JP2010243769A - Circularly polarizing plate and organic el display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circularly polarizing plate reducing external light reflection without deteriorating use efficiency of EL emission, and to provide an organic EL display device using the circularly polarizing plate. <P>SOLUTION: The circularly polarizing plate includes: a first substrate; a wire grid polarizer formed on the first substrate and having a large number of periodic linear metal wires; and a liquid crystal immobilized layer formed on the wire grid polarizer and having optical anisotropy. An organic EL display substrate includes a second substrate, a reflecting electrode formed on the second substrate, an organic layer including a light-emitting layer formed on the reflecting electrode, and an optically transparent electrode formed on the organic layer. In the organic EL display device, the circularly polarizing plate and the organic EL display substrate are fixed by an adhesive layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a circularly polarizing plate and an organic EL display device, and more particularly to a circularly polarizing plate capable of suppressing reflection of external light without impairing the use efficiency of EL light emission and an organic EL display device using the circularly polarizing plate.

  The organic EL display device is expected to be applied to a display in recent years because of its features such as space saving and light weight due to its thinness and high luminance emission even at an applied voltage of about 10V.

  The organic EL display device has a configuration in which an organic layer capable of emitting light is sandwiched between electrodes. The organic layer is basically a laminate of a hole transport layer, a light emitting layer, and an electron transport layer. As the electrode, a transparent electrode such as ITO (Indium-Tin-Oxide) is used on the light extraction side, and a reflective metal electrode such as aluminum is used on the opposite position. In such a configuration, electrons and holes are injected from both electrodes into the light emitting layer through the electron transport layer and the hole transport layer, and the electrons and holes are recombined in the light emitting layer to emit light.

  However, when the viewer looks at the organic EL display device, the external light is reflected on the reflective metal electrode, so that it is observed as if it is a mirror surface, and the reduction in contrast becomes a problem.

  Therefore, in order to solve such a problem, Patent Document 1 discloses a technique of cutting external light reflection using a circularly polarizing plate as a light extraction surface (see Patent Document 1).

  Conventionally, such a circularly polarizing plate has a retardation film composed of a polymer stretched film on a polarizing film stretched by adsorbing iodine or a dichroic dye on a hydrophilic polymer film such as a polyvinyl alcohol (PVA) film. It has a structure in which films are laminated. Here, when a circularly polarizing plate is used on the light extraction surface side of the organic EL display device, the outside light becomes linearly polarized light by the polarizing film, and then the retardation film is controlled to a quarter of the wavelength of light. By passing through, it becomes circularly polarized light. When this is reflected by the metal electrode, the circularly polarized state is reversed, and when it passes through the retardation film again, it becomes linearly polarized light inclined by 90 ° from the incident time, reaches the polarizing film and is absorbed.

  However, since the EL film is also absorbed by the polarizing film in the circularly polarizing plate, the luminance is approximately halved. If the luminance is halved, the luminance required for a desired value is approximately doubled, which has a great adverse effect on the element life, which is a major issue for the realization of organic EL devices.

JP 2004-226842 A

  An object of this invention is to provide the circularly-polarizing plate which can suppress external light reflection, without impairing the utilization efficiency of EL light emission, and an organic electroluminescent display apparatus using the same.

  According to the first aspect of the present invention, there is provided a substrate, a wire grid polarizer having a number of periodic linear metal wires formed on one side of the substrate, and an optical structure formed on the wire grid polarizer. And a liquid crystal immobilization layer having a directionality.

  The invention according to claim 2 of the present invention is the circularly polarizing plate according to claim 1, wherein the period of the metal wire is 240 nm or less.

  The invention according to claim 3 of the present invention is the circularly polarizing plate according to claim 1 or 2, further comprising an antireflection layer on the substrate side of the metal wire.

  The invention according to claim 4 of the present invention is characterized in that the liquid crystal immobilization layer is a λ / 4 plate such that light that has passed through the wire grid polarizer and becomes linearly polarized light becomes circularly polarized light. It is a circularly-polarizing plate in any one of claim | item 1 thru | or 3.

  The invention according to claim 5 of the present invention is the circularly polarizing plate according to any one of claims 1 to 4, wherein the substrate is a color filter substrate.

  According to a sixth aspect of the present invention, there is provided a wire grid polarizer having a first substrate, a plurality of periodic linear metal wires formed on the first substrate, and the wire grid polarizer. A circularly polarizing plate provided with a liquid crystal fixing layer having optical anisotropy formed, a second substrate, a reflective electrode formed on the second substrate, and a light emitting layer formed on the reflective electrode An organic EL display substrate comprising an organic layer containing a light transmitting electrode formed on the organic layer, and a circularly polarizing plate and the organic EL display substrate are fixed by an adhesive layer. It is an organic EL display device.

  The invention according to claim 7 of the present invention is the organic EL display device according to claim 6, wherein the organic EL display substrate extracts light from a light-transmissive electrode.

  According to an eighth aspect of the present invention, in the organic EL display device, the distance between the reflective electrode of the organic EL display substrate and the reflective surface of the wire grid polarizer of the circularly polarizing plate is 1 μm or more and 30 μm or less. An organic EL display device according to claim 6 or 8.

  ADVANTAGE OF THE INVENTION According to this invention, the circularly-polarizing plate which can suppress external light reflection, without impairing the utilization efficiency of EL light emission, and an organic electroluminescence display using the same can be provided.

(A) And (b) is a schematic sectional drawing which shows an example of the organic electroluminescence display which concerns on embodiment of this invention. It is a schematic sectional drawing which shows the wire grid polarizer which concerns on embodiment of this invention. (A) And (b) is the schematic which shows the adhesion | attachment method of the board | substrate which concerns on embodiment of this invention. It is a schematic sectional drawing which shows the external light which injects into the organic electroluminescence display which concerns on embodiment of this invention. (A)-(i) is the schematic which shows external light reflection which concerns on embodiment of this invention. It is a schematic sectional drawing which shows taking out of EL light emission which concerns on embodiment of this invention. (A)-(f) is schematic which shows taking out of EL light emission which concerns on embodiment of this invention. (A) And (b) is a schematic sectional drawing explaining the mode of observation from the diagonal direction which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1A and 1B are schematic cross-sectional views illustrating an example of an organic EL display device according to an embodiment of the present invention. As shown in FIG. 1A, in the organic EL display device according to the embodiment of the present invention, for example, a circularly polarizing plate 4 and an organic EL display substrate 9 are fixed to face each other with an adhesive layer 5 interposed therebetween. The circularly polarizing plate 4 includes a substrate 1, a metal wire (wire grid polarizer) 2, and a liquid crystal fixing layer 3, and the organic EL display substrate 9 includes a substrate 8, a reflective electrode 7, and an organic EL layer 6. (Red light emitting layer 6R, green light emitting layer 6G, blue light emitting layer 6B).

  Further, as shown in FIG. 1B, a circularly polarizing plate 13 having a color filter function in which a circularly polarizing plate is formed on the color filter 10 may be used. In this case, each color (red light emitting layer 6R, green light emitting layer 6G, blue light emitting layer 6B) of the organic EL layer 6 of the organic EL display substrate 9 and each color of the color filter 10 (red color filter layer 11R, green color filter layer 11G). , And the blue color filter layer 11B) are preferably fixed so as to face each other.

  Next, the member which comprises the circularly-polarizing plate 4 which concerns on embodiment of this invention is demonstrated. The circularly polarizing plate 4 is formed by laminating the liquid crystal fixing layer 3 on the wire grid polarizer 2. By laminating the liquid crystal fixing layer 3 on the wire good polarizer 2, the circularly polarizing plate 4 having the function as the circularly polarizing plate 4 and the function as the reflecting layer can be obtained. Moreover, by using the liquid crystal fixed layer 3 as a retardation layer, the film thickness can be significantly reduced as compared with a retardation film produced by stretching a conventional film.

  In the wire grid polarizer 2 used for the circularly polarizing plate 4 according to the embodiment of the present invention, light in one polarization direction has high transmittance, and light in the other polarization direction has high reflectance.

  Here, FIG. 2 is a schematic sectional view showing the wire grid polarizer 2 according to the embodiment of the present invention. As shown in FIG. 2, for example, the wire grid polarizer 2 is made of a metal such as aluminum, silver, or chromium on the surface of a substrate 1 such as glass, and is made of a linear metal wire that is arranged in parallel at regular intervals. . When randomly polarized (naturally polarized) light is incident, polarized light 14 having an electric field vector oscillating parallel to the metal wire (the polarization direction is treated as the oscillation direction of the electric field vector) is reflected and oscillated orthogonally to the metal wire. The polarized light 15 is transmitted.

  In addition, when the arrangement period of the metal wire is sufficiently small with respect to the wavelength of the incident light, for example, if it is half or less, the polarization property is exhibited. In the case of the wavelength of visible light, the period is preferably 240 nm or less, for example. By setting the period of the metal wires of the wire grid polarizer 2 to 240 nm or less, good optical characteristics can be obtained in a wide band in the visible light region. Since the polarization characteristic is improved as the period becomes smaller, it is particularly preferable that the period is 150 nm or less.

  The height of the metal wire (metal thickness) is determined based on the polarization separation performance of the wire grid polarizer 2, and specifically, the light transmittance may be 1% or less, preferably 30 nm or more. If so, good performance can be obtained. If the metal is too thin, the transmission of light cannot be ignored, and the polarization separation performance is degraded. On the other hand, if the metal is too thick, the light use efficiency is lowered, so the upper limit of the thickness is preferably about 200 nm.

  By having an antireflection layer (not shown) on the substrate side of the metal wire, reflection of external light incident from the substrate side on the metal wire can be prevented. As the antireflection layer, a substance having a low reflectance such as chromium oxide can be used. In addition, a polarizing film having a linearly polarized light transmission direction similar to that of the wire grid polarizer 2 and absorbing linearly polarized light inclined by 90 ° is pasted on the substrate opposite to the side on which the metal wires are formed. Thus, an antireflection layer may be used.

  As a method for producing such a wire grid polarizer 2, vacuum deposition is performed by applying an antireflection film such as chromium oxide on the surface of a substrate 1 such as glass and a metal material such as aluminum, silver, or chromium thereon. A thin film is formed by a technique such as sputtering. The substrate 1 may be a substrate 1 having a color filter function, for example. By using the substrate 1 having a color filter function, external light reflection can be further suppressed, and chromaticity can be adjusted for EL emission. Since the surface of the color filter has irregularities of about several μm, it is possible to form an antireflection film and a metal film after preferably forming a film that flattens such a shape.

  A photosensitive resin (resist) is applied onto a metal material to form a film, and the resist is formed into a stripe pattern with a predetermined pitch. The stripe pattern can be formed by forming a latent image on a resist by a method such as optical drawing (mask exposure, reduced projection exposure, interference exposure, etc.), electron beam drawing, X-ray drawing, and developing. In particular, a light drawing method such as two-beam interference exposure is preferably used as a method for producing a stripe pattern having a large area with high productivity.

  Then, in order to remove the part where the resist is peeled and the metal surface is exposed, the metal and the antireflection film are removed by performing ion beam and various wet etching, and finally the remaining resist is removed, Metal film patterning is completed.

  Next, the liquid crystal fixed layer 3 used for the circularly polarizing plate 4 according to the embodiment of the present invention will be described. The type of alignment of the liquid crystal to be fixed is not particularly limited as long as the phase difference is developed in the in-plane direction. For example, a positive A plate obtained by homogeneous alignment in which the rod-shaped liquid crystal is aligned in the plane, a positive C plate obtained by homogeneous alignment in which the rod-shaped liquid crystal is aligned in the plane, etc. It is not limited to these.

  As a method for forming the liquid crystal immobilization layer 3, various methods can be used. On the wire grid polarizer 2, a liquid crystal exhibiting liquid crystallinity and exhibiting photopolymerization or photocrosslinkability. A method of applying a coating solution containing a compound and curing it by using both exposure and heating is simple.

  In addition to the liquid crystal compound and solvent, this coating solution is a chiral agent, photopolymerization initiator, thermal polymerization initiator, sensitizer, chain transfer agent, polyfunctional monomer or oligomer, resin, surfactant, storage stabilizer, adhesion Components such as an improver can be added as long as liquid crystallinity is not impaired.

  Examples of liquid crystal materials include alkylcyanobiphenyl, alkoxybiphenyl, alkylterphenyl, phenylcyclohexane, biphenylcyclohexane, phenylbicyclohexane, pyrimidine, cyclohexanecarboxylic acid ester, halogenated cyanophenol ester, alkylbenzoic acid ester, alkylcyanotolane, Dialkoxytolane, alkylalkoxytolane, alkylcyclohexyltolane, alkylbicyclohexane, cyclohexylphenylethylene, alkylcyclohexylcyclohexene, alkylbenzaldehyde azine, alkenylbenzaldehyde azine, phenylnaphthalene, phenyltetrahydronaphthalene, phenyldecahydronaphthalene, and derivatives thereof, and The acrylics of these compounds Over door, and the like.

  Next, the coating liquid is applied onto the wire grid polarizer 2. At this time, if necessary, a film having an orientation function is formed on the surface of the wire grid polarizer 2. For coating, spin coating, slit coating, letterpress printing, and other known coating methods can be applied.

  Subsequently, after the formed coating liquid is dried to form a thin film containing a liquid crystal compound, exposure and heating are performed. Thereby, the components in the thin film are polymerized or cross-linked, so that the liquid crystal compound is fixed while maintaining the alignment state.

  The liquid crystal immobilization layer 3 formed as described above is preferably a λ / 4 plate in a wide wavelength range in the visible light region (400 nm to 800 nm). As a method for obtaining such a broadband λ / 4 plate, for example, a liquid crystal fixing layer 3 that functions as a quarter wavelength plate for light having a wavelength of 550 nm and a liquid crystal fixing layer 3 that exhibits other retardation characteristics, For example, it can be obtained by a method of superimposing a retardation layer functioning as a half-wave plate. Therefore, the liquid crystal immobilization layer 3 may be composed of one layer or two or more layers.

  When the substrate 1 is a color filter, the phase difference of the liquid crystal immobilization layer 3 can be controlled for each region so as to be 1/4 of the wavelength of each display color. Specifically, it is preferably about 138 nm in the green wavelength region (center wavelength around 550 nm), preferably about 113 nm in the blue wavelength region (around 450 nm central wavelength), and the red wavelength region (center wavelength). (About 630 nm) is preferably about 158 nm. In addition, for controlling the retardation for each region, for example, the exposure amount to the thin film containing the liquid crystal compound is changed for each region, and the liquid crystal compound is aligned during exposure in a region with a large exposure amount through a subsequent heating step. It is possible to produce a large phase difference in order to solidify while maintaining a low level, and in a region where the exposure amount is small, the orientation of the liquid crystal compound is disturbed by heat during heating, so that a small phase difference is exhibited.

  Further, the film thickness of the liquid crystal immobilization layer 3 necessary for obtaining the above retardation is several μm, compared with a retardation film (film thickness is about 100 μm) produced by stretching a conventional film. The film thickness can be greatly reduced.

  Moreover, it is preferable that the angle formed by the transmission axis of the wire grid polarizer 2 and the slow axis or fast axis of the liquid crystal fixing layer 3 is 45 °. With such a configuration, a circularly polarized state can be obtained. In addition, a circularly polarized state is obtained when the linearly polarized light that has passed through the wire grid polarizer 2 passes through the λ / 4 plate.

Next, the organic EL display substrate 9 fixed so as to face the circularly polarizing plate 4 according to the embodiment of the present invention will be described. The organic EL display substrate 9 is, for example, an upper surface light extraction type element, and a reflective electrode 7 is formed on the substrate 8, and an anode made of a transparent conductive film such as ITO (Indium-Tin-Oxide) is formed thereon. To do. After the organic layer is overlaid on the anode, a metal cathode is formed. Here, a structure having an organic layer between the anode and the cathode is referred to as an organic EL layer 6. The organic layer may have a multilayer structure, and includes a light emitting layer that emits light by recombination of holes supplied from the anode and electrons supplied from the cathode. The thickness of the cathode is preferably about 10 nm, for example, so that light can be transmitted. Since the emitted light is extracted from above, a metal thin film having a low work function is preferable so that the cathode has high transmittance and electrons can be efficiently injected. For example, an aluminum / lithium alloy or a magnesium / silver alloy having a low work function is formed as thin as about 10 nm. In addition, the cathode can have a multilayer structure using different materials. A transparent conductive film made of ITO or the like is formed thereon. The film thickness of the transparent conductive film is preferably about 100 nm, for example, so as to have sufficient in-plane conductivity. The material for the transparent conductive film is preferably an oxide transparent conductive film containing one or more of indium oxide, tin oxide, and zinc oxide. In addition, a film made of an inorganic film such as SiN _X or SiO _X can be formed on the transparent conductive film to form a passivation film that protects the element from oxygen, moisture, and the like. Further, since a transparent conductive film such as ITO also has a barrier property, it can also be used as a passivation film.

  Next, a method for fixing the circularly polarizing plate 4 and the organic EL display substrate 9 obtained as described above to face each other will be described. FIGS. 3A and 3B are schematic views showing a method for bonding substrates according to an embodiment of the present invention. As shown in FIG. 3A, as an example of the immobilization method according to the embodiment of the present invention, the sealing layer 16 is provided on the outer periphery of the substrate, and the circularly polarizing plate 4 and the organic EL display substrate 9 are bonded. At the same time, internal components can be protected from oxygen, moisture, and the like in the external environment. The sealing layer 16 is formed of an adhesive such as a thermosetting type or an ultraviolet effect type, and includes glass beads, silica beads and the like. These beads define the distance between the substrates when the circularly polarizing plate 4 and the organic EL display substrate 9 are bonded together.

  In order to keep the distance between the substrates inside the sealing layer 16 uniform, spherical spacers such as glass beads and silica beads may be dispersed between the substrates. Alternatively, a columnar spacer such as an acrylic resin provided on the circularly polarizing plate 4 by a photolithography method or the like can be used.

Moreover, the internal space of the circularly polarizing plate 4 and the organic EL display substrate 9 can be filled with a filler. By using the inner space as the filling layer, reflection at the interface of the inner space can be suppressed, EL light can be transmitted efficiently, and the strength of the organic EL display device can be improved. The material of the filling layer is preferably a material having sufficient transparency to visible light, and includes, for example, inorganic materials such as SiN _X and SiO _X N _Y , organic materials such as acrylic resin and silicon gel.

  The filler may be applied or dispersed on the circularly polarizing plate 4 or the organic EL display substrate 9 before the circularly polarizing plate 4 and the organic EL display substrate 9 are bonded together. The gap between the substrates may be filled through an inlet provided in the layer 16.

  As another method for fixing the circularly polarizing plate 4 and the organic EL display substrate 9 to face each other, as shown in FIG. 3B, a thermosetting type processed into a sheet shape, an ultraviolet effect type, or the like is used. An adhesive 17 may be provided on the substrate to bond the circularly polarizing plate 4 and the organic EL display substrate 9 together. By fixing the circularly polarizing plate 4 and the organic EL display substrate 9 so as to face each other, the reflected light is halved by the circularly polarizing plate 4 for external light, and the wire grid polarizer 2 is used for EL light emission. When it reaches, half of the light is transmitted, and the other half of the light is reflected and reused, so that it is possible to suppress a decrease in the efficiency of light emission.

  FIG. 4 is a schematic cross-sectional view showing external light incident on the organic EL display device according to the embodiment of the present invention. FIGS. 5A to 5I are diagrams illustrating the organic EL according to the embodiment of the present invention. It is the schematic which shows external light reflection which injected into the display apparatus. In the organic EL display device manufactured by fixing the circularly polarizing plate 4 and the organic EL display substrate 9 to face each other as described above, the light enters the organic EL display device from the circularly polarizing plate 4 side as shown in FIG. The external light 18 is in a non-polarized state as shown in FIG. 5 (a), but is linearly polarized as shown in FIG. 5 (b) when passing through the wire grid polarizer 2 of the circularly polarizing plate 4. The light intensity is approximately halved by being converted to. Next, when the liquid crystal fixing layer 3 whose phase difference is controlled to ¼ of the wavelength of light is transmitted, a circularly polarized state as shown in FIG. 5C is obtained, and this is reflected by the reflective electrode 7. When the circularly polarized state is reversed as shown in FIG. 5 (d) and passes through the liquid crystal fixing layer 3 again, as shown in FIG. 5 (e), linearly polarized light inclined by 90 ° from the incident time is obtained. Become. The linearly polarized light is reflected by the wire grid polarizer 2, and as shown in FIGS. 5F to 5I, the linearly polarized light having the same direction as that of the incident light is obtained by following the same path as before. 2 is discharged to the outside. The intensity of the reflected light at this time is approximately half that of the incident light.

  6 is a schematic cross-sectional view showing extraction of EL light emission according to the embodiment of the present invention, and FIGS. 7A to 7F illustrate extraction of EL light emission according to the embodiment of the present invention. It is the schematic to explain. The EL light emission 19 from the organic EL layer 6 is in a non-polarized state as shown in FIG. 7A, but when it reaches the wire grid polarizer 2 of the circularly polarizing plate 4, FIG. As shown in FIG. 7, a polarized component having an electric field vector that oscillates in parallel to the metal wire (wire grid polarizer 2) is reflected, and orthogonal to the metal wire (wire grid polarizer 2) as shown in FIG. The polarized light component that vibrates in the light is transmitted (19a in FIG. 6). When the EL emission 19 reflected by the wire grid polarizer 2 passes through the liquid crystal immobilization layer 3 whose phase difference is controlled to ¼ of the wavelength of light, the circularly polarized state as shown in FIG. When this is reflected by the reflective electrode 7, the circularly polarized state is reversed as shown in FIG. 7 (e), and when it passes through the liquid crystal fixing layer 3 again, it is shown in FIG. 7 (f). As shown, it becomes linearly polarized light inclined by 90 ° from the time of reflection, and is emitted to the outside through the wire grid polarizer 2 (19b in FIG. 6).

  As described above, by using the circularly polarizing plate 4 according to the embodiment of the present invention, the EL light emission 19 can be taken out without being attenuated while the external light reflectance is suppressed to approximately 50%. It becomes a device.

  In addition, by setting the distance between the reflecting electrode 7 of the organic EL display substrate 9 and the reflecting surface of the wire grid polarizer 2 of the circularly polarizing plate 4 to 30 μm or less, the EL light emission 19 reflected by the wire grid polarizer 2 is reflected again. The parallax when the organic EL display device is observed from an oblique direction, which may occur when the second emitted light 20b reflected by the electrode 7 and extracted outside enters the adjacent pixel, can be suppressed. Here, when the distance of the reflective surface of each board | substrate is large, a mode when the organic electroluminescence display which concerns on embodiment of this invention from the diagonal direction is observed is shown to Fig.8 (a). In such a case, the emission position of the second emission light 20b of the EL light emission 19 reflected by the wire grid polarizer 2 and reflected again by the reflection electrode 7 and taken out to the outside is greatly shifted from the original pixel, so that Problems such as color mixing with pixels occur. Here, by setting the distance between the reflective surfaces of the respective substrates to 30 μm or less, as shown in FIG. 8B, the deviation of the emission position of the second emitted light 20b is reduced, and the organic EL display device is inclined from the oblique direction. The parallax when observed can be suppressed.

  Furthermore, the distance between the reflective electrode 7 of the organic EL display substrate 9 and the reflective surface of the wire grid polarizer 2 of the circularly polarizing plate 4 is preferably 1 μm or more. By setting the distance between the reflecting surfaces of each substrate to 1 μm or more, the chromaticity and luminance changes that are the characteristics of the EL light emission 19 are suppressed without interference between the first emitted light 20a and the second emitted light 20b. Here, when the distance between the reflective surfaces of the respective substrates is in the visible light wavelength order, the second emitted light 20b interferes with the first emitted light 20a that is transmitted without being reflected by the wire grid polarizer 2, and the EL. The chromaticity and luminance of the light emission 19 change.

  In order to realize the distance between the reflective electrode 7 of the organic EL display substrate 9 and the reflective surface of the wire grid polarizer 2 of the circularly polarizing plate 4 within the above range, a conventional retardation film is used as an intermediate retardation layer. Although it is impossible with a retardation film (film thickness of about 100 μm) produced by stretching, it can be achieved by using the liquid crystal immobilization layer (several μm) 3 according to the embodiment of the present invention.

  Examples of the present invention will be described below.

  First, as shown in FIG. 1A, a circularly polarizing plate 4 was manufactured. In the wire grid polarizer 2 used for the circularly polarizing plate 4 of this example, first, a chromium oxide and an aluminum film having a thickness of 0.15 μm are formed on the cleaned glass substrate 1. Subsequently, a positive photoresist is spin-deposited on the aluminum film. Next, exposure is performed by two-beam interference exposure, and development is performed, whereby the pattern exposure portion of the positive photoresist is removed, and the aluminum film is exposed. Subsequently, the exposed portion was removed from the etching solution, and finally the remaining resist was also removed, whereby a metal wire could be formed on the glass substrate 1. At this time, the pitch of the metal wire of the produced wire grid polarizer 2 was about 200 μm, and the thickness was about 0.15 μm.

  Next, “SE-1410” manufactured by Nissan Chemical Industries, Ltd., which is an alignment film material, was spin-deposited on the wire grid polarizer 2 so that the dry film thickness was 0.1 μm. Subsequently, the coating film was dried by heating for 1 minute at 90 ° C. using a hot plate. Subsequently, the coating film was baked at 230 ° C. for 40 minutes using a clean oven. Further, the coating film was rubbed in one direction parallel to the main surface to obtain an alignment film.

  Next, “Paliocolor LC 242” manufactured by BASF Japan Ltd. as a horizontally aligned polymerizable liquid crystal, “Irgacure 907” manufactured by Ciba Specialty Chemicals Co., Ltd., and “BYK111” manufactured by BYK Chemie as a surfactant. A 2% cyclohexanone solution and cyclohexanone were stirred to obtain a coating solution. This coating solution was applied on the alignment film by spin coating so that the dry film thickness was 1.6 μm. Subsequently, the coating film was dried by heating at 90 ° C. for 2 minutes using a hot plate. As described above, a liquid crystal material layer was formed on the alignment film.

  Next, the liquid crystal material layer was irradiated with ultraviolet rays, and the liquid crystal material layer was baked at 230 ° C. for 40 minutes using a clean oven, whereby the liquid crystal immobilization layer 3 was obtained. As described above, the circularly polarizing plate 4 shown in FIG.

  Next, as shown in FIG. 1A, an organic EL display substrate 9 was manufactured. In the organic EL display substrate 9 of this example, a reflective electrode 7 made of chromium is formed on a glass substrate 8, ITO is formed as an anode on the reflective electrode 7, and PEDOT: PSS is formed as a positive hole transport layer on the anode. MEHPPV (methoxyethylhexyloxypolyphenylvinylene) was laminated as a light emitting layer on the hole transport layer. Here, spin film formation was performed so that the film thickness of PEDOT: PSS was 50 nm and the film thickness of MEHPPV was 80 nm. Further, calcium is deposited to a thickness of 4 nm by vacuum deposition as a first cathode having a low work function so that electrons can be efficiently injected onto the light emitting layer, and a second cathode is formed on the first cathode. Aluminum was deposited to a thickness of 2 nm. Here, the aluminum used as the second cathode has a role to prevent calcium as the first cathode from being chemically altered when the transparent electrode formed thereon is formed by sputtering. Thus, an organic EL layer 6 was obtained. Next, a transparent conductive film was formed on the cathode by a sputtering method. Here, ITO was used as the transparent conductive film. Furthermore, a passivation film was formed by depositing 200 nm of silicon nitride on the transparent conductive film by a CVD method.

  The circularly polarizing plate 4 and the organic EL display substrate 9 manufactured as described above were opposed and fixed using the adhesive layer 5 to manufacture the organic EL display device of this example. At this time, the distance between the reflective electrode of the organic EL display substrate 9 and the reflective surface of the wire grid polarizer 2 of the circularly polarizing plate 4 was about 6.0 μm.

  When the external light reflectance and EL light emission transmittance in the organic EL display device of this example were measured using a spectrophotometer, the external light reflectance and EL light emission transmittance when the circularly polarizing plate 4 was not used were measured. When each was set to 100, the external light reflectance was 26% and the EL light emission transmittance was 81%, and it was confirmed that the external light reflection could be suppressed while minimizing the loss of EL light emission. In addition, even when observed from an oblique direction, no blur of the EL emission region and no change in luminance or chromaticity are observed. Therefore, the shift of the second emission light of EL emission, the first emission light of the EL emission and the first emission light are the same. It was confirmed that the interference effect of the two outgoing lights was suppressed.

  DESCRIPTION OF SYMBOLS 1 ... Transparent substrate, 2 ... Metal wire (wire grid polarizer), 3 ... Liquid crystal fixed layer, 4 ... Circularly polarizing plate, 5 ... Adhesive layer, 6R ... Red light emitting layer, 6G ... Green light emitting layer, 6B ... Blue light emission Layer 7, reflective electrode 8, substrate 9, organic EL display substrate 10, color filter, 11 R, red color filter layer, 11 G, green color filter layer, 11 B, blue color filter layer, 12, black matrix, 13 ... circular polarizing plate with color filter function, 14 ... polarized light oscillating parallel to the metal wire, 15 ... polarized light oscillating perpendicular to the metal wire, 16 ... sealing layer, 17 ... sheet adhesive, 18 ... external light, 19 ... EL emission, 20a ... first emission light of EL emission, 20b ... second emission light of EL emission

Claims (8)

A substrate,
A wire grid polarizer having a number of periodic linear metal wires formed on one side of the substrate;
A liquid crystal fixing layer having optical anisotropy formed on the wire grid polarizer;
A circularly polarizing plate comprising:   The period of the said metal wire is 240 nm or less, The circularly-polarizing plate of Claim 1 characterized by the above-mentioned.   The circularly polarizing plate according to claim 1, further comprising an antireflection layer on the substrate side of the metal wire.   4. The liquid crystal fixing layer is a λ / 4 plate such that light that has passed through the wire grid polarizer and becomes linearly polarized light becomes circularly polarized light. 5. The circularly polarizing plate as described in 2.   The circularly polarizing plate according to any one of claims 1 to 4, wherein the substrate is a color filter substrate. A first substrate; a wire grid polarizer having a number of periodic linear metal wires formed on the first substrate; and an optical anisotropy formed on the wire grid polarizer. A circularly polarizing plate comprising a liquid crystal immobilization layer;
A second substrate; a reflective electrode formed on the second substrate; an organic layer including a light emitting layer formed on the reflective electrode; and a light transmissive electrode formed on the organic layer; An organic EL display substrate comprising:
An organic EL display device, wherein the circularly polarizing plate and the organic EL display substrate are fixed by an adhesive layer.   The organic EL display device according to claim 6, wherein the organic EL display substrate extracts light from the light-transmissive electrode.   9. The organic EL display device according to claim 6, wherein a distance between the reflective electrode of the organic EL display substrate and a reflective surface of the wire grid polarizer of the circularly polarizing plate is 1 μm or more and 30 μm or less. The organic EL display device described.