JP5957962B2 - Organic electroluminescence panel - Google Patents

Description

  The present invention relates to a top emission type organic electroluminescence panel.

  The organic electroluminescence element has high visibility due to self-coloring, is an all-solid-state display unlike a liquid crystal display device, has excellent impact resistance, has a fast response speed, is less affected by temperature changes, and Advantages such as a wide viewing angle are attracting attention. Hereinafter, organic electroluminescence may be abbreviated as organic EL.

  Generally, the light extraction efficiency of an organic EL panel is said to be about 20% to 30%. This is because the light loss is large because the light emission of the organic EL element is not directional.

  Therefore, various studies have been made for the purpose of improving the light extraction efficiency. For example, Patent Documents 1 to 3 propose providing optical elements such as prisms and microlenses on the observation side of the top emission type organic EL panel. Since the light from the light emitting layer is condensed and extracted to the outside by the light refraction effect by the optical element such as a prism or a microlens, the light extraction efficiency can be improved.

  Patent Document 4 proposes to provide a microcavity on the observation side of a top emission type organic EL element for the purpose of improving luminous efficiency in an organic EL element having a light emitting layer and a color conversion layer. . In Patent Document 4, light emission efficiency is improved by reflecting excitation light from the light emitting layer by the microcavity and returning it to the color conversion layer.

Patent Document 5 proposes that a display device for displaying a three-dimensional image is provided with a prism on the observation side of a top emission type organic EL element for the purpose of improving the light utilization efficiency. In Patent Document 5, the light utilization efficiency is enhanced by refracting light from the light-emitting layer by a prism and making it easier to guide to a predetermined opening.
Similarly, Patent Document 6 proposes that a prism or lenticular lens is provided on the observation side of a top emission type organic EL panel for the purpose of improving light utilization efficiency in a display device that displays a stereoscopic image. Yes. It has also been proposed to use a lenticular lens having a convex lens surface and a prism surface. In Patent Literature 6, light from the light emitting layer is refracted by a prism or a lenticular lens, thereby improving directivity and improving light utilization efficiency.

JP 2007-25546 A JP 2009-158181 A JP 2011-204384 A JP 2007-207633 A JP 2009-163088 A JP 2010-117398 A

  For example, in Patent Documents 1, 2, and 4, an optical element such as a prism is arranged such that an uneven surface such as a prism surface faces the observation side of the organic EL panel. However, in this case, the distance between the light emitting layer and the uneven surface is increased, and it is difficult to obtain the effect of the optical element.

  In recent years, it has been widely performed to attach a touch panel as an input unit on the screen of an organic EL panel. Since the touch panel is provided on the outermost surface on the observation side of the organic EL panel, it is disposed on the optical element. At this time, since it is difficult to form the touch panel directly on the optical element when the optical element is arranged so that the uneven surface such as a prism surface faces the observation side of the organic EL panel, an adhesive or the like is used. Will be pasted. However, in this case, it is necessary to separately form a touch panel, and the manufacturing process becomes complicated.

  On the other hand, Patent Document 3 proposes arranging optical elements such as lenses and prisms so that the concavo-convex surface faces the organic EL element side. However, when the optical element has a sharp shape such as a triangular prism or a quadrangular pyramid prism, the luminance distribution has a plurality of peaks, and there is a problem that high front luminance cannot be obtained. In addition, when the optical element is a lens, although the light is strongly collected in the front direction, there is a problem that if the light is collected too much, it becomes dark on the high angle side and the viewing angle becomes narrow. Further, in the case of a lens, there is a problem that it is difficult to obtain an effect for light traveling from the light emitting point to a high angle side.

  The present invention has been made in view of the above problems, and has as its main object to provide an organic EL panel capable of realizing high front luminance.

  In order to achieve the above object, the present invention provides a support substrate, a back electrode layer formed on the support substrate, an organic EL layer formed on the back electrode layer and including a light emitting layer, and the organic EL layer. An organic EL substrate having a transparent electrode layer formed thereon, a transparent substrate, and an optical member formed on the transparent substrate and having a plurality of light collecting portions, and the optical member faces the organic EL substrate. An organic EL panel having a counter substrate arranged in such a manner that the condensing part is formed for each pixel, and the cross-sectional shape of the condensing part is a trapezoidal shape. To do.

  In the present invention, the counter substrate is arranged so that the optical member faces the organic EL substrate side, the cross-sectional shape of the light collecting portion is trapezoidal, and the incident surface on which light from the light emitting layer enters the light collecting portion Since the condensing part is formed for each pixel, the light from the light emitting layer can be totally reflected or reflected by the side surface of the condensing part, improving the light extraction efficiency, and the front luminance. Can be increased.

  In the said invention, it is preferable that the said optical member has a base part and the said several condensing part formed on the said base part. Since the base portion is formed, the light from the light emitting layer passes in an oblique direction, so that the front luminance can be increased while maintaining the wide viewing angle of the organic EL panel.

  In the present invention, it is preferable that the size of the light condensing part is different depending on the emission color of the pixel. By adopting such a configuration, it is possible to make it difficult for light from the light emitting layer to pass in an oblique direction according to the emission color, and it is possible to adjust the color when viewed from the oblique direction, and a good display This is because it becomes possible.

  In the present invention, the light extraction efficiency can be improved and the front luminance can be increased by totally reflecting or reflecting the light from the light emitting layer on the side surface of the light collecting section.

It is a schematic sectional drawing which shows an example of the organic electroluminescent panel of this invention. It is a schematic sectional drawing 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 organic electroluminescent panel of this invention. It is a schematic sectional drawing 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 organic electroluminescent panel of this invention. It is a schematic sectional drawing 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 organic electroluminescent panel of this invention. It is a schematic plan view which shows an example of the opposing board | substrate in this invention. It is a schematic sectional drawing which shows an example of the opposing board | substrate in this invention, and is AA sectional view taken on the line of FIG. 8, and BB sectional drawing of Fig.10 (a). It is the schematic plan view which shows the other example of the opposing board | substrate in this invention, and the schematic plan view which shows an example of the organic electroluminescent board | substrate in this invention. It is a schematic sectional drawing 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 organic electroluminescent panel of this invention. It is a graph which shows the emitted light intensity of the organic electroluminescent panel of an Example and a comparative example.

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

  The organic EL panel of the present invention was formed on a supporting substrate, a back electrode layer formed on the supporting substrate, an organic EL layer formed on the back electrode layer, including a light emitting layer, and the organic EL layer. An organic EL substrate having a transparent electrode layer, a transparent substrate, and an optical member formed on the transparent substrate and having a plurality of light collecting portions, the optical member being disposed so as to face the organic EL substrate An organic EL panel having a counter substrate, wherein the condensing part is formed for each pixel, and a cross-sectional shape of the condensing part is a trapezoidal shape.

The organic EL panel of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic sectional view showing an example of the organic EL panel of the present invention. As illustrated in FIG. 1, the organic EL panel 1 includes an organic EL substrate 10 and a counter substrate 11. In the organic EL substrate 10, the back electrode layer 3 is formed on the support substrate 2, and the light emitting layer 4 including the red light emitting layer 4R, the green light emitting layer 4G, and the blue light emitting layer 4B is formed on the back electrode layer 3 to emit light. A transparent electrode layer 5 is formed on the layer 4. In the counter substrate 11, an optical member 14 having a plurality of light collecting portions 13 is formed on the transparent substrate 12. The organic EL substrate 10 and the counter substrate 11 are arranged so that the transparent electrode layer 5 of the organic EL substrate 10 and the optical member 14 of the counter substrate 11 face each other. Further, in the counter substrate 11, the light condensing part 13 is formed for each pixel P, and the cross-sectional shape of the light converging part 13 is a trapezoidal shape having a long side on the transparent substrate 12 side and a short side on the organic EL substrate 10 side. Yes. The organic EL panel 1 is a top emission type that extracts light L from the counter substrate 11 side.

  In the present specification, the “pixel” is a minimum unit constituting an image. For example, when one pixel is composed of three subpixels of red, green, and blue, in the present invention, one subpixel is referred to as a pixel.

Here, in the organic EL panel, the optical member is usually made of resin, glass, or the like, and a medium such as air or a curable resin is filled between the substrates. Therefore, in the organic EL panel 1 shown in FIG. 1, the light emitting layer 4 is formed by the refractive index ratio between the resin or glass constituting the optical member 13 and the medium filled between the organic EL substrate 10 and the counter substrate 11. The light L transmitted through the upper bottom surface of the light collecting unit 13 and incident on the side surface of the light collecting unit 13 at an incident angle larger than the critical angle is totally reflected. Therefore, a part of the light from the light emitting layer 4 is changed in its traveling direction by the light collecting unit 13 and is emitted from the transparent substrate 12 side.
At this time, the condensing unit 13 has a trapezoidal cross-sectional shape, and the incident surface on which the light L from the light emitting layer 4 enters the condensing unit 13 is a flat surface, and the condensing unit 13 is formed for each pixel P. Therefore, by appropriately adjusting the size of the upper bottom surface of the light collecting portion 13 and the size of the pixel P that become the incident surface, the angle of the light passing through the upper bottom surface of the light collecting portion 13 and the The angle of light incident on the side surface can be controlled. In addition, by appropriately adjusting the distance between the upper bottom surface of the light collecting unit 13 and the light emitting layer 4, the angle of light passing through the upper bottom surface of the light collecting unit 13 and the angle of light incident on the side surface of the light collecting unit 13 can be adjusted. It can also be controlled. Therefore, by controlling the size of the upper bottom surface of the light condensing unit 13 and the distance to the light emitting layer 4, the light from the light emitting layer 4 is transmitted through the upper bottom surface of the light condensing unit 13 on the side surface of the light condensing unit 13. It can make it easy to make it enter, and the light totally reflected by the side surface of the condensing part 13 can be increased. Therefore, in the present invention, it is possible to improve the light extraction efficiency and increase the front luminance.

  Further, in the case where an optical element such as a prism is arranged on the observation side of the organic EL panel as in the prior art, light extraction efficiency is improved by utilizing light refraction. The light is refracted when the incident angle is less than the critical angle, and is totally reflected when the incident angle is larger than the critical angle. Therefore, there is a difference in the degree of change in the light path direction between light refraction and total reflection. As described above, total reflection occurs when the incident angle is larger than the critical angle. Therefore, in the case of total reflection, the path direction of light changes greatly compared to the case of refraction, that is, the incident direction of light. The angle of the light emission direction with respect to is increased. Therefore, the present invention using the total reflection of light can effectively increase the front luminance as compared with the one using the refraction of light.

  Moreover, in this invention, the condensing part may have a reflection structure in the side surface.

  FIG. 2 is a schematic sectional view showing another example of the organic EL panel of the present invention. In the organic EL panel 1 illustrated in FIG. 2, the light collecting unit 13 includes a pedestal portion 13 a formed on the transparent substrate 12 and a different refractive index reflective layer 13 b formed on the side surface of the pedestal portion 13 a. Yes. The different refractive index reflective layer 13b reflects light. The other configuration of the organic EL panel is the same as that of the organic EL panel illustrated in FIG.

In the organic EL panel 1 shown in FIG. 2, for example, when the different refractive index reflective layer 13b is a multilayer mirror or a dichroic mirror, the light L from the light emitting layer 4 is reflected by the different refractive index reflective layer 13b and is transparent. The light is emitted from the substrate 12 side. In the case of a dichroic mirror, light having a specific wavelength can be totally reflected.
Even when the different refractive index reflecting layer 13b is a metal layer such as Al or Ag, the light L from the light emitting layer 4 is reflected by the different refractive index reflecting layer 13b and emitted from the transparent substrate 12 side.
Further, when the different refractive index reflective layer 13b is an inorganic layer such as SiN or SiON, the light emitting layer is formed at the interface between the different refractive index reflective layer 13b and a medium such as air or curable resin filled between the substrates. The light L from 4 is reflected and emitted from the transparent substrate 12 side. The light L from the light emitting layer 4 can also be totally reflected according to the refractive index of the different refractive index reflecting layer 13b and the refractive index of the medium filled between the substrates.
Therefore, similarly to the organic EL panel shown in FIG. 1, the light extraction efficiency can be improved and the front luminance can be increased.
When the condensing part has a different refractive index reflective layer on the side surface, the angle dependency of incident light can be reduced, and light incident on the side surface of the condensing part at a relatively small incident angle can also be reflected. It becomes possible.

  FIG. 3 is a schematic sectional view showing another example of the organic EL panel of the present invention. In the organic EL panel 1 illustrated in FIG. 3, the light collector 13 has a concavo-convex shape 13 d on the side surface. The uneven shape 13d scatters light. The other configuration of the organic EL panel is the same as that of the organic EL panel illustrated in FIG.

In the organic EL panel 1 shown in FIG. 3, the light L from the light emitting layer 4 is diffusely reflected and emitted from the transparent substrate 12 side by the uneven shape 13 d provided on the side surface of the light collector 13. Therefore, similarly to the organic EL panel shown in FIG. 1, the light extraction efficiency can be improved and the front luminance can be increased.
When the condensing part has a concavo-convex shape on the side surface, it becomes possible to make the light distribution of the light emitted from the transparent substrate side gentle due to the scattering effect, compared with the case using light refraction. .

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

A. Counter substrate The counter substrate according to the present invention includes a transparent substrate and an optical member formed on the transparent substrate and having a plurality of light collecting portions, and the optical member is disposed so as to face the organic EL substrate. It is what.
Hereinafter, each component in the counter substrate will be described.

1. Optical member The optical member in this invention is formed on a transparent substrate, and has a some condensing part.
The optical member only needs to have a plurality of light collecting portions, and may have only a plurality of light collecting portions, and has a base portion and a plurality of light collecting portions formed on the base portion. It may be.
Hereinafter, each structure in an optical member is demonstrated.

(1) Condensing part The optical member in this invention has a some condensing part, and the condensing part is formed for every pixel, The cross-sectional shape is trapezoid shape.

The cross-sectional shape of the condensing part is a trapezoidal shape having a long side on the transparent substrate side and a short side on the organic EL substrate side.
Here, the “cross-sectional shape of the light collecting portion” refers to a cross-sectional shape in the height direction of the light collecting portion.
The “trapezoidal shape” is not only the case where the upper base of the trapezoid is a straight line as illustrated in FIG. 1, that is, the upper surface of the light collecting part 13 is a plane, but the upper side of the trapezoid as illustrated in FIG. The case where the bottom is a gentle curve, that is, the case where the upper bottom surface of the light collecting portion 13 is slightly curved is also included. Here, the “curved surface” is a curved surface that allows light from the light emitting layer to pass through the upper and bottom surfaces of the light collecting unit, enter the side surface of the light collecting unit, and reflect the light from the side surface of the light collecting unit. Say.
Also in the organic EL panel 1 shown in FIG. 4, the light L from the light emitting layer 4 is totally reflected on the side surface of the light collecting unit 13 and is emitted from the transparent substrate 12 side, similarly to the organic EL panel 1 shown in FIG. 1. It is possible to increase the front brightness. Although not shown, when the upper and bottom surfaces of the light collecting part are slightly curved, the light collecting part also has a reflective structure such as a different refractive index reflective layer or a concavo-convex shape on the side surface. Since the light from the light emitting layer is reflected by the reflecting structure provided on the side surface and emitted from the transparent substrate side, the front luminance can be increased.
The “trapezoidal shape” includes not only the case where the side surface is flat as illustrated in FIG. 1, but also the case where the side surface has an uneven shape as illustrated in FIG.

In order to increase the front luminance in the present invention, it is necessary that at least a part of the light from the light emitting layer hits the side surface of the light collecting portion. For example, in FIG. 5A, the light L from the light emitting layer 4 is not reflected at all. On the other hand, for example, in FIG. 5B, at least part of the light L from the light emitting layer 4 is reflected. This condition is shown in the following formulas (1) to (3). For simplicity, the light emitting point is the center point of the light emitting layer.
tan θ1 = X / Y (1)
sin θ1 / sin θ2 = n1 / n0 (2) (Snell's formula)
θ2> φ (3)
However, n1: Refractive index of condensing part
n0: refractive index of the medium filled between the organic EL substrate and the counter substrate
φ: Angle of the side of the condensing part
θ1: Angle of rays in the medium
θ2: Angle of the light beam in the condensing part
X: Distance from the light emitting point in the horizontal direction to the point where the light beam enters the light collecting part
Y: The distance from the light emitting point in the vertical direction to the point where the light beam enters the light collecting part. In addition, the said angle is an angle with respect to the normal line of a board | substrate. When the upper and lower surfaces of the light collecting portion are slightly curved, θ1 and θ2 are angles with respect to the normal line of the curved surface.

Therefore, although the cross-sectional shape of a condensing part should just be trapezoid shape, it is preferable to satisfy | fill said Formula (1)-(3).
An example satisfying the above formulas (1) to (3) is shown in Table 1.

  The above formula (3) indicates that the angle θ2 of the light beam in the condensing part is larger than the angle φ of the side surface of the condensing part at the end of the incident surface where the light from the light emitting layer enters the condensing part. ing. In the above description, the light beam at the end of the incident surface is considered, but actually the light beam that passes through a predetermined region of the incident surface corresponds to the side surface of the light collecting unit. The predetermined area of the incident surface becomes larger as the difference between the angle θ2 of the light beam in the light collecting portion and the angle φ of the side surface of the light collecting portion increases. Therefore, it is preferable that the difference between the angle θ2 of the light beam in the light collecting portion and the angle φ of the side surface of the light collecting portion is large.

Moreover, it is preferable that the inclination angle of the side surface of the light collecting portion is within a range of 60 degrees to 85 degrees, more preferably within a range of 65 degrees to 80 degrees, and further preferably within a range of 72 degrees to 78 degrees. is there. When the inclination angle of the side surface of the light collecting unit is larger than the above range and near 90 degrees, when the light is totally reflected on the side surface of the light collecting unit, the angle of the light incident direction and the angle of the light emitting direction are substantially the same This is because the effect of improving the front luminance cannot be obtained. Moreover, it is because it will become difficult to satisfy | fill said Formula (3) when the inclination | tilt angle of the side surface of a condensing part is smaller than the said range.
In addition, the inclination angle of the side surface of the light collecting unit refers to an angle ω formed by the surface of the transparent substrate 12 and the side surface of the light collecting unit 13 as illustrated in FIG.

  The height of the light collecting portion is not particularly limited as long as it is a height that can satisfy the above-described formulas (1) to (3) and the inclination angle of the side surface of the light collecting portion, and is appropriately adjusted. The Specifically, the height of the light collecting unit is about 40 μm to 60 μm.

The width of the upper and lower surfaces of the light collecting portion is not particularly limited as long as the width can satisfy the above expressions (1) to (3) and the inclination angle of the side surface of the light collecting portion. It is preferable that the width is equal to or greater than the width of the pixel, and more preferably larger than the width of the pixel. This is because the light from the light emitting layer can be easily applied to the side surface of the light collecting portion. Specifically, the width of the upper bottom surface of the light collecting unit is about 10 μm to 35 μm.
In addition, the upper bottom surface of the light collecting unit is a surface on the organic EL substrate side, and refers to a surface on the short side of the trapezoidal shape.
The width of the upper and bottom surfaces of the light collecting portion refers to the width W1 as illustrated in FIG. 6A, and the width of the pixel refers to the width W2 as illustrated in FIG. Further, when the upper and lower surfaces of the light collecting portion are slightly curved, the surface parallel to the surface of the transparent substrate 12 including the top of the light collecting portion 13 and the light collecting portion 13 are exemplified as shown in FIG. The width of the upper bottom surface of the trapezoidal shape approximated to the side surface of the light collecting portion 13 is defined as the width W1 of the upper bottom surface of the light collecting unit 13. When the planar view shape of the upper bottom surface of the light collecting portion is circular, the width of the upper bottom surface of the light collecting portion indicates the diameter.

Further, as the width of the lower bottom surface of the light collecting portion, it is possible to form the light collecting portion for each pixel, and satisfy the expressions (1) to (3) and the inclination angle of the side surface of the light collecting portion. However, it is not particularly limited as long as the width can be adjusted, and is adjusted as appropriate. Specifically, the width of the lower bottom surface of the light collecting unit is about 40 μm to 70 μm.
The lower bottom surface of the light collecting portion is a surface on the transparent substrate side, and refers to a surface on the long side of the trapezoidal shape.
When the planar view shape of the lower bottom surface of the light collecting portion is circular, the width of the lower bottom surface of the light collecting portion indicates the diameter.

Dimensions such as the inclination angle, height, width of the upper bottom surface, width of the lower bottom surface, and the like of the side surface of the light collecting unit may be the same or different depending on the emission color of the pixel. Especially, it is preferable that the dimension of the said light collection part changes according to the luminescent color of a pixel.
Here, in the organic EL panel, since the phase difference of light from the front direction and the phase difference of light from the oblique direction are different, there is a problem that the color changes when viewed from the oblique direction.
Therefore, by appropriately adjusting the size of the condensing part according to the emission color of the pixel, for example, compared with the light from the red light emitting layer and the green light emitting layer, the light from the blue light emitting layer is less likely to escape in an oblique direction. be able to. Therefore, it is possible to adjust the color when viewed from an oblique direction and to perform good display.

Specifically, the light collecting portion formed for the red pixel corresponding to the red light emitting layer is the red light collecting portion, and the light collecting portion formed for the green pixel corresponding to the green light emitting layer is the green light collecting portion. When the condensing part formed with respect to the blue pixel corresponding to the light part and the blue light emitting layer is a blue condensing part, the inclination angle of the side surface of the blue condensing part is set to the red condensing part and the green condensing part. By making it larger than the inclination angle of the side surface of the condensing part, it is possible to make it difficult for light from the blue light emitting layer to escape obliquely as compared with light from the red light emitting layer and the green light emitting layer. When the inclination angle of the side surface of the blue light condensing part is larger than the inclination angle of the side surface of the red light condensing part and the green light condensing part, as shown in FIG. The light L from the red light emitting layer 4R and the green light emitting layer 4G is incident from the upper bottom surface of the red light collecting portion 13R and the green light collecting portion 13G when the light emitting layer 4G and the blue light emitting layer 4B are respectively centered. Compared with the range emitted from the lower bottom surface, the range in which the light L from the blue light emitting layer 4B enters from the upper bottom surface of the blue light condensing part 13B and exits from the lower bottom surface can be narrowed. Therefore, it is possible to make it difficult for light from the blue light emitting layer to escape in an oblique direction.
In Figure 7, for example, the inclination angle omega _B side of the blue light converging portion 13B is, the inclined angle omega _G side of the inclination angle omega _R and the green light converging section 13G of the side surface of the red light converging portion 13R It is getting bigger.

  In addition, the width of the upper bottom surface of the blue light condensing unit is made smaller than the width of the upper bottom surface of the red light condensing unit and the green light condensing unit, thereby comparing with the light from the red light emitting layer and the green light emitting layer. Thus, it is possible to make it difficult for light from the blue light emitting layer to escape in an oblique direction. Similarly, the width of the lower bottom surface of the blue light condensing part is made smaller than the width of the lower bottom surface of the red light condensing part and the green light condensing part, thereby comparing with the light from the red light emitting layer and the green light emitting layer. Thus, it is possible to make it difficult for light from the blue light emitting layer to escape in an oblique direction. In these cases, when the light emitting point is the center point of each of the red light emitting layer, the green light emitting layer, and the blue light emitting layer, the light from the red light emitting layer and the green light emitting layer is reflected on the red light collecting portion and the green light collecting portion. Compared with the range in which light is incident from the upper bottom surface and emitted from the lower bottom surface, the range in which light from the blue light emitting layer is incident from the upper bottom surface of the blue light condensing portion and is emitted from the lower bottom surface can be narrowed. Therefore, it is possible to make it difficult for light from the blue light emitting layer to escape in an oblique direction.

  Further, the planar view shape of the light collecting portion, that is, the cross-sectional shape in the direction perpendicular to the height direction is appropriately selected according to the shape of the pixel, and examples thereof include a rectangle and a circle. That is, the three-dimensional shape of the condensing part is a truncated pyramid shape, a truncated cone shape as illustrated in FIGS. 8 and 9, a trapezoidal prism shape as illustrated in FIGS.

The arrangement of the condensing part is not particularly limited as long as the condensing part is formed for each pixel.
Note that “the condensing part is formed for each pixel” not only means that one condensing part 13 is formed for one pixel P as illustrated in FIGS. 8 and 9. As shown in FIG. 10B, when the light emitting layers of the same color, for example, the red light emitting layer 4R, the green light emitting layer 4G, and the blue light emitting layer 4B are formed in a stripe shape, FIGS. This includes the case where one condensing part 13 is formed for one row of pixels P as illustrated in FIG.
8 and 10A are schematic plan views showing an example of the counter substrate, and FIG. 9 is a cross-sectional view taken along the line AA in FIG. 8 and a cross-sectional view taken along the line BB in FIG. is there. FIG. 10B is a schematic plan view showing the arrangement of the light emitting layer 4 and the pixel P in the organic EL substrate 10.

  In particular, it is preferable that one condensing part is formed for one pixel. This is because the front luminance can be effectively increased by reflecting the light from the light emitting layer by the light collecting portion.

  Moreover, the condensing part may be formed so that adjacent condensing parts may contact, and may be formed so that adjacent condensing parts may not contact. For example, in FIG. 1, adjacent condensing portions 13 are formed so as to be in contact with each other, and in FIG. 7, adjacent green condensing portions 13G and blue condensing portions 13B are formed apart from each other. The formation position of such a condensing part is suitably selected according to the dimension of the above-mentioned condensing part.

The condensing part may be a single layer or may have a reflecting structure on the side surface.
Hereinafter, the first embodiment in which the light collecting portion is a single layer and the second embodiment in which the light collecting portion has a reflecting structure on the side surface will be described separately.

(A) First Embodiment In the present embodiment, the light collector 13 is a single layer as illustrated in FIG.

  The material for forming the condensing part is not particularly limited as long as the condensing part satisfying the above dimensions can be formed, and any of organic materials, inorganic materials, and organic-inorganic hybrid materials can be used. . Examples of organic materials include polyvinyl alcohol, polyvinylidene chloride, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polystyrene, polypropylene, polyacrylonitrile, polyimide, polyamide, polyvinyl chloride, photosensitive acrylic resin, photosensitive polyimide, and positive resist. , Cardo resin, polysiloxane, benzocyclobutene and the like. Examples of the organic-inorganic hybrid material include those in which an inorganic material such as silica is contained in an organic material such as an acrylic resin, an epoxy resin, a polyurethane resin, a polyimide resin, a polyamideimide resin, or a polyvinyl alcohol resin.

  Further, the refractive index of the condensing part is particularly limited as long as it is larger than the refractive index of the medium filled between the organic EL substrate and the counter substrate and can totally reflect the light from the light emitting layer. Although not intended, it is preferable that the ratio of the refractive index of the medium filled between the organic EL substrate and the counter substrate / the refractive index of the condensing part is 0.8 or less. This is because, if the refractive index ratio is within the above range, the critical angle can be reduced and total reflection can easily occur. Specifically, the refractive index of the light collecting part is about 1.5 to 2.0.

  Moreover, the condensing part in this embodiment may contain the scattering agent. This is because when the scattering agent is contained, the light distribution of the light emitted from the transparent substrate side can be reduced.

Light scattering fine particles can be used as the scattering agent. Examples of the light scattering fine particles include inorganic fine particles such as silicon oxide, aluminum oxide and barium sulfate, acrylic resins, divinylbenzene resins, benzoguanamine resins, styrene resins, melamine resins, acrylic-styrene resins, Examples thereof include organic fine particles such as polycarbonate resin, polyethylene resin, and polyvinyl chloride resin, or mixed fine particles of two or more of these.
The average particle diameter of the light-scattering fine particles is about 0.1 μm to 5.0 μm.
The shape of the light-scattering fine particles is preferably spherical in order to increase the scattering effect.

Moreover, the condensing part in this embodiment may have a nanostructure on the upper bottom surface. This is because, when the light from the light emitting layer is incident on the upper bottom surface of the light collecting portion, the nanostructure can suppress the reflection of the light and can scatter the light.
Examples of nanostructures include nanometer-order concavo-convex structures such as moth-eye structures.
For example, an imprint method can be used as a method of forming the nanostructure on the upper and bottom surfaces of the light collecting portion.

  The method for forming the condensing part is not particularly limited as long as it is a method capable of forming the condensing part satisfying the above-described cross-sectional shape and dimensions, for example, imprint method, photolithography method, printing method, etc. Is mentioned. Further, when the optical member is formed integrally with the transparent substrate as will be described later, a method of processing the transparent substrate by blasting, etching, cutting, or the like can be used.

(B) 2nd embodiment The condensing part in this embodiment has a reflective structure in a side surface.
The reflection structure only needs to be able to reflect light from the light emitting layer. For example, the light collection portion has a reflection structure on the side surface. For example, the light collection portion is formed on the side surface of the pedestal portion and the pedestal portion. The 1st aspect which has a different refractive index reflective layer, and the 2nd aspect which a condensing part has uneven | corrugated shape on the side surface are mentioned.
Hereinafter, the description will be made separately for each aspect.

(I) 1st aspect The condensing part in this aspect has a base part and the different refractive index reflective layer formed in the side surface of a base part. The different refractive index reflective layer reflects light from the light emitting layer. For example, in FIG. 2, the condensing part 13 has the base part 13a and the different refractive index reflective layer 13b formed in the side surface of the base part 13a.

(Pedestal)
As a material for forming the pedestal portion, the same material as that of the light collecting portion of the first embodiment can be used.

  As the dimensions such as the inclination angle, height, width of the upper bottom surface, width of the lower bottom surface, etc. of the pedestal portion, when the different refractive index reflective layer is formed on the pedestal portion, the inclination of the side surface of the light collecting portion described above The dimensions may be the same as the dimensions such as the angle, the height, the width of the upper bottom surface, and the width of the lower bottom surface.

Moreover, the base part in this aspect may contain the scattering agent. This is because when a scattering agent is contained, the light distribution of the light emitted from the transparent substrate side can be reduced.
As a scattering agent, it is the same as that of the scattering agent used for the condensing part of the said 1st embodiment.

Moreover, the base part in this aspect may have a nanostructure on the upper bottom surface. This is because, when the light from the light emitting layer is incident on the upper bottom surface of the light collecting portion, the nanostructure can suppress the reflection of the light and can scatter the light.
As a nanostructure, it is the same as that of the nanostructure used for the condensing part of the said 1st embodiment.

  The method for forming the pedestal portion is the same as the method for forming the light collecting portion in the first embodiment.

(Non-refractive index reflective layer)
The different refractive index reflecting layer is not particularly limited as long as it can reflect light from the light emitting layer, and examples thereof include a multilayer mirror, a dichroic mirror, a metal layer, and an inorganic layer.

The multilayer mirror is formed by laminating a plurality of thin films having different refractive indexes. The multilayer mirror is not particularly limited as long as it can reflect light from the light emitting layer. For example, Cr, Al, Ag, Au, Ni, Cr ₂ O ₃ , Al ₂ O ₃ , Cu, In A multilayer film in which a metal film such as Pt or ITO or a metal oxide film is laminated can be used.

The dichroic mirror reflects light of a specific wavelength and transmits light of other wavelengths. The dichroic mirror is not particularly limited as long as it reflects the wavelength of light emitted from the light emitting layer. For example, dielectric multilayer films having different refractive indexes can be used. _{, SiO 2, TiO 2, HfO} 2, Ta 2 O 5, Al 2 O 3, Cr 2 O 3, MgF 2, ZrO 2, Ti 3 O 5, TiO, Nb 2 O 5, CeO 2, ZnS, SiOF, A multilayer film in which films such as SiOC are stacked can be used.

The metal layer is not particularly limited as long as it can reflect light from the light emitting layer.
Specifically, the reflectance of the metal layer is preferably 50% or more, more preferably 75% or more, and further preferably 90% or more. The upper limit of the reflectance of the metal layer is not particularly limited and is usually 100%. The reflectance can be measured as a reflection spectrum when the calibration aluminum substrate is set to 100% using a microspectroscope OSP-SP2000 (manufactured by OLYMPUS).
The material used for the metal layer is not particularly limited as long as it satisfies the above reflectance, and examples thereof include aluminum, silver, tin, chromium, nickel, and titanium. These may be used alone or in combination of two or more.

The inorganic layer is not particularly limited as long as the light from the light emitting layer can be reflected, but it is preferable that the light from the light emitting layer can be totally reflected.
The refractive index of the inorganic layer is preferably larger than the refractive index of the pedestal and larger than the refractive index of the medium filled between the organic EL substrate and the counter substrate. This is because the light from the light emitting layer can be totally reflected at the interface between the inorganic layer and the medium filled between the organic EL substrate and the counter substrate.
As for the ratio of the refractive index of the medium filled between the organic EL substrate and the counter substrate / the refractive index of the inorganic layer, the medium filled between the organic EL substrate and the counter substrate in the first embodiment is used. This is the same as the ratio of the refractive index of the light source / the refractive index of the light condensing part. Further, the refractive index of the inorganic layer is the same as the refractive index of the light condensing part of the first embodiment.
The material used for the inorganic layer preferably satisfies the refractive index, and examples thereof include SiN and SiON.

An organic material or an organic-inorganic hybrid material can also be used for the different refractive index reflective layer. The refractive index of the organic material and the organic-inorganic hybrid material is preferably larger than the refractive index of the pedestal and larger than the refractive index of the medium filled between the organic EL substrate and the counter substrate. This is because the light from the light emitting layer can be totally reflected at the interface between the different refractive index reflecting layer and the medium filled between the organic EL substrate and the counter substrate.
The organic material preferably satisfies the above refractive index, and examples thereof include thiourethane resins, cyclic olefin resins, polycarbonate resins, acrylate resins, and methacrylate resins. Further, the organic-inorganic hybrid material preferably satisfies the above refractive index, and examples thereof include organic metal monomers containing zirconium and hafnium, organic-inorganic composite materials in which ZrO ₂ and TiO are dispersed, and the like. .

The thickness of the different refractive index reflective layer is not particularly limited as long as the light from the light emitting layer can be totally reflected, and is appropriately selected according to the type of the different refractive index reflective layer.
For example, the thickness of the multilayer mirror or dichroic mirror is preferably in the range of 100 nm to 2000 nm. Moreover, it is preferable that the thickness of a metal layer exists in the range of 10 nm-100 nm. If the thickness is less than the above range, sufficient reflectance may not be obtained. If the thickness exceeds the above range, formation may be difficult or visibility of the organic EL panel may be impaired. .
Moreover, it is preferable that the thickness of an inorganic layer exists in the range of 100 nm-2000 nm. This is because if the thickness is less than the above range, total reflection may not occur sufficiently, and if the thickness exceeds the above range, formation may be difficult.

  The method for forming the different refractive index reflective layer is not particularly limited as long as it is a method capable of forming the different refractive index reflective layer on the side surface of the pedestal portion, and is appropriately selected according to the type of the different refractive index reflective layer. The For example, after forming a different refractive index reflective layer so as to cover the pedestal portion, a method of removing the different refractive index reflective layer formed on the upper bottom surface of the pedestal portion, vapor deposition of the different refractive index reflective layer through a mask The method, the method of apply | coating the coating liquid for different refractive index reflective layer formation in a pattern form, etc. are mentioned. Examples of a method for forming the different refractive index reflective layer so as to cover the pedestal include a vacuum deposition method, a sputtering method, and a coating method. Examples of the method for removing the different refractive index reflective layer formed on the upper bottom surface of the pedestal include a polishing method.

(Ii) 2nd aspect The condensing part in this aspect has an uneven | corrugated shape in a side surface. For example, in FIG. 4, the condensing part 13 has the uneven | corrugated shape 13d on the side surface. This uneven shape scatters light.

The uneven shape is not particularly limited as long as light from the light emitting layer can be diffusely reflected, but specifically, the surface roughness Rmax is preferably in the range of 0.5 μm to 2.5 μm. This is because if the surface roughness Rmax is smaller than the above range, sufficient diffuse reflection may not occur, and if the surface roughness Rmax is larger than the above range, it is difficult to form an uneven shape.
The surface roughness Rmax is the maximum height, and can be obtained by measuring the surface roughness Rmax when the above uneven shape is formed on the surface of the measurement base material made of the same material as the light collecting portion. . The surface roughness Rmax can be measured by a stylus type surface shape measuring device Dektak manufactured by ULVAC.

  As a material for forming the light collecting part, the same material as the light collecting part in the first embodiment can be used.

  Moreover, the condensing part in this aspect may contain the scattering agent. This is because the light extraction efficiency can be improved by the light condensing part having the light scattering property. In addition, about the scattering agent, it is the same as that of the scattering agent used for the condensing part of the said 1st embodiment.

  The method for forming the concavo-convex shape on the side surface of the light collecting portion is not particularly limited as long as it is a method capable of forming the concavo-convex shape satisfying the surface roughness Rmax. A method of containing fine particles can be used. In the case of the method of containing fine particles in the light collecting part, the above-mentioned scattering agent can be used as the fine particles.

Moreover, the condensing part in this aspect may have a nanostructure on the upper bottom face. This is because, when the light from the light emitting layer is incident on the upper bottom surface of the light collecting portion, the nanostructure can suppress the reflection of the light and can scatter the light.
As a nanostructure, it is the same as that of the nanostructure used for the condensing part of the said 1st embodiment.

(2) Base part The optical member in this invention may have a base part and the some condensing part formed on the base part. For example, in FIG. 11, the optical member 14 has a base portion 15 and a plurality of light collecting portions 13 formed on the base portion 15.

  In the present invention, it is particularly preferable that the optical member has a plurality of light collecting portions formed on the base portion. As illustrated in FIG. 11, when a plurality of light collecting portions 13 are formed on the base portion 15, the light L from the light emitting layer 4 can be emitted through the base portion 15 in an oblique direction. . This makes it possible to increase the front luminance while maintaining the wide viewing angle of the organic EL panel.

As illustrated in FIG. 11, the light collecting unit 13 and the base unit 15 are usually formed integrally. Therefore, the refractive indexes of the condensing part and the base part are equal, and light from the light emitting layer can be emitted in an oblique direction without being refracted in the optical member.
Note that “the condensing part and the base part are integrally formed” means that the condensing part and the base part are formed as a single member, and the condensing part is composed of a pedestal part and a pedestal part. When it has the different refractive index reflective layer formed on the side surface, it means that the pedestal portion and the base portion are formed as a single member.

  The thickness of the base portion is not particularly limited as long as a light collecting portion satisfying the above-described dimensions can be formed on the base portion, and is appropriately adjusted. Specifically, it is about 1 μm to 10 μm. This is because if the thickness of the base is thinner than the above range, it may be difficult to maintain the wide viewing angle.

Further, as illustrated in FIG. 12, the optical member 14 may be formed integrally with the transparent substrate 12. In this case, the refractive indexes of the optical member and the transparent substrate are equal, and light from the light emitting layer can be emitted in an oblique direction without being refracted in the optical member and the transparent substrate. Therefore, when the optical member and the transparent substrate are integrally formed, the transparent substrate can be the base portion of the optical member.
Note that “the optical member and the transparent substrate are integrally formed” means that the optical member and the transparent substrate are formed as a single member, and the light collecting portion is formed on the side surface of the base portion and the base portion. When it has the formed different refractive index reflective layer, it means that the pedestal and the transparent substrate are formed as a single member.

  Furthermore, even when the refractive indexes of the optical member and the transparent substrate are substantially equal, light from the light emitting layer can be emitted in an oblique direction with almost no refraction in the optical member and the transparent substrate. Therefore, even when the refractive indexes of the optical member and the transparent substrate are substantially equal, the transparent substrate can be the base portion of the optical member. In this case, the difference between the refractive index of the transparent substrate and the refractive index of the optical member is preferably within a range of 0.01 to 0.1. At this time, the refractive index of the optical member may be larger or smaller than the refractive index of the transparent substrate. Note that the difference between the refractive index of the transparent substrate and the refractive index of the optical member is that the condensing part has a refracting index reflecting layer formed on the side surface of the pedestal part and the pedestal part. This is the difference between the refractive index and the refractive index of the pedestal.

2. Transparent substrate The transparent substrate used for this invention supports the said optical member.
In the present invention, as described above, the transparent substrate may be formed integrally with the optical member.

The transparent substrate is light transmissive. The light transmittance of the transparent substrate only needs to be transparent to the wavelength in the visible light region. Specifically, the light transmittance for the entire wavelength range in the visible light region is 80% or more. Of these, 85% or more, particularly 90% or more is preferable.
The light transmittance can be measured by, for example, an ultraviolet-visible light spectrophotometer UV-3600 manufactured by Shimadzu Corporation.

  Examples of the material for forming the transparent substrate include glass and resin.

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

3. In the present invention, the counter substrate is disposed so that the optical member faces the organic EL substrate. The distance between the counter substrate and the organic EL substrate is not particularly limited as long as the light from the light emitting layer can be totally reflected or reflected on the side surface of the light collecting portion, but is not more than 20 μm. In particular, it is preferably 10 μm or less, particularly preferably 5 μm or less. This is because the closer the counter substrate and the organic EL substrate are, the more efficiently light from the light emitting layer can be incident on the condensing part. The upper and bottom surfaces of the light condensing part in the counter substrate may be in close contact with the outermost surface of the organic EL substrate.
Note that the distance between the counter substrate and the organic EL substrate refers to a distance d from the upper bottom surface of the light collecting portion 13 of the counter substrate 11 to the outermost surface of the organic EL substrate 10 as illustrated in FIG. In addition, when the upper and lower surfaces of the light collecting portion are slightly curved, the distance from the top of the light collecting portion 13 of the counter substrate 11 to the outermost surface of the organic EL substrate 10 as illustrated in FIG. d.

B. Organic EL Substrate The organic EL substrate in the present invention is formed on a support substrate, a back electrode layer formed on the support substrate, an organic EL layer formed on the back electrode layer, including a light emitting layer, and the organic EL layer. A transparent electrode layer.
Hereinafter, each component in the organic EL substrate will be described.

1. Organic EL Layer The organic EL layer in the present invention is formed on the back electrode layer and includes at least a light emitting layer.
Examples of the layer constituting the organic EL layer include a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer in addition to the light emitting layer.
Hereinafter, each structure in the organic EL layer will be described.

(1) Light-Emitting Layer The light-emitting layer used in the present invention may be a monochromatic light-emitting layer or a multi-colored light-emitting layer, and is appropriately selected according to the use of the organic EL panel of the present invention. . Usually, a light emitting layer of a plurality of colors is formed.

  The light emitting material used for the light emitting layer may be any material that emits fluorescence or phosphorescence, and examples thereof include dye materials, metal complex materials, and polymer materials.

  Examples of dye-based materials include cyclopentadiene derivatives, tetraphenylbutadiene derivatives, triphenylamine derivatives, oxadiazole derivatives, pyrazoloquinoline derivatives, distyrylbenzene derivatives, distyrylarylene derivatives, silole derivatives, thiophene ring compounds, pyridine Examples thereof include a ring compound, a perinone derivative, a perylene derivative, an oligothiophene derivative, a coumarin derivative, an oxadiazole dimer, and a pyrazoline dimer.

  Examples of the metal complex material include an aluminum quinolinol complex, a benzoquinolinol beryllium complex, a benzoxazole zinc complex, a benzothiazole zinc complex, an azomethyl zinc complex, a porphyrin zinc complex, a europium complex, or a central metal such as Al, Zn, Be, etc. Alternatively, a metal complex having a rare earth metal such as Tb, Eu, or Dy and having a oxadiazole, thiadiazole, phenylpyridine, phenylbenzimidazole, quinoline structure, or the like as a ligand can be given. Specifically, tris (8-quinolinolato) aluminum complex (Alq3) can be used.

  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.

  As the phosphorescent material, for example, an iridium complex, a platinum complex, or a metal complex having a heavy metal having a large spin-orbit interaction such as Ru, Rh, Pd, Os, Ir, Pt, or Au as a central metal is used. Can do. Specific examples include iridium complexes having platinum pyridine, thienyl pyridine and the like as ligands, platinum porphyrin derivatives, and the like.

  These luminescent materials may be used alone or in combination of two or more.

  Further, a dopant that emits fluorescence or phosphorescence may be added to the light emitting material 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, and fluorene derivatives. Can be mentioned.

  The thickness of the light emitting layer is not particularly limited as long as it provides a function of emitting light by providing a recombination field of electrons and holes, and is, for example, about 10 nm to 500 nm.

  The method for forming the light emitting layer may be a wet process in which a light emitting layer forming coating solution in which the above light emitting material or the like is dissolved or dispersed in a solvent may be applied, or may be a dry process such as a vacuum deposition method. Good. Among these, a wet process is preferable from the viewpoint of efficiency and cost.

  Examples of the application method of the light emitting layer forming coating liquid 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 printing method, and screen printing. Method, flexographic printing method, offset printing method and the like.

(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 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, or by a dry process such as a vacuum evaporation method. There may be, and it chooses suitably according to the kind etc. of material.

2. Transparent electrode layer The transparent electrode layer in the present invention is formed on the organic EL layer.

  The transparent 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 oxides such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide, indium oxide; Examples thereof include conductive polymers such as metal-doped polythiophene, polyaniline, polyacetylene, polyalkylthiophene derivatives, and 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 method for forming the transparent electrode layer, a general electrode forming method can be used, for example, a PVD method such as a vacuum deposition method, a sputtering method, an EB deposition method, an ion plating method, or a CVD method. be able to.

3. Back Electrode Layer The back electrode layer in the present invention is formed on a support substrate.

  The back electrode layer may or may not have light transparency. However, in the present invention, light is extracted from the transparent electrode layer side, and therefore normally, it does not have light transparency. .

The back electrode layer may be either an anode or a cathode.
The materials for the anode and the cathode are described in the section of the transparent electrode layer, and the method for forming the back electrode layer is the same as the method for forming the transparent electrode layer, and thus the description thereof is omitted here.

4). Support Substrate The support substrate used in the present invention supports the back electrode layer, the organic EL layer, and the transparent electrode layer.

The support substrate may or may not have optical transparency.
Examples of the material for forming the support substrate include glass and resin.
The thickness of the support substrate is appropriately selected depending on the material of the support substrate and the use of the organic EL panel. Specifically, the thickness of the support substrate is about 0.005 mm to 5 mm.

5. Insulating layer In the counter substrate used in the present invention, an insulating layer may be formed in a pattern on the back electrode layer. The insulating layer is formed so as to define a pixel.
The pattern of the insulating layer is appropriately selected according to the arrangement of the pixels, and can be, for example, a lattice shape.
As a material of the insulating layer, a material of a general insulating layer in an organic EL panel can be used. For example, a photocurable resin such as a photosensitive polyimide resin or an acrylic resin, a thermosetting resin, an inorganic material, or the like. Can be mentioned.
The thickness of the insulating layer is not particularly limited as long as pixels can be defined and the transparent electrode layer and the back electrode layer can be insulated.
As a method for forming the insulating layer, a general method for forming an insulating layer in an organic EL panel can be applied, and examples thereof include a photolithography method.

6). Partition Wall In the counter substrate used in the present invention, the partition wall may be formed in a pattern on the insulating layer. The partition walls are formed so as to define a pattern of the transparent electrode layer. In the case where the partition walls are formed, the transparent electrode layer can be formed in a pattern without using a metal mask or the like.
The partition pattern is appropriately selected according to the pattern of the transparent electrode layer.
As a material for the partition, a general partition material in an organic EL panel can be used. For example, a photo-curable resin such as a photosensitive polyimide resin or an acrylic resin, a thermosetting resin, an inorganic material, or the like. Can be mentioned.
Further, when the light emitting layer is formed in a pattern, the partition may be subjected to a surface treatment that changes the surface energy in advance.
The height of the partition wall is not particularly limited as long as the pattern of the transparent electrode layer can be defined and the adjacent transparent electrode layers can be insulated from each other.
As a method for forming the partition, a general method for forming a partition in an organic EL panel can be applied, and examples thereof include a photolithography method.

C. Medium Filled Between Organic EL Substrate and Counter Substrate In the present invention, as a medium filled between the organic EL substrate and the counter substrate, those generally used for organic EL panels can be applied. Examples thereof include air, inert gas, and curable resin.

For example, nitrogen gas, helium gas, or argon gas can be used as the inert gas.
As the curable resin, either a thermosetting resin or a photocurable resin can be used. Specifically, a photocurable and thermosetting adhesive having a reactive vinyl group of an acrylate oligomer or a methacrylate oligomer. And epoxy and other heat and chemical curable (two-component mixed) adhesives.

The refractive index of the medium is not particularly limited, and is appropriately selected according to the configuration of the light collecting unit.
When the light collecting part is a single layer, the refractive index of the medium is smaller than the refractive index of the light collecting part, and the light from the light emitting layer can be totally reflected at the interface between the light collecting part and the medium. There is no particular limitation as long as it is present. Since the ratio of the refractive index of the medium / the refractive index of the light condensing part has been described above, the description thereof is omitted here.
When the condensing part has a pedestal part and a different refractive index reflective layer, and the different refractive index reflective layer is an inorganic layer, the refractive index of the medium is higher than the refractive index of the different refractive index reflective layer. It is preferable that the light from the light emitting layer is totally reflected at the interface between the different refractive index reflecting layer and the medium. Since the ratio of the refractive index of the medium / the refractive index of the different refractive index reflecting layer has been described above, the description thereof is omitted here.

  Specifically, when the medium is a curable resin, the refractive index of the curable resin is about 1.50 to 1.65.

Further, when the medium is a curable resin, the curable resin is light transmissive. The light transmittance of the curable resin is not particularly limited as long as it has transparency to the wavelength in the visible light region. Specifically, the light transmittance for the entire wavelength range in the visible light region is 80% or more. Of these, 85% or more, particularly 90% or more is preferable.
The light transmittance can be measured by, for example, an ultraviolet-visible light spectrophotometer UV-3600 manufactured by Shimadzu Corporation.

  As a medium sealing method, a general method can be adopted, and it is appropriately selected according to the type of the medium.

D. Organic EL Panel The organic EL panel of the present invention can be used as a display device, a lighting device or the like. Among these, a display device is preferable.

  The organic EL panel driving method of the present invention may be either active matrix driving or passive matrix driving.

  In the organic EL panel of the present invention, a color filter layer may be formed on either the organic EL substrate or the counter substrate.

  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.

  Hereinafter, the present invention will be specifically described with reference to examples.

[Example 1]
(Preparation of counter substrate)
A Cr metal film was formed on a glass substrate having a thickness of 0.7 μm and a refractive index of 1.51, and the Cr metal film was patterned so that the upper base width was 30 μm. Thereafter, the glass substrate is etched with hydrofluoric acid using the patterned Cr metal film as a mask, and the cross-sectional shape is a trapezoidal shape with an upper base width of 30 μm, a lower base width of 50 μm, and a height of 50 μm, and the three-dimensional shape is a trapezoidal prism shape. The condensing part which is is formed. The inclination angle of the side surface of this condensing part was 78.7 degrees.

(Production of organic EL panel)
Next, an organic EL substrate on which an organic EL element having a light emitting layer for each of RGB and a pixel having a width of 20 μm was formed was prepared. The organic EL substrate was disposed so that each of the RGB light emitting layers was aligned in the bonding direction with respect to the counter substrate, and the pixel on the organic EL substrate and the upper bottom surface of the condensing portion of the counter substrate were disposed to face each other. Next, the organic EL substrate and the counter substrate were bonded so that the distance between the outermost surface of the organic EL substrate and the upper bottom surface of the light collecting portion in the counter substrate was 10 μm. In this way, a top emission type organic EL panel was produced.

[Example 2]
A top emission type organic EL panel was produced in the same manner as in Example 1 except that the counter substrate was produced as follows.

(Preparation of counter substrate)
A Cr metal film was formed on a glass substrate having a thickness of 0.7 μm and a refractive index of 1.51, and the Cr metal film was patterned so that the upper base width was 30 μm. Thereafter, the glass substrate is ground by blasting using the patterned Cr metal film as a mask, and the cross-sectional shape is a trapezoidal shape with an upper base width of 30 μm, a lower base width of 50 μm, and a height of 50 μm, and the three-dimensional shape is a trapezoidal prism shape. The condensing part which is is formed. The inclination angle of the side surface of this condensing part was 78.7 degrees.

[Example 3]
A top emission type organic EL panel was produced in the same manner as in Example 1 except that the counter substrate was produced as follows.

(Preparation of counter substrate)
A UV curable acrylic polymer having a refractive index of 1.49 was applied to a thickness of 100 μm on a glass substrate having a thickness of 0.7 μm and a refractive index of 1.51. Next, a mold for forming a light-collecting portion having a trapezoidal shape with a cross-sectional shape of an upper base width of 30 μm, a lower base width of 50 μm, and a height of 50 μm was bonded to the coated surface and irradiated with UV. Thereafter, the mold was peeled off, and a condensing part having a trapezoidal shape with a cross-sectional shape of an upper base width of 30 μm, a lower base width of 50 μm and a height of 50 μm and a three-dimensional shape of a trapezoidal prism shape was formed on a glass substrate. The inclination angle of the side surface of this condensing part was 78.7 degrees.

[Example 4]
A top emission type organic EL panel was produced in the same manner as in Example 1 except that the counter substrate was produced as follows.

(Preparation of counter substrate)
A UV curable acrylic polymer having a refractive index of 1.49 was applied to a thickness of 70 μm on a glass substrate having a thickness of 0.7 μm and a refractive index of 1.51. Next, a mold for forming a light-collecting portion having a trapezoidal shape with a cross-sectional shape of an upper base width of 20 μm, a lower base width of 45 μm, and a height of 50 μm was bonded and irradiated with UV. Thereafter, the mold was peeled off, and a condensing part having a trapezoidal shape with a cross-sectional shape of an upper base width of 20 μm, a lower base width of 45 μm and a height of 70 μm and a three-dimensional shape of a trapezoidal prism shape was formed on a glass substrate. The inclination angle of the side surface of this condensing part was 71.1 degrees.

[Comparative Example 1]
A top emission type organic EL panel was produced in the same manner as in Example 1 except that a glass substrate on which a light collecting portion was not formed was used as the counter substrate.

[Comparative Example 2]
A top emission type organic EL panel was produced in the same manner as in Example 1 except that the counter substrate was produced as follows.

(Preparation of counter substrate)
Etching the glass substrate in the same manner as in Example 1 formed a condensing part having a triangular shape with a cross-sectional shape of a bottom of 45 μm and a height of 50 μm and a three-dimensional shape of a triangular prism.

[Comparative Example 3]
A top emission type organic EL panel was produced in the same manner as in Example 1 except that the counter substrate was produced as follows.

(Preparation of counter substrate)
The glass substrate was ground by the same blasting process as in Example 2 to form a condensing part having a triangular shape with a cross-sectional shape of a bottom of 45 μm and a height of 50 μm and a three-dimensional shape of a triangular prism.

[Comparative Example 4]
A top emission type organic EL panel was produced in the same manner as in Example 1 except that the counter substrate was produced as follows.

(Preparation of counter substrate)
By the same molding as in Example 3, a condensing portion having a triangular cross section having a bottom of 45 μm and a height of 50 μm and a three-dimensional shape being a triangular prism shape was formed.

[Evaluation]
The radiated light intensity of the organic EL panels of Examples 1 to 4 and the radiated light intensity of the organic EL panels of Comparative Examples 1 to 4 are shown in FIG. In the organic EL panels of Examples 1 to 4, it was confirmed that the emitted light intensity in the front direction was improved. In the organic EL panel of Comparative Example 1, it was confirmed that there was no light collecting effect because the light collecting part was not formed. Moreover, in the organic EL panels of Comparative Examples 2 to 4, it was confirmed that the emitted light intensity in the front direction was not improved and the emitted light intensity was uneven.

DESCRIPTION OF SYMBOLS 1 ... Organic EL panel 2 ... Supporting substrate 3 ... Back electrode layer 4 ... Light emitting layer 4R ... Red light emitting layer 4G ... Green light emitting layer 4B ... Blue light emitting layer 5 ... Transparent electrode layer 10 ... Organic EL substrate 11 ... Opposite substrate 12 ... Transparent Substrate 13 ... Condensing part 14 ... Optical member 15 ... Base part L ... Light P ... Pixel

Claims (3)

Organic having a support substrate, a back electrode layer formed on the support substrate, an organic electroluminescence layer formed on the back electrode layer and including a light emitting layer, and a transparent electrode layer formed on the organic electroluminescence layer An electroluminescent substrate;
An organic electroluminescence device comprising: a transparent substrate; and an optical member formed on the transparent substrate and having a plurality of condensing portions, wherein the optical member is disposed to face the organic electroluminescence substrate. A panel,
The condensing unit is formed for each pixel, the cross-sectional shape of the condensing section is Ri trapezoidal der,
The light emitting layer has a red light emitting layer, a green light emitting layer and a blue light emitting layer;
The condensing part formed for the red pixel corresponding to the red light emitting layer is the red condensing part, and the condensing part formed for the green pixel corresponding to the green light emitting layer is the green condensing part. Part, when the light collecting part formed for the blue pixel corresponding to the blue light emitting layer is a blue light collecting part,
2. The organic electroluminescence panel according to claim 1, wherein an inclination angle of a side surface of the blue light collecting portion is larger than an inclination angle of a side surface of the red light collecting portion and the green light collecting portion .   Organic having a support substrate, a back electrode layer formed on the support substrate, an organic electroluminescence layer formed on the back electrode layer and including a light emitting layer, and a transparent electrode layer formed on the organic electroluminescence layer An electroluminescent substrate;
  A transparent substrate, and an opposing substrate formed on the transparent substrate, the optical member having a plurality of condensing portions, and the optical member arranged to face the organic electroluminescence substrate;
  An organic electroluminescence panel having
  The condensing part is formed for each pixel, and the cross-sectional shape of the condensing part is a trapezoidal shape,
  The light emitting layer has a red light emitting layer, a green light emitting layer and a blue light emitting layer;
  The condensing part formed for the red pixel corresponding to the red light emitting layer is the red condensing part, and the condensing part formed for the green pixel corresponding to the green light emitting layer is the green condensing part. Part, when the light collecting part formed for the blue pixel corresponding to the blue light emitting layer is a blue light collecting part,
  The width of the upper bottom surface of the blue light collecting portion is smaller than the width of the upper bottom surface of the red light collecting portion and the green light collecting portion, or the width of the lower bottom surface of the blue light collecting portion is An organic electroluminescence panel characterized by being smaller than the width of the lower bottom surface of the red light condensing part and the green light condensing part. The organic electroluminescence panel according to claim 1, wherein the organic electroluminescence panel does not have a color filter.