JP7354370B2 - Organic EL display device - Google Patents

Description

The present invention relates to an organic EL display device.

An organic EL (OLED) display device has a structure in which a plurality of anodes, a plurality of organic light emitting layers, and a cathode are stacked on a substrate with a circuit formed on one side, as disclosed in Patent Document 1, for example. have Each anode and each organic light emitting layer are arranged, for example, in a grid pattern along the surface of the substrate. The plurality of organic light emitting layers include organic light emitting layers with different emission colors.

In organic EL display devices, it is desired to prevent deterioration in display performance due to reflection of external light. To address this problem, for example, Patent Document 1 discloses that a circularly polarizing plate is used to prevent external light from being reflected within the device and emitted to the outside of the device (hereinafter, this phenomenon is referred to as internal reflection). A method for preventing performance degradation is disclosed.

Patent No. 5752283

When a circularly polarizing plate is used, the amount of light emitted from the organic light emitting layer to the outside of the organic EL display device is significantly reduced compared to the amount of light generated in the organic light emitting layer. In consideration of such a decrease in light extraction efficiency from the organic light emitting layer, it is necessary to increase the output of the organic EL display device. This increases the power consumption of the organic EL display device. Therefore, when an organic EL display device is driven by a battery, there is a risk that the driving time may be shortened or the load on the organic EL display device may be increased.

Furthermore, organic EL display devices are increasingly being used in battery-powered applications in environments where they are exposed to relatively strong external light, such as in portable devices. Therefore, there is a possibility that such a problem will become noticeable.

Therefore, in an organic EL display device, it is possible to prevent deterioration of display performance due to internal reflection of external light without using a circularly polarizing plate, and to reduce power consumption compared to a case where a circularly polarizing plate is used. The purpose is to make it possible to improve the light extraction efficiency from the organic light emitting layer while suppressing the amount of light.

In order to solve the above problems, an organic EL display device according to one aspect of the present invention includes a first substrate provided with a circuit on one surface, and a circuit provided on the one surface side of the first substrate. a plurality of first electrodes connected to a circuit; and a plurality of organic light emitting layers disposed overlapping each of the plurality of first electrodes on a side opposite to the first substrate side of the plurality of first electrodes. , a second electrode disposed on a side of the plurality of organic light emitting layers opposite to the first substrate side and overlapping the plurality of organic light emitting layers; and a side of the second electrode opposite to the first substrate side. and a second substrate disposed opposite to the first substrate via the first electrode, the organic light emitting layer, and the second electrode, the plurality of organic light emitting layers emitting light of a plurality of colors. The haze value of the surface on the display screen side is set to a value in the range of 60% or more and 100% or less.

In the organic EL display device having the above configuration, the haze value of the surface on the display screen side is set to a value in the range of 60% to 100%. Therefore, reflected light of external light emitted from the inside of the device to the outside of the device can be efficiently scattered on the surface on the display screen side. This makes it possible to prevent external light from being reflected on the display screen. Therefore, deterioration in display performance due to internal reflection of external light can be prevented without using a circularly polarizing plate.

Further, it is possible to avoid reduction in light extraction efficiency from the organic light emitting layer due to the circularly polarizing plate. Therefore, compared to the case where a circularly polarizing plate is used, the light extraction efficiency from the organic light emitting layer can be significantly improved while suppressing power consumption.

The display device may further include a touch panel unit disposed overlappingly with respect to the first substrate and the second substrate, and the surface on the display screen side may be the input side surface of the touch panel unit. Thereby, even if the input side of the touch panel unit is on the display screen side, it is possible to prevent deterioration of display performance due to internal reflection of external light. Further, it is possible to ensure light extraction efficiency from the organic light emitting layer while suppressing power consumption.

The display device may further include a film member disposed overlapping the first substrate, and one surface of the film member may be the surface on the display screen side. Thereby, by setting the haze value on the surface of the film member to a value in the range of 60% or more and 100% or less, it is possible to prevent deterioration of display performance due to internal reflection of external light. Further, it is possible to ensure light extraction efficiency from the organic light emitting layer while suppressing power consumption.

Further, the total light transmittance of the film member may be set to a value in a range of 60% or more and 100% or less. Further, the gloss value of the film member at an incident angle of 60° may be set to a value in a range of 0% or more and 10% or less. In this way, by setting the total light transmittance of the film member and the gloss value at an incident angle of 60° to values within the above ranges, it is possible to further prevent deterioration in display performance due to internal reflection of external light.

The film member may include a plurality of resin components and may be formed by phase separation of the plurality of resin components. Thereby, for example, a large number of fine irregularities can be randomly formed on the surface of the film member by phase separation of a plurality of resin components, and the haze value of the film member can be easily set. Further, scattering of light transmitted through the film member can be prevented, and good display performance of the display device can be obtained.

The film member may further include a plurality of fine particles dispersed in the plurality of resin components. In this way, by using a plurality of fine particles together with the phase separation structure, it is possible to easily set the haze value of the film member.

The film member may include a matrix resin and a plurality of fine particles dispersed in the matrix resin. By dispersing a plurality of fine particles in the matrix resin in this manner, it is possible to easily set the haze value of the film member using a relatively simple method.

According to the present invention, in an organic EL display device, deterioration in display performance due to internal reflection of external light can be prevented without using a circularly polarizing plate, and power consumption can be suppressed compared to a case where a circularly polarizing plate is used. At the same time, the light extraction efficiency from the organic light emitting layer can be improved.

FIG. 1 is a cross-sectional view of an organic EL display device according to a first embodiment. FIG. 2 is a partially enlarged sectional view of the film member of FIG. 1; FIG. 7 is a partially enlarged sectional view of a film member according to a second embodiment. It is a figure which shows the manufacturing method of the film member based on 3rd Embodiment. FIG. 7 is a cross-sectional view of an organic EL display device according to a fourth embodiment.

(First embodiment)
1. Configuration of organic EL display device 1

A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an organic EL display device 1 (hereinafter also referred to as display device 1) according to the first embodiment. The display device 1 includes a display unit 2 and a touch panel unit 3 disposed overlapping the display unit 2.

The display unit 2 displays a screen when the display device 1 is driven. The display unit 2 includes a first substrate 4, a plurality of first electrodes 5, a plurality of hole injection layers 6, a plurality of organic light emitting layers 7, a plurality of electron injection layers 8, a second electrode 9, a sealing layer 10, a second It includes a substrate 11 and a bank 12.

The display device 1 is, for example, a top emission type, and light generated in the organic light emitting layer 7 is provided for screen display from the second substrate 11 side. That is, the display screen side of the display device 1 is the opposite side of the second substrate 11 from the first substrate 4 side.

The first substrate 4 has a circuit (for example, a TFT circuit) provided on one surface (hereinafter referred to as the first surface 4a). This circuit includes multiple TFTs. This TFT is arranged at a position corresponding to each first electrode 5. The other surface (second surface) 4b of the first substrate 4 is a flat surface.

The first electrode 5 is arranged on the first surface 4a side of the first substrate 4 and connected to the circuit. The first electrode 5 is made of a metal material, for example. The first electrode 5 is a reflective electrode. The first electrode 5 reflects the light generated in the organic light emitting layer 7 toward the second substrate 11 side. The plurality of first electrodes 5 are arranged in a grid along the first surface 4a of the first substrate 4. The first electrode 5 of this embodiment is an anode. The hole injection layer 6 is disposed overlapping the first electrode 5 and injects holes into the organic light emitting layer 7.

The organic light-emitting layer 7 is disposed on the opposite side of the first electrode 5 from the first substrate 4 side and overlaps the first electrode 5 . The organic light-emitting layer 7 emits light by recombining holes and electrons supplied from the outside.

Here, the plurality of organic light emitting layers 7 included in the display unit 2 include organic light emitting layers 7 of a plurality of emitting colors. Each organic light emitting layer 7 is arranged in one direction along the first surface 4a of the first substrate 4.

Specifically, the display device 1 includes a plurality of pixels 20 arranged in a grid pattern along the first surface 4a of the first substrate 4. The pixel 20 has a plurality of sub-pixels 21 arranged in parallel in the one direction along the first surface 4a of the first substrate 4.

In the display device 1 , the first electrode 5 and the organic light-emitting layer 7 are arranged at positions corresponding to the sub-pixels 21 when viewed from the display screen side of the display device 1 , and the first electrodes 5 and the organic light-emitting layer 7 are arranged at positions corresponding to the sub-pixels 21 in the pixel 20 . However, they emit light in different colors.

As an example, the pixel 20 has three sub-pixels 21 arranged in the one direction (in the horizontal direction in FIG. 1). These three sub-pixels 21 include an organic light emitting layer 7R that emits red light, an organic light emitting layer 7G that emits green light, and an organic light emitting layer 7B that emits blue light. In the display device 1, the organic light emitting layers 7R, 7G, and 7B are repeatedly arranged in parallel in the order of 7R, 7G, and 7B from one side to the other side in the one direction.

The electron injection layer 8 is disposed overlapping the first electrode 5 and injects electrons into the organic light emitting layer 7. The second electrode 9 is arranged on the side of the plurality of organic light emitting layers 7 opposite to the first substrate 4 side. The second electrode 9 is made of a transparent electrode material, for example. The second electrode 9 is a transparent electrode. The second electrode 9 transmits light generated in the organic light emitting layer 7 toward the second substrate 11 side.

The second electrode 9 is arranged along the first surface 4a of the first substrate 4 and connected to the electron injection layer 8. The second electrode 9 of this embodiment is a cathode. The sealing layer 10 is arranged to overlap the second electrode 9 and seals between the second electrode 9 and the second substrate 11. The sealing layer 10 includes transparent resin as an example.

The second substrate 11 is arranged opposite to the first substrate 4 with the first electrode 5, each layer 6 to 8, and the second electrode 9 interposed therebetween, on the opposite side of the second electrode 9 from the first substrate 4 side. There is. The bank 12 extends along the first surface 4a of the first substrate 4 in a direction perpendicular to the one direction, and partitions each layer 6 to 8 adjacent to the one direction.

The touch panel unit 3 receives user input operations from the display screen side of the display unit 2 in the display device 1 . The touch panel unit 3 is arranged to overlap the first substrate 4 and the second substrate 11.

The touch panel unit 3 has a unit main body 14 and a film member 15. The unit body 14 and the film member 15 are transparent. Light generated by the organic light emitting layer 7 in the display unit 2 passes through the touch panel unit 3 and is emitted from the display screen side of the display device 1 to the outside.

The unit main body 14 is formed in a sheet shape and is disposed overlapping the second substrate 11 on the side opposite to the first substrate 4 side. The unit main body 14 detects an input from the user and the input position via the film member 15. The input method of the unit main body 14 is, for example, a capacitance method, but is not limited thereto. The input method of the unit body 14 may be, for example, a resistive film method, a surface acoustic wave method, an infrared method, or an electromagnetic induction method.

The film member 15 is made of a transparent material and is disposed overlapping the surface of the unit body 14 on the opposite side to the second substrate 11 side. Thereby, the film member 15 is placed overlapping the first substrate 4. The film member 15 protects the unit body 14. The film member 15 is the outermost layer of the display device 1 on the display screen side. In the display device 1, one surface of the film member 15 (the surface opposite to the unit main body 14 side, hereinafter referred to as the first surface 15a) is the surface on the display screen side.

Film member 15 is an anti-glare (AG) film member. The film member 15 has a total light transmittance set to a value in the range of 60% or more and 100% or less. The haze value of the first surface 15a of the film member 15 is set to a value in the range of 60% or more and 100% or less. Further, the first surface 15a of the film member 15 has a gloss value set to a value of 0% or more and 10% or less at an incident angle of 60°.

Note that the total light transmittance can be measured based on a method based on JIS K7361. Further, the haze value can be measured using a haze meter based on a method based on JIS K7136. In addition, the gloss value is calculated using a gloss meter based on the method compliant with JIS Z8741 (specular gloss measurement method). However, it can be measured by measuring the light beam with a specified aperture angle reflected in the direction of specular reflection using a light receiver.

The other surface (second surface 15b) of the film member 15 is arranged to face the surface of the unit main body 14 on the opposite side from the display unit 2 side with an adhesive layer interposed therebetween. The film member 15 is fixed to the unit body 14 by this adhesive layer.

FIG. 2 is a partially enlarged cross-sectional view of the film member 15 of FIG. As shown in FIG. 2, a large number of fine irregularities are randomly formed on the first surface 15a of the film member 15. The film member 15 of this embodiment has a haze value set to a value in the range of 60% or more and 100% or less. Further, the film member 15 includes, for example, a plurality of resin components and is formed by phase separation of the plurality of resin components. Further, the internal haze value of the film member 15 is set to a value of less than 5%. The maximum thickness dimension of the film member 15 can be set as appropriate.

When the display device 1 is driven, power is supplied to the first electrode 5 and the second electrode 9 selected by the TFT circuit of the first substrate 4. At this time, holes are injected from the first electrode 5 through the hole injection layer 6 into the organic light emitting layer 7, and electrons are injected from the second electrode 9 into the organic light emitting layer 7 through the electron injection layer 8. As a result, holes and electrons are recombined (carrier recombination) within the organic light emitting layer 7, and the organic light emitting layer 7 emits light.

The light generated in the organic light emitting layer 7 passes through the electron injection layer 8, the second electrode 9, the second substrate 11, and the touch panel unit 3, and is emitted to the outside from the display screen side of the display device 1. The light is used for screen display as video output light. The light generated on the first substrate 4 side of the organic light emitting layer 7 is reflected by the first electrode 5, which is a reflective electrode, and is emitted to the outside from the display screen side of the display device 1, where it is effectively used for screen display. Ru.

Here, the conventional organic EL display device includes, for example, a circularly polarizing plate disposed on the optical path of light generated by the organic light emitting layer. The circularly polarizing plate prevents internal reflection of external light incident on the display screen of the organic EL display device. This prevents the display performance of the organic EL display device from deteriorating.

However, due to its characteristics, the circularly polarizing plate only transmits a portion of the light generated by the organic light emitting layer. Therefore, in an organic EL display device including a circularly polarizing plate, it is necessary to increase the output in order to compensate for the light extraction efficiency from the organic light emitting layer and obtain good display performance. This increases the power consumption of the organic EL display device. Therefore, when the organic EL display device is driven by a battery, the driving time is shortened. Furthermore, the load on the organic EL display device is increased. This shortens the life of the organic EL display device. Such problems may become more prominent as the use of organic EL display devices for portable devices such as smartphones and tablets expands.

On the other hand, in the display device 1, the haze value of the surface on the display screen side is set to a value in the range of 60% to 100%. Therefore, the reflected light of external light emitted from the inside of the display device 1 to the outside of the display device 1 can be efficiently scattered on the surface on the display screen side. This makes it possible to prevent external light from being reflected on the display screen. Therefore, deterioration in display performance due to internal reflection of external light can be prevented without using a circularly polarizing plate. Further, by setting the total light transmittance low, the reflected light of external light passes through the film member 15 twice, so that the reflected light can be further suppressed.

Further, since the haze value of the surface of the display screen side of the display device 1 is set to a value within the above range, external light reflected on the surface can be scattered. Thereby, it is possible to further prevent external light from being reflected on the display screen.

Further, it is possible to avoid reduction in light extraction efficiency from the organic light emitting layer 7 due to the circularly polarizing plate. Therefore, compared to the case where a circularly polarizing plate is used, the light extraction efficiency from the organic light emitting layer 7 can be significantly improved while suppressing power consumption.

Specifically, in this embodiment, the total light transmittance of the film member 15 is set to a value in the range of 60% or more and 100% or less. Therefore, the light extraction efficiency from the organic light emitting layer 7 can be improved by several tens of percent or more compared to the case where a circularly polarizing plate is used.

Furthermore, power consumption of the display device 1 can be suppressed. Therefore, when the display device 1 is driven by a battery, the size and capacity of the battery can be reduced. Thereby, the display device 1 can be easily made smaller and lighter.

Further, in the display device 1, the surface on the display screen side is the surface on the input side of the touch panel unit 3. In this way, even when the input side of the touch panel unit 3 is the display screen side, deterioration of display performance due to external light can be prevented. Further, the light extraction efficiency from the organic light emitting layer 7 can be improved while suppressing power consumption.

Further, in the display device 1, the first surface 15a of the film member 15 is the surface on the display screen side. Thereby, by setting the haze value of the first surface 15a of the film member 15 to a value in the range of 60% or more and 100% or less, deterioration of display performance due to external light can be prevented. Further, the light extraction efficiency from the organic light emitting layer 7 can be improved while suppressing power consumption.

Further, in the display device 1, the total light transmittance of the film member 15 is set to a value in a range of 60% or more and 100% or less. Further, the gloss value of the film member 15 at an incident angle of 60° is set to a value in the range of 0% to 10%. In this way, by setting the total light transmittance of the film member 15 and the gloss value at an incident angle of 60° to values within the above ranges, it is possible to further prevent deterioration of display performance due to internal reflection of external light.

Note that the display device 1 may include another layer (for example, a hole transport layer) disposed between the first electrode 5 and the organic light emitting layer 7. The display device 1 may also include other layers (for example, an electron transport layer) disposed between the organic light emitting layer 7 and the second electrode 9.

Further, the display device 1 may be of a bottom emission type in which light generated in the organic light emitting layer 7 is provided for screen display from the first substrate 4 side. In this case, it is necessary to use the first substrate 4 as a transparent substrate, the first electrode 5 as a transparent electrode, and the second electrode 9 as a reflective electrode. Alternatively, the first electrode 5 may be used as a cathode, and the second electrode 9 may be used as an anode. In this case, the hole injection layer 6 and the electron injection layer 8 need to be arranged oppositely to each other in the thickness direction of the first substrate 4. Further, in the display device 1, a plurality of organic light emitting layers 7 may be arranged in one subpixel 21 in an overlapping manner.

Further, the display device 1 may have a structure in which the touch panel unit 3 is arranged inside the display unit 2 in the thickness direction. In this way, even if the touch panel unit 3 is not exposed to the outside of the display device 1, it is only necessary that the haze value of the surface of the display screen side of the display device 1 is set to a value in the range of 60% to 100%. . In this case, if the display device 1 is a bottom emission type, the surface is, for example, the surface (second surface 4b) of the first substrate 4 opposite to the first electrode 5 side, and if the display device 1 is a top emission type. If it is a mold, it is, for example, the surface of the second substrate 11 on the opposite side to the second electrode 9 side.

In addition, in order to adjust the total light transmittance, the film member 15 may have a base film. Further, the film member 15 may have a layer on at least one surface for adjusting the total light transmittance. This layer may contain known dyes or pigments. Further, the layer may have irregularities formed on its surface. Next, the specific structure of the film member 15 will be explained.

2. Specific Configuration of Film Member The film member 15 of the first embodiment has a phase-separated structure of a plurality of resin components. As an example, the film member 15 has a plurality of elongated (string-like or linear) convex portions formed on the first surface 15a due to a phase-separated structure of a plurality of resin components. The elongated convex portions are branched and form a bicontinuous phase structure in a dense state.

The film member 15 has a plurality of elongated protrusions and recesses located between adjacent elongated protrusions to prevent external light reflected within the display device 1 and emitted from the display screen side of the display device 1. Scatter. By including such a film member 15, the display device 1 has an excellent effect of preventing reflection of external light. The first surface 15a of the film member 15 has a mesh structure, in other words, a plurality of irregular loop structures that are continuous or partially missing, by forming the elongated convex portions in a substantially mesh shape.

Further, the film member 15 includes a plurality of resin components and is formed by phase separation of the plurality of resin components. Further, the internal haze value of the film member 15 is set to a value of less than 5%.

Thereby, the haze value of the film member 15 can be appropriately set by randomly forming a large number of irregularities on the first surface 15a of the film member 15 by the phase separation structure. Further, by suppressing the internal haze value to a value of less than 5%, scattering of light transmitted through the film member 15 can be prevented, and good display performance of the display device 1 can be obtained.

The plurality of elongated convex portions may be independent from each other or may be connected to each other. The phase-separated structure of the film member 15 is formed by spinodal decomposition (wet spinodal decomposition) from the liquid phase using a solution that is a raw material for the film member 15, as described later. For details of the film member 15, for example, the description in JP-A-2014-085371 can be referred to.

The plurality of resin components included in the film member 15 may be anything that can be phase-separated, but from the viewpoint of obtaining the film member 15 in which elongated convex portions are formed and has high scratch resistance, polymers and curable resins are preferred. It is preferable to include.

An example of the polymer included in the film member 15 is a thermoplastic resin. Examples of thermoplastic resins include styrene resins, (meth)acrylic resins, organic acid vinyl ester resins, vinyl ether resins, halogen-containing resins, olefin resins (including alicyclic olefin resins), polycarbonate resins, Polyester resins, polyamide resins, thermoplastic polyurethane resins, polysulfone resins (polyethersulfone, polysulfone, etc.), polyphenylene ether resins (2,6-xylenol polymers, etc.), cellulose derivatives (cellulose esters, cellulose carbamates) silicone resins (polydimethylsiloxane, polymethylphenylsiloxane, etc.), rubbers or elastomers (diene rubbers such as polybutadiene, polyisoprene, styrene-butadiene copolymers, acrylonitrile-butadiene copolymers, Examples include acrylic rubber, urethane rubber, silicone rubber, etc. These thermoplastic resins can be used alone or in combination of two or more.

Examples of the polymer include those having a functional group that participates in a curing reaction or a functional group that reacts with a curable compound. This polymer may have a functional group in its main chain or side chain.

The functional group includes a condensable group, a reactive group (for example, a hydroxyl group, an acid anhydride group, a carboxyl group, an amino group or an imino group, an epoxy group, a glycidyl group, an isocyanate group, etc.), a polymerizable group (for example, C _2-6 alkenyl groups such as vinyl, propenyl, isopropenyl, butenyl, allyl groups, C _2-6 alkynyl groups such as ethynyl, propynyl, butynyl groups, C _2-6 alkenylidene groups such as vinylidene groups, or polymerization thereof Examples include groups having a functional group ((meth)acryloyl group, etc.). Among these functional groups, polymerizable groups are preferred.

Further, the film member 15 may contain multiple types of polymers. Each of these polymers may be phase-separable by spinodal decomposition from the liquid phase, or may be incompatible with each other. The combination of the first polymer and the second polymer included in the plurality of types of polymers is not particularly limited, but those that are incompatible with each other near the processing temperature can be used.

For example, when the first polymer is a styrene resin (polystyrene, styrene-acrylonitrile copolymer, etc.), the second polymer may be a cellulose derivative (for example, cellulose esters such as cellulose acetate propionate), ( meth)acrylic resins (polymethyl methacrylate, etc.), alicyclic olefin resins (polymers containing norbornene as a monomer, etc.), polycarbonate resins, polyester resins (polyC _2-4 alkylene arylate copolyester) etc.) can be exemplified.

For example, when the first polymer is a cellulose derivative (for example, cellulose esters such as cellulose acetate propionate), the second polymer may be a styrenic resin (polystyrene, styrene-acrylonitrile copolymer, etc.), Examples include (meth)acrylic resins, alicyclic olefin resins (polymers containing norbornene as a monomer, etc.), polycarbonate resins, polyester resins (polyC _2-4 alkylene arylate copolyesters, etc.), etc. .

The plurality of types of polymers may contain at least cellulose esters (for example, cellulose C _2-4 alkyl carboxylic acid esters such as cellulose diacetate, cellulose triacetate, cellulose acetate propionate, and cellulose acetate butyrate). good.

Here, the phase separation structure of the film member 15 is such that the precursor of the curable resin contained in the plurality of resin components is cured by active energy rays (ultraviolet rays or electron beams, etc.), heat, etc. during the production of the film member 15. It is fixed by doing this. Further, such a curable resin provides the film member 15 with scratch resistance and durability.

From the viewpoint of obtaining scratch resistance of the film member 15, at least one polymer included in the plurality of types of polymers is preferably a polymer having a functional group capable of reacting with the curable resin precursor in its side chain. The polymer forming the phase-separated structure may include thermoplastic resins and other polymers in addition to the two mutually incompatible polymers described above. The weight ratio M1/M2 between the weight M1 of the first polymer and the weight M2 of the second polymer and the glass transition temperature of the polymer can be set as appropriate.

The curable resin precursor has a functional group that reacts with active energy rays (ultraviolet rays or electron beams, etc.), heat, etc., and is cured or crosslinked by this functional group to form a resin (especially a cured resin or a crosslinked resin). Examples of curable compounds include:

Such compounds include thermosetting compounds or thermosetting resins (low molecular weight compounds having epoxy groups, polymerizable groups, isocyanate groups, alkoxysilyl groups, silanol groups, etc.) (for example, epoxy resins, unsaturated polyester-based (resins, urethane resins, silicone resins, etc.), photocurable (ionizing radiation curable) compounds that are cured by ultraviolet rays, electron beams, etc. (ultraviolet curable compounds such as photocurable monomers, oligomers, etc.), etc. .

Examples of preferred curable resin precursors include photocurable compounds that cure in a short time with ultraviolet rays, electron beams, and the like. Among these, UV-curable compounds are particularly practical. In order to improve resistance such as scratch resistance, the photocurable compound preferably has two or more (preferably about 2 to 15, more preferably about 4 to 10) polymerizable unsaturated bonds in the molecule. Specifically, photocurable compounds include epoxy (meth)acrylate, urethane (meth)acrylate, polyester (meth)acrylate, silicone (meth)acrylate, and polyfunctional monomers having at least two polymerizable unsaturated bonds. It is preferable that there be.

The curable resin precursor may contain a curing agent depending on its type. For example, the thermosetting resin precursor may contain a curing agent such as amines and polyvalent carboxylic acids, and the photocurable resin precursor may contain a photopolymerization initiator. Examples of the photopolymerization initiator include conventional components such as acetophenones, propiophenones, benzyls, benzoins, benzophenones, thioxanthones, and acylphosphine oxides.

Further, the curable resin precursor may contain a curing accelerator. For example, the photocurable resin precursor may contain a photocuring accelerator, such as tertiary amines (dialkylaminobenzoic acid ester, etc.), a phosphine photopolymerization accelerator, and the like.

In the manufacturing process of the film member 15, at least two components of the polymer and the curable resin precursor contained in the solution serving as the raw material of the film member 15 are used in a combination that causes phase separation from each other near the processing temperature. Combinations for phase separation include, for example, (a) a combination in which multiple types of polymers are incompatible with each other and phase-separated; (b) a combination in which a polymer and a curable resin precursor are incompatible and phase-separated; , (c) a combination in which a plurality of curable resin precursors are mutually incompatible and phase-separated, and the like. Among these combinations, there are usually (a) combinations of multiple types of polymers, and (b) combinations of polymers and curable resin precursors, and in particular (a) combinations of multiple types of polymers. preferable.

Here, the polymer and the cured resin or crosslinked resin produced by curing the curable resin precursor usually have different refractive indexes from each other. Further, the refractive indexes of the plurality of types of polymers (the first polymer and the second polymer) are also usually different from each other. The refractive index difference between the polymer and the cured resin or crosslinked resin, and the refractive index difference between multiple types of polymers (first polymer and second polymer) are determined according to the optical properties required of the film member 15. It can be set as appropriate.

The film member 15 may contain conventional additives, such as stabilizers (antioxidants, ultraviolet absorbers, etc.), surfactants, water-soluble polymers, fillers, crosslinking agents, and cups, to the extent that optical properties are not impaired. Ring agents, colorants, flame retardants, lubricants, waxes, preservatives, viscosity modifiers, thickeners, leveling agents, antifoaming agents, etc. may be included.

The method for manufacturing the film member 15 includes, for example, a preparation process, a formation process, and a curing process. In the preparation step, a solution (hereinafter also simply referred to as a solution) that is a raw material for the film member 15 is prepared. In the formation step, the solution prepared in the preparation step is applied to the surface of a predetermined support, the solvent in the solution is evaporated, and a phase-separated structure is formed by spinodal decomposition from the liquid phase. In the curing process, the curable resin precursor is cured after the formation process.

[Preparation process]
In the preparation step, a solution containing a solvent and a resin composition for forming the film member 15 is prepared. The solvent can be selected depending on the type and solubility of the polymer and curable resin precursor contained in the film member 15 described above. The solvent may be any solvent as long as it can uniformly dissolve at least the solid content (multiple types of polymers, curable resin precursors, reaction initiators, and other additives).

Examples of solvents include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons (cyclohexane, etc.) , aromatic hydrocarbons (toluene, xylene, etc.), halogenated carbons (dichloromethane, dichloroethane, etc.), esters (methyl acetate, ethyl acetate, butyl acetate, etc.), water, alcohols (ethanol, isopropanol, butanol, cyclo hexanol, etc.), cellosolves (methyl cellosolve, ethyl cellosolve, etc.), cellosolve acetates, sulfoxides (dimethyl sulfoxide, etc.), amides (dimethylformamide, dimethylacetamide, etc.), and the like. Further, the solvent may be a mixed solvent.

The resin composition is preferably a composition containing the thermoplastic resin, a photocurable compound, a photopolymerization initiator, the thermoplastic resin, and the photocurable compound. Alternatively, the resin composition is preferably a composition containing the plural types of mutually incompatible polymers, a photocurable compound, and a photopolymerization initiator.

The concentration of solutes (polymer and curable resin precursor, reaction initiator, and other additives) in the solution should be within a range that causes phase separation of multiple resin components and within a range that does not impair the flowability, coating properties, etc. of the solution. It can be adjusted at

Here, the gloss value of the film member 15 may vary depending on the combination and weight ratio of a plurality of resin compositions in the solution, or the construction conditions of the preparation process, formation process, and curing process. Therefore, the film member 15 having a desired gloss value can be obtained by forming test specimens of the film member by changing various conditions and measuring and understanding the physical properties of the obtained test specimens in advance.

[Formation process]
In the forming step, the solution prepared in the preparation step is cast or applied onto the smooth surface of the support. The solution can be cast or applied using conventional methods such as spray, spinner, roll coater, air knife coater, blade coater, rod coater, reverse coater, bar coater, comma coater, dip, dip/squeeze coater, and Daico. Examples include a gravure coater, a gravure coater, a microgravure coater, and a silk screen coater.

The solvent is removed by drying and evaporation from the solution cast or coated on the surface of the support. As the solution is concentrated during this evaporation process, phase separation occurs due to spinodal decomposition of a plurality of resin components from the liquid phase, forming a phase separation structure with relatively regular interphase distances (pitch or mesh diameter). The co-continuous phase structure of elongated convex portions can be formed by setting drying conditions and formulations such that the melt fluidity of the resin component after solvent evaporation is increased to some extent.

The solvent is preferably evaporated by heating and drying from the viewpoint of facilitating the formation of elongated convex portions on the first surface 15a of the film member 15. If the drying temperature of the solvent is too low or the drying time is too short, the amount of heat applied to the resin component will be insufficient, the melt fluidity of the resin component will decrease, and it will be difficult to form elongated convex parts. Please note that there is a risk.

If the drying temperature of the solvent is too high or the drying time is too long, the elongated protrusions once formed may flow and reduce in height, but the structure of the elongated protrusions is maintained. . Therefore, drying temperature and drying time can be used as a means to change the height of the elongated convex portion. Further, in the formation step, a co-continuous phase structure in which phase-separated structures are connected can be formed by increasing the evaporation temperature of the solvent or using a component with low viscosity as the resin component.

As phase separation progresses due to spinodal decomposition of multiple resin components from the liquid phase, a co-continuous phase structure is formed and coarsened, and the continuous phase becomes discontinuous, forming a droplet phase structure (spherical, true spherical, discoidal). Sea-island structures with independent phases such as ellipsoidal or ellipsoidal shapes are formed. Here, depending on the degree of phase separation, an intermediate structure between a co-continuous phase structure and a droplet phase structure (a phase structure in the process of transitioning from a co-continuous phase to a droplet phase) can also be formed. After the solvent is removed, a layer with many fine irregularities is formed on the outer surface.

In this way, by forming a large number of fine irregularities on the outer surface through phase separation, the gloss value of the film member 15 can be adjusted without dispersing fine particles in the film member 15. Further, since it is not necessary to disperse fine particles in the film member 15, it is possible to easily adjust the gloss value of the film member 15 while suppressing the internal haze value compared to the external haze value. Note that the film member 15 containing fine particles can also be formed by adding fine particles to the solution in the preparation process.

[Curing process]
In the curing process, the curable resin precursor in the solution is cured, thereby fixing the phase separation structure formed in the forming process, and forming the film member 15. Curing of the curable resin precursor is performed by heating, irradiation with active energy rays, or a combination of these methods, depending on the type of the curable resin precursor. The active energy ray to be irradiated is selected depending on the type of photocuring component and the like.

Irradiation with active energy rays may be performed in an inert gas atmosphere. If the active energy rays are ultraviolet rays, use a far ultraviolet lamp, low-pressure mercury lamp, high-pressure mercury lamp, ultra-high-pressure mercury lamp, halogen lamp, laser light source (light source such as helium-cadmium laser, excimer laser, etc.) as the light source. I can do it. The film member 15 is manufactured through the above steps.

3. Modification As a modification of the first embodiment, the film member 15 can further include a plurality of fine particles dispersed in a plurality of resin components. In this way, by using a plurality of fine particles together with a phase-separated structure, it is possible to easily set the haze value of the film member 15.

The fine particles in this case may be either organic fine particles or inorganic fine particles. Further, the film member 15 may contain multiple types of fine particles. Examples of organic fine particles include crosslinked acrylic particles and crosslinked styrene particles. Examples of inorganic fine particles include silica particles and alumina particles. The average particle size of the fine particles is not particularly limited. The fine particles may be solid or hollow.

(Second embodiment)
FIG. 3 is a partially enlarged sectional view of the film member 115 according to the second embodiment. As shown in FIG. 3, the film member 115 according to the second embodiment includes a matrix resin 116 and a plurality of fine particles 117 dispersed in the matrix resin 116. The fine particles 117 are formed into solid, true spheres here. Fine particles 117 are dispersed and arranged in the film member 115 as primary particles.

Note that the fine particles 117 may be formed into a distorted spherical shape or an ellipsoidal shape. Further, the fine particles 117 may be formed hollow. When the fine particles 117 are formed hollow, the hollow portions of the fine particles 117 may be filled with air or other gas. Further, a plurality of secondary particles formed by agglomerating a plurality of fine particles 117 may be dispersed in the film member 115.

It is desirable that the variation in particle size of the fine particles 117 is small. For example, in the particle size distribution of the fine particles 117 contained in the film member 115, the average particle size of 50% by weight or more of the fine particles 117 contained in the film member 115 (50% volume average particle size in the Coulter counter method) is 1.0 μm. It is desirable that the variation be within the following range. Since the film member 115 includes a plurality of fine particles 117, a large number of irregularities of appropriate size are randomly formed on the first surface 115a of the film member 115.

As described above, in the second embodiment, by dispersing the plurality of fine particles 117 in the matrix resin 116, it is possible to easily set the haze value of the film member 115 using a relatively simple method.

The ratio between the weight of the matrix resin 116 and the total weight of the plurality of fine particles 117 in the film member 115 can be set as appropriate. The fine particles 117 may be either inorganic or organic, but preferably have good transparency.

An example of the organic fine particles 117 is plastic beads. Examples of plastic beads include styrene beads (refractive index 1.59), melamine beads (refractive index 1.57), acrylic beads (refractive index 1.49), acrylic-styrene beads (refractive index 1.54), polycarbonate beads, Examples include polyethylene beads. The styrene beads may be crosslinked styrene beads and the acrylic beads may be crosslinked acrylic beads. The plastic beads preferably have hydrophobic groups on their surfaces. Examples of such plastic beads include styrene beads.

Examples of the matrix resin 116 include at least one of a photocurable resin that is cured by active energy rays, a solvent drying resin that is cured by drying a solvent added during coating, and a thermosetting resin.

Photocurable resins include those having acrylate functional groups, such as relatively low molecular weight polyester resins, polyether resins, acrylic resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, and polythiol polyenes. Examples include resins, oligomers such as (meth)allylates of polyfunctional compounds such as polyhydric alcohols, prepolymers, and reactive diluents.

Specific examples of these include monofunctional monomers such as ethyl (meth)acrylate, ethylhexyl (meth)acrylate, styrene, methylstyrene, and N-vinylpyrrolidone, as well as polyfunctional monomers such as polymethylolpropane tri(meth)acrylate, hexane, etc. Diol (meth)acrylate, tripropylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,6-hexanediol di(meth)acrylate , neopentyl glycol di(meth)acrylate, and the like.

When the photocurable resin is an ultraviolet curable resin, it is preferable to use a photopolymerization initiator. Examples of the photopolymerization initiator include acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, tetramethylthiuram monosulfide, and thioxanthone. It is also preferable to mix a photosensitizer with the photocurable resin. Examples of the photosensitizer include n-butylamine, triethylamine, and poly-n-butylphosphine.

Examples of the solvent-drying resin include known thermoplastic resins. Examples of this thermoplastic resin include styrene resin, (meth)acrylic resin, vinyl acetate resin, vinyl ether resin, halogen-containing resin, alicyclic olefin resin, polycarbonate resin, polyester resin, polyamide resin, Examples include cellulose derivatives, silicone resins, rubbers, and elastomers. As the solvent-drying resin, resins that are soluble in organic solvents and have particularly excellent moldability, film-forming properties, transparency, and weather resistance are desirable. Examples of such solvent-drying resins include styrene resins, (meth)acrylic resins, alicyclic olefin resins, polyester resins, and cellulose derivatives (cellulose esters, etc.).

Here, as the thermoplastic resin used for the solvent drying resin, cellulose resin can be exemplified. Examples of the cellulose resin include cellulose derivatives such as nitrocellulose, acetylcellulose, acetylbutylcellulose, ethylcellulose, methylcellulose, cellulose acetate propionate, and ethylhydroxyethylcellulose.

In addition, examples of solvent-drying resins include vinyl resins, acetal resins, acrylic resins, polystyrene resins, polyamide resins, and polycarbonate resins.

Thermosetting resins include phenol resin, urea resin, diallyl phthalate resin, melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea cocondensation resin, silicone resin, and polysiloxane. Examples include resin. When a thermosetting resin is used as the matrix resin 116, at least one of a crosslinking agent, a curing agent such as a polymerization initiator, a polymerization accelerator, a solvent, a viscosity modifier, etc. may be used in combination.

The method for manufacturing the film member 115 in the second embodiment includes, as an example, a preparation process, a coating process, and a curing process, similarly to the first embodiment. In the preparation step, a solution that is a raw material for the film member 115 is prepared. In the coating step, the solution prepared in the preparation step is applied to the surface of a predetermined support. In the curing step, the resin in the applied solution is cured.

[Preparation process]
In the preparation step, a solution containing a solvent, a resin composition for forming the film member 115, and fine particles 117 is prepared. Examples of solvents include alcohols (isopropyl alcohol, methanol, ethanol, etc.), ketones (methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), cyclohexanone, etc.), esters (methyl acetate, ethyl acetate, butyl acetate, etc.), and halogens. Examples include at least one of hydrogenated hydrocarbons and aromatic hydrocarbons (toluene, xylene, etc.). A known leveling agent may also be added to the solution. For example, by using a fluorine-based or silicone-based leveling agent, good scratch resistance can be imparted to the film member 115.

[Coating/curing process]
In the coating step, the solution prepared in the preparation step is cast or coated on the surface of the support by the same method as in the first embodiment. The solvent is removed by drying and evaporation from the solution cast or coated on the surface of the support.

When the matrix resin 116 is a photocurable resin, a curing process using ultraviolet rays or an electron beam is performed after the coating process, for example. Examples of the ultraviolet light source include various mercury lamps, ultraviolet carbon arc lamps, black lights, and metal halide lamps. Further, as the wavelength range of ultraviolet rays, for example, a wavelength range of 190 nm or more and 380 nm or less can be exemplified.

Further, as the electron beam source, a known electron beam accelerator can be exemplified. Specifically, various electron beam accelerators such as a Van de Graff type, a Cockcroft-Walton type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, and a high frequency type can be exemplified.

By curing the matrix resin 116 contained in the solution, the positions of the fine particles 117 in the matrix resin 116 are fixed. As a result, it is possible to obtain a film member 115 having a structure in which a plurality of fine particles 117 are dispersed in the matrix resin 116 and a large number of irregularities formed by the plurality of fine particles 117 are formed on the first surface 115a.

(Third embodiment)
FIG. 4 is a diagram showing a method of manufacturing a film member 215 according to the third embodiment. The film member 215 has a structure in which an uneven shape is formed on the surface. The film member 215 is made of a resin film.

Specifically, the film member 215 is manufactured by forming a coat layer containing a curable resin on a predetermined base film, shaping the surface of this coat layer into an uneven shape, and then curing the coat layer. . In the example of FIG. 4, an ultraviolet curable resin is used as the curable resin.

As shown in FIG. 4, in this manufacturing method, a base film 40 is unwound from an unwinding roll (not shown) and conveyed in a predetermined direction. The downstream end of the base film 40 in the transport direction is inserted into the nip point N1 between the pair of rolls 31 and 32.

An ultraviolet curable resin precursor is applied to the circumferential surface of the roll 32 from the circumferential surface of a roll 33 that is pivotally supported adjacent to the roll 32 . When the base film 40 passes through the nip point N1, this ultraviolet curing resin precursor is applied to one surface of the base film 40.

The layer of the ultraviolet curable resin precursor applied to the base film 40 (hereinafter referred to as a coat layer) is pressed together with the base film 40 at the nip point between the rolls 31 and 34. The roll 34 is a roll-shaped mold (embossed roll) with fine irregularities formed on its circumferential surface, and when passing through the nip point N2 between the rolls 31 and 34, the irregular shape is transferred to the surface of the coating layer.

The coat layer with the uneven shape transferred onto the surface by the roll 34 is cured by ultraviolet rays irradiated from an ultraviolet lamp (not shown) provided below the rolls 31 and 34. Thereby, the film member 215 is formed on the base film 40. The thus manufactured laminate of the film member 215 and the base film 40 is released from the roll 34 by the roll 35 which is pivotally supported adjacent to the roll 34, and is conveyed in a predetermined direction. The film member 215 is peeled off from the base film 40.

Here, the uneven portions on the surface of the roll 34 are formed by bombarding blast particles of a predetermined particle size by a blasting method, and by adjusting the blast particle size, the uneven portions formed on the film member 215 are formed. The shape can be adjusted.

As the base film 40, a PET (polyethylene terephthalate) film, a TAC (triacetyl cellulose) film, a COP (cycloolefin polymer) film, an acrylic resin film, or a polycarbonate resin film can be suitably used.

As described above, the method for manufacturing the film member 215 includes the steps (a) of applying a curable resin precursor to the base film 40, and bombarding the curable resin precursor with blast particles to form an uneven shape on the surface of the curable resin precursor. step (b) of producing a roll-shaped mold; step (c) of transferring the uneven shape to the surface of the curable resin precursor applied to the base film 40 using this roll-shaped mold; and a step (d) of curing the curable resin precursor to which the curable resin precursor has been transferred to form a film member 215 having an uneven surface.

The average particle diameter of the blast particles used in step (b) can be set as appropriate, and for example, can be set to a value in the range of 10 μm or more and 50 μm or less. The average particle diameter of the blast particles is more preferably in the range of 20 μm or more and 45 μm or less, and more preferably in the range of 30 μm or more and 40 μm or less. As a result, a film member 215 having an uneven shape formed on the surface is obtained.

Note that the mold used in the third embodiment may be other than a roll mold, and may be, for example, a plate mold (embossed plate). Alternatively, the film member 215 may be formed by forming a coat layer (resin layer) on one surface of the base film, shaping the surface of this coat layer with a mold, and curing the coat layer. good. Further, in the above example, the coat layer was cured after shaping the surface of the coat layer, but the shaping and curing of the coat layer may be performed in parallel.

Examples of the material of the mold include metal, plastic, and wood. A coating may be provided on the contact surface of the mold with the coating layer in order to improve the durability (wear resistance) of the mold.

Examples of the material of the blast particles include metal, silica, alumina, and glass. The blast particles can be impacted against the surface of the mold by, for example, gas or liquid pressure. Additionally, if the cured resin precursor is an electron beam curing type, an electron beam source such as an electron beam accelerator can be used instead of an ultraviolet lamp, and if it is thermosetting, a heating source such as a heater can be used instead of an ultraviolet lamp. Available.

Note that the film member 215 may further include a resin layer and an upper layer disposed on the surface of the resin layer. By providing this upper layer, the external haze value of the film member 215 can be easily adjusted, and the film member 215 can be easily protected from the outside.

The thickness of the upper layer can be set as appropriate, and can be set to a value in the range of 0.5 μm or more and 20 μm or less, for example. The thickness of the upper layer is more preferably in the range of 2.0 μm or more and 12 μm or less, and even more preferably in the range of 3.0 μm or more and 8.0 μm or less.

(Fourth embodiment)
FIG. 5 is a cross-sectional view of an organic EL display device 100 according to the fourth embodiment. As shown in FIG. 5, the display device 100 does not include the touch panel unit 3. Further, the display unit 102 included in the display device 100 is of a bottom emission type. That is, the first substrate 104 and the first electrode 105 are transparent, and the second electrode 109 is a reflective electrode.

In the display device 100, the surface of the first substrate 104 opposite to the first electrode 105 is the display screen side. In the display device 100, the film member 15 is arranged to overlap the surface of the first substrate 104 opposite to the first electrode 105. The display device 100 having such a configuration also provides the same effects as the display device 1 of the first embodiment.

Note that the film member 115 may be used instead of the film member 15. Furthermore, the display device 100 may be of a top emission type. In this case, the film member 15 can be placed overlappingly on the surface of the second substrate 111 opposite to the second electrode 109.

Further, in the second embodiment, the display device 100 is configured to include the film member 15, but the film member 15 may be omitted. In this case, the haze value of the surface of the display screen side of the display device 100 may be set to a value in the range of 60% or more and 100% or less. The surface in this case is, for example, the surface of the first substrate 104 opposite to the first electrode 105 side if the display device 100 is a bottom emission type, and if the display device 100 is a top emission type, for example, This is the surface of the second substrate 111 opposite to the second electrode 109 side. That is, in the substrate on the display screen side of the first substrate 104 and the second substrate 111, the haze value of the surface on the display screen side can be set to a value in the range of 60% or more and 100% or less.

(confirmation test)
The film member 15 in the first embodiment was produced as Example 1. A film member 115 in the second embodiment was produced as Example 2. A film member 215 in the third embodiment was produced as Example 3. A polarizing plate (manufactured by Nitto Denko Co., Ltd., thickness: 203 μm) was prepared by laminating TAC, polyvinyl alcohol (PVA), TAC, and an adhesive layer in this order as a comparative example.

For Examples 1 to 3 and Comparative Examples, haze values (%) were measured based on a method based on JIS K7136. Further, for Examples 1 to 3 and Comparative Examples, the total light transmittance (%) was measured based on a method based on JIS K7361. Further, for Examples 1 to 3 and Comparative Examples, the gloss value (%) at an incident angle of 60° was measured based on a method based on JIS Z8741.

Furthermore, for Examples 1 to 3 and Comparative Examples, the luminance brightness (%) was measured by the following method. The film members of Examples 1 to 3 or the polarizing plates of Comparative Example were stacked on the light extraction side of the display unit 2 having a similar configuration, and the film members of Examples 1 to 3 or the polarizing plate of Comparative Example were stacked under the same driving conditions. The luminance of the display unit 2 through the polarizing plate was measured using a CCD camera. The measured values of luminance of Examples 1 to 3 and Comparative Example were then converted into relative values with Example 1 taken as 100%. The results of these measurements are shown in Table 1.

From the results shown in Table 1, Examples 1 to 3 have almost the same high luminance and high total light transmittance as compared to the comparative example, so that the light generated by the organic light emitting layer It was confirmed that it can be effectively used for screen display. Further, in Examples 1 to 3, the gloss value (%) at an incident angle of 60° was at least 9% or less, which was confirmed to be significantly lower than that of the comparative example. As a result, in Examples 1 to 3, it was found that external light was less likely to be reflected on the display screen.

Further, according to another study by the inventors of the present application, even when the gloss value (%) at an incident angle of 60° was changed in the range of 0% to 10% in each of the film members of Examples 1 to 3, It was found that almost the same excellent performance could be obtained.

Further, in each of the film members of Examples 1 to 3, when the haze value was changed in the range of 60% to 100%, and the total light transmittance was changed in the range of 60% to 100%. It was found that almost the same excellent performance can be obtained in both cases.

The present invention is not limited to each embodiment, and the configuration can be changed, added, or deleted without departing from the spirit of the present invention. As a method for forming irregularities on the surface of the screen display side of the display device, for example, using a shaping member such as a shaping roll having irregularities formed on the circumferential surface, irregularities are formed on the surface of the screen display side of the display device. A method of transferring may also be used.

Further, the film members 15, 115, and 215 may be anti-reflection (AR) film members that prevent reflection of external light by causing incident light and reflected light to interfere and cancel each other out. In this case, the film members 15, 115, 215 can be configured to have, for example, a base film disposed on the display screen side and an antireflection film laminated on the base film. Further, in this case, the surface of the antireflection film opposite to the base film side becomes the surface on the image display side of the display device.

As described above, the present invention can prevent deterioration of display performance due to internal reflection of external light without using a circularly polarizing plate in an organic EL display device, and can reduce power consumption compared to the case where a circularly polarizing plate is used. It has an excellent effect of improving the efficiency of light extraction from the organic light emitting layer while suppressing this. Therefore, it is beneficial to widely apply the present invention to organic EL display devices that can exhibit the significance of this effect.

1,100 Organic EL display device 3 Touch panel unit 4,104 First substrate 5,105 First electrode 7,7R, 7G, 7B Organic light emitting layer 9,109 Second electrode 11,111 Second substrate 15,115,215 Film Component 116 Matrix resin 117 Fine particles

Claims (7)

a first substrate with a circuit provided on one side;
a plurality of first electrodes arranged on the one surface side of the first substrate and connected to the circuit;
a plurality of organic light emitting layers disposed overlapping each of the plurality of first electrodes on a side opposite to the first substrate side of the plurality of first electrodes;
a second electrode disposed overlapping the plurality of organic light emitting layers on a side opposite to the first substrate side of the plurality of organic light emitting layers;
a second substrate disposed opposite to the first substrate with the first electrode, the organic light emitting layer, and the second electrode interposed on the opposite side of the second electrode to the first substrate;
a film member disposed overlapping the first substrate,
The plurality of organic light emitting layers include the organic light emitting layers of a plurality of emitting colors,
The haze value of the surface on the display screen side, which is one surface of the film member , which is arranged so as to be in contact with the outside air, is set to a value in the range of 65% to 80%, and the haze value is set to a value in the range of 65% to 80%, and The light is of a top emission type and is provided for screen display from the second substrate side,
An organic EL display device in which arrangement of a circularly polarizing plate on an optical path of light generated in the plurality of organic light emitting layers is omitted. further comprising a touch panel unit disposed overlappingly with respect to the first substrate and the second substrate,
The organic EL display device according to claim 1, wherein the surface on the display screen side is the input side surface of the touch panel unit. The organic EL display device according to claim 1 or 2 , wherein the total light transmittance of the film member is set to a value in a range of 60% or more and 100% or less. The organic EL display device according to any one of claims 1 to 3, wherein a gloss value of the film member at an incident angle of 60° is set to a value in a range of 0% or more and 10% or less. 5. The organic EL display device according to claim 1 , wherein the film member includes a plurality of resin components and is formed by phase separation of the plurality of resin components. The organic EL display device according to claim 5 , wherein the film member further includes a plurality of fine particles dispersed in the plurality of resin components. The organic EL display device according to claim 1 , wherein the film member includes a matrix resin and a plurality of fine particles dispersed in the matrix resin .

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