in the center of the second direction and the degree of difference in area are randomly set.

(Preparation process for preparing the substrate)

In the present process, the pixel electrode 12 of i) a plurality of organic EL elements and ii) the support substrate 11 having the insulating film 15 having an opening at a position corresponding to the pixel electrode 12 are provided. In the case of an active matrix drive type display device, a substrate on which a circuit for individually driving a plurality of organic EL elements is formed in advance can be used as the support substrate 11. For example, a substrate on which a TFT (Thin Film Transistor), a capacitor, or the like is formed in advance can be used as a support substrate. Then, the pixel electrode 12 and the insulating film 15 are formed by the present process as described below, whereby the support substrate 11 on which the pixel electrode 12 and the insulating film 15 are provided is prepared. Alternatively, the support substrate 11 on which the pixel electrode 12 and the insulating film 15 are provided in advance is not commercially available, and the support substrate 11 is not prepared.

First, a plurality of pixel electrodes 12 are formed in a matrix on the support substrate 11. The pixel electrode 12 can be formed, for example, by forming a conductive film on one side of the support substrate 11 and patterning the conductive film film into a matrix by a lithography technique. In addition, for example, it can be formed at a predetermined location The mask having an opening is disposed on the support substrate 11, and the conductive material is selectively deposited on a predetermined portion of the support substrate 11 via the mask, whereby the pixel electrode 12 is patterned. The material of the pixel electrode 12 will be described in detail later.

As described above, the respective opening areas and/or positions of the insulating film 15 are randomly changed by ΔS and ΔL with respect to the reference opening. The pixel electrode 12 is formed corresponding to the opening size and position of the insulating film 15 so that the peripheral edge of the pixel electrode 12 is covered with an insulating film.

Next, a checkered insulating film 15 is formed on the support substrate 11. In the present process, when the reference opening provided in the center between the partition wall members 20 adjacent to the second direction Y and having a specific area is virtually formed, the openings are in the second direction. The center of Y is offset from the center of the reference opening in the second direction, and the area of each of the openings is different from the area of the reference opening, and the degree of deviation of the openings in the center of the second direction and the degree of the difference in area It is set randomly. That is, the insulating film 15 in which the above ΔS and/or ΔL are randomly set for each different opening is formed.

The insulating film 15 is made of an organic substance or an inorganic substance. Examples of the organic material constituting the insulating film 15 include resins such as an acrylic resin, a phenol resin, and a polyimide resin. In addition, examples of the inorganic material constituting the insulating film 15 include SiO _x and SiN _x .

When the insulating film 15 made of an inorganic material is formed, for example, a film made of an inorganic material can be formed on one surface by a plasma CVD method or a sputtering method, and then a predetermined portion can be removed to form a checkered insulating film. 15. The removal of a predetermined portion can be performed, for example, by a lithography technique.

When the insulating film 15 made of an organic material is formed, first, for example, a positive or negative photosensitive resin can be applied to one surface, and a predetermined portion can be exposed and developed. Then, the photosensitive resin is cured to thereby form a checkered insulating film 15. A photoresist can be used for the photosensitive resin.

A partition wall 17 is then formed. That is, a plurality of the partition wall members 20 are formed on the insulating film 15 to provide the partition walls 17. In the present process, a plurality of the partition wall members 20 are formed at equal intervals in the second direction Y, and the partition walls 17 composed of the plurality of partition wall members 20 are formed.

The partition wall 17 is, for example, a material exemplified as the material of the insulating film 15, and is formed into a strip shape by the same method as the method of forming the insulating film 15.

The partition wall 17 is preferably made of an organic substance. In order to hold the ink supplied to the concave portion 18 surrounded by the partition wall 17 in the concave portion 18, the partition wall preferably exhibits liquid repellency. In general, the organic substance exhibits liquid repellency to the ink more than the inorganic substance, so that the partition wall can be formed by the organic substance, and the ability to hold the ink in the concave portion 18 can be improved.

The shape of the partition wall 17 and the arrangement are appropriately set in accordance with the specifications of the display device such as the number of pixels and the resolution, the ease of manufacture, and the like. For example, the width L1 of the partition wall member 20 in the second direction Y is about 5 μm to 50 μm, the height L2 of the partition wall member 20 in the second direction Y is about 0.5 μm to 5 μm, and the width L3 of the recess 18 in the second direction Y is From about 10 μm to about 200 μm. In addition, the pixel electrode 12 is in the first direction The widths of X and the second direction Y are each about 10 μm to 400 μm.

(Process for forming a functional layer)

In the present process, a predetermined ink is supplied to a region between the partition walls by a nozzle printing method to cure the ink, and a functional layer of the organic EL element is formed on the pixel electrode. The predetermined ink is an ink containing a material which becomes a functional layer (in the present embodiment, a hole injection layer and a light-emitting layer). In the present process, when a functional layer of a plurality of layers is provided, at least one layer is formed by a nozzle printing method.

In the present embodiment, the hole injection layer 13 which is common to all the organic EL elements is formed. In the present embodiment, the ink for the hole injection layer is supplied by the nozzle printing method as a coating method for selectively supplying the ink for the hole injection layer.

The process will be described below with reference to Fig. 6. Fig. 6 is a view schematically showing the action when the ink is applied by the nozzle printing method. In the sixth embodiment, the display device described in the item of the present invention and the display device described in the item to be solved by the invention are opened, similar to the drawings cited in the item to be solved by the invention. The size (area) and/or configuration (center position in the 2nd direction) are different.

In the nozzle printing method, the hole injection layer ink is supplied to each row (each concave portion 18) by a single discharge method. In other words, the nozzle 2 is moved back and forth in the first direction X while maintaining the ink for the hole injection layer having a columnar discharge from the nozzle disposed above the support substrate 11. Then, when the nozzle 2 moves back and forth, the support substrate is moved in the second direction Y by a predetermined distance, thereby supplying the hole injection layer with ink to each Column. For example, when the nozzle 2 is moved back and forth, the hole for the hole injection layer can be supplied to all the rows by moving the support substrate in the second direction Y by the same number of rows as the number of nozzles. Further, the nozzle 2 may be moved in the second direction Y instead of moving the support substrate 11 in the second direction Y.

Specifically, in the state in which the ink for the hole injection layer in which the liquid column is discharged from the nozzle 2 is maintained, the following processes (1) to (4) can be repeatedly performed in order to supply the ink for the hole injection layer. The area (concave portion 18) to the partition member 20 in all the regions.

(1) A process of moving the nozzle 2 from one end of the first direction X to the other end.

(2) A process of moving the support substrate 11 to one of the second direction Y to the same number of columns as the number of nozzles.

(3) A process of moving the nozzle 2 from the other end of the first direction X to one end.

(4) A process of moving the support substrate to one of the second directions Y to the same number of columns as the number of nozzles.

As described above, the ink for the hole injection layer is supplied by the nozzle printing method to form a film made of the ink for the hole injection layer.

As described above, in the present embodiment, the degree of deviation of the openings in the center of the second direction and the degree of difference in the area are randomly set. By providing such an opening, even if the ink is applied by the inkjet printing method, as shown in FIG. 4, the periodicity of the film thickness of the functional layer formed in the region between the partition members 20 can be alleviated.

(Process for forming a light-emitting layer)

A light-emitting layer is then formed. As described above, when a color display device is produced, it is necessary to produce three kinds of organic EL elements. Therefore, it is necessary to distinguish the materials of the coating layer by each column. For example, when three kinds of light-emitting layers are formed for each column, it is necessary to apply a red ink containing a material that emits red light, a green ink containing a material that emits green light, and a second row in the second direction Y, respectively. A blue ink containing a material that emits blue light. Each of the light-emitting layers can be applied as a film by sequentially applying these red inks, green inks, and blue inks in a predetermined column.

The method of sequentially applying the red ink, the green ink, and the blue ink in a predetermined column may be any method as long as it is a coating method that can selectively supply the ink to a region between the partition members. For example, the ink can be supplied by an inkjet printing method, a nozzle printing method, a letterpress printing method, a gravure printing method, or the like. The method of supplying the ink is preferably a method of uniformly supplying the ink in a short time, and from this viewpoint, a nozzle printing method is preferred. In the present embodiment, as in the method of forming the hole injection layer described above, the ink is supplied by the nozzle printing method.

More specifically, in the state in which the liquid ink in the columnar state of the liquid is ejected from the nozzle 2, the following processes (1) to (4) can be repeatedly performed in this order, whereby the second direction Y is separated by two columns. At intervals, the red ink is supplied to the region (concave portion 18) between the partition members.

(1) A process of moving the nozzle 2 from one end of the first direction X to the other end.

(2) A process of moving the support substrate 11 to one of the second directions Y up to the number of nozzles × 3 columns.

(3) A process of moving the nozzle 2 from the other end of the first direction X to one end.

(4) The process of moving the support substrate 11 to one of the second directions Y up to the number of nozzles × 3 columns.

The green ink and the blue ink are supplied in the same manner as the above-described red ink, whereby the green ink and the blue ink are supplied between the partition walls 20 (the recesses 18) in the second direction Y at intervals of two rows.

The luminescent materials used for the red ink, the green ink, and the blue ink will be described later. Each of the inks may also contain a polymerizable compound which can be polymerized by application of energy. The ink can also be used as a red ink, a green ink, or a blue ink containing a luminescent material having a polymerizable group polymerizable by application of energy as a polymerizable compound. Further, a red ink, a green ink, or a blue ink containing a light-emitting material which does not polymerize itself and a polymerizable compound having a polymerizable polymerizable group in addition to the light-emitting material may be used.

Examples of the polymerizable group include a vinyl group, an ethynyl group, a butenyl group, an acrylonitrile group, an acrylamide group, a methacryloyl group, a methacrylamido group, a vinyloxy group, a vinylamine group, and the like. A sterol group, a cyclopropyl group, a cyclobutyl group, an epoxy group, an oxetanyl group, a diketenyl group, an epithio group, a lactone group, an indolyl group, and the like.

Further, examples of the polymerizable compound include a derivative of PDA (N,N'-tetraphenyl-1,4-phenylenediamine) having a polymerizable group, and a TPD (N, N having a polymerizable group). a derivative of '-bis(3-methylphenyl)-N,N'-bis(phenyl)-benzidine), a polymerizable group NPD (N,N'-bis(naphthalene-1-) Derivatives of -N,N'-bis(phenyl)-benzidine, triphenylamine acrylate, triphenyldiamine acrylate, phenyl acrylate, bis(phenoxyethanol) ruthenium diacrylate (Osaka Gas Chemical company, trade name BPEF-A), dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd., trade name KAYARD DPHA), tripentaerythritol octaacrylate (manufactured by Kwong Wing Chemical Co., Ltd.), 1, 4-butanediol diacrylate (manufactured by Alfa Aesar Co., Ltd.), Aron Oxetane (OXT 121; cross-linking agent manufactured by Toagosei Co., Ltd.), etc., among these, phenyl decyl acrylate is preferable.

As described above, in the present embodiment, the degree of deviation of the openings in the center of the second direction and the degree of difference in the area are randomly set. By providing such an opening, even if the ink is applied by the inkjet printing method, as shown in FIG. 4, the periodicity of the film thickness of the film formed between the partition members 20 in each region can be alleviated.

After the light-emitting layer is formed, a predetermined organic layer, inorganic layer, or the like can be formed by a predetermined method as needed. These can be formed by a predetermined coating method such as a printing method, an inkjet method, a nozzle printing method, or even a predetermined dry method.

(Process for forming the upper electrode)

An upper electrode is then formed. As described above, in the present embodiment, the upper electrode is formed on the entire surface of the support substrate. Thereby, a plurality of organic EL elements can be formed on the substrate.

As described above, in the present embodiment, the degree of deviation of the openings in the center of the second direction and the degree of difference in the area are randomly set. By setting such an opening, even by inkjet printing As shown in Fig. 4, the cloth ink can also moderate the periodicity of the film thickness of the hole injection layer and the light-emitting layer in the region formed between the partition members 20 in the respective regions.

In the unevenness of the stripes, if it has a periodicity, it is more easily detected by the human eyes, but by moderate the periodicity as described above, the degree of unevenness of the stripes can be reduced, and the display can be improved as a display. The display quality of the device.

<Configuration of Organic EL Element>

As described above, the organic EL element can be formed in various layers, but the layer structure of the organic EL element, the structure of each layer, and the method of forming each layer will be described in more detail below.

As described above, the organic EL element includes one pair of electrodes (pixel electrode and upper electrode) composed of an anode and a cathode, and one or a plurality of functional layers provided between the electrodes, and has at least one layer. The luminescent layer serves as a layer of 1 or a plurality of layers. The organic EL device may also contain a layer containing an inorganic substance and an organic substance, an inorganic layer, or the like. The organic substance constituting the organic layer may be any of a low molecular compound, a high molecular compound, or a mixture of a low molecular compound and a high molecular compound. The organic layer preferably contains a polymer compound, and a compound having a number average molecular weight of 10 ³ to 10 ⁸ in terms of polystyrene is preferably used as the polymer compound.

Examples of the functional layer provided between the cathode and the light-emitting layer include an electron injection layer, an electron transport layer, a hole blocking layer, and the like. When a layer of both the electron injecting layer and the electron transporting layer is disposed between the cathode and the light emitting layer, a layer close to the cathode is referred to as an electron injecting layer, which is close to the light emitting layer. The layer is called the electron transport layer. Examples of the functional layer provided between the anode and the light-emitting layer include a hole injection layer, a hole transport layer, and an electron blocking layer. When both the hole injection layer and the hole transport layer are provided, a layer close to the anode is referred to as a hole injection layer, and a layer close to the light-emitting layer is referred to as a hole transport layer.

An example of the layer configuration that the organic EL device of the present embodiment can take is shown below.

a) anode / luminescent layer / cathode

b) anode / hole injection layer / luminescent layer / cathode

c) anode / hole injection layer / luminescent layer / electron injection layer / cathode

d) anode / hole injection layer / luminescent layer / electron transport layer / cathode

e) anode/hole injection layer/light-emitting layer/electron transport layer/electron injection layer/cathode

f) anode / hole transport layer / luminescent layer / cathode

g) anode / hole transport layer / luminescent layer / electron injection layer / cathode

h) anode / hole transport layer / luminescent layer / electron transport layer / cathode

i) anode / hole transport layer / luminescent layer / electron transport layer / electron injection layer / cathode

j) anode/hole injection layer/hole transport layer/light-emitting layer/cathode

k) anode/hole injection layer/hole transport layer/light-emitting layer/electron injection layer/cathode

l) anode / hole injection layer / hole transport layer / luminescent layer / electron transport layer / cathode

m) anode/hole injection layer/hole transport layer/light-emitting layer/electron transport layer/ Electron injection layer/cathode

n) anode / luminescent layer / electron injection layer / cathode

o) anode / luminescent layer / electron transport layer / cathode

p) anode / luminescent layer / electron transport layer / electron injection layer / cathode

(Here, the symbol "/" indicates that each layer of the grip symbol "/" is adjacent and laminated. The same applies hereinafter.)

The organic EL device of the present embodiment may have two or more light-emitting layers. In any one of the layer configurations of the above-mentioned a) to p), when the laminated body sandwiched between the anode and the cathode is "structural unit A", an example of a configuration of an organic EL element having two light-emitting layers is used. The layer constitution shown in the following q) can be cited. The layer composition of two (structural unit A) may be the same or different from each other.

q) Anode / (structural unit A) / charge generation layer / (structural unit A) / cathode

In addition, when the "(structural unit A) / charge generation layer" is "structural unit B", the structure of the organic EL element having three or more light-emitting layers is as follows.

r) anode / (structural unit B) x / (structural unit A) / cathode

The symbol "x" indicates an integer of 2 or more, and (structural unit B) x indicates a laminated body in which the structural unit B is laminated by the x-segment. Further, the layer constitutions of a plurality of (structural unit B) may be the same or different from each other.

Here, the charge generation layer is a layer that generates holes and electrons by applying an electric field. The charge generating layer may, for example, be a film composed of vanadium oxide, indium tin oxide (ITO) or molybdenum oxide.

In the organic EL device, the anode may be disposed closer to the support substrate than the cathode and provided on the support substrate, or the cathode may be disposed closer to the support substrate than the anode and provided on the support substrate. For example, in the configuration of the above a) to r), the organic EL element may be formed by sequentially laminating each layer on the support substrate from the right side or by sequentially laminating each layer on the support substrate from the left side. The order of the layers, the number of layers, and the thickness of each layer can be appropriately set in consideration of luminous efficiency and element life.

Next, the materials constituting the respective layers of the organic EL element and the method of forming the same will be described more specifically.

<anode>

When the light emitted from the light-emitting layer is emitted through the anode to the organic EL element, the anode is an electrode that exhibits light transmittance. For the electrode exhibiting light transmittance, for example, a film of a metal oxide, a metal sulfide, or a metal can be used. Among them, a film having high electrical conductivity and high light transmittance is preferably used. Specifically, a film composed of indium oxide, zinc oxide, tin oxide, ITO, indium zinc oxide (Indium Zinc Oxide: abbreviated as IZO), gold, platinum, silver, copper, or the like can be used. A film composed of ITO, IZO, or tin oxide is preferably used.

Examples of the method for producing the anode include a vacuum deposition method, a sputtering method, an ion deposition method, and a plating method. Further, as the anode, an organic transparent conductive film of polyaniline or a derivative thereof, polythiophene or a derivative thereof, or the like can be used.

In terms of the film thickness of the anode, the required characteristics can be considered. And the ease of film formation process, etc. are set suitably. For example, it is 10 nm to 10 μm, preferably 20 nm to 1 μm, and more preferably 50 nm to 500 nm.

<cathode>

As the material of the cathode, a material having a small work function, easy electron injection into the light-emitting layer, and high electrical conductivity is preferable. Further, in the organic EL element which is configured to take light from the anode side, since the light from the light-emitting layer is reflected to the anode side at the cathode, the material of the cathode is preferably a material having a high reflectance with respect to visible light. . As the cathode system, for example, an alkali metal, an alkaline earth metal, a transition metal, a metal of Group 13 of the periodic table, or the like can be used. Examples of the material of the cathode include lithium, sodium, potassium, rubidium, cesium, cesium, magnesium, calcium, strontium, barium, aluminum, strontium, vanadium, zinc, bismuth, indium, antimony, bismuth, antimony, bismuth, a metal such as ruthenium; an alloy of two or more kinds of the above metals; an alloy of one or more of the above metals and one or more of gold, silver, platinum, copper, manganese, titanium, cobalt, nickel, tungsten, and tin; or It is a graphite or graphite intercalation compound. Examples of the alloy include a magnesium-silver alloy, a magnesium-indium alloy, a magnesium-aluminum alloy, an indium-silver alloy, a lithium-aluminum alloy, a lithium-magnesium alloy, a lithium-indium alloy, a calcium-aluminum alloy, and the like. Further, as the cathode, a transparent conductive electrode composed of a conductive metal oxide, a conductive organic substance or the like can be used. Specific examples of the conductive metal oxide include indium oxide, zinc oxide, tin oxide, ITO, and IZO, and examples of the conductive organic substance include polyaniline or a derivative thereof, and polythiophene or a derivative thereof. The cathode may be composed of a laminate having two or more layers. The electron injecting layer is sometimes used as a cathode.

The film thickness of the cathode can be appropriately set in consideration of the required characteristics and the ease of the film formation process, and the like, for example, 10 nm to 10 μm. It is preferably from 20 nm to 1 μm, more preferably from 50 nm to 500 nm.

Examples of the method for producing the cathode include a vacuum deposition method, a sputtering method, and a lamination method in which a metal thin film is heat-pressed.

<hole injection layer>

Examples of the hole injecting material constituting the hole injection layer include oxides of vanadium oxide, molybdenum oxide, cerium oxide, and aluminum oxide, or phenylamine compounds, starburst amine compounds, and phthalocyanines. Compounds, amorphous carbon, polyaniline, and polythiophene derivatives.

The film thickness of the hole injection layer can be appropriately set in consideration of the required characteristics and the ease of the film formation process, and the like, for example, is 1 nm to 1 μm, preferably 2 nm to 500 nm, and more preferably 5 nm to 200 nm.

<hole transport layer>

Examples of the hole transporting material constituting the hole transporting layer include polyvinylcarbazole or a derivative thereof, polydecane or a derivative thereof, and a polyoxyalkylene derivative having an aromatic amine in a side chain or a main chain. a pyrazoline derivative, an arylamine derivative, a stilbene derivative, a triphenylenediamine derivative, a polyaniline or a derivative thereof, a polythiophene or a derivative thereof, a polyarylamine or a derivative thereof, a polypyrrole or A derivative thereof, poly(p-benzoene) or a derivative thereof, or poly(2,5-thiopheneethylene) or a derivative thereof.

The film thickness of the hole transport layer can be appropriately set in consideration of desired characteristics, ease of film formation process, and the like, and is, for example, 1 nm to 1 μm, preferably 2 nm to 500 nm, and more preferably 5 nm to 200 nm.

<Light Emitting Layer>

The luminescent layer is typically formed primarily of an organic material that emits fluorescent and/or phosphorescent light, or a dopant that assists the organic material. The dopant is added, for example, to increase the luminous efficiency or to change the wavelength of the emission. The organic substance constituting the light-emitting layer may also be a low molecular compound or a high molecular compound. When the light-emitting layer is formed by a coating method, the light-emitting layer preferably contains a polymer compound. The polystyrene-equivalent number average molecular weight of the polymer compound constituting the light-emitting layer is, for example, about 10 ³ to 10 ⁸ . Examples of the light-emitting material constituting the light-emitting layer include the following pigment-based materials, metal-based compound materials, polymer-based materials, and dopant materials.

(pigmented material)

Examples of the pigment-based material include a 1-cyclopentyl-N-methylpropan-2-amine (cyclopentamine) derivative, a tetraphenylbutadiene derivative compound, and a triphenylamine derivative. Diazole derivatives, pyrazoloquinoline derivatives, stilbene benzene derivatives, stilbene extended aromatic derivatives, pyrrole derivatives, thiophene ring compounds, pyridine ring compounds, perinone derivatives, anthracene derivatives Oligothiophene derivative, An oxadiazole dimer, a pyrazoline dimer, a quinacridone derivative, a coumarin derivative or the like.

(metal complex material)

Examples of the metal complex-based material include a rare earth metal (Tb, Eu, Dy, etc.) or a metal such as Al, Zn, Be, Ir, or Pt as a center metal, and has a ligand at the ligand. A metal complex of an oxadiazole, a thiadiazole, a phenylpyridine, a phenylbenzimidazole, a quinoline structure or the like. Specific examples thereof include metal complexes having luminescence derived from triplet excitation, such as ruthenium complexes and platinum complexes, aluminum quinolinol complexes, and quinone quinolinol phenol complexes. Zinc benzo A azole complex, a zinc benzothiazole complex, a zinc azomethyl complex, a porphyrin-zinc complex, a phenanthroline-europium complex, and the like.

(polymer material)

Examples of the polymer-based material include polyparaphenylene ethylene derivative, polythiophene derivative, polyparaphenylene derivative, polydecane derivative, polyacetylene derivative, polyfluorene derivative, and polyethylene hydrazine. An azole derivative or a polymer material obtained by polymerizing the above-described dye-based material or metal-based luminescent material.

The thickness of the light-emitting layer is usually about 2 nm to 200 nm.

<Electronic transport layer>

As the electron transporting material constituting the electron transporting layer, generally known materials can be used, for example, An oxadiazole derivative, quinodimethane or a derivative thereof, benzoquinone or a derivative thereof, naphthoquinone or a derivative thereof, hydrazine or a derivative thereof, tetracyanoquinodimethane or a derivative thereof, anthrone derivative Or diphenyldicyanoethylene or a derivative thereof, a biphenyl hydrazine derivative, or a metal complex of 8-hydroxyquinoline or a derivative thereof, polyquinoline or a derivative thereof, polyquine Porphyrin or a derivative thereof, polyfluorene or a derivative thereof, and the like.

The film thickness of the electron transport layer can be appropriately set in consideration of the required characteristics and the ease of the film formation process, and the like, for example, is 1 nm to 1 μm, preferably 2 nm to 500 nm, and more preferably 5 nm to 200 nm.

<electron injection layer>

The material constituting the electron injecting layer can be appropriately selected according to the type of the light-emitting layer, and examples thereof include an alkali metal, an alkaline earth metal, and an alkali metal or an alkaline earth metal. Gold; oxides, halides, and carbonates of alkali or alkaline earth metals; and mixtures of such and the like. Examples of the alkali metal, the alkali metal oxide, the halide, and the carbonate include lithium, sodium, potassium, rubidium, cesium, lithium oxide, lithium fluoride, sodium oxide, sodium fluoride, and potassium oxide. Potassium fluoride, cerium oxide, cerium fluoride, cerium oxide, cerium fluoride, lithium carbonate, and the like. Further, examples of the alkaline earth metal, the oxide of the alkaline earth metal, the halide, and the carbonate include magnesium, calcium, barium, strontium, magnesium oxide, magnesium fluoride, calcium oxide, calcium fluoride, and oxidation. Antimony, barium fluoride, barium oxide, barium fluoride, magnesium carbonate, and the like. The electron injecting layer may be composed of a laminate having two or more layers, and examples thereof include LiF/Ca.

The thickness of the electron injecting layer is preferably about 1 nm to 1 μm.

When a plurality of functional layers which can be formed by a coating method are present in the functional layer, it is preferred to form all functional layers by a coating method. However, for example, at least one of a plurality of functional layers which can be formed by a coating method can be formed by a coating method, and another functional layer can be formed by a method different from the coating method. Further, even when a plurality of functional layers are formed by a coating method, a plurality of functional layers can be formed by a specific method for different coating methods. For example, in the present embodiment, the hole injection layer and the light-emitting layer are formed by a nozzle printing method. However, the hole injection layer may be formed by a spin coating method, and the light-emitting layer may be formed by a nozzle printing method.

In the coating method, an ink containing an organic EL material serving as each functional layer is applied to form a film to form a functional layer. For the solvent of the ink used at this time, for example, chloroform, methane chloride, or the like can be used. a chlorine-based solvent such as ethyl chloride; an ether solvent such as tetrahydrofuran; an aromatic hydrocarbon solvent such as toluene or xylene; a ketone solvent such as acetone or methyl ethyl ketone; ethyl acetate, butyl acetate, and ethyl acetate An ester solvent such as ethyl cellosolve acetate; and water.

Further, the functional layer may be formed by a method different from the coating method, and for example, the functional layer may be formed by a vacuum deposition method, a sputtering method, a CVD method, a lamination method, or the like.

12‧‧‧pixel electrode

17‧‧‧ next door

20‧‧‧ separable members

21‧‧‧Lighting device

22B‧‧‧Multiple organic EL elements of blue light

22G‧‧‧Multiple organic EL components of green light

22R‧‧‧Multiple organic EL elements in red light

Claims (2)

A display device includes: a support substrate; and a plurality of organic electroluminescence elements arranged on the support substrate at a predetermined interval in a first direction and a second direction intersecting the first direction; Provided on the support substrate, having openings at positions corresponding to the plurality of organic electroluminescent elements, and individually defining the respective organic electroluminescent elements by the openings; and the partition walls are provided by the foregoing a partition wall formed by a plurality of partition walls on the insulating film, and each partition member is disposed between the adjacent organic electroluminescent elements in the second direction, and is oriented at equal intervals in the second direction The first direction extends; in the display device, when the reference opening provided in the center between the partition members of the adjacent regions and having a specific area is virtually set, the openings are offset from the reference in the center of the second direction The opening is in the center of the second direction, and/or the area of each of the openings is different from the area of the reference opening; the degree of deviation of each of the openings in the center of the second direction and The degree of difference in area is set randomly. A method of manufacturing a display device comprising: a support substrate; and a plurality of organic electroluminescence elements, wherein the support substrate has a predetermined direction in a first direction and a second direction intersecting the first direction Arranged at intervals; an insulating film is disposed on the support substrate, Corresponding to the position of the plurality of organic electroluminescent elements, the openings are individually defined by the openings, and the partition walls are a plurality of partition members disposed on the insulating film. Each of the partition members is disposed between the organic electroluminescent elements adjacent to each other in the second direction, and extends in the first direction at equal intervals in the second direction; the display device The manufacturing method includes: a process of preparing a pixel electrode provided with i) the plurality of organic electroluminescent elements, and ii) a supporting substrate having an insulating film having an opening at a position corresponding to the pixel electrode; Forming a plurality of partition members on the membrane to form a partition wall; supplying ink to the region between the partition members by nozzle printing to cure the ink, thereby forming a functional layer of the organic electroluminescent device a process on the pixel electrode; and a process of forming an upper electrode on the functional layer; in the process of preparing the support substrate, the following is prepared The support substrate: when the reference opening provided in the center between the partition members of the adjacent regions and having a specific area is virtually set, the openings in the second direction are offset from the center of the reference opening in the second direction, and The area of each of the openings is different from the area of the reference opening, and the degree of deviation of the openings in the center of the second direction and the degree of difference in the area are randomly set.