JP5750955B2 - EL element, and illumination device, display device, and liquid crystal display device using the same - Google Patents

Description

  The present invention relates to an EL element (electroluminescence element) used for a flat panel display, a backlight for liquid crystal, a light source for illumination, an illumination, a light source for signage, and the like, and a display device, a display device, and a liquid crystal display using the EL element It relates to the device.

  In general, an organic EL has a structure in which a light-emitting layer containing a fluorescent organic compound is sandwiched between an anode and a cathode on a translucent substrate. Then, a DC voltage is applied to the anode and the cathode, electrons and holes are injected into the light emitting layer and recombined to generate excitons, and light emission when the excitons are deactivated is used. Leads to light emission.

  Conventionally, in these EL elements, when the light emitted from the light emitting layer is emitted from the light transmitting substrate, there is a problem that the light is totally reflected on the light transmitting substrate and the light is lost. The light extraction efficiency at this time is generally said to be about 20%. Therefore, there is a problem that the higher the luminance is, the more input power is required. In this case, the load on the element increases and the reliability of the element itself is lowered.

  In order to improve the external extraction efficiency of light, a method has been proposed in which fine irregularities are formed on an element substrate and a light beam lost due to total reflection is extracted to the outside. For example, it has been proposed to form a microlens array in which a plurality of microlens elements are arranged in a plane on one surface of a translucent substrate (see Patent Document 1).

In addition, the EL element has a problem of angle dependency of emission color.
This is a problem that the color visually recognized by the observer changes depending on the angle observed by the EL element (hereinafter, the problem is referred to as color misregistration). In particular, a configuration in which a light emitting layer is stacked like a multi-unit structure is a big problem (see Patent Document 2 and Non-Patent Document 1).

JP 2002-260845 A Japanese Patent Laid-Open No. 5-3079

Panasonic Electric Works Technical Report Vol. 57 No. 4 "High color rendering organic EL device for lighting"

When the organic EL is used for lighting applications, in addition to the above-described external light extraction efficiency, the elimination of color misregistration is also an important factor.
In order to eliminate the color misregistration of the organic EL element, a method of eliminating the color misregistration by generally covering the light source with a diffusion plate has been proposed. However, in such a method, since the light source is covered with the diffusion plate, light is absorbed by the diffusion plate, light loss occurs, and as a result, the light use efficiency decreases.
For this reason, there is a need for a method of providing a solution to color misregistration without reducing the light utilization efficiency.
The present invention has been made in view of such circumstances, and an EL element that eliminates color misregistration without reducing the efficiency of external extraction of light and reducing the use efficiency of light, and the same are used. An object is to provide an illumination device, a display device, and a liquid crystal display device.

In order to solve the above-described problem, the invention described in claim 1 includes a translucent substrate and a light emitting layer provided on one surface of the translucent substrate in a state sandwiched between an anode and a cathode. An EL element, a color correction sheet provided on the other surface of the translucent substrate via a bonding layer, and a light reflection provided on the opposite side of the color correction sheet with the light emitting layer interposed therebetween The color correction sheet includes at least a first color correction structure and a second color correction structure formed on a surface opposite to the bonding layer, wherein the shapes of the color correction sheets are different from each other. The first color correction structure includes a plurality of convex portions that are part of a substantially semicircular shape, and the cross-sectional shape of the convex portions is from a surface opposite to the bonding layer. TM / PM is 0.5 or less, where TM is the height of TM and the width of the base on the surface opposite to the bonding layer is PM. The second color correction structure includes a plurality of convex portions that are part of a polygonal prism such as a triangle or a substantially elliptical shape, and the cross-sectional shape of the convex portions is opposite to the bonding layer. When the height from the side surface is TL and the width of the bottom side of the surface opposite to the bonding layer is PL, TL / PL is 0.5 or more and 1 or less, and the junction of the hem of the convex portion layer and Ri der inclination angle θ is within 80 degrees 45 degrees with respect to the surface opposite to the convex portion constituting the second color correction structure is a lens, they lenses are arranged at a distance from each other, wherein The convex portion constituting the first color correction structure is a lens having a lower height than the lens constituting the second color correction structure, and these lenses are located between the lenses constituting the second color correction structure. The EL elements are arranged so as to fill the gaps .

The invention described in claim 2 is an EL device comprising a light-transmitting substrate and a light-emitting layer provided on one surface of the light-transmitting substrate in a state sandwiched between an anode and a cathode, A color correction sheet provided on the other surface of the translucent substrate via a bonding layer, and a light reflection layer provided on the opposite side of the color correction sheet with the light emitting layer interposed therebetween. The color correction sheet has at least two types of color correction structures having different shapes from each other, at least a first color correction structure and a second color correction structure formed on a surface opposite to the bonding layer, The first color correction structure is configured to include a plurality of convex portions that form a part of a substantially semicircular shape, and the cross-sectional shape of the convex portions is a height from a surface opposite to the bonding layer, TM, When the width of the base on the surface opposite to the bonding layer is PM, TM / PM is less than 0.5, and the second The correction structure is configured to include a polygonal prism such as a triangle or a plurality of convex portions forming a part of a substantially elliptical shape, and the cross-sectional shape of the convex portion has a height from a surface opposite to the bonding layer. TL, where PL is the width of the base on the surface opposite to the bonding layer, TL / PL is 0.5 or more and 1 or less, and the slope of the convex hem relative to the surface opposite to the bonding layer The angle θ is not less than 45 degrees and not more than 80 degrees, and the convex portions constituting the second color correction structure are lenses, and the lenses are arranged with a space therebetween to constitute the first color correction structure. The convex portion is a lens or prism extending in a columnar shape in one direction and having a height lower than that of the lens constituting the second color correction structure, and the plurality of lenses or prisms are the second color correction structure. Extend between them so as to fill in between the convex parts The EL element is characterized in that the directions are arranged so as to cross each other .

The invention described in claim 3 is an EL device comprising a light-transmitting substrate and a light-emitting layer provided on one surface of the light-transmitting substrate in a state sandwiched between an anode and a cathode, A color correction sheet provided on the other surface of the translucent substrate via a bonding layer, and a light reflection layer provided on the opposite side of the color correction sheet with the light emitting layer interposed therebetween. The color correction sheet has at least two types of color correction structures having different shapes from each other, at least a first color correction structure and a second color correction structure formed on a surface opposite to the bonding layer, The first color correction structure is configured to include a plurality of convex portions that form a part of a substantially semicircular shape, and the cross-sectional shape of the convex portions is a height from a surface opposite to the bonding layer, TM, When the width of the base on the surface opposite to the bonding layer is PM, TM / PM is less than 0.5, and the second The correction structure is configured to include a polygonal prism such as a triangle or a plurality of convex portions forming a part of a substantially elliptical shape, and the cross-sectional shape of the convex portion has a height from a surface opposite to the bonding layer. TL, where PL is the width of the base on the surface opposite to the bonding layer, TL / PL is 0.5 or more and 1 or less, and the slope of the convex hem relative to the surface opposite to the bonding layer The angle θ is not less than 45 degrees and not more than 80 degrees, and the convex portions constituting the second color correction structure are lenses, and the lenses are arranged with a space therebetween to constitute the first color correction structure. The convex portion is lower than the lens constituting the second color correction structure, the bottom is a polygonal convex lens having a polygon or the top is a polygonal concave lens having a polygon, and they are the same as the second color correction structure. Arranged without gaps so as to fill the gap between the convex parts It is an EL element characterized by having .

According to a fourth aspect of the present invention, there is provided the EL device according to any one of the first to third aspects, wherein the color correction sheet has a light diffusion function.
The invention of claim 5, wherein is an EL element according to claims 1 to 3, characterized in that it has a light diffusing function to the bonding layer.
A sixth aspect of the present invention is an illumination device comprising the EL element according to any of the first to fifth aspects as a light emitting means.
According to a seventh aspect of the present invention, there is provided a display device comprising the EL element according to any one of the first to fifth aspects, wherein the EL element is configured to be driven by a pixel. is there.
The invention according to claim 8 is a liquid crystal display device comprising an image display element, wherein the EL element according to any one of claims 1 to 5 is provided on a back surface of the image display element. A liquid crystal display device comprising the illumination device according to item 6 .

  By employing the EL element of the present invention, it is possible to provide an EL element having high light external extraction efficiency and no color shift.

Explanatory drawing which shows the outline of EL element of this invention Explanatory drawing which shows the outline when not using the color correction sheet | seat of this invention Explanatory drawing which shows one Embodiment of the color correction sheet | seat of this invention Explanatory drawing which shows the outline of the 1st color correction structure of this invention Explanatory drawing which shows the outline of the 2nd color correction structure of this invention Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention. Explanatory drawing which shows other embodiment of the color correction sheet | seat of this invention.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an EL element 101 (electroluminescence element) according to an embodiment of the present invention. As shown in FIG. 1, the EL element 101 includes a first substrate 1A, a second substrate 1B, a light emitting layer 2, an anode 3, a cathode 4, a color correction sheet 7, and the like. Yes.
In the color correction sheet 7, the irradiation direction F is the side opposite to the surface on which the light emitting layer 2 is installed.

  An anode 3 is formed on one surface of the light emitting layer 2 and a cathode 4 is formed on the other surface. The light emitting layer 2 emits light by applying a voltage to the anode 3 and the cathode 4. The light emitting structure 100 includes the light emitting layer 2, the anode 3, and the cathode 4. As the light emitting structure 100, various conventionally known configurations can be employed.

  The light emitting layer 2 may be a white light emitting layer, or may be a light emitting layer of blue, red, yellow, green, or the like. In the case of a white light emitting layer, the structure of the light emitting layer 2 is, for example, ITO / CuPc (copper phthalocyanine) / α-NPD doped with rubrene 1% / dinactylanthracene perylene 1% doped / Alq 3 / lithium fluoride. / The cathode may be made of Al.

  However, the present invention is not limited to this configuration, and an arbitrary configuration using an appropriate material capable of setting the wavelength of light emitted from the light emitting layer 2 to R (red), G (green), and B (blue). It is possible to adopt. In addition, when used in a full color display application, full color display is possible by separately applying three types of light emitting materials corresponding to R, G, and B, or by overlaying a color filter on white light.

  The first substrate 1A is formed on the surface opposite to the surface where the anode 3 faces the light emitting layer 2. The second substrate 1B is formed on the surface opposite to the surface where the cathode 4 faces the light emitting layer 2.

  As materials for the first substrate 1A and the second substrate 1B, various glass materials can be used, plastic materials such as PMMA, polycarbonate, polystyrene, or metal materials such as aluminum can be used. Although various other materials can be used, a cycloolefin-based polymer is particularly preferable, and this polymer has all processability and material properties such as heat resistance, water resistance, and optical translucency. Is excellent.

  Further, the first substrate 1A is preferably formed of a material capable of making the total light transmittance 50% or more so that light from the light emitting structure 100 (light emitting layer 2) can be transmitted as much as possible. .

  The color correction sheet 7 is provided on the surface opposite to the surface on which the first substrate 1 </ b> A faces the anode 3 via the adhesive layer 6. Examples of the adhesive / adhesive constituting the adhesive layer 6 include acrylic, urethane, rubber, and silicone adhesives / adhesives. In any case, since it is used adjacent to a light source having a high temperature, it is desirable that the storage elastic modulus G ′ is 1.0E + 04 (Pa) or more at 100 ° C. If the value is lower than this, the color correction sheet 7 and the first substrate 1A may be misaligned during use. If the color correction sheet 7 and the first substrate 1A are greatly deviated, light from the light emitting layer 2 does not enter the color correction sheet 7 efficiently, so that the light use efficiency is lowered.

  In order to stably secure a gap between the light emitting layer 2 and the color correction sheet 7, transparent fine particles such as beads may be mixed in the contact / adhesive layer. The adhesive may be a double-sided tape or a single layer.

  The color correction sheet 7 has a function of deflecting light from the light emitting layer 2 and emitting it in the irradiation direction F to improve the external extraction efficiency of the light. The color correction sheet 7 has a surface (surface opposite to the bonding layer 6) facing the first substrate 1A and a color correction structure layer 5 arranged on the surface. In other words, the EL element 101 includes a substrate 1A and a light emitting layer 2 provided on one surface of the substrate 1A and sandwiched between the anode 3 and the cathode 4. A color correction sheet 7 is provided on the other surface of the substrate 1A, and the color correction sheet 7 has a surface and a color correction structure layer 5 arranged on the surface.

  The light B0 emitted from the light emitting layer 2 passes through the substrate 1A (light B1) and enters the color correction structure layer 5.

As shown in FIG. 1, a part of the light B <b> 1 incident on the color correction structure layer 5 becomes light B <b> 2 emitted from the emission surface of the color correction structure layer 5 to the outside.
If the color correction structure layer 5 is not flat as shown in FIG. 2, most of the light B <b> 1 is reflected by the flat surface and becomes light B <b> 12 incident on the light emitting layer 2 again. Since the light B12 is not deflected in the irradiation direction F, the light B12 is lost.
Therefore, in order to improve the light extraction efficiency of the EL element 101, it is important to reduce the light B12 and increase the light B1.

  Further, the light from the light-emitting layer 2 has an angle dependency of the emission color as the emission angle increases. In particular, the light B101 having an emission angle of 50 degrees or more differs greatly in emission color from the light B100 in the vicinity of the front direction (emission angle 0 to 30 degrees), and thus color shift occurs.

As a conventional method for improving the light external extraction efficiency, there are a method of forming a structure such as a prism and a method of forming a substantially hemispherical microlens.
Moreover, as a method of solving the problem of color misregistration, there is a method of installing a diffusion film in which a rough surface is formed by applying a filler to a transparent substrate.

However, the method of forming a structure such as a prism or the method of forming a substantially hemispherical microlens has the following problems.
Color misregistration cannot be eliminated simply by providing a prism or microlens structure.
This is because the light B101 having an emission angle of 50 degrees or more and the light B100 in the vicinity of the front direction cannot be sufficiently mixed with a single-shaped prism or microlens.
For example, in the microlens shape, the light B100 in the vicinity of the front direction is emitted in the front direction of the EL element 101 without being largely deflected, and the light B101 having an emission angle of 50 degrees or more is not greatly deflected and the emission angle 50 of the EL element 101 is emitted. It is injected in the direction of more than degrees. For this reason, the light emitted from the EL element 101 has a different emission color as the emission angle increases, and there is a problem of color misregistration in which the observed color differs between the front direction and the direction with an emission angle of 50 or more.

The method of installing a diffusion film in which a rough surface is formed by applying a filler to a transparent substrate has the following problems.
In order to eliminate the above-described color misregistration, it is necessary to increase the diffusivity, and the diffusivity is insufficient in the surface diffusion in which the surface is simply an uneven surface.
There is also a method of providing diffusion particles inside the film. However, in order to eliminate the color shift by adding diffusion particles, it is necessary to add a large amount of diffusion particles. If a large amount of diffusing particles are added, light absorption occurs, which causes a problem that the light extraction efficiency decreases.

Therefore, the color correction sheet 7 shown in FIG. 3 is provided on the surface of the EL element 101 in order to improve the external light extraction efficiency of the EL element 101 and eliminate the color shift.
The color correction structure layer 5 of the color correction sheet 7 is different from the first color correction structure 40 and the second color that have different shapes for deflecting the light B0 emitted from the light emitting layer 2 and deflecting it in the irradiation direction F. And a correction structure 50. The first color correction structure 40 and the second color correction structure 50 may be arranged separately on the base material 8, or the first color correction structure 40 and the second color correction structure 50. And the base material 8 may be integrally molded.

FIG. 4 is a schematic diagram of the first color correction structure 40 of the present invention.
The first color correction structure 40 includes a plurality of convex portions that form a part of a substantially semicircular shape.
The cross-sectional shape of the convex portion is defined as TM when the height from the surface opposite to the bonding layer 6 of the first color correction structure 40 is TM, and the width of the base on the surface opposite to the bonding layer 6 is PM. / PM is less than 0.5.
By satisfying the above shape, the light B100 in the vicinity of the front direction becomes the light B200 emitted in the front direction of the first color correction structure 40 without being largely deflected.

The above phenomenon occurs because the tilt angle necessary for largely deflecting the light B100 in the vicinity of the front direction is small.
In order to largely deflect the light B100 in the vicinity of the front direction, an inclination angle of 45 degrees or more is required. For example, when the cross-sectional shape is considered as a semicircular shape having TM / PM of 0.5, a region having an inclination angle of 45 degrees or more is less than 30% with respect to the width PM. Therefore, if TM / PM is less than 0.5, the region where the inclination angle is 45 degrees or more is further reduced, and it becomes difficult to largely deflect the light B100 in the vicinity of the front direction.

  Further, in the first color correction structure 40, the light B101 having an emission angle of 50 degrees or more becomes light 201 emitted in the direction of the emission angle of 50 degrees or more of the EL element 101 without being largely deflected. Therefore, the light emitted from the first color correction structure 40 has a distribution of colors with different emission colors as the emission angle increases.

FIG. 5 is a schematic diagram of the second color correction structure 50 of the present invention.
The second color correction structure 50 includes a polygonal prism such as a triangle or a plurality of convex portions forming a part of a substantially elliptical shape.
The cross-sectional shape of the convex portion is TL when the height from the surface opposite to the bonding layer 6 of the second color correction structure 50 is TL and the width of the base on the surface opposite to the bonding layer 6 is PL. / PL is 0.5 or more and 1 or less, and the inclination angle θ with respect to the surface on the side opposite to the bonding layer at the bottom of the convex portion is 45 degrees or more and 80 degrees or less.
By satisfying the above-described shape, the light B100 in the vicinity of the front direction is largely deflected and becomes the light B301 having a large emission angle.

The light B100 in the vicinity of the front direction is incident on the slope of the convex portion constituting the second color correction structure 50, is totally transmitted without being transmitted, and becomes the light B300. The light B300 is incident on the slope that makes a pair with the first incident slope, is refracted and transmitted, and becomes the light B301 having a large emission angle.
As described above, in order to greatly deflect the light B100 in the vicinity of the front direction to obtain the light B301 having a large emission angle, TL / PL is 0.5 or more and the inclination angle θ of the skirt of the convex portion is 45 degrees. It is necessary to be above.
When the skirt inclination angle θ is less than 45 degrees, the generation of light B300 due to total reflection is reduced.
If TL / PL is less than 0.5, the light B300 cannot be incident on the inclined surface that makes a pair with the first incident surface, and repeats total reflection and returns to the light emitting layer side, or a color correction sheet. The light is guided through the light and cannot be extracted outside, resulting in a loss.

Furthermore, the cross-sectional shape of the convex portions constituting the second color correction structure 50 needs to have a skirt inclination angle θ of 80 degrees or less and TL / PL of 1 or less.
When the skirt inclination angle θ exceeds 80 degrees, the light B300 by total reflection has a sufficient angle with respect to the front direction and is not deflected. Therefore, it cannot enter the slope that makes a pair with the first incident slope and repeats total reflection and returns to the light emitting layer side, or becomes light that is guided through the color correction sheet and cannot be extracted outside, resulting in loss. End up.
When TL / PL exceeds 1, the light B301 having a large emission angle enters the adjacent second color correction structure 50 and returns to the light emitting layer side, or is guided through the color correction sheet. It will be lost without being taken out.

  Therefore, the cross-sectional shape of the convex portions constituting the second color correction structure 50 needs to have TL / PL of 0.5 or more and 1 or less and the skirt inclination angle θ of 45 degrees or more and 80 degrees or less.

Further, in the second color correction structure 50, the light B101 having an emission angle of 50 degrees or more becomes light 302 emitted in the direction of the emission angle 50 degrees or more of the second color correction structure 50 without being largely deflected.
The emission angle of the light 301 is larger than or substantially equal to the emission angle of the light 302.
For this reason, the light emitted from the second color correction structure 50 has a color distribution in which the emission color is a mixture of the light B100 and the light B101 when the emission angle increases.

Since the first color correction structure 40 and the second color correction structure 50 have different deflection directions of the light B100 in the vicinity of the front direction, they have a symmetric color distribution.
Each single structure causes a problem of color misregistration, but having two types of color correction structures having contrasting color distributions makes it possible to cancel each other's color distribution characteristics, resulting in color misregistration. It becomes possible to solve the problem.

It is more preferable that the inclination angle θ of the convex portions constituting the second color correction structure 50 is 60 degrees or more and 80 degrees or less.
This is because the emission angle of the light B301 becomes larger, and the color distributions of the first color correction structure 40 and the second color correction structure 50 become more symmetric.

As shown in an example in FIG. 3, the color correction structure layer 5 is, for example, one surface of a sheet-like translucent substrate 8, in other words, a surface opposite to the bonding layer 6, that is, a surface in the irradiation direction F ( For example, a plurality of substantially hemispherical microlenses are formed in a part of the region 8a as convex portions constituting the first color correction structure 40 on the surface 8a.
For example, as shown in FIG. 3B, the convex portion constituting the second color correction structure 50 is a lens having a convex cross section so as to fill the gap between the convex portions constituting the first color correction structure 40. Alternatively, it forms a prism shape and has a belt shape (columnar shape) extending in one direction, and the belt-like convex lens or prism shape extends between the first color correction structures 40 so that the extending directions thereof are mutually. You may arrange so that it may cross.
When the convex portions constituting the second color correction structure 50 have a strip shape (columnar shape) extending in one direction, for example, when the convex portion is a prism lens having a triangular cross section, the prism lens extends in the same direction over the entire surface 8a. A plurality of microlenses that are formed in an array and that form the convex portion of the first color correction structure 40 overlap with a part of the prism lens that forms the convex portion of the second color correction structure 50. .

For example, as shown in FIG. 3B, the convex portion constituting the second color correction structure 50 forms a lens or prism shape having a convex cross section, and has a belt shape extending in one direction. It is preferable that the belt-like convex lenses or prism shapes are arranged so as to intersect each other between the lenses that are arranged at a distance from each other and that constitute the first color correction structure 40.
If the first color correction structure 40 has a belt-like shape extending in one direction without crossing between the lenses constituting the first color correction structure 40, and the one direction extending, the first color correction structure 40 is There is a problem that the inclination does not have an inclination angle, that is, is equivalent to a planar effect, and cannot be extracted to the outside like the light B12 illustrated in FIG.
Therefore, the cross-section forms a convex lens or prism shape and has a strip shape extending in one direction, and the strip-shaped convex lens or prism shape crosses between the first color correction structures 40. By arranging in such a manner, it is possible to provide an inclination angle with respect to the two-dimensional direction.
Furthermore, by arranging as described above, it is possible to adjust the light distribution of the light emitted from the second color correction structure 50 in the irradiation direction F in a two-dimensional direction. Therefore, by making the lens constituting the second color correction structure 50 have an arbitrary shape, the light emitted from the second color correction structure 50 has a symmetric light distribution or an asymmetric light distribution. It is preferable because it becomes possible.

  In FIG. 3, the convex portion constituting the first color correction structure 40 has a diameter in contact with the surface 8a of the substrate 8 as PM and a height with respect to the surface 8a of the substrate 8 as TM. In the second color correction structure 50, the width of the bottom contacting the surface 8a is PL, the height from the surface 8a to the top is TM, and the skirt of the convex portion is the inclination angle with respect to the surface 8a.

The convex portions constituting the first color correction structure 40 have a microlens shape and are regularly arranged with a plurality of equal intervals or irregularly with an unequal interval. As a convex part which comprises this 1st color correction structure 40, a substantially hemispherical thing is mentioned.
In addition, the longest diameter PM, which is the longest width among the widths along the surface 8a of the substrate 8 of the first color correction structure 40, is set to 20 μm or more and 200 μm or less. When the longest diameter PM is less than 20 μm, diffracted light is generated at the convex portions constituting the first color correction structure 40, and the light B1 incident on the convex portions constituting the first color correction structure 40 is deflected in the irradiation direction F. This is not preferable because the efficiency of the process is reduced. When the longest diameter PM exceeds 200 μm, the first color correction structure 40 becomes large and is visually recognized by an observer.
The distance between the centers of the convex portions constituting the adjacent first color correction structures 40 is preferably 50 μm or more and 5000 μm or less.

  Then, a plurality of convex portions constituting the second color correction structure 50 are provided so as to fill in the spaces between the convex portions constituting the first color correction structure 40 arranged in this way. Note that the convex portions constituting the first color correction structure 40 are not adjacent to each other and the convex portions constituting the first color correction structure 40 are adjacent to each other. The plurality of convex portions constituting the first color correction structure 40 are arranged in contact with each other.

  As shown in FIG. 6A, the convex portions constituting the second color correction structure 50 as described above have a convex first prism 61 formed at a predetermined pitch, and the first And a convex second prism 62 formed in a direction substantially orthogonal to the first prism 61.

The prism sheet in which the prisms are arranged in one direction distributes the light B1 incident on the convex portions constituting the second color correction structure 50 of the color correction structure layer 5 in the direction in which the lenses are arranged by the slope of the prism. It is possible to control the distribution. Therefore, when prisms arranged in one direction are used for the convex portions constituting the second color correction structure 50, the light distribution can be adjusted one-dimensionally. However, when the EL element 101 is used for illumination, it is necessary to adjust the light distribution at least two-dimensionally. The reason is that, for example, depending on the installation location of the lighting device, there is no need to irradiate in a specific direction, and there is a case where a luminance improvement in the front direction is required instead of a wide light distribution. Alternatively, when the light B1 incident on the convex portion constituting the second color correction structure 50 of the color correction structure layer 5 has an asymmetric light distribution, and the light distribution of the light emitted from the illumination device is When it is required to have a symmetric light distribution, it is difficult to make the light distribution of the light emitted from the illumination device a symmetric light distribution by adjusting only the one-dimensional direction. The configuration of the present invention that can be adjusted is preferable.
Moreover, in the cross prism in which the prisms are arranged substantially orthogonally as in the configuration of the present invention, the light distribution is adjusted to an appropriate light distribution without newly adding a lens sheet in order to spread the light two-dimensionally. Therefore, it is possible to reduce the weight, thickness, and cost of the lighting device.

  It is preferable that the slopes of the first prism 61 and the second prism 62 that are convex portions constituting the second color correction structure 50 have a linear shape. The linear shape allows the light B1 incident on the convex portions constituting the second color correction structure 50 of the color correction structure layer 5 to be deflected in substantially the same direction. It is possible to collect light.

  Further, the shapes of the first prism 61 and the second prism 62 which are convex portions constituting the second color correction structure 50 may be the same or different.

  Alternatively, as shown in FIG. 7A, the convex portions constituting the second color correction structure 50 are convex first cylindrical lenses 61 formed at a predetermined pitch and the first cylindrical lenses. Alternatively, a convex second cylindrical lens 62 formed in a direction substantially orthogonal to 61 may be used.

In the lenticular lens sheet in which the cylindrical lenses are arranged in one direction, the light B1 incident on the convex portions constituting the second color correction structure 50 of the color correction structure layer 5 is arranged in the direction in which the lenses are arranged. It is possible to control the light distribution. Therefore, when a lenticular lens sheet is used for the second color correction structure 50, the light distribution can be adjusted one-dimensionally. However, when used for illumination, it is necessary to adjust the light distribution at least two-dimensionally. The reason is that, for example, depending on the installation location of the lighting device, there is no need to irradiate in a specific direction, and there is a case where a luminance improvement in the front direction is required instead of a wide light distribution. Alternatively, when the light B1 incident on the convex portion constituting the second color correction structure 50 of the color correction structure layer 5 has an asymmetric light distribution, and the light distribution of the light emitted from the illumination device is When a symmetrical light distribution is required, it is difficult to adjust only in the one-dimensional direction. Therefore, the configuration of the present invention capable of adjusting in the two-dimensional direction is preferable.
Moreover, in the cross lenticular lens sheet in which the cylindrical lenses constituting the second color correction structure 50 are arranged substantially orthogonally as in the configuration of the present invention, a new lens sheet is used to spread light in a two-dimensional manner. It is possible to adjust to an appropriate light distribution without adding, and it is also possible to reduce the weight, thickness, and cost of the lighting device.

  The cross-sectional shapes of the first cylindrical lens 61 and the second cylindrical lens 62 that are convex portions constituting the second color correction structure 50 are not completely semicircular (spherical lens) but semi-elliptical (elliptical lens). ), A so-called non-semicircular (so-called second-order aspheric shape) such as a parabolic shape (parabolic lens), and a higher-order aspheric shape having a second-order term and the like are preferable.

  By using an aspherical lens as the convex portion constituting the second color correction structure 50, the area of the region having an appropriate inclination on the side surface of the lens can be adjusted, compared with a complete semicircular lens. , More outgoing light can be adjusted.

  Further, the shapes of the first cylindrical lens 61 and the second cylindrical lens 62 which are convex portions constituting the second color correction structure 50 may be the same or different.

In addition, as shown in FIGS. 8 to 13, for example, as shown in FIGS. 8 to 13, the convex portion constituting the second color correction structure 50 is a polygonal pyramidal convex lens having a polygonal base arranged on one side of the base material 8 without a gap. A pyramidal concave lens may be used.
By arranging without any gap, the flatness between the convex portions constituting the second color correction structure 50 not imparted to the deflection of the light B1 incident on the convex portions constituting the second color correction structure 50 of the color correction structure layer 5 is achieved. Accordingly, it is possible to substantially eliminate the portion, so that the light extraction efficiency of the EL element 101 can be further increased. In addition, since the fine structure due to the flat portion is not formed by arranging without any gap, it is possible to prevent the occurrence of color unevenness due to the light diffraction phenomenon.
As a method of arranging without any gap, the bottom surface 9 on the surface 8a of the convex portion constituting the second color correction structure 50 is formed as a regular hexagon (FIG. 9A), a square (FIG. 9B), a regular triangle ( 9C), the bottom surface 9 can be arranged with substantially the same shape. By making the shape of the bottom surface 9 substantially the same, it is possible to make the dimensions and shape of the convex portions constituting the second color correction structure 50 substantially the same, so that in-plane unevenness of brightness does not occur. Since the element 101 can be formed, it is preferable when the EL element 101 that does not cause in-plane unevenness of brightness is required.
In particular, when the bottom surface 9 is a regular hexagon, the shape of the connecting portion between the bottom surfaces 9 can be a more complicated zigzag shape instead of a linear shape. This is more preferable because it is possible to prevent moiré caused by interference between the shape of the connecting portion and the pixel pattern of the EL element 101.

Moreover, as shown in FIG. 10, you may arrange | position the bottom face 9 without a gap combining a different polygon.
When there is a demand for reducing unevenness of brightness within the surface of the EL element 101, the shape of the bottom surface 9 is preferably substantially the same. It is preferable that the shapes of the bottom surfaces 9 are substantially the same because unevenness of the light distribution of the second color correction structures 50 does not occur.

  FIGS. 11 to 13 are diagrams illustrating an example in which the second color correction structure 50 is a polygonal pyramidal convex lens or a polygonal pyramidal concave lens.

In FIG. 11, the convex portions constituting the second color correction structure 50 are arranged without gaps in the shape of a quadrangular pyramidal convex lens having a bottom surface 9 having a square shape.
When there is a demand to make the light distribution of the light emitted from the EL element 101 symmetrical, it is preferable that the bottom surface 9 is substantially square and the inclination angles of the four inclined surfaces of the quadrangular pyramidal convex lens 52 are substantially the same.
When there is a demand for making the light distribution of the light emitted from the EL element 101 asymmetric, the bottom surface 9 may be a quadrangular pyramid convex lens having a long side and a short side. By making the bottom surface 9 rectangular, the inclination angle of the short pyramid convex lens 52 in the short side direction is different from the inclination angle of the quadrangular pyramid convex lens 52 in the long side direction, so the light distribution of the light emitted from the EL element 101 can be changed. It becomes possible to make it asymmetric between the long side direction and the short side direction.

In FIG. 12, the convex portion constituting the second color correction structure 50 has a substantially quadrangular pyramid convex lens shape, and at the top of the quadrangular pyramid convex lens 52, at least one groove 51 having a substantially V-shaped cross section is formed. And have a plurality of vertices 52 that are divided. Two grooves 51 are formed so as to be orthogonal to the top of each quadrangular pyramidal convex lens 52 so that each quadrangular pyramidal convex lens 52 has four apexes 53. However, the method of forming the grooves is not limited to this, and the grooves 51 having various depths, pitches, and opening angles extending in various directions can be provided.
As described above, the light distribution can be adjusted by making the two grooves 51 orthogonal to the top of the substantially pyramidal convex lens shape. In particular, it is possible to adjust the light emitted at a wide angle where the emission angle is 60 degrees or more. By adjusting the shape (depth, inclination angle) of the groove 51, it is possible to increase or decrease the light emitted at a wide angle. This is because most of the light emitted at a wide angle is light emitted from the vicinity of the top of the quadrangular pyramid convex lens.

In FIG. 13, the convex portions constituting the second color correction structure 50 are arranged without gaps in the form of a quadrangular pyramidal concave lens having a rectangular bottom surface. The convex portion constituting the second color correction structure 50 having the shape of the quadrangular pyramid concave lens emits the light B1 incident on the convex portion constituting the second color correction structure 50 of the color correction structure layer 5 in the irradiation direction F. It is for taking out. In addition, in the convex part which comprises the 2nd color correction structure 50, a quadrangular pyramid concave lens shape is a quadrangular pyramid whose shape of the highest position of the convex part which comprises the 2nd color correction structure 50 shown in FIG. 9 is a point. Since the shape of the highest position of the convex part which comprises the 2nd color correction structure 50 is a line rather than a convex lens shape, since abrasion resistance improves, it is more preferable.
When there is a demand to make the light distribution of the light emitted from the EL element 101 symmetrical, it is preferable that the bottom surface is substantially square and the inclination angles of the four inclined surfaces of the quadrangular pyramidal concave lens are substantially the same.
If there is a need to make the light distribution of the light emitted from the EL element 101 asymmetric, the rectangular pyramidal concave lens 54 may have a rectangular bottom surface with long and short sides. By making the bottom surface rectangular, the inclination angle of the short pyramid concave lens 54 in the short side direction is different from the inclination angle of the quadrangular pyramid concave lens in the long side direction. It becomes possible to make it asymmetric between the direction and the short side direction.

  When the convex portion constituting the second color correction structure 50 has a prism lens shape or a quadrangular pyramid shape, the top end portion of the convex portion may be cut and flattened, or may be rounded and curved. . Further, two side surfaces forming a prism shape or four inclined surfaces forming a quadrangular pyramid shape may be curved into a convex curved surface shape or a concave curved surface shape.

  The width PL along one side (surface 8a) of the convex base material 8 constituting the second color correction structure 50, that is, the width of the base of the cross-sectional triangle in the case of a prism lens, and the semi-elliptical cross section in the case of a cylindrical lens The width of the straight portion of the shape, or in the case of a quadrangular pyramid shape, the width of one side of the bottom surface is 20 μm or more so that diffracted light hardly occurs at the convex portions constituting the second color correction structure 50 and is difficult to be seen from the irradiation direction , Within 200 um.

  In order to improve the external extraction efficiency of the desired light of the color correction sheet 7, the height ratio between the convex portions constituting the first color correction structure 40 and the convex portions constituting the second color correction structure 50, The ratio of the convex portion constituting the first color correction structure 40 and the convex portion constituting the second color correction structure 50 to the base material 8 can be appropriately adjusted.

  As shown in FIGS. 14 to 15, the color correction sheet 7 can be provided with an arrangement pattern of convex portions constituting the first color correction structure 40.

As shown in FIG. 14, the convex portions constituting the first color correction structure 40 may be arranged substantially uniformly to provide an arrangement pattern that does not cause unevenness. In this case, the array of convex portions constituting the first color correction structure 40 may form a square lattice as shown in FIG. 14 (a), and a triangular lattice as shown in FIG. 14 (b). It may be formed. When formed in a triangular lattice, it is possible to arrange the first color correction structure with a shortest distance between the convex portions constituting the adjacent first color correction structure 40 smaller than that of the square lattice. This is preferable because the maximum value of the density of the convex portions constituting 40 can be increased.
Further, as shown in FIG. 14C, the convex portions constituting the first color correction structure 40 may be arranged irregularly as a whole. When the pixel pattern is provided in the EL element 101 by irregular arrangement, the pixel pattern is generated by interference between the design pattern of the convex portion constituting the first color correction structure 40 and the EL element 101. Moire can be prevented, which is more preferable.

  Further, as a design pattern in which the convex portions constituting the first color correction structure 40 are uniformly arranged, as shown in FIG. 15, the shape of the first color correction structure 40 such as the inclination angle is similar and has a size. Different things may be arranged.

Furthermore, the color correction sheet of the present invention includes a plurality of second color corrections that are arranged on the other surface opposite to the one surface on which the light emitting layer is provided and spaced apart from each other, and each constitutes a lens. A lens having a height lower than that of the convex portion constituting the second color correction structure and arranged between the convex portion constituting the structure and the convex portion constituting the second color correction structure; The structure which has the 1st color correction structure to comprise may be sufficient.
In this case, as the convex portions constituting the second color correction structure, a substantially elliptical sphere shape having an aspect ratio of 0.5 or more and an inclination angle θ of 45 degrees or more, or a part of a substantially elliptical sphere shape, a conical shape It is possible to adopt a polygonal pyramid shape such as a triangular pyramid shape and a quadrangular pyramid shape.
In addition, it is possible to adopt a substantially semicircular shape or a part of a semicircular shape having an aspect ratio of less than 0.5 as the cross-sectional shape of the convex portion constituting the first color correction structure.

As a material for molding the color correction sheet 7, a material having light transmittance with respect to the wavelength of light emitted from the light emitting layer 2 is used, and for example, a plastic material that can be used for an optical member is used. Can do.
Examples of this material include polyester resin, acrylic resin, polycarbonate resin, polystyrene resin, MS (acrylic and styrene copolymer) resin, polymethylpentene resin, thermoplastic resin such as cycloolefin polymer, or polyester acrylate. And transparent resins such as radiation curable resins composed of oligomers such as urethane acrylate and epoxy acrylate, or acrylates. Further, depending on the application, fine particles may be dispersed in the transparent resin.
As the fine particles, particles made of an inorganic oxide or particles made of a resin can be used. For example, transparent particles made of an inorganic oxide include particles made of silica, alumina, titanium oxide, or the like. The transparent particles made of resin include acrylic particles, styrene particles, styrene acrylic particles and cross-linked products thereof, melamine-formalin condensate particles, PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxy resin), FEP (tetrafluoroethylene). Examples thereof include fluorine-containing polymer particles such as fluoroethylene monohexafluoropropylene copolymer), PVDF (polyfluorovinylidene), and ETFE (ethylene monotetrafluoroethylene copolymer), and silicone resin particles. These fine particles may be used as a mixture of two or more.

The color correction sheet 7 is molded by pouring such a material into a mold and solidifying it. As a method for producing this mold, first, a lacquer in which carbon black is dispersed in a resin is applied to a copper-plated mold by a spray method, and then an infrared laser with a wavelength of 1060 nm is irradiated to sublimate the lacquer. Let Thereafter, a die is attached to the iron chloride chromic acid solution to corrode copper in an isotropic shape in the depth direction and the width direction, and a portion corresponding to the first color correction structure 40 is produced. Next, a diamond tool having various lens shapes is used for the mold, and the cross-sectional shape is cut into a triangular shape to produce a portion corresponding to the second color correction structure 50.
In addition to the method of producing the color correction sheet 7 using such a mold, the first color correction structure 40, the second color correction structure 50, and the base material 8 can be formed by using a thermoplastic resin or an ultraviolet curable resin. It can be molded by extrusion molding, injection molding, UV molding, or the like, using a resin and a mold having the above shape. At this time, the first color correction structure 40, the second color correction structure 50, and the base material 8 may be molded separately or may be molded as an integrated product. Further, when the first color correction structure 40, the second color correction structure 50, and the substrate 8 are molded, a diffusing agent such as a filler can be dispersed therein and molded.

  As the antistatic agent, ultrafine particles such as antimony-containing tin oxide (hereinafter referred to as ATO) or tin-containing indium oxide (ITO), which are conductive fine particles, may be dispersed. By dispersing the antistatic agent, the antifouling property of the color correction sheet 7 can be improved.

When the color correction structure layer 5 molds the base material 8 separately as in the UV molding method, the base material 8 is a transparent film and is made of cellulose triacetate, polyester, polyamide, polyimide, polypropylene, polymethylpentene. A stretched or unstretched film of a thermoplastic resin such as polyvinyl chloride, polyvinyl acetal, methyl polymethacrylate, polycarbonate, or polyurethane can be used.
Although the thickness of the base material 8 depends on the rigidity of the base material 8, a thickness of 50 to 300 μm is preferable from the viewpoint of handling such as workability.

In addition, when the color correction structure layer 5 does not adhere firmly to the base material 8 or the adhesive force is reduced due to external influences such as cold, moisture absorption and desorption, the color correction structure layer 5 is attached to the base material 8. Between them, a primer layer having high adhesion to both materials may be provided, or the action of the primer layer may be added to the color correction structure layer 5.
Alternatively, an easy adhesion process such as a corona discharge process may be performed.

  In addition, although the typical example about the color correction sheet | seat 7 was demonstrated, if the optical characteristic of this embodiment can be achieved, it can also produce using materials, structures, processes, etc. other than the above. .

Example 1
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section is TM / PM of 0.49.
The convex portions of the second color correction structure are formed as a plurality of triangular prisms extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to fill the spaces between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.5, and the inclination angle θ was 45 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

(Comparative Example 1)
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section has a TM / PM of 0.5.
The convex portions of the second color correction structure are formed as a plurality of triangular prisms extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to fill the spaces between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.5, and the inclination angle θ was 45 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

(Comparative Example 2)
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section is TM / PM of 0.49.
The convex portions of the second color correction structure are formed as a plurality of triangular prisms extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to fill the spaces between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.42, and the inclination angle θ was 40 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

(Comparative Example 3)
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section is TM / PM of 0.49.
The convex portions of the second color correction structure are used as a plurality of cylindrical lenses extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to be filled between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.49, and the inclination angle θ was 45 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

(Example 2)
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section is TM / PM of 0.49.
The convex portions of the second color correction structure are used as a plurality of cylindrical lenses extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to be filled between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.1, and the inclination angle θ was 60 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

(Example 3)
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section is TM / PM of 0.49.
The convex portions of the second color correction structure are used as a plurality of cylindrical lenses extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to be filled between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.1, and the inclination angle θ was 80 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

(Comparative Example 4)
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section is TM / PM of 0.49.
The convex portions of the second color correction structure are used as a plurality of cylindrical lenses extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to be filled between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.1, and the inclination angle θ was 85 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

(Comparative Example 5)
A PET film (thickness: 188 μm) was used as the substrate 11, and a light redistribution sheet 1 shown in FIG. 3 was prepared by a UV molding method using a UV curable resin having a refractive index of 1.52.
The convex portion of the first color correction structure has a substantially hemispherical shape, and the cross section is TM / PM of 0.49.
The convex portions of the second color correction structure are used as a plurality of cylindrical lenses extending in a columnar shape in one direction, and the extending directions of the convex portions of the second color correction structure are set so as to be filled between the convex portions constituting the first color correction structure. They were arranged so as to cross each other, the cross-sectional shape was TL / PL of 0.11, and the inclination angle θ was 80 degrees.
The color correction sheet was bonded to an EL element, and the degree of color shift was observed visually.

  Table 1 shows the results of Examples and Comparative Examples.

  When Examples 1 to 3 and Comparative Examples 1 to 5 are compared, in the present invention, TM / PM is less than 0.5, TL / PL is 0.5 or more and 1 or less, and the inclination angle θ is It was confirmed that the problem of color misregistration was solved by setting the angle to 45 degrees or more and 80 degrees or less.

  Furthermore, when Example 1 was compared with Examples 2-3, it was confirmed that the effect of color misregistration was further increased by setting the inclination angle θ to 60 degrees or more and 80 degrees or less.

  DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 2 ... Light emitting layer, 3 ... Anode, 4 ... Cathode, 5 ... Structural layer, 6 ... Adhesive layer, 7 ... Light control sheet, 8 ... Base material, 8a ... Base material surface, 8b ... Base material back surface, DESCRIPTION OF SYMBOLS 9 ... Bottom surface, 40 ... 1st uneven part, 50 ... 2nd uneven part, 51 ... Groove, 52 ... Square pyramid convex lens, 53 ... Vertex, 54 ... Square pyramid concave lens, 61 ... 1st cylindrical (prism) lens, 62 ... second cylindrical (prism) lens, 100 ... light emitting structure, 101 ... EL element, θ ... tilt angle, B0, B1, B2, B3, B4, B5, B12, B100, B101, B200, B201, B300, B301, 302... Light, PM..., Width of the convex portion constituting the first color correction structure, PL..., Width of the convex portion constituting the second color correction structure, TM. Height of the part, TL ... Height of the convex part constituting the second color correction structure

Claims (8)

An EL device comprising: a light-transmitting substrate; and a light-emitting layer provided on one surface of the light-transmitting substrate in a state sandwiched between an anode and a cathode,
A color correction sheet provided on the other surface of the translucent substrate via a bonding layer, and a light reflection layer provided on the opposite side of the color correction sheet with the light emitting layer interposed therebetween. ,
The color correction sheet has at least two types of color correction structures having different shapes from each other of at least a first color correction structure and a second color correction structure formed on a surface opposite to the bonding layer,
The first color correction structure is configured to include a plurality of convex portions forming a part of a substantially semicircular shape,
The cross-sectional shape of the convex portion is such that TM / PM is less than 0.5 when the height from the surface opposite to the bonding layer is TM and the width of the base on the surface opposite to the bonding layer is PM. And
The second color correction structure includes a plurality of convex portions that are part of a polygonal prism such as a triangle or a substantially elliptic shape,
The cross-sectional shape of the convex portion is such that TL / PL is 0.5 or more when the height from the surface opposite to the bonding layer is TL and the width of the base on the surface opposite to the bonding layer is PL. 1 within, and Ri inclination angle θ is 45 degrees 80 degrees within der against the surface opposite to the bonding layer of the skirt of the convex portion,
The convex portions constituting the second color correction structure are lenses, and the lenses are arranged at intervals from each other,
The convex portion constituting the first color correction structure is a lens having a lower height than the lens constituting the second color correction structure, and these lenses are the lenses of the lens constituting the second color correction structure. Arranged to fill the gaps,
An EL element. An EL device comprising: a light-transmitting substrate; and a light-emitting layer provided on one surface of the light-transmitting substrate in a state sandwiched between an anode and a cathode,
A color correction sheet provided on the other surface of the translucent substrate via a bonding layer, and a light reflection layer provided on the opposite side of the color correction sheet with the light emitting layer interposed therebetween. ,
The color correction sheet has at least two types of color correction structures having different shapes from each other of at least a first color correction structure and a second color correction structure formed on a surface opposite to the bonding layer,
The first color correction structure is configured to include a plurality of convex portions forming a part of a substantially semicircular shape,
The cross-sectional shape of the convex portion is such that TM / PM is less than 0.5 when the height from the surface opposite to the bonding layer is TM and the width of the base on the surface opposite to the bonding layer is PM. And
The second color correction structure includes a plurality of convex portions that are part of a polygonal prism such as a triangle or a substantially elliptic shape,
The cross-sectional shape of the convex portion is such that TL / PL is 0.5 or more when the height from the surface opposite to the bonding layer is TL and the width of the base on the surface opposite to the bonding layer is PL. 1 and an inclination angle θ with respect to the surface on the opposite side of the bonding layer at the bottom of the convex portion is 45 degrees or more and 80 degrees or less,
The convex portions constituting the second color correction structure are lenses, and the lenses are arranged at intervals from each other,
The convex portion constituting the first color correction structure is a lens or prism extending in a columnar shape in one direction and having a height lower than that of the lens constituting the second color correction structure. The EL element , wherein the prisms are arranged so that their extending directions intersect with each other so as to fill in between the convex portions constituting the second color correction structure . An EL device comprising: a light-transmitting substrate; and a light-emitting layer provided on one surface of the light-transmitting substrate in a state sandwiched between an anode and a cathode,
A color correction sheet provided on the other surface of the translucent substrate via a bonding layer, and a light reflection layer provided on the opposite side of the color correction sheet with the light emitting layer interposed therebetween. ,
The color correction sheet has at least two types of color correction structures having different shapes from each other of at least a first color correction structure and a second color correction structure formed on a surface opposite to the bonding layer,
The first color correction structure is configured to include a plurality of convex portions forming a part of a substantially semicircular shape,
The cross-sectional shape of the convex portion is such that TM / PM is less than 0.5 when the height from the surface opposite to the bonding layer is TM and the width of the base on the surface opposite to the bonding layer is PM. And
The second color correction structure includes a plurality of convex portions that are part of a polygonal prism such as a triangle or a substantially elliptic shape,
The cross-sectional shape of the convex portion is such that TL / PL is 0.5 or more when the height from the surface opposite to the bonding layer is TL and the width of the base on the surface opposite to the bonding layer is PL. 1 and an inclination angle θ with respect to the surface on the opposite side of the bonding layer at the bottom of the convex portion is 45 degrees or more and 80 degrees or less,
The convex portions constituting the second color correction structure are lenses, and the lenses are arranged at intervals from each other,
The convex portions constituting the first color correction structure are lower than the lenses constituting the second color correction structure, the bottom is a polygonal convex lens with a polygon or the top is a polygonal concave lens with a polygon, Are arranged without gaps so as to fill in the gaps between the convex portions constituting the second color correction structure . EL element according to claims 1 to 3, characterized in that it has a light diffusing function to the color correction sheet. EL element according to claims 1 to 3, characterized in that it has a light diffusing function to the bonding layer. Lighting apparatus characterized by comprising an EL element described as a light-emitting device to any one of claims 1 to 5. Comprising an EL element as claimed in any one of claims 5, a display device in which the EL element is characterized by being configured to be driven pixel. A liquid crystal display device comprising an image display element,
A liquid crystal display device comprising the EL element according to any one of claims 1 to 5 or the illumination device according to claim 6 provided on a back surface of the image display element.

Images