JP2013214365A - Organic el display device and organic el display device color change correction filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color change film which can be easily attached to product or replaced after shipment from the factory and an organic electroluminescent display device which has the color change film fitted thereto.SOLUTION: A filter layer which, in an emission spectrum distribution indicating the distribution of luminous intensity of light emitted in the normal direction of a display screen, has a minimum value of transmittance in a wavelength region shorter in wavelength than the wavelength of light corresponding to the maximum value of the luminous intensity in which region the luminous intensity exceeds 0, the filter layer having a minimum point of transmittance especially in at least one of a wavelength range 400 nm to 440 nm, a wavelength range 480 nm to 520 nm, and a wavelength range 560 nm to 610 nm, is fitted to the display screen of the organic electroluminescent display device. Or, the filter layer is turned into a pattern, whereby the view angle dependency of display colors of the display device is improved and further the front luminance is bettered.

Description

  The present invention relates to an organic EL display device in which a filter layer having a function of correcting the display color of a display screen of an organic EL display device is disposed, and a color change correction filter for the organic EL display device.

  In recent years, organic EL display devices using organic electroluminescence (EL) elements that emit light themselves have attracted attention as next-generation display devices that replace liquid crystal display devices, and developments such as pursuing high image quality have been rapidly advanced. ing.

  The above-described organic EL display device does not require a backlight necessary for a liquid crystal display device, is optimal for thinning the device, and has advantages such as no limitation in viewing angle.

  In general, the organic EL display device is formed by sequentially laminating a hole transport layer and a hole injection layer on one side of a light emitting layer, and sequentially laminating an electron transport layer and an electron injection layer on the other side. And an electron injection layer that extracts electrons from the cathode, and an electron transport layer that transports the electrons to the light emitting layer. Furthermore, the light emitter can be composed of a plurality of layers as well as a single layer. As described above, since the organic EL display device is composed of a plurality of layers, there is a problem that light interference easily occurs and the wavelength distribution changes depending on the observation direction.

  Not only the organic EL display device described above, it is pointed out that the hue of the display device having a display screen composed of a plurality of layers varies depending on whether the image is observed from the normal direction or from an oblique direction. ing. FIG. 12A shows an observation of the spectral distribution of an organic EL display device displaying white when tilted every 10 ° within a range of 0 ° to 80 ° from the normal direction of the screen of the organic EL display device. Results are shown. FIG. 12B is a graph showing the maximum peak intensity in each spectrum distribution as 1 for the spectrum distribution for each angle displayed in FIG. As can be seen from this figure, when the direction of looking into the screen of the organic EL display device is slanted from the front of the screen, the waveform of the spectrum increases as the tilt angle from the front direction, that is, the normal direction of the screen increases. It turns out that it has shifted to the short wavelength side.

  In order to improve the dependency of the viewing direction in the display device as described above, Patent Document 1 discloses a color filter having a maximum value of optical density in at least one of a range of 475 nm to 525 nm and a range of 550 nm to 620 nm. A display device is disclosed.

JP 2010-171007 A

  The color filter is characterized in that it is not particularly limited as long as it is a color material used for a color filter having an absorption maximum in a wavelength region of 540 nm to 600 nm. However, in the above-described color filter, the coloring patterns of the hues of R, G, and B are arranged corresponding to the emission colors of R, G, and B of the organic EL light emitting element. For this reason, the color filter disclosed in Patent Document 1 needs to be aligned very accurately with respect to the pixel arrangement of the display device, and it is extremely difficult to retrofit or replace the product after shipment.

  An object of the present invention is to provide an organic EL display device that achieves both the improvement effect of the viewing angle dependency of the display color of the organic EL display device and the improvement of the front luminance.

  Another object of the present invention is to provide a color correction filter that does not require alignment with respect to the pixels of the display device and can be easily attached to and replaced with an organic EL display device after factory shipment. It is.

  In order to solve the above problems, the organic EL display device according to the present invention corresponds to the maximum value of the emission intensity in the emission spectrum distribution showing the distribution of the emission intensity of light emitted in the normal direction of the display screen. The display screen is provided with a filter layer having a minimum value of transmittance in a wavelength region shorter than the wavelength of light and having a light emission intensity exceeding zero.

  The organic EL display device according to the present invention is characterized in that, in the above-described configuration, a filter layer having a minimum point of transmittance in a wavelength range of 400 nm to 440 nm is provided on a display screen.

  Moreover, what has the minimum point of the transmittance | permeability in the wavelength range of 480 nm-520 nm can be used for the organic EL display device according to the present invention.

  Moreover, the organic EL display device according to the present invention can use a filter layer having a minimum transmittance in the wavelength range of 560 nm to 610 nm. That is, the organic EL display device according to the present invention has a minimum transmittance in at least one wavelength range of a wavelength range of 400 nm to 440 nm, a wavelength range of 480 nm to 520 nm, and a wavelength range of 560 nm to 610 nm. A filter layer having the above is provided on the display screen.

  In the organic EL display device according to the present invention, a filter layer made of a single layer film or a multilayer film can be used as the filter layer in the configuration.

  Moreover, the organic EL display device according to the present invention uses, in the above-described configuration, a filter layer formed at regular intervals on the same surface provided to be parallel to the display screen as the filter layer. can do.

  Furthermore, the filter layer of the organic EL display device according to the present invention can be configured using the color change correction filter according to the present invention. That is, the color change correction filter for an organic EL display device according to the present invention has a maximum emission intensity in an emission spectrum distribution showing a distribution of emission intensity of light emitted in the normal direction of the display screen of the display device. A filter layer having a minimum value of transmittance in a wavelength region shorter than the wavelength of light corresponding to the value and having a light emission intensity exceeding 0 is arranged on the substrate.

  In the color change correction filter for an organic EL display device according to the present invention, the filter layer having the minimum transmittance in the wavelength range of 400 nm to 440 nm is disposed on the substrate. It is said.

  In addition, the color change correction filter for an organic EL display device according to the present invention can use a filter layer having a minimum transmittance in the wavelength range of 480 nm to 520 nm.

  In addition, the color change correction filter for an organic EL display device according to the present invention can use a filter layer having a minimum transmittance in the wavelength range of 560 nm to 610 nm. That is, the color change correction filter of the organic EL display device according to the present invention according to the present invention has a wavelength range of 400 nm to 440 nm, a wavelength range of 480 nm to 520 nm, and a wavelength range of 560 nm to 610 nm. A filter layer having a minimum point of transmittance is arranged on the substrate.

  In addition, the color change correction filter for an organic EL display device according to the present invention is configured such that, in the above configuration, the filter layer is formed of a single layer film or a multilayer film formed on the substrate. Can do.

  Moreover, the color change correction filter for an organic EL display device according to the present invention can be configured such that, in the above configuration, the filter layer is disposed on the substrate at regular intervals.

  Thus, the organic EL display device according to the present invention can improve the viewing angle dependency of the display color.

1 is a schematic cross-sectional view of an organic EL display device 100 according to Embodiment 1 of the present invention. It is a schematic sectional drawing of the organic electroluminescent display apparatus 100 which concerns on Embodiment 2 of this invention. It is a top view of the color change correction filter 10 which comprises the organic EL display apparatus 100 which concerns on Embodiment 3 of this invention. It is a top view of the color change correction film 10 which comprises the organic EL display apparatus 100 which concerns on Embodiment 4 of this invention. 4A is an example in which the color change correction filter 10 shown in FIG. 4 is pasted on the display screen 20 of the organic EL display device 100 according to Embodiment 4, and FIG. It is another example affixed on an apparatus. It is a top view of the color change correction filter 10 which concerns on Embodiment 5 of this invention. It is a top view of the color change correction filter 10 which concerns on Embodiment 6 of this invention. It is the top view to which a part of display screen of the organic electroluminescence display concerning Embodiment 1 thru / or 6 of the present invention was expanded. It is a graph which shows the transmission spectrum of the material which comprises the filter layer used for the organic electroluminescent display which concerns on this invention, and a color change correction filter. It is the schematic of the measurement of the spectrum distribution by the viewing angle of a display screen, and arrangement | positioning of the spectroradiometer 30 used for the said investigation. (A) is an emission spectrum of an organic EL display device obtained as a result of the measurement shown in FIG. 10 before the embodiment of the present invention is applied, and (b) is an embodiment of the present invention. 2 is an emission spectrum of the display device. (A) is a graph which shows the dependence of the observation direction of the spectral distribution of the light when an organic EL display device is displayed in white, and (b) is the spectral distribution for each angle displayed in (a). It is a graph showing the maximum peak intensity in the spectrum distribution as 1. (A) is a graph which shows the dependence of the observation direction of the spectral distribution of the light at the time of displaying organic EL display device in red, (b) is the light at the time of displaying organic EL display device in green. It is a graph which shows the dependence of the observation direction of a spectrum distribution, (c) is a graph which shows the dependence of the observation direction of the spectrum distribution of the light at the time of making an organic EL display device display blue. It is a schematic sectional drawing of the organic electroluminescent display apparatus 100 which concerns on Example 2 of this invention.

  In FIGS. 13 (a) to (c), the inventors of the present invention have a direction in which the screen of the organic EL display device is looked into the front of the screen, that is, as the inclination angle from the normal direction of the screen increases. It was found that the spectrum waveform was shifted to the short wavelength side.

  In addition, as is apparent from the comparison of FIG. 12B and FIGS. 13A to 13C, the present inventors observe the spectral distribution of light when the organic EL display device displays white. The direction dependency is the same as the superposition of the observation direction dependency of the spectral distribution of the light observed when red (R) display, green (G) display, and blue (B) display are performed. I found out that

  Hereinafter, embodiments according to an organic EL display device in which a color change correction filter and the color change correction filter are arranged will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a schematic cross-sectional view of an organic EL display device 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the display device 100 of the first embodiment is a top emission type, and the drive panel 200 of the organic EL display device 100 is placed on a drive substrate 110 provided on a transparent substrate 120. The first electrode 211 is formed, the organic layer 213 including the hole transport layer, the light emitting layer, and / or the electron transport layer, and the second electrode 212 are sequentially formed to form the organic light emitting elements 21R, 21B, and 21G. Manufactured by. Then, the display apparatus 100 is manufactured by bonding the drive panel 200 and the sealing panel 130 together. The display device 100 according to the first embodiment is configured with the surface side of the sealing panel 130 provided with the color change correction filter layer 11 facing the drive substrate 110 and the organic light emitting elements 21R, 21B, and 21G. . In the first embodiment, the surface side of the sealing panel 130 on which the color change correction filter 11 is not provided is the display screen 20, and the light LT is emitted outward.

The color change correction filter layer 11 has a wavelength shorter than the wavelength of light corresponding to the maximum value of the emission intensity in the emission spectrum distribution showing the distribution of the emission intensity of light emitted in the normal direction of the display screen. And has a minimum transmittance in a wavelength region where the emission intensity exceeds zero.

  The viewing angle dependency of the display color is as described below. The inclination angle from the normal direction of the display screen is large in a region of a wavelength shorter than the wavelength of the light when the emission intensity of light emitted in the normal direction of the display screen of the organic electroluminescence display device has a maximum value. Accordingly, the wavelength shifts to the short wavelength side when the emission intensity is the same. That is, the emission intensity increases at the same wavelength. When the emission intensity increases in this way, there is a difference from the emission intensity of light emitted in the normal direction of the display screen (hereinafter sometimes referred to as “difference in emission intensity”). The difference is recognized by humans as the viewing angle dependency of the display color.

  When the filter layer 11 is used, the emission intensity of the light emitted in the normal direction of the display screen and the light emitted at an angle inclined from the normal direction of the display screen is uniform according to the absorbance of the filter layer 11. Therefore, the difference in emission intensity is reduced. As described above, the filter layer can improve the viewing angle dependency of the display color. The above “can be reduced at a uniform rate” is, for example, emitted at an angle inclined from the normal direction of the display screen, where the emission intensity of light emitted in the normal direction of the display screen is 100. When the light emission intensity is 1000, the light emission intensity emitted in the normal direction of the display screen is 50 (minus 50%) through the filter layer 11 and is inclined from the normal direction of the display screen. This means that the emission intensity of light emitted at an angle can be 500 (minus 50%), and as a result, the difference in emission intensity can be 900 to 450.

  Specifically, the color change correction filter layer 11 has a minimum point of transmittance in the wavelength range of 480 nm to 520 nm. For example, the filter layer 11 used in the present embodiment can be made of a material having a minimum point of transmittance within the wavelength range R1 shown in FIG.

  As a more specific example, the sealing panel facing the organic light emitting elements 21R, 21B, and 21G using a material having a minimum transmittance in a wavelength range of 480 nm to 520 nm as shown in FIG. A single film is formed directly on the surface of 130. The material constituting the filter layer 11 is not particularly limited as long as it has a minimum transmittance in the wavelength range of 480 nm to 520 nm as described above. Specifically, a squarylium dye, an azomethine dye, a cyanine dye, Examples include oxonol dyes, azo dyes, arylidene dyes, xanthene dyes, and merocyanine dyes.

  Since the wavelength range R1 is set in the wavelength region of green-based visible light, the organic EL display device 100 of the present embodiment has improved viewing angle dependency in the wavelength region of green-based visible light. As in this embodiment, the color change correction filter layer constituting the organic EL display device of the present invention can be configured using only a material having a minimum transmittance within the wavelength range R1, but other colors such as red can be used. It is possible to use a material having a minimum point of transmittance in the wavelength range of visible light of the color tone.

  For example, for the purpose of improving the viewing angle dependency in the wavelength region of red-based visible light, the color change correction filter layer uses a material having a minimum transmittance in the wavelength range of 560 nm to 610 nm. Can be configured.

  As described above, the color change correction filter layer that improves the viewing angle dependency in the wavelength region of red visible light is made of a material having a minimum point of transmittance within the wavelength range R2 shown in FIG. can do. Examples of such materials include azo dyes, anthraquinone dyes, triphenylmethane dyes, squarylium dyes, azomethine dyes, cyanine dyes, oxonol dyes, arylidene dyes, xanthene dyes, phthalocyanine dyes, pyromethene dyes, and merocyanine dyes. .

  Alternatively, for the purpose of improving the viewing angle dependence in the wavelength region of blue-based visible light, the color change correction filter layer is made of a material having a minimum transmittance in the wavelength range of 400 nm to 440 nm. It may be configured.

  As described above, the color change correction filter layer that improves the viewing angle dependency in the blue visible light wavelength region is made of a material having a minimum transmittance in the wavelength range R3 shown in FIG. 13C. can do. Examples of such materials include pyrene, perylene, triphenylene), xanthenes (for example, fluorescein, eosin, erythrosine, rhodamine B, rose bengal), cyanines (for example, thiacarbocyanine, oxacarbocyanine), merocyanines (for example, , Merocyanine, carbomerocyanine), thiazines (eg, thionine, methylene blue, toluidine blue), acridines (eg, acridine orange, chloroflavin, acriflavine), anthraquinones (eg, anthraquinone), squalium (eg, squalium) Etc.

  As described above, the color change correction filter layer constituting the organic EL display device of the present invention includes a material having a minimum transmittance in the wavelength regions R1 to R3 shown in FIGS. It is configured using at least one kind. When improving the viewing angle dependency for three types of visible light of red, green, and blue, a material having a minimum point of transmittance is mixed in each of the wavelength regions R1 to R3, and the color change A single-layer solid film is directly formed on the surface of the sealing panel 130 as a correction filter layer. Alternatively, the color change correction filter layer can be composed of a plurality of layers by sequentially stacking filter layers made of materials having a minimum transmittance in each of the wavelength regions R1 to R3.

  The thickness of the filter layer 11 is preferably in the range of 0.1 μm to 100 μm. When the thickness of the filter layer 11 is less than 0.1 μm, the effect of correcting the color change due to the viewing angle on the display screen of the display device cannot be sufficiently obtained, while the thickness of the filter layer is 1000 μm. This is because if it is super, the light of the sub-pixel is absorbed and the screen may become dark.

  The filter layer 11 is formed on the surface of the base film as described above using an appropriate method such as coating by a roller, spin coating, film laminating method, spray coating, sputtering, vapor deposition, ion plating, coating method, or the like. Can be formed.

[Second Embodiment]

  An organic EL display device 100 according to the second embodiment is a bottom emission type organic EL display device, and as shown in FIG. 2, the filter layer 11 for improving the viewing angle dependency is an organic EL display. It is characterized by being arranged at regular intervals on the surface of the transparent substrate 120 of the display screen of the apparatus.

  In the display device 100 according to the second embodiment, the transparent substrate 120 serves as a sealing panel, and the filter layer 11 is formed outside the display device 100. In this embodiment, the display screen 20 in which the filter layer 11 is formed in advance is used. After the drive panel and the sealing panel are bonded together, the filter layer 11 is placed on the display screen 20. You may form in. In the display device 100 according to the second embodiment, the light LT is emitted outward from the surface of the transparent substrate 120 on which the filter layer 11 is not formed.

  By patterning the filter layer 11 as described above, it is possible to improve the viewing angle dependency of the display color of the display device 100 and to improve the front luminance as compared to a solid film that is not patterned. .

  The pattern shape of the filter layer 11 may be various planar shapes such as a lattice shape, a substantially circular shape, a substantially elliptical shape, and a substantially polygonal shape in addition to the stripe shape shown in FIG. In addition, the planar size of the repetitive shape constituting the pattern shape of the filter layer 11, that is, the planar size of the filter layer 11, is such that the interval (pitch dimension) between adjacent filter layers 11 is in the range of 1 μm to 100 μm. It is preferable to set so as to be within. The stripe pattern exhibits a greater effect of the filter layer vertically and horizontally. On the other hand, the effect of the filter layer is evenly exhibited in both the upper and lower sides and the left and right sides of the lattice shape and the substantially circular pattern.

  Further, the size and arrangement of the filter layer 11 are determined so as to match the subpixel size and arrangement relationship of the display screen to which the present invention is applied. FIG. 8 is an enlarged view of a part of the display screen 20 of the organic light emitting diode (OLED) color display device in which the pixels 21 are arranged. Each pixel 21 includes red, green, and blue light emitting sub-pixels 21R, 21G, and 21B as known in the prior art. For convenience, the size of the light emitting subpixels 21R, 21G, and 21B is represented by “length L × width W”.

[Third Embodiment]
FIG. 3 is a schematic plan view of an organic EL display device 100 according to Embodiment 3 of the present invention. The display device 100 according to the present embodiment is characterized in that a color change correction filter 10 including a transparent substrate and a single-layer filter layer 11 formed on the substrate is pasted on the display screen 20.

  The transparent substrate is not particularly limited as long as it is a material having optical transparency, that is, a function of transmitting visible light. Examples of such a substrate include a plastic substrate made of an organic material such as polyimide, polycarbonate, and polyethylene terephthalate (PET), and a substrate made of an inorganic material such as glass, quartz, or a silicon substrate.

  In addition to the substrate, an optically transparent resin film such as a polyimide resin, an acrylic resin film, or a fluororesin film can be used as the transparent substrate, and an indium tin oxide film or a glass thin film can be used as the inorganic film. An optically transparent inorganic film such as can be used.

  The thickness of the substrate is not particularly limited, but it is preferable to use a transparent substrate formed with a substantially uniform layer thickness of 5 μm to 20000 μm. In addition, the substrate is formed to have a substantially uniform layer thickness within the above thickness range, and has a plurality of layers even if it is composed of a single layer as long as it has optical transparency. It may consist of.

  The base is transparent when dispersed in a resin, such as ceramic particles such as silica, alumina, zirconia, and titanium dioxide, or inorganic particles of metal oxides such as indium oxide, acrylic polymers, You may comprise using the appropriate resin film in which organic particles, such as transparent plastics, such as a carbonate type polymer, a styrene type polymer, and a vinyl chloride type polymer, were disperse | distributed.

  As shown in FIG. 1, the organic EL display device 100 according to the present embodiment has the color change correction filter 10 attached on the sealing panel 130 so that the filter layer 11 faces the organic light emitting elements 21R, 21B, and 21G. Then, it can be manufactured by bonding the drive panel 200 and the sealing panel 130 together.

  Or the color change correction filter 10 in this embodiment can be stuck on the transparent substrate 120 as a sealing panel with the filter layer 11 facing outside, as shown in FIG.

  In addition, the color change correction filter 10 in the present embodiment is not only directly attached on the surface of the sealing panel 130 or the transparent substrate 120, but also in a state where other functional layers such as other antireflection layers are interposed. , And can be attached on the sealing panel 130 or the transparent substrate 120.

[Fourth Embodiment]
FIG. 4 is a schematic plan view of the color change correction filter 10 attached to the organic EL display device 100 according to Embodiment 4 of the present invention. In the color change correction filter 10, the filter layer 11 having the minimum transmittance in the wavelength range of 470 nm to 520 nm has a display screen of the display device 100 as shown in FIGS. 4, 5 (a) and 5 (b). It is characterized by being arranged at regular intervals on the surface.

  By patterning the filter layer 11 as described above, the viewing angle dependency of the display color of the display device 100 is improved, and the front luminance is increased as compared with a non-patterned uniform film such as a solid film. It becomes possible to improve.

  In addition to the stripe shape shown in FIG. 4, the pattern shape of the filter layer 11 can be various planar shapes such as a lattice shape as in the second embodiment. However, in consideration of both the improvement effect of the viewing angle dependency of the display color of the display device 100 and the improvement of the front luminance, the planar size of the repetitive shape constituting the pattern shape of the filter layer 11, that is, The planar size of the filter layer 11 is preferably set so that the interval (pitch dimension) between adjacent filter layers 11 is in the range of 1 μm to 100 μm.

  The color change correction filter 10 is pasted so as to completely cover the surface of the display screen 20. In FIG. 5A, the color change correction filter 10 has the display screen 20 so that the length direction of the filter layer 11 is substantially parallel to the direction of the length L of the subpixels 21R, 21G, and 21B. It is pasted on the surface.

  In addition to the attaching direction shown in FIG. 5A, the color change correction filter 10 may be attached on the surface of the display screen 20 so that the sub-pixel intersects the filter layer 11. . That is, the color change correction filter 10 is placed on the surface of the display screen 20 so that an angle α formed between the length direction of the sub-pixel and the length direction of the filter layer 11 is 0 ° to 180 °. It may be pasted. For example, FIG. 5B shows that the color change correction filter 10 is such that the length direction of the filter layer 11 forms an angle α = 90 ° with respect to the length direction of the sub-pixels of the pixel 20. The state where it is affixed on the surface of the display screen 20 is shown.

[Fifth Embodiment]
FIG. 6 is a plan view of a color change correction filter 10 according to the fifth embodiment in which substantially circular filter layers 11 are formed at predetermined intervals.

  As described above, the color change correction filter 10 according to the fifth embodiment is also set so that the distance (pitch dimension) between adjacent filter layers 11 is 1 μm to 100 μm in diameter. It is preferable to shape the display screen to a size suitable for the display screen to which the present invention is applied.

  The color change correction filter 10 according to the fifth embodiment can be created based on the same manufacturing method and manufacturing conditions as those of the first embodiment except for the shape of the filter layer 11.

[Sixth Embodiment]

FIG. 7 is a plan view of the color change correction filter 10 according to the fourth embodiment, and the pattern of the filter layer 11 of the color change correction filter 10 is a lattice pattern, and the filter layer 11 _L and the filter layer 11 are shown in FIG. _T is formed vertically and horizontally.

As described above, the filter layer 11 _{L in} the vertical direction and the filter layer 11 _{T in the} horizontal direction of the filter pattern 3 each have an interval (pitch dimension) between adjacent filter layers 11 having a diameter of 1 μm to 1 μm. It is preferable to set it within the range of 100 μm.

The filter pattern 3 according to the sixth embodiment can be created based on the same manufacturing method and manufacturing conditions as those of the first embodiment except for the shapes of the filter layers 11 _L and 11 _T.

  In addition to the first to sixth embodiments, if the filter layer constituting the filter pattern of the present invention is formed so that the interval between adjacent filter layers is within the predetermined range (1 μm to 100 μm), Various planar shapes such as a stripe shape, a lattice shape, a substantially circular shape, a substantially elliptical shape, and a substantially polygonal shape can be used. When the filter layer has a repetitive pattern based on the above conditions, the organic EL display device according to the present invention can simultaneously improve the viewing angle dependency of the display color and the front luminance.

  The organic electroluminescence display device and the color change correction filter of the present invention may be provided with an antireflection layer such as titanium oxide, zirconia oxide, or indium tin oxide. For example, in the case of the organic electroluminescence display device according to Embodiment 1 of the present invention, the antireflection layer can be formed as the uppermost layer on one surface side of the sealing panel 130, and the antireflection layer and the sealing layer can be sealed. The color change correction filter layer 11 can be interposed between the stop panel 130.

  In the case of the organic electroluminescence display device according to Embodiments 3 to 6 of the present invention, the color change correction filter 10 having a layer structure in which an antireflection layer is stacked is used as the uppermost layer on the color change correction filter layer 11. be able to. The antireflection layer is generally formed by an appropriate method such as sputtering, vapor deposition, ion plating, or coating.

  The color change correction filter for an organic EL display device according to the present invention does not require alignment and does not require high alignment accuracy. That is, the color change correction filter of the present invention does not need to be arranged corresponding to the R, G, and B emission colors of the organic EL light emitting element. Therefore, the color correction pattern of the present invention can be easily formed on the display screen of the display device.

  Moreover, the color change correction filter for an organic EL display device according to the present invention can be easily applied to an existing display device such as a touch panel member, and can be easily replaced.

  Further, the organic electroluminescence display device and the color change correction filter of the present invention have a nano-order fine uneven pattern, that is, a moth-eye structure on the outermost surface thereof, thereby preventing reflection on the organic EL display device of the present invention. Functions can be added. For example, in the case of the organic electroluminescence display device according to the first embodiment of the present invention, the moth-eye structure can be formed on the uppermost surface of any one surface side of the sealing panel 130, and the color change correction filter layer 11 can be formed. The moth-eye structure may be formed on the outermost surface.

  In the organic electroluminescence display device according to Embodiments 3 to 6 of the present invention, a moth-eye structure can be formed on the outermost surface on the color change correction filter layer 11. For example, in the case of a single-layer filter layer 11 as shown in Embodiment 3 of the present invention, a moth-eye structure may be formed on the outermost surface of the filter layer. Further, when the filter layer 11 has a certain pattern shape as in the fourth to seventh embodiments, the outermost surface of both the filter layer 11 and the exposed portion of the substrate such as a base film on which the filter layer 11 is not formed. A moth-eye structure may be formed on the top.

  In the first to sixth embodiments, the portion denoted by reference numeral 12 is a portion where the filter layer 11 of the present invention is not formed, that is, a portion where the substrate such as the display screen or the base film is exposed. Show.

[Example 1]

  An organic EL display device 100 having the same structure as that of the first embodiment was manufactured. The color change correction filter layer 11 in this embodiment is a layer made of a single film containing an azomethine dye and having a thickness of about 1.5 μm, and has a minimum transmittance in a wavelength range of about 500 nm. Have

The organic EL display device 100 according to this embodiment is a top emission type OLED color display device, and the color change correction filter layer 11 faces the drive substrate 110 and the organic light emitting elements 21R, 21B, and 21G. It is formed on the surface of the sealing panel 130.
[Correction effect test of color change by viewing angle]

  Next, the display screen 20 of the display device is displayed in white, and the spectral distribution of light emitted from the display screen 20 in each case before and after the color change correction filter layer 11 in this embodiment is formed, and The color temperature was measured from an oblique direction using a spectroradiometer 30 as shown in FIG. That is, the spectroradiometer 30 is disposed in a direction inclined by an angle θ (0 ° ≦ θ ≦ 80 °) from the vertical direction of the display screen 20. And the angle (theta) was increased every 10 degrees from the perpendicular direction of the said display screen 20, and the spectrum distribution and color temperature of white light were measured. The measurement results are shown in Tables 1 and 2 and FIGS. 11 (a) and 11 (b), respectively.

  Table 1 shows the measurement result of the color temperature of the light emitted from the display screen 20 before the color change correction filter layer 11 in this embodiment is formed. FIG. 11 (a) shows the observed spectral distribution, which is almost the same as FIG. 12 (a).

  Table 2 shows the measurement result of the color temperature of the light emitted from the display screen 20 on which the color change correction filter layer 11 is formed in this embodiment. FIG. It is an observed spectral distribution. As can be seen by comparing FIG. 11B and FIG. 12A, the color change due to the viewing angle to the display screen 20 is performed in the wavelength range of 480 nm to 520 nm by the color change correction filter layer 11 in this embodiment. Was found to be suppressed.

  Further, comparing Table 1 and Table 2, the display screen 20 in which the color change correction filter layer 11 in this example is not formed has a color temperature in the vicinity of a viewing angle of 60 ° to 70 ° with a color temperature at a viewing angle of 0 °. The color temperature at a viewing angle of 80 ° is smaller than the color temperature at a viewing angle of 0 °. This indicates that the display screen 20 in which the color change correction filter layer 11 is not formed in this embodiment has a large screen flicker when viewed from the display screen 20 in the horizontal direction.

  On the other hand, the display screen 20 on which the color change correction filter layer 11 in this embodiment is formed, that is, the organic EL display device 100 according to this embodiment has a color temperature at a viewing angle of 0 ° and a viewing angle of 70 °. The difference in color temperature is about 1340 degrees. This value is extremely small compared to the difference in color temperature of the display screen 20 in which the color change correction filter layer 11 is not formed in this embodiment. Further, regarding the difference between the color temperature at the viewing angle of 70 ° and the color temperature at the viewing angle of 80 °, the value calculated from Table 2 is clearly reduced from the value calculated from Table 1. From this result, it was clarified that the organic EL display device 100 according to this example has a function of reducing screen flicker due to the viewing angle on the display screen 20.

[Example 2]
FIG. 14 is a schematic cross-sectional view of an organic EL display device 100 according to Example 2 of the present invention. As shown in FIG. 14, the display device 100 of the second embodiment is a top emission type OLED color display device. In this embodiment, the color change correction filter layer 11 is a layer in which dots made of an azomethine dye and having a thickness of about 1.5 μm and a diameter of about 20 μm are uniformly formed on the surface of the sealing panel 130. 110 and the organic light emitting elements 21R, 21B, and 21G are formed on the sealing panel 130 so as to face each other.

  The surface area on the panel 130 occupied by the dot-shaped portion made of the dye constituting the color change correction filter layer 11 in this embodiment is the surface of the panel 130 surrounded by the outer periphery of the color change correction filter layer 11. 70% of the area.

[Correction effect test of color change by viewing angle]
The brightness and color temperature of light radiated from the display screen 20 are measured in front (θ = 0 °) and obliquely (θ = 70) using the spectroradiometer 30 as shown in FIG. °) direction.

  Table 3 shows the results of the measurement performed using Example 2, and Table 4 shows the front (θ = 0 °) and diagonal (θ = 70 °) of Example 1 derived from Tables 1 and 2. The brightness (Y value) and color temperature of light from the direction.

  Comparing the light luminance (Y value) in Table 3 and Table 4, the light luminance of the organic EL display device 100 according to Example 2 is either front (θ = 0 °) or oblique (θ = 70 °). It can be seen that there is also an improvement in the direction of. Further, according to Table 3, the organic EL display device 100 according to Example 2 shows the difference between the color temperature at the viewing angle of 0 ° and the color temperature at the viewing angle of 70 ° is about 1030 degrees, and is shown in Table 1. It can be seen that the difference in color temperature of the conventional organic EL display device is extremely small.

  Thus, it was shown that patterning the filter layer 11 improves the viewing angle dependency of the display color of the display device 100, and improves the front luminance as compared to a solid film that is not patterned. .

  Since each of the organic EL display devices 100 according to Examples 1 and 2 has the filter layer having the minimum transmittance in the wavelength range of 480 nm to 520 nm, the effect of suppressing the color change in the wavelength range of 480 nm to 520 nm. Is remarkably demonstrated.

  In addition, by configuring the filter layer so as to have a transmittance minimum point in the wavelength range of 400 nm to 440 nm and in the wavelength range of 480 nm to 520 nm, in the range of the wavelength range of 400 nm to 440 nm and the wavelength range of 480 nm to 520 nm The viewing angle dependence of the display color can be improved at least as much as 1 and 2.

1-3 Filter pattern 10 Color change correction filter 10
DESCRIPTION OF SYMBOLS 11 Filter layer 12 Base film 20 Display screen 21 Pixel 21B Sub pixel 21R Sub pixel 21G Sub pixel 110 Driving substrate 120 Transparent substrate 130 Sealing panel 200 Driving panel

Claims (6)

  In the emission spectrum distribution showing the emission intensity distribution of the light emitted in the normal direction of the display screen, the emission intensity is more than 0 in a wavelength region shorter than the wavelength of the light corresponding to the maximum value of the emission intensity. An organic electroluminescence display device, wherein a filter layer having a minimum transmittance in a wavelength region is provided on the display screen.   A filter layer having a minimum point of transmittance in at least one of a wavelength range of 400 nm to 440 nm, a wavelength range of 480 nm to 520 nm, and a wavelength range of 560 nm to 610 nm is provided on the display screen. The organic electroluminescence display device according to claim 1, wherein   The organic electroluminescence display device according to claim 1, wherein the filter layers are arranged at regular intervals.   In the emission spectrum distribution showing the emission intensity distribution of the light emitted in the normal direction of the display screen, the emission intensity is more than 0 in a wavelength region shorter than the wavelength of the light corresponding to the maximum value of the emission intensity. A color change correction filter for an organic EL display device, wherein a filter layer having a minimum value of transmittance in a wavelength region is disposed on a substrate.   A filter layer having a minimum point of transmittance in at least one of a wavelength range of 400 nm to 440 nm, a wavelength range of 480 nm to 520 nm, and a wavelength range of 560 nm to 610 nm is disposed on the substrate. The color change correction filter for an organic EL display device according to claim 4. 6. The color change correction filter for an organic EL display device according to claim 4, wherein the filter layer is disposed on the substrate at regular intervals.