JP2013206565A - Organic electroluminescent panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic electroluminescent panel which makes it possible to improve luminance in a front direction while preventing a view angle from becoming narrow, resulting in a thin structure and further to prevent a color shift from occurring.SOLUTION: An organic electroluminescent panel comprises: a substrate; a first electrode layer formed on the substrate; a luminous layer formed on the first electrode layer, in which a plurality of light-emitting parts is arranged in a planar manner; a prism disposed between the light-emitting parts; and a second electrode layer formed on the luminous layer. This organic electroluminescent panel is characterized in that an inclination angle made by a side face of the prism and a front face of the first electrode layer is smaller than 90°.

Description

  The present invention relates to an organic electroluminescence panel provided with a prism.

  An organic electroluminescence panel includes an organic EL element as a light emitting element, and is a self-luminous panel that can be used for various applications such as a display device, a lighting device, and a light source. Note that electroluminescence may be abbreviated as EL.

  Such an organic EL panel has high visibility due to self-coloring, and unlike a liquid crystal display panel, it is an all-solid-state display, so it has excellent impact resistance, has a fast response speed, and is less affected by temperature changes. In addition, it has attracted attention because of its advantages such as a wide viewing angle.

However, the organic EL panel has a wide viewing angle, but has low luminance in the front direction.
The brightness of the organic EL panel in the front direction is low because the organic EL element has no directivity for light emission, so when propagating through the organic EL panel, the interface of a substrate, an electrode, an organic layer, a medium having a different refractive index, such as air, etc. This is because reflection and refraction occur and light loss occurs. For example, light having an incident angle larger than the critical angle determined by the refractive index of the medium among the light emission of the organic EL element is totally reflected at the interface of the medium having different refractive indexes and is confined inside the layer, and is subjected to multiple reflection. After repetition, it is emitted from the end or decays and disappears.

  Therefore, various studies have been made as methods for improving the luminance in the front direction of the organic EL panel. For example, Patent Document 1 and Patent Document 2 propose providing a prism on the observation side of the organic EL element. If an optical element such as a prism is provided on the observation side of the organic EL element in this way, light from the organic EL element is condensed and extracted to the outside due to the refraction effect of the optical element, so that the light extraction efficiency can be improved. The brightness in the front direction can be increased.

Patent Document 3 proposes that a microcavity be provided on the observation side of an organic EL element in an organic EL element having a light emitting layer and a color conversion layer. By reflecting the excitation light from the light emitting layer by the microcavity and returning it to the color conversion layer, the light emission efficiency can be improved and the luminance in the front direction can be increased.
Furthermore, Patent Document 4 proposes that a prism or lenticular lens is provided on the observation side of the organic EL element in a display device that displays a stereoscopic image. Directivity can be enhanced by refracting light from the organic EL element with a prism or a lenticular lens.

However, conventionally, as described in Patent Documents 1 to 4, since the optical element is arranged outside the organic EL panel, the distance between the organic EL element and the optical element is long, and the effect of the optical element is sufficient. However, there is room for improvement in the luminance in the front direction.
Moreover, when an optical element is arrange | positioned on the outer side of an organic EL panel, an organic EL panel will become thick and the use of an organic EL panel will be limited.

By the way, in recent years, it is widely performed to attach a touch panel that can be operated by touching the screen on the screen of the organic EL panel.
When the organic EL panel is a top emission type organic EL panel that extracts light from the sealing material side, the touch panel is provided on the sealing material side of the organic EL panel, that is, the outermost surface on the observation side of the organic EL panel. Therefore, when it has an optical element in the observation side of an organic electroluminescent panel like patent documents 1-4, a touch panel is arrange | positioned on the optical element in an organic electroluminescent panel. At this time, if the uneven surface of the optical element is arranged so as to face the observation side of the organic EL panel, it is difficult to form the touch panel directly on the uneven surface of the optical element. It is necessary to provide another layer between them or attach the touch panel via an adhesive or the like.
However, if another layer is provided between the optical element and the touch panel, or if the touch panel is attached via an adhesive or the like, the organic EL panel becomes thick due to an increase in the number of layers to be stacked. There is a problem that the use of the panel is limited. In addition, when a touch panel is attached, there is a problem that the manufacturing process becomes complicated because the touch panel needs to be formed separately.

  Furthermore, in addition to the above-described problems, when the organic EL panel is applied to a display device or the like, the phase difference of the light from the front direction and the phase difference of the light from the oblique direction are different, so that it is viewed from the oblique direction. There is a problem that a color shift occurs on the screen.

JP 2007-25546 A JP 2009-158181 A JP 2007-207633 A JP 2010-117398 A

  The present invention has been made in view of the above circumstances, and it is possible to improve the luminance in the front direction while suppressing the viewing angle from being narrowed, to reduce the thickness, and to suppress the occurrence of color misregistration. An object of the present invention is to provide an organic electroluminescence panel that can be used.

  The present invention provides a substrate, a first electrode layer formed on the substrate, a light emitting layer formed on the first electrode layer, in which a plurality of light emitting units are arranged in a plane, and a space between the light emitting units. An organic electroluminescence panel having a prism disposed on the light emitting layer and a second electrode layer formed on the light emitting layer, wherein an inclination angle between a side surface of the prism and the surface of the first electrode layer is 90 °. The organic electroluminescence panel is characterized by being less than the above.

According to the present invention, since the prism is disposed between the light emitting units, a part of the light emitted from the light emitting unit is reflected by the side surface formed at a predetermined inclination angle, and the organic The luminance in the front direction of the EL panel can be improved. In addition, some of the light emitted from the light emitting unit includes light that enters the prism and exits from the surface facing the incident surface, and light that does not enter the prism. Since the viewing angle of the organic EL panel is generally maintained, it is possible to obtain an organic EL panel capable of improving the luminance in the front direction while suppressing the viewing angle from being narrowed.
Further, in the organic EL panel of the present invention, the prism is arranged between the light emitting portions, that is, the light emitting layer in which a plurality of light emitting portions are arranged in a plane and the prism are about one layer thick. Therefore, the organic EL panel can be thinned.
Further, since the prisms are arranged between the light emitting units, the prisms corresponding to the respective light emitting units can be individually arranged. Therefore, the prisms according to the emission colors of the respective light emitting units. It is possible to adjust the shape, size, position, etc. As a result, in the present invention, the amount of light reflected in the front direction of the organic EL panel of the present invention can be adjusted, and thereby the color tone of the organic EL panel can be adjusted. It is possible to suppress the occurrence of color misregistration that occurs when the is applied to a touch panel or the like.

  In this invention, it is preferable that the said inclination angle of the side surface in the said prism changes for every said corresponding light emission parts. By adjusting the inclination angle of the side surface of the prism in accordance with the corresponding light emitting section, the light is reflected by the side surface of the prism formed at a predetermined inclination angle, and is emitted in the front direction of the organic EL panel of the present invention. The amount of light can be adjusted with higher accuracy, and a high-quality organic EL panel can be obtained.

  In the present invention, there is provided an organic electroluminescence panel that can be thinned while improving the brightness in the front direction and suppressing the viewing angle from being narrowed, and further suppressing the occurrence of color misregistration. Can be provided.

It is a schematic sectional drawing which shows an example of the organic electroluminescent panel of this invention. It is a schematic diagram explaining the organic electroluminescent panel of this invention. It is a schematic sectional drawing which shows an example of the prism in this invention. It is the schematic which shows the other example of the organic electroluminescent panel of this invention. It is the schematic which shows the other example of the organic electroluminescent panel of this invention. It is the schematic which shows the other example of the organic electroluminescent panel of this invention. It is the schematic which shows the other example of the prism in this invention. It is a schematic perspective view which shows the other example of the organic electroluminescent panel of this invention. It is a schematic sectional drawing which shows the other example of the prism in this invention. It is a schematic sectional drawing which shows the other example of the organic electroluminescent panel of this invention. It is the schematic which shows the other example of the prism in this invention.

  Hereinafter, the organic EL panel of the present invention will be described in detail.

  The organic EL panel of the present invention includes a substrate, a first electrode layer formed on the substrate, a light emitting layer formed on the first electrode layer, in which a plurality of light emitting portions are arranged in a plane, An organic electroluminescence panel having a prism disposed between light emitting portions and a second electrode layer formed on the light emitting layer, wherein an inclination formed by a side surface of the prism and a surface of the first electrode layer The angle is less than 90 °.

The organic EL panel of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of the organic EL panel of the present invention. As illustrated in FIG. 1, an organic EL panel 1 of the present invention includes a first electrode layer 3 formed on a substrate 2 and a light emitting section 4a formed on the first electrode layer 3 and having different emission colors. A light emitting layer 4 in which 4b and 4c are arranged in a plane, a prism 5 disposed between the light emitting portions 4a, 4b and 4c in the light emitting layer 4, and a second electrode formed on the light emitting layer 4 A layer 6 and a sealing material 7 formed on the second electrode layer 6 are included. The side surface of the prism 5 is inclined with respect to the surface of the first electrode layer 3, and the inclination angle θ formed between the side surface of the prism 5 and the surface of the first electrode layer 3 is less than 90 °.

In such an organic EL panel, since the prism is arranged between the light emitting units, a part of the light emitted from the light emitting unit is formed at a predetermined inclination angle. Since the light reflected from the side surface and reflected is emitted from the sealing material side which is the front direction of the organic EL panel, the luminance in the front direction of the organic EL panel can be improved. In addition, some of the light emitted from the light emitting unit includes light that enters the prism and exits from the surface facing the incident surface, and light that does not enter the prism. Since the viewing angle of the organic EL panel is generally maintained, it is possible to obtain an organic EL panel capable of improving the luminance in the front direction while suppressing the viewing angle from being narrowed.
Further, in the present invention, instead of arranging the prism outside the sealing material as in the prior art, the prism is arranged between the light emitting portions, so the distance between the light emitting layer and the prism can be reduced, The brightness in the front direction can be further improved.

  In the organic EL panel of the present invention, the prism is disposed between the light emitting units, that is, a layer having a light emitting layer in which a plurality of light emitting units are arranged in a plane and the prism is approximately Since it can design with the thickness for one layer, an organic electroluminescent panel can be made thin. Therefore, it can be suitably used for applications requiring thinness.

  Further, since the prisms are arranged between the light emitting units, the prisms corresponding to the light emitting units can be individually arranged. It is possible to adjust the shape, size, position, etc. of the prism. As a result, in the present invention, the amount of light reflected in the front direction of the organic EL panel of the present invention can be adjusted, and thereby the color tone of the organic EL panel can be adjusted. It is possible to suppress the occurrence of color misregistration that occurs when is applied to a display device.

  Hereinafter, each configuration in the organic EL panel of the present invention will be described.

1. Prism The prism according to the present invention is disposed between the light emitting portions, and the inclination angle formed between the side surface of the prism and the surface of the first electrode layer is less than 90 °.

(1) Shape The shape of the prism in the present invention is not particularly limited as long as the inclination angle between the side surface of the prism and the surface of the first electrode layer is less than 90 °.
Here, since the incident angle and the reflection angle of the light with respect to the side surface of the prism are the same, if the inclination angle of the side surface of the prism is 90 °, the light traveling direction with respect to the substrate is reflected before and after the reflection on the side surface of the prism. The angle will be the same. Therefore, in the present invention, the inclination angle of the side surface of the prism is less than 90 °.
The inclination angle of the side surface of the prism refers to an angle θ formed by the surface of the first electrode layer 3 and the side surface of the prism 5 as illustrated in FIG.

As for the inclination angle, as shown in FIG. 2, a part of light radiated from the light emitting portion 4 a is reflected by the side surface of the prism 5, and the reflected reflected light h <b> 2 is emitted from the organic EL panel 1. Any angle may be used so long as the luminance in the front direction of the organic EL panel of the present invention is improved by emitting light from the sealing material 7 side which is a surface.
The tilt angle is appropriately adjusted according to the material of the prism and the refractive index between the prism and its surroundings. For example, when the organic EL panel of the present invention has a hollow structure, the surroundings refer to air or the like enclosed between the substrate and the sealing material. It refers to the filler filled between the stoppers.
Specifically, the reflectance increases as the incident angle of light with respect to the inclined side surface of the prism increases. That is, as the tilt angle is decreased, the incident angle of light incident on the tilted side surface of the prism is increased, so that the reflectance can be increased, whereby the luminance in the front direction of the organic EL panel of the present invention is increased. Can be improved.
Further, when the refractive index of the prism is smaller than the refractive index around the prism, total reflection may occur on the side surface of the prism. In this case, specifically, if the incident angle of light with respect to the inclined side surface of the prism is larger than the critical angle determined by the refractive index between the prism and its surroundings, the light is transmitted by the inclined side surface of the prism. Total reflection. That is, as the tilt angle is decreased, the incident angle of light incident on the tilted side surface of the prism is increased, so that part of the light emitted from the light emitting unit can be easily totally reflected. Thereby, the brightness | luminance of the front direction of the organic electroluminescent panel of this invention can be improved.
From this, the inclination angle of the side surface of the prism in the present invention is usually less than 90 °, but is preferably in the range of 60 ° to 85 °, for example, in the range of 65 ° to 80 °. It is preferable that it is in the range of 70 degrees-75 degrees especially.
When the inclination angle of the side surface of the prism in the present invention is within the above range, the luminance in the front direction of the organic EL panel can be efficiently improved.
As described above, the inclination angle of the side surface of the prism refers to the angle θ formed by the surface of the first electrode layer 3 and the side surface of the prism 5 as illustrated in FIG. The inclination angle can be measured by measuring a two-dimensional shape using a stylus type surface shape measuring device Dektak of ULVAC, Inc.

Further, the side surface of the prism in the present invention is usually a flat surface, but in the present invention, the side surface of the prism may be a curved surface. In this case, the inclination angle of one of the tangents on the curved surface may be less than 90 °. In addition, the inclination angle of the tangent of the curved surface refers to an angle formed between the surface of the first electrode layer 3 and the tangent of the curved surface.
The radius of curvature of the side surface of the prism in the present invention is appropriately adjusted according to the material of the prism and the refractive index between the prism and its surroundings, similar to the inclination angle of the side surface of the prism described above. It is preferably within a range of 10 μm to 1000 μm, more preferably within a range of 100 μm to 800 μm, and particularly preferably within a range of 200 μm to 600 μm.
The radius of curvature is a value representing the degree of curve bending as the radius of a circle corresponding to the degree of curve bending, and is the reciprocal of the curvature. The radius of curvature in the present invention corresponds to r1 in FIG.

As described above, the shape of the prism in the present invention is not particularly limited as long as the inclination angle formed between the side surface of the prism and the surface of the first electrode layer is less than 90 °. Examples of the longitudinal sectional shape of the prism include a triangle shown in FIGS. 1 and 3A, a trapezoid shown in FIG. 3B, and the like. Further, when the vertical cross-sectional shape of the prism is a triangle or a trapezoid, for example, the angle of the side surface of the prism may be changed stepwise as shown in FIG. 3C, or FIG. As shown in FIG.
The vertical cross-sectional shape of the prism is, for example, the inclination angles θ1 and θ2 of the side surface of the prism 5 in FIGS. 3A to 3C, or the left and right curvature radii of the side surface of the prism 5 in FIG. May be the same size or different sizes. That is, the vertical cross-sectional shape of the prism may be left-right symmetric or left-right asymmetric. When the vertical cross-sectional shape of the prism is bilaterally symmetric, the prism can be easily designed and manufactured. On the other hand, when the vertical cross-sectional shape of the prism is bilaterally asymmetric, Since the inclination angle, the radius of curvature, the shape, and the like can be adjusted according to the emission color of the light emitting unit, the amount of light reflected by the side surface of the prism can be freely adjusted. As a result, when the organic EL panel of the present invention is used in a display device, the occurrence of color misregistration such as a change in the color of the screen when viewed from an oblique direction is suppressed, and a high-quality organic EL panel is achieved. It becomes possible to do.

  The cross-sectional shape of the prism is not particularly limited as long as the prism can be disposed between the light emitting portions, and can be appropriately selected according to the arrangement of the prism and the like. For example, as shown in FIGS. 4, 5, 6 and 7, when the prism 5 is individually formed between the plurality of light emitting portions 4a, 4b and 4c, the cross-sectional shape of the prism is May be a polygon such as a triangle or a quadrangle, or a circle. Moreover, as shown in FIG. 8, when the prism 5 is continuously formed, the cross-sectional shape of the prism 5 may be a rectangle or an ellipse.

As described above, in the present invention, it is possible to freely design the shape of the prism, but it is preferable that the prism is individually formed corresponding to each light emitting portion.
4 to FIG. 8 that are not described in the organic EL panel of the present invention can be the same as those in FIG. 1, and thus the description thereof is omitted here.

  Furthermore, the vertical cross-sectional shape mentioned above refers to the cross-sectional shape shown by the broken line B in FIG. 9A showing a quadrangular pyramid prism and FIG. 9B showing a triangular prism. The cross-sectional shape indicated by the broken line C is indicated.

The height of the prism used in the present invention is not particularly limited as long as the inclination angle formed between the side surface of the prism and the surface of the first electrode layer can be less than 90 °. It is appropriately adjusted according to the shape and material of the prism.
In general, the higher the height of the prism, the greater the inclination angle of the side surface of the prism.
On the other hand, as the height of the prism is lowered, the inclination angle of the side surface of the prism is reduced. In this case, the amount of light reflected by the side surface of the prism and emitted in the front direction of the organic EL panel of the present invention increases, and the luminance in the front direction of the organic EL panel of the present invention can be improved. Moreover, since the thickness of the organic EL panel of this invention can be made thin when the height of the said prism is low, it can be set as an organic EL panel suitable for display apparatuses, such as a touch panel.
Specifically, it is preferably within a range of 5 μm to 100 μm, more preferably within a range of 10 μm to 80 μm, and particularly preferably within a range of 20 μm to 50 μm.
When the prism height in the present invention is larger than the above range, the thickness of the organic EL panel of the present invention may increase. On the other hand, if the prism height is smaller than the above range, the light is emitted from the light emitting unit. In some cases, it is difficult to reflect part of the light and emit the light in the front direction of the organic EL panel of the present invention.
Here, the height refers to the height H in FIGS.

The width of the prism used in the present invention is not particularly limited as long as the prism can be disposed between the light emitting portions, and depends on the inclination angle, height, material, etc. of the side surface of the prism. It is adjusted appropriately.
Note that the width here refers to the width W in FIGS.

In the present invention, the plurality of prisms formed between the light emitting units may have the same inclination angle, cross-sectional shape, height, and width as described above, or for each corresponding light emitting unit. May be different.
In the present invention, it is preferable that the plurality of prisms have different inclination angles, cross-sectional shapes, heights, widths, and the like for each corresponding light emitting section. By changing the angle of inclination, cross-sectional shape, height, width, etc. of the prism according to the color of light emitted by each light emitting unit, the luminance in the front direction of the organic EL panel of the present invention is improved, and The amount of light reflected from the side surface can be freely adjusted. As a result, when the organic EL panel of the present invention is used in a display device, the occurrence of color misregistration such as a change in the color of the screen when viewed from an oblique direction is suppressed, and an organic display capable of good display An EL panel can be obtained.

The “corresponding light emitting section” here will be described.
10A and 10B are schematic cross-sectional views showing an example of the organic EL panel of the present invention. For example, in the organic EL panel 1 of the present invention shown in FIGS. 10A and 10B, the prism 51 and the prism 52 correspond to the light emitting unit 4a, the prisms 52 and 53 correspond to the light emitting unit 4b, and the prism 53. The prism 54 corresponds to the light emitting unit 4c. That is, the “corresponding light emitting part” is a light emitting part arranged adjacent to one prism, and is emitted from the light emitting part on a side surface formed at a predetermined inclination angle of the one prism. It refers to a light emitting part that reflects part of light and can improve the brightness in the front direction of the organic EL panel of the present invention.
In addition, in the organic EL panel 1 of the present invention shown in FIGS. 10A and 10B, the inclination angles corresponding to the light emitting part 4a are 51R and 52R, and the inclination angles corresponding to the light emitting part 4b are 52G and 53G. In addition, the inclination angles corresponding to the light emitting part 4c are 53B and 54B.

Conventionally, when the organic EL panel of the present invention is used in a display device, the occurrence of color misregistration such as a change in color when viewed from an oblique direction has been a problem.
As a method for suppressing the occurrence of such color misregistration, the amount of light that is emitted obliquely with respect to the front direction of the organic EL panel out of the light emitted from the light emitting unit is determined for each emission color that each light emitting unit has. The method of adjusting to is mentioned.

When the organic EL panel shown in FIGS. 10A and 10B is used in a display device, a color shift occurs such that the color of the screen looks blue when viewed from an oblique direction. It is a schematic sectional drawing which shows an example of the organic electroluminescent panel of this invention suitable for.
10A and 10B, in the organic EL panel 1 of the present invention, the light emitting part 4a is the red light emitting part R, the light emitting part 4b is the green light emitting part G, and the light emitting part 4c is blue. The light emitting unit B.

The organic EL panel 1 of the present invention shown in FIG. 10A adjusts the width of each prism 51, 52, 53, and 54 in a state where the height of each prism 51, 52, 53, and 54 is constant. The prism tilt angles 53B and 54B corresponding to the blue light emitting portion B are larger than the prism tilt angles 51R and 52R corresponding to the red light emitting portion R and the prism tilt angles 52G and 53G corresponding to the green light emitting portion G. It is formed as follows.
As in the organic EL panel 1 shown in FIG. 10A, the angle θB indicating the spread of light emitted from the blue light-emitting portion B is adjusted by adjusting the width and inclination angle of each prism according to the corresponding light-emitting portion. Can be made smaller than the angle θR indicating the spread of light emitted from the red light emitting portion R and the angle θG indicating the spread of light emitted from the green light emitting portion G. That is, it is possible to reduce the amount of light emitted from the blue light-emitting portion B that does not strike the side surfaces of the corresponding prism 53 and prism 54 and is oblique to the front direction of the organic EL panel.

Further, the organic EL panel 1 of the present invention shown in FIG. 10B has a height of each prism 51, 52, 53, and 54 in a state where the width of each prism 51, 52, 53, and 54 is constant. The prism tilt angles 53B and 54B corresponding to the blue light-emitting portion B are changed from the prism tilt angles 51R and 52R corresponding to the red light-emitting portion R and the prism tilt angles 52G and 53G corresponding to the green light-emitting portion G, respectively. Is formed to be larger.
As in the organic EL panel 1 shown in FIG. 10B, the angle indicating the spread of light emitted from the blue light-emitting portion B by adjusting the height and inclination angle of each prism according to the corresponding light-emitting portion. θB can be made smaller than an angle θR indicating the spread of light emitted from the red light emitting portion R and an angle θG indicating the spread of light emitted from the green light emitting portion G. That is, it is possible to reduce the amount of light emitted from the blue light-emitting portion B that does not strike the side surfaces of the corresponding prism 53 and prism 54 and is oblique to the front direction of the organic EL panel.

Like the organic EL panel 1 of the present invention shown in FIGS. 10A and 10B, the prism 53 corresponding to the blue light emitting portion B, the size of the prism 54 such as the width and height, and the prism 53 , 54 by appropriately adjusting the inclination angles 53B and 54B of the side surfaces, when the organic EL panel of the present invention is used in a display device, the color shift when seen from an oblique direction appears blue. It becomes possible to make an organic EL panel capable of suppressing the occurrence of the above and enabling good display.
In the organic EL panel 1 shown in FIG. 10A, the height of each prism is made constant, and in the organic EL panel 1 shown in FIG. 10B, the width of each prism is made constant. The height, width, and inclination angle of the side surface may be different for each prism, and are not particularly limited.

As described above, in the present invention, when the organic EL panel of the present invention is used for a display device by appropriately adjusting the inclination angle, the cross-sectional shape, the height and the width of the prism in the organic EL panel, Occurrence of color misregistration such as a change in the color of the screen when viewed from an oblique direction can be suppressed.
10 that are not described in FIG. 10 can be the same as those in FIG.

(2) Position The prism in the present invention is disposed between the light emitting units.
That is, the position of the prism in the present invention is not particularly limited as long as it is between the light emitting portions, and is appropriately adjusted according to the inclination angle, cross-sectional shape, height, width, etc. of the prism. It is what is done.
Here, arranging the prisms between the light emitting units means arranging the prisms corresponding to the respective light emitting units. For example, the prisms individually formed between the light emitting units may be arranged. Alternatively, the prisms formed continuously between the light emitting units may be arranged.

FIG. 4A is a schematic perspective view showing an example of the organic EL panel of the present invention in which square pyramid prisms are individually arranged between a plurality of light emitting sections, and FIG. It is a schematic plan view of (a). FIG. 5A is a schematic perspective view showing another example of the organic EL panel of the present invention in which triangular prisms are individually arranged between a plurality of light emitting units, and FIG. It is a schematic plan view of (a).
As shown in FIGS. 4A and 4B and FIGS. 5A and 5B, the organic EL panel 1 of the present invention has the prisms 5 formed individually as shown in FIG. The arrangement | positioning arrange | positioned at the four sides of 4c may be sufficient.
As in the organic EL panel 1 of the present invention shown in FIG. 4, when the light emitting sections 4a, 4b, and 4c are arranged in a mosaic pattern and shifted by one pixel, the prism 5 It is preferable that the light emitting portions 4a, 4b and 4c are arranged in four directions. Moreover, it is preferable that the shape of the prism 5 formed individually is a quadrangular pyramid as shown in FIG.
Further, as in the organic EL panel 1 of the present invention shown in FIG. 5, when the light emitting units 4 a, 4 b, and 4 c are arranged in a mosaic shape, the prism 5 corresponds to the light emitting units 4 a, 4 b, and 4 c. It is preferable that the arrangement is arranged in the four directions. The prisms 5 formed individually are preferably triangular prisms as shown in FIG. 5A or trapezoidal prisms.
As in the organic EL panel 1 of the present invention shown in FIGS. 4 and 5, when the prisms 5 are arranged in the four directions of the light emitting parts 4a, 4b and 4c, the light is emitted from the light emitting parts 4a, 4b and 4c. A part of the emitted light hits the side surface of the prism 5 facing the four sides of each of the light emitting portions 4a, 4b and 4c. That is, as shown in FIG. 4 and FIG. 5, when the prism 5 is arranged in the four directions of the light emitting portions 4a, 4b, and 4c, the prism 5 is the prism 5 of the quadrangular pyramid shown in FIG. As in the triangular prism shown in FIG. 5, the light emitting portions 4a, 4b and 4c are formed with the inclined side surfaces facing the four sides, so that the light emitted from the light emitting portions 4a, 4b and 4c A part of the light can be efficiently reflected, and the luminance in the front direction of the organic EL panel 1 of the present invention can be further improved.

FIG. 6A shows an example of the organic EL panel of the present invention in which quadrangular pyramid prisms are arranged in rows between rows of a plurality of light emitting units arranged in rows. FIG. 6B is a schematic perspective view, and FIG. 6B is a schematic plan view of FIG.
As shown in FIGS. 6A and 6B, the organic EL panel 1 of the present invention has the light emitting portions 4a, 4b, and 4c in which the prisms 5 formed individually are arranged in rows. The arrangement | sequence arrange | positioned in the row | line | column between each row | line | column may be sufficient.
7A is a schematic perspective view showing the organic EL panel of the present invention in which the quadrangular pyramid prism in FIG. 6 is a triangular prism, and FIG. 7B is a schematic plan view of FIG. 7A. FIG.
As in the organic EL panel 1 of the present invention shown in FIGS. 6 and 7, when the prism 5 is arranged in a row between the rows of the light emitting portions 4a, 4b and 4c, The prisms 5 formed individually are preferably triangular prisms or trapezoidal prisms as shown in FIG.
As in the organic EL panel 1 of the present invention shown in FIGS. 6 and 7, when the prisms 5 are arranged in rows between the rows of the light emitting portions 4a, 4b, and 4c, Part of the light emitted from the light emitting units 4a, 4b, and 4c corresponds to the side surface of the prism 5 facing the light emitting units 4a, 4b, and 4c. That is, as shown in FIGS. 6 and 7, when the prism 5 is arranged on both sides of the light emitting portions 4 a, 4 b, and 4 c, as in the triangular prism 5 shown in FIG. 7. The light emitting portions 4a, 4b and 4c are formed with a predetermined inclination angle and the side surfaces facing the light emitting portions 4a, 4b and 4c are wide. It is possible to efficiently reflect part of the light emitted from the light source, and to further improve the luminance in the front direction of the organic EL panel 1 of the present invention.

Further, when the prisms are formed continuously, as shown in FIG. 8, the prisms 5 that are formed continuously are arranged in rows of the light emitting units 4a, 4b, and 4c. You may arrange | position between each row | line | column.
FIG. 11A is a schematic plan view showing an example of the organic EL panel of the present invention in which the prisms formed in succession are arranged so as to surround each light emitting portion, and FIG. It is the sectional view on the AA line of Fig.11 (a). In the present invention, as shown in FIGS. 11 (a) and 11 (b), the prism 5 formed continuously may be disposed so as to surround the light emitting portions 4a, 4b and 4c, respectively. Good.
The position of the prism in the present invention may be regular as described above, or may be irregular although not shown.

The interval between the prism and the light emitting part formed adjacent to the prism is such that a part of the light emitted from each light emitting part is reflected by the side surface of the prism formed at a predetermined inclination angle. The organic EL panel of the present invention is not particularly limited as long as the brightness in the front direction of the organic EL panel can be improved. For example, it is preferably 20 μm or less, and more preferably 10 μm or less. In particular, it is preferably 5 μm or less.
Since the distance between the prism and the light emitting unit adjacent to the prism is within the above range, a part of the light emitted from the light emitting unit is reflected by the side surface of the prism formed at a predetermined inclination angle. This is because the luminance in the front direction of the organic EL panel of the present invention can be improved.
In addition, the space | interval here points out S shown in FIG.

(3) Characteristics As a characteristic of the prism in the present invention, a part of the light radiated from the light emitting part is reflected by the side surface of the prism having a predetermined inclination angle, and the luminance in the front direction of the organic EL panel of the present invention. If it can improve, it will not specifically limit.
Hereinafter, specific characteristics of the prism according to the present invention will be described.

(I) Surface roughness The side surface of the prism in the present invention is preferably a flat surface. If the light emitted from the light emitting part is diffusely reflected on the side surface of the prism, there is a possibility that light loss may occur or it may be difficult to improve the brightness in the front direction. This is because the light emitted from the light emitting unit can be reflected uniformly. Therefore, it is preferable that the surface roughness of the side surface of the prism is small.
As the surface roughness of the side surface of the prism in the present invention, at least the side surface of the prism having a predetermined inclination angle reflects a part of the light emitted from the light emitting unit, and the surface roughness of the organic EL panel of the present invention is There is no particular limitation as long as the luminance can be improved.
As the surface roughness of the side surface of the prism having a predetermined inclination angle used in the present invention, for example, the maximum height Rmax of the side surface of the prism is preferably 500 nm or less, and more preferably 200 nm or less. Further, it is preferably 100 nm or less.
This is because when the maximum height Rmax of the side surface of the prism in the present invention is larger than the above range, light is diffusely reflected by the side surface of the prism, and light loss may occur. In addition, since the light is diffusely reflected, the light emitted in the front direction of the organic EL panel of the present invention has no directivity, and it becomes difficult to effectively improve the luminance in the front direction of the organic EL panel. Because.
In addition, the stylus type surface shape measuring device Dektak of ULVAC, Inc. can be used for the measurement of the surface roughness.

(Ii) Refractive index As the refractive index of the prism, a part of the light emitted from the light emitting part is reflected by the side surface of the prism having a predetermined inclination angle, and the luminance in the front direction of the organic EL panel of the present invention is determined. The refractive index of the prism may be different from the refractive index around the prism, and may be smaller or larger than the surrounding.
For example, when the organic EL panel of the present invention has a hollow structure, the surroundings refer to air or the like enclosed between the substrate and the sealing material, and in the case of solid sealing, the substrate and the sealing are used. It refers to the filler filled between the materials.
The refractive index difference between the prism and the periphery of the prism in the present invention is preferably in the range of 0.05 to 1.0, for example, and more preferably in the range of 0.1 to 0.7. Is preferable, and is particularly preferably within the range of 0.25 to 0.5.
Further, the refractive index of the prism may be within the above range as long as the refractive index difference between the prism and its surroundings. Specifically, it is preferably within the range of 1.4 to 2.0. It is preferably in the range of .5 to 1.8, particularly preferably in the range of 1.6 to 1.7.

(4) Material As a material of the prism in the present invention, a part of the light emitted from the light emitting part has an effect of changing the direction of the light by reflection, and the luminance in the front direction of the organic EL panel of the present invention. If it can improve, it will not specifically limit, The surface roughness mentioned above, the refractive index of the material, etc. are considered suitably.

The prism used in the present invention may be transparent or may not have transparency. Also, the prism is a dichroic prism that reflects light of a specific wavelength and transmits light of other wavelengths, or transmits light of a specific wavelength but does not transmit light of other wavelengths. May be.
In the present invention, when the prism has transparency, part of the light emitted from the light emitting part includes light reflected on the side surface of the adjacent prism, and enters the prism, and enters the incident surface. There is also light emitted from the opposite surface side.
On the other hand, in the case where the prism does not have transparency and has a light shielding property, the light that has entered the prism does not exit from the surface facing the entrance surface. In the case where a plurality of light emitting portions having different emission colors are provided, even if light of different colors is incident on one prism, the light is emitted from the surface facing the incident surface, and each light emitting portion is formed. , It is possible to prevent light of different emission colors from being mixed. Therefore, the contrast of the organic EL panel of the present invention can be improved. An example of the color tone of the prism when the prism does not have transparency and has light shielding properties is black.

  Such a prism material is appropriately selected according to the use of the organic EL panel of the present invention, and examples thereof include organic materials, inorganic materials, and organic-inorganic hybrid materials. As the organic material, for example, a general resin material can be used, and specifically, an ionizing radiation curable resin such as an ultraviolet curable resin or an electron beam curable resin, a thermosetting resin, a thermoplastic resin, or the like. Can be used.

(5) Manufacturing method The prism used for this invention is formed on the 1st electrode layer mentioned later.
The method for manufacturing the prism is not particularly limited as long as it can have a desired shape and size. For example, a photolithography method using a gradation mask or a microcontact printing method using an ultraviolet curable resin. Etc.

2. Light emitting layer The light emitting layer in the present invention is formed on the first electrode layer, and a plurality of light emitting portions are arranged in a plane.
Hereinafter, the light emitting unit will be described.

  Examples of the material used for the light emitting part include light emitting materials such as a dye material, a metal complex material, and a polymer material.

Examples of dye-based materials include cyclopentadiene derivatives, tetraphenylbutadiene derivatives, triphenylamine derivatives, arylamine derivatives, oxadiazole derivatives, pyrazoloquinoline derivatives, distyrylbenzene derivatives, distyrylpyrazine derivatives, distyrylarylene. Derivatives, silole derivatives, carbazole derivatives, anthracene derivatives, dinaphthylanthracene derivatives, phenylanthracene derivatives, thiophene ring compounds, pyridine ring compounds, perinone derivatives, perylene derivatives, oligothiophene derivatives, coumarin derivatives, oxadiazole dimers, pyrazoline dimers, Examples include phenanthrolines. Moreover, the compound which introduce | transduced the fluorene group and the spiro group into these can also be used.
Specifically, as the triphenylamine derivative, N, N′-bis- (3-methylphenyl) -N, N′-bis- (phenyl) -benzidine (TPD), 4,4,4-tris (3 -Methylphenylphenylamino) triphenylamine (MTDATA) and the like. Examples of the arylamine derivative include bis (N- (1-naphthyl-N-phenyl) benzidine) (α-NPD). Examples of the oxadiazole derivative include (2- (4-biphenylyl) -5- (4-tert-butylphenyl) -1,3,4-oxadiazole) (PBD). Examples of the dinaphthylanthracene derivative include 9,10-di-2-naphthylanthracene (DNA). Examples of the carbazole derivative include 4,4-N, N′-dicarbazole-biphenyl (CBP), 1,4-bis (2,2-diphenylvinyl) benzene (DPVBi), and the like. Examples of phenanthrolines include bathocuproin and bathophenanthroline. These materials may be used alone or in combination of two or more.

Examples of the metal complex-based material include Al, Zn, Be, Ir, Pt, etc. as a central metal, or rare earth metals such as Tb, Eu, Dy, etc., and oxadiazole, thiadiazole, phenylpyridine as a ligand. , Phenylbenzimidazole, metal complexes having a quinoline structure, and the like. Examples of the metal complex include an aluminum quinolinol complex, a benzoquinolinol beryllium complex, a benzoxazole zinc complex, a benzothiazole zinc complex, an azomethylzinc complex, a porphyrin zinc complex, a europium complex, an iridium metal complex, and a platinum metal complex.
Specifically, tris (8-quinolinol) aluminum complex (Alq3), bis (2-methyl-8-quinolinato) (p-phenylphenolate) aluminum complex (BAlq), tri (dibenzoylmethyl) phenanthroline europium complex, Bis (benzoquinolinolato) beryllium complex (Bebq) and the like can be mentioned. These materials may be used alone or in combination of two or more.

  Examples of the polymer material include polyparaphenylene vinylene derivatives, polythiophene derivatives, polyparaphenylene derivatives, polysilane derivatives, polyacetylene derivatives, polyvinylcarbazole, polyfluorenone derivatives, polyfluorene derivatives, polyquinoxaline derivatives, polydialkylfluorene derivatives, and Examples thereof include copolymers thereof. Moreover, what polymerized said pigment-type material and metal complex-type material as a polymeric material can also be used.

  Further, a dopant that emits fluorescence or phosphorescence may be added to the light emitting layer for the purpose of improving the light emission efficiency and changing the light emission wavelength. Examples of such dopants include perylene derivatives, coumarin derivatives, rubrene derivatives, quinacridone derivatives, squalium derivatives, porphyrin derivatives, styryl dyes, tetracene derivatives, pyrazoline derivatives, decacyclene, phenoxazone, quinoxaline derivatives, carbazole derivatives, fluorene derivatives, and the like. Can be mentioned. Specifically, 1-tert-butyl-perylene (TBP), coumarin 6, Nile red, 1,4-bis (2,2-diphenylvinyl) benzene (DPVBi), 1,1,4,4-tetraphenyl -1,3-butadiene (TPB).

Furthermore, as a phosphorescent dopant, an organometallic complex that has a heavy metal ion such as platinum or iridium at the center and exhibits phosphorescence can be used. Specifically, Ir (ppy) ₃ , (ppy) ₂ Ir (acac), Ir (BQ) ₃ , (BQ) ₂ Ir (acac), Ir (THP) ₃ , (THP) ₂ Ir (acac), Ir (BO) ₃ , (BO) ₂ (acac), Ir (BT) ₃ , (BT) ₂ Ir (acac), Ir (BTP) ₃ , (BTP) ₂ Ir (acac), FIr6, PtOEP, etc. are used. be able to.

  Here, the light emitting layer has a function of emitting light by providing a recombination field between electrons and holes. The light emitting layer may emit blue light, green light, yellow light, orange light, red light, or other single color light, or may emit white light due to a mixture of multiple colors. It may be. White light emission can be obtained by superimposing light emission from a plurality of light emitters. The light emitting layer that emits white light may be, for example, one that obtains white light emission by superimposing two-color light emission of two types of light emitters having a predetermined peak wavelength, and three types of light emitters having a predetermined peak wavelength. It is also possible to obtain white light emission by superimposing these three colors.

  The thickness of the light emitting portion is not particularly limited as long as it can provide a function of emitting light by providing a recombination field between electrons and holes, and is, for example, about 1 nm to 500 nm. Can do.

The arrangement of the light emitting parts is not particularly limited as long as the plurality of light emitting parts are arranged in a plane.
Here, “planar arrangement” means arrangement on the same substrate in the length direction of the organic EL panel of the present invention. In the present invention, “on the same substrate” on which the light emitting part is formed refers to, for example, on a first electrode layer described later.

As a method for forming the light emitting portion, a general method for forming a light emitting portion can be employed, and any of a coating method and a vapor deposition method can be used. Examples of the coating method include an inkjet method, a spin coating method, a casting method, a dipping method, a bar coating method, a blade coating method, a roll coating method, a spray coating method, a gravure coating method, a flexographic printing method, a gravure printing method, and screen printing. Law. As the vapor deposition method, a physical vapor deposition method (PVD method) can be used, and examples thereof include a vacuum vapor deposition method and a sputtering method.
When the light emitting part is formed by the coating method, an expensive vacuum facility is not required unlike the vapor deposition method, which is advantageous in terms of cost.

3. First electrode layer The first electrode layer in the present invention is formed on a substrate.
The first electrode layer may or may not have optical transparency. However, in the present invention, since light is extracted from the second electrode layer side, it usually does not have optical transparency. Is done.

  The first electrode layer may be either an anode or a cathode.

The anode preferably has a low resistance, and a metal material that is a conductive material is generally used, but an organic compound or an inorganic compound may be used.
For the anode, a conductive material having a large work function is preferably used so that holes can be easily injected. For example, metals such as Au, Ta, W, Pt, Ni, Pd, Cr, Cu, Mo, alkali metals, alkaline earth metals; oxides of these metals; Al alloys such as AlLi, AlCa, AlMg, MgAg, etc. Mg alloys, Ni alloys, Cr alloys, alkali metal alloys, alkaline earth metal alloys, etc .; inorganic such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide Oxides; conductive polymers such as metal-doped polythiophene, polyaniline, polyacetylene, polyalkylthiophene derivatives, polysilane derivatives; α-Si, α-SiC; and the like. These conductive materials may be used alone or in combination of two or more. When two or more types are used, layers made of each material may be stacked.

The cathode preferably has a low resistance, and a metal material that is a conductive material is generally used, but an organic compound or an inorganic compound may be used.
For the cathode, it is preferable to use a conductive material having a low work function so that electrons can be easily injected. Examples thereof include magnesium alloys such as MgAg, aluminum alloys such as AlLi, AlCa, and AlMg, and alloys of alkali metals and alkaline earth metals such as Li, Cs, Ba, Sr, and Ca.

As a film forming method for the material of the first electrode layer, a general electrode forming method can be applied, for example, a PVD method such as a vacuum evaporation method, a sputtering method, an EB evaporation method, an ion plating method, or the like. The CVD method etc. can be mentioned. It is also possible to use a metal foil as the first electrode layer.
When the first electrode layer is formed in a pattern, for example, a vapor deposition method using a metal mask, a photolithography method, or the like can be given.

4). Second electrode layer The second electrode layer is light transmissive, and light is extracted from the second electrode layer side in the organic EL panel of the present invention.

The second electrode layer may be either an anode or a cathode.
Note that the anode and the cathode are the same as those described in the section of the first electrode layer, and a description thereof is omitted here.

The method for forming the second electrode layer is not particularly limited as long as it can be formed in a predetermined pattern, and examples thereof include a vapor deposition method using a metal mask.
As a film forming method for the material of the second electrode layer, a general electrode forming method can be applied, for example, a PVD method such as a vacuum evaporation method, a sputtering method, an EB evaporation method, an ion plating method, or the like. The CVD method etc. can be mentioned.

5. Substrate The substrate in the present invention supports the first electrode layer, the light emitting layer, the prism, and the second electrode layer.

The substrate may or may not have optical transparency.
When the substrate is light transmissive, for example, it can be formed into a glass substrate such as soda lime glass, alkali glass, lead alkali glass, borosilicate glass, aluminosilicate glass, silica glass, or a film. A resin substrate or the like can be used.
The resin used for the resin substrate is preferably one having relatively high solvent resistance and heat resistance. Specifically, fluorine resin, polyethylene, polypropylene, polyvinyl chloride, polyvinyl fluoride, polystyrene, ABS resin, polyamide, polyacetal, polyester, polycarbonate, modified polyphenylene ether, polysulfone, polyarylate, polyetherimide, polyether mon Phon, Polyamideimide, Polyimide, Polyphenylene sulfide, Liquid crystalline polyester, Polyethylene terephthalate, Polybutylene terephthalate, Polyethylene naphthalate, Polymicroxylene dimethylene terephthalate, Polyoxymethylene, Polyethersulfone, Polyetheretherketone, Polyacrylate, Acrylonitrile -Styrene resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin, Poxy resin, polyurethane, silicone resin, amorphous polyolefin and the like can be mentioned. Moreover, these copolymers can also be used. Further, if necessary, a substrate having a gas barrier property that blocks gas such as moisture and oxygen may be used.

  The thickness of the substrate is appropriately selected depending on the material of the substrate and the use of the organic EL panel. Specifically, the thickness of the substrate is about 0.005 mm to 5 mm.

6). Others The organic EL panel of the present invention may have constituent members to be described later as needed in addition to the constituent members described above. For example, you may have a sealing material, a positive hole injection transport layer, an electron injection transport layer, etc.
Hereinafter, the sealing material, the hole injection transport layer, and the electron injection transport layer will be described.

(1) Sealing material In the present invention, a sealing material may be formed on the second electrode layer.
Since the sealing material is formed on the light emission surface side of the organic EL panel of the present invention, it is a transparent substrate.
Note that the detailed description of the transparent substrate that can be used as the sealing material can be the same as that described in the section “5. Substrate”, and thus description thereof is omitted here.

  In the present invention, the space between the second electrode layer and the sealing material may be a hollow-sealed organic EL panel filled with air or an inert gas or evacuated, or the above-mentioned The space between the second electrode layer and the sealing material may be a solid-sealed organic EL panel filled with a filler such as resin.

  In the case of a hollow-sealed organic EL panel, the inert gas filled in the space between the second electrode layer and the sealing material is particularly a typical one used for organic EL panels. It is not limited, For example, nitrogen gas, helium gas, argon gas is mentioned. The space between the second electrode layer and the sealing material may be a vacuum.

  In the case of a solid-sealed organic EL panel, the filler filled in the space between the second electrode layer and the sealing material may be the second electrode layer and the sealing material in the organic EL panel. It is not particularly limited as long as it is generally used as a material for filling the space between, for example, photo-curing resin or thermosetting resin such as photosensitive polyimide resin, epoxy resin and acrylic resin, And inorganic materials.

(2) Hole Injecting and Transporting Layer In the present invention, a hole injecting and transporting layer may be formed between the light emitting layer and the anode.
The hole injection transport layer may be a hole injection layer having a hole injection function, or a hole transport layer having a hole transport function, and the hole injection layer and the hole transport layer are laminated. And may have both a hole injection function and a hole transport function.

  The material used for the hole injecting and transporting layer is not particularly limited as long as it is a material that can stabilize injection and transportation of holes to the light emitting layer, and is exemplified in the light emitting material of the light emitting layer. In addition to compounds, phenylamine, starburst amine, phthalocyanine, vanadium oxide, molybdenum oxide, ruthenium oxide, aluminum oxide, titanium oxide and other oxides, amorphous carbon, polyaniline, polythiophene, polyphenylene vinylene and their derivatives The conductive polymer can be used. Specifically, bis (N- (1-naphthyl) -N-phenyl) benzidine (α-NPD), 4,4,4-tris (3-methylphenylphenylamino) triphenylamine (MTDATA), poly-3 , 4 ethylenedioxythiophene-polystyrene sulfonic acid (PEDOT-PSS), polyvinylcarbazole and the like.

  The thickness of the hole injecting and transporting layer is not particularly limited as long as the hole injecting function and the hole transporting function are sufficiently exhibited. Specifically, the thickness is in the range of 0.5 nm to 1000 nm, particularly 10 nm to It is preferable to be in the range of 500 nm.

  The formation method of the hole injection transport layer may be a wet process in which a coating liquid for forming a hole injection transport layer in which the above-described materials or the like are dissolved or dispersed in a solvent may be applied. It may be a process and is appropriately selected according to the type of material.

(3) Electron Injecting and Transporting Layer In the present invention, an electron injecting and transporting layer may be formed between the light emitting layer and the cathode.
The electron injection / transport layer may be an electron injection layer having an electron injection function, may be an electron transport layer having an electron transport function, or may be a laminate of an electron injection layer and an electron transport layer. It may have both an electron injection function and an electron transport function.

  The material used for the electron injection layer is not particularly limited as long as it can stabilize the injection of electrons into the light emitting layer. In addition to the compounds exemplified as the light emitting material for the light emitting layer, aluminum may be used. Alkali metals such as lithium alloys, strontium, calcium, lithium, cesium, lithium fluoride, magnesium fluoride, strontium fluoride, calcium fluoride, barium fluoride, cesium fluoride, magnesium oxide, strontium oxide, sodium polystyrene sulfonate and the like Alkaline earth metal metals, alloys, compounds, organic complexes, and the like can be used.

  Alternatively, a metal doped layer in which an alkali metal or an alkaline earth metal is doped on an electron transporting organic material may be formed, and this may be used as an electron injection layer. Examples of the electron-transporting organic material include bathocuproine, bathophenanthroline, and phenanthroline derivatives. Examples of the metal to be doped include Li, Cs, Ba, and Sr.

  The material used for the electron transport layer is not particularly limited as long as it can transport electrons injected from the cathode to the light emitting layer. For example, bathocuproin, bathophenanthroline, phenanthroline derivative, triazole derivative Oxadiazole derivatives, tris (8-quinolinolato) aluminum complex (Alq3) derivatives, and the like.

  The thickness of the electron injection / transport layer is not particularly limited as long as the electron injection function and the electron transport function are sufficiently exhibited.

  The method for forming the electron injecting and transporting layer may be a wet process in which a coating liquid for forming an electron injecting and transporting layer in which the above-described materials or the like are dissolved or dispersed in a solvent may be applied. There may be, and it chooses suitably according to the kind etc. of material.

7). Manufacturing method of organic EL panel In manufacturing an organic EL panel according to the present invention, after forming the first electrode layer on the substrate, the prism is formed by a photolithography method using a gradation mask, and then the light emitting layer and The second electrode layer is preferably formed sequentially.
In addition, since it is the same as that of what was described in each item from "1. prism" to "5. board | substrate" about the detailed manufacturing method of each member, description here is abbreviate | omitted.

8). Use The organic EL panel of the present invention can be used as a display device, a lighting device, and the like. Among them, the organic EL panel of the present invention can be suitably used for a display device from the viewpoint that color shift can be prevented. The display device may be passive matrix drive or active matrix drive.
Moreover, in this invention, since an organic electroluminescent panel can be made thin, it is suitable for portable telephones, such as a television, a smart phone, etc. for which thinness is requested | required.
Furthermore, in the present invention, since the prism is arranged between the light emitting units, that is, the prism is arranged in the organic EL panel, the outermost surface of the organic EL panel can be made flat, and the touch panel It can also be easily installed.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  The following examples illustrate the present invention in more detail.

[Example]
(Formation of first electrode layer)
First, an ITO thin film was formed on a glass substrate by a sputtering method so as to have a film thickness of 150 nm to form a first electrode layer as an anode.

(Formation of prism)
A photolithography method using a gradation mask using a triangular prism having an acrylic resin with a refractive index of 1.49, a height of 50 μm, and a side surface of the prism having an inclination angle of 75 ° on the first electrode layer. Formed by.

(Formation of hole injection transport layer)
N, N′-di (1-naphthyl) -N, N′-diphenyl- (1,1′-biphenyl) -4,4′-diaminine (α) is formed on the first electrode layer so as to be adjacent to the prism. -NPD) was deposited by resistance heating vapor deposition in a vacuum of 5 × 10 ⁻⁵ Pa so as to have a film thickness of 40 nm to form a hole injecting and transporting layer.

(Formation of light emitting layer)
As a light emitting layer having the function of an electron transport layer on the hole injection transport layer, a pressure of 5 × 10 ⁻⁵ Pa is applied so that tris (8-quinolinolato) aluminum (Alq3) has a film thickness of 60 nm. Inside, a light emitting layer was formed by vapor deposition by resistance heating vapor deposition.

(Formation of second electrode layer)
Next, MgAg was formed to a thickness of 20 nm on the light emitting layer to form a second electrode layer serving as a cathode.

[Comparative example]
An organic EL panel was produced in the same manner as in Example except that no prism was used.

[Evaluation]
First, the voltage of about 4.5V was applied to the organic EL panel of the comparative example which does not use a prism, and the brightness | luminance of the organic EL panel in the front direction was measured in the light-emitting state. Topcon luminance meter BM-9 was used for the measurement of the luminance in the front direction of the organic EL panel.
Next, about the organic EL panel of the Example using a prism, the brightness | luminance of the organic EL panel in the front direction was evaluated by simulation. In the simulation, the reflectance of the prism was set to 60%.
In addition, the reflectance in the simulation of an Example is a reflectance when the light which makes the incident angle to a prism 45 degrees is applied.

  As a result, the luminance in the front direction of the organic EL panel of the example is 1.78 when the luminance in the front direction of the organic EL panel of the comparative example that does not use the prism is 1. The example using the prism In the organic EL panel, the luminance in the front direction was improved as compared with the organic EL panel of the comparative example.

DESCRIPTION OF SYMBOLS 1 ... Organic electroluminescent panel 2 ... Board | substrate 3 ... 1st electrode layer 4a, 4b, 4c ... Light emission part 4 ... Light emission layer 5, 51, 52, 53, 54 ... Prism 6 ... 2nd electrode layer 7 ... Sealing material (theta) , Θ1, θ2 ... Inclination angle

Claims (2)

A substrate, a first electrode layer formed on the substrate, a light emitting layer formed on the first electrode layer and having a plurality of light emitting portions arranged in a plane, and the light emitting portion are disposed between the light emitting portions. An organic electroluminescence panel having a prism and a second electrode layer formed on the light emitting layer,
An organic electroluminescence panel, wherein an inclination angle between a side surface of the prism and a surface of the first electrode layer is less than 90 °.   The organic electroluminescence panel according to claim 1, wherein the inclination angle of the side surface of the prism is different for each of the corresponding light emitting units.