Optical laminate and display system

Abstract

Provided is an optical laminate that can improve visibility and can satisfactorily reduce the weight of VR goggles. The optical laminate has a polarizing member, a first phase difference member including a first [lambda] / 4 member, and an adhesive layer disposed between the polarizing member and the first phase difference member. In the optical laminate, the dimensional change rate of the polarizing member in the absorption axis direction is 0.50% or more, the first [lambda] / 4 member (20) is a liquid crystal alignment cured layer, and the elastic modulus of the adhesive layer at 85 DEG C is 0.07 MPa to 0.5 MPa.

Description

Technical Field

[0001] This invention relates to optical laminates and display systems. Background Technology

[0002] Image display devices, such as liquid crystal displays and electroluminescent (EL) displays (e.g., organic EL displays), are rapidly gaining popularity. In image display devices, optical components such as phase retardation components and polarization components are typically used to achieve image display and improve image display performance (e.g., see Patent Document 1). These optical components can be pre-integrated and mounted on the image display device as an optical laminate.

[0003] In recent years, new applications for image display devices have been developed. For example, goggles with displays (VR goggles) for realizing Virtual Reality (VR) have begun to be commercialized. Research is underway into the use of VR goggles in various scenarios, with hopes for improvements such as lighter weight and enhanced visual recognition.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2021-103286 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] The aforementioned reduction in the weight of VR goggles can be achieved, for example, by thinning the lenses used in VR goggles. On the other hand, it is also desirable to develop optical laminates that include the aforementioned optical components suitable for display systems using lenses.

[0009] In view of the above, the main objective of the present invention is to provide an optical laminate that can improve visual recognition and effectively achieve lightweight VR goggles.

[0010] Problem Solving Methods

[0011] 1. The optical laminate of the present invention is an optical laminate for a display method, the display method comprising: passing light of a display image emitted via a polarizing member through a first λ / 4 member; passing light passing through the first λ / 4 member through a semi-reflective mirror and a first lens portion; passing light passing through the semi-reflective mirror and the first lens portion through a second λ / 4 member; reflecting light passing through the second λ / 4 member toward the semi-reflective mirror using a reflective polarizing member; and using the second λ / 4 member to allow light reflected by the reflective polarizing member and the semi-reflective mirror to pass through the reflective polarizing member. The optical laminate comprises: the polarizing member; a first phase difference member including the first λ / 4 member; and an adhesive layer disposed between the polarizing member and the first phase difference member. In the optical laminate, the dimensional change rate of the polarizing member in the absorption axis direction is 0.50% or more, the first λ / 4 member is a liquid crystal alignment curing layer, and the adhesive layer has an elastic modulus of 0.07 MPa to 0.5 MPa at 85°C.

[0012] 2. The optical laminate according to 1 above, wherein the dimensional change rate of the polarizing member of the first phase difference member in the absorption axis direction can be 0.67% or less.

[0013] 3. The optical laminate according to 1 or 2 above, wherein the thickness of the first λ / 4 member can be less than 5 μm.

[0014] 4. The optical laminate according to any one of 1 to 3 above, wherein the first phase difference member may further include other phase difference layers.

[0015] 5. The optical laminate described in any one of 1 to 4 may further have a second phase difference member disposed between the polarizing member and the first phase difference member.

[0016] 6. The display system according to an embodiment of the present invention is a display system for displaying images to a user. The display system includes: a display element having a display surface from which light for displaying an image is emitted forward via a polarizing member; a reflective polarizing member disposed in front of the display element to reflect light emitted from the display element; a first lens portion disposed in the optical path between the display element and the reflective polarizing member; a semi-reflective mirror disposed between the display element and the first lens portion, allowing light emitted from the display element to pass through and causing light reflected by the reflective polarizing member to reflect towards the reflective polarizing member; and a first λ / 4 member disposed on the upper... The display system includes an optical stack comprising: the polarizing member, a first phase difference member including the first λ / 4 member, and an adhesive layer disposed between the polarizing member and the first phase difference member; wherein the polarizing member has a dimensional change rate of 0.50% or more in the absorption axis direction, the first λ / 4 member is a liquid crystal alignment curing layer, and the adhesive layer has an elastic modulus of 0.07 MPa to 0.5 MPa at 85°C.

[0017] 7. The optical laminate according to 6 above, wherein the dimensional change rate of the polarizing member of the first phase difference member in the absorption axis direction can be 0.67% or less.

[0018] 8. The display system according to 6 or 7 above, wherein the thickness of the first λ / 4 component can be less than 5 μm.

[0019] 9. The display system according to any one of 6 to 8 above, wherein the first phase difference member may further include other phase difference layers.

[0020] 10. The display system according to any one of 6 to 9 above, wherein the optical laminate may further have a second phase difference member disposed between the polarizing member and the first phase difference member.

[0021] 11. The display system according to any one of 6 to 10 above, wherein the absolute value of the difference between the in-plane phase difference (a) of the first λ / 4 member and the in-plane phase difference (b) of the second λ / 4 member can be 3.5 nm or less.

[0022] The effects of the invention

[0023] The optical laminate according to embodiments of the present invention can improve visual recognition and effectively achieve lightweight VR goggles. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating a simplified configuration of a display system according to one embodiment of the present invention.

[0025] Figure 2 This is a schematic cross-sectional view illustrating a simplified configuration of an optical laminate according to one embodiment of the present invention.

[0026] Figure 3 This is a diagram used to illustrate the method for measuring the rate of change of dimensions.

[0027] Symbol Explanation

[0028] 1 Optical laminate

[0029] 2 Display System

[0030] 12 display elements

[0031] 12a display surface

[0032] 13 Polarizing components

[0033] 13a polarizing film

[0034] 13b Protective layer

[0035] 14. Reflecting section (reflective polarizing component)

[0036] 16 First Lens Section

[0037] 18 Semi-reflective mirrors

[0038] 20 First λ / 4 component

[0039] 21 First phase difference component

[0040] 22 Second λ / 4 component

[0041] 23 Other phase difference layers

[0042] 24 Second Lens Section

[0043] 30 Protective components

[0044] 32 Second phase difference component

[0045] 41 First adhesive layer

[0046] 42 Second adhesive layer Detailed Implementation

[0047] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to these embodiments. For clarity, the drawings sometimes schematically show the width, thickness, shape, etc., of various parts compared to the embodiments, but these are merely examples and do not limit the interpretation of the present invention. Furthermore, regarding the drawings, sometimes the same or equivalent elements are labeled with the same symbols, and repeated descriptions are omitted.

[0048] (Definitions of terms and symbols)

[0049] The terms and symbols used in this manual are defined as follows.

[0050] (1) Refractive index (nx, ny, nz)

[0051] “nx” is the refractive index in the direction where the refractive index reaches its maximum in the plane (i.e., the slow axis direction), “ny” is the refractive index in the direction orthogonal to the slow axis in the plane (i.e., the fast axis direction), and “nz” is the refractive index in the thickness direction.

[0052] (2) In-plane phase difference (Re)

[0053] “Re(λ)” is the in-plane phase difference measured at 23°C with light of wavelength λnm. For example, “Re(550)” is the in-plane phase difference measured at 23°C with light of wavelength 550nm. When the thickness of the layer (film) is set as d (nm), Re(λ) can be obtained by the formula: Re(λ)=(nx-ny)×d.

[0054] (3) Phase difference (Rth) in the thickness direction

[0055] “Rth(λ)” is the phase difference in the thickness direction measured at 23°C using light with a wavelength of λnm. For example, “Rth(550)” is the phase difference in the thickness direction measured at 23°C using light with a wavelength of 550nm. When the thickness of the layer (film) is set as d (nm), Rth(λ) can be obtained using the formula: Rth(λ)=(nx-nz)×d.

[0056] (4) Nz coefficient

[0057] The coefficient of Nz can be obtained by Nz = Rth / Re.

[0058] (5) Angle

[0059] In this specification, when referring to angles, unless otherwise specified, the angle includes both clockwise and counterclockwise directions relative to a reference direction. Therefore, for example, "45°" means ±45°. Furthermore, in this specification, "generally parallel" includes a range of 0°±10°, preferably 0°±5°, more preferably 0°±3°, and even more preferably 0°±1°. "Generally orthogonal" includes a range of 90°±10°, preferably 90°±5°, more preferably 90°±3°, and even more preferably 90°±1°.

[0060] [Display System]

[0061] Figure 1 This is a schematic diagram illustrating a simplified configuration of a display system according to one embodiment of the present invention. Figure 1 The diagram schematically illustrates the configuration and shape of the various components of the display system 2. The display system 2 includes a display element 12, a reflective portion 14 including a reflective polarizing member, a first lens portion 16, a semi-reflective mirror 18, a first λ / 4 member 20, a second λ / 4 member 22, and a second lens portion 24. The reflective portion 14 is disposed on the display surface 12a side, i.e., in front of the display element 12, and is capable of reflecting light emitted from the display element 12. The first lens portion 16 is disposed in the optical path between the display element 12 and the reflective portion 14, and the semi-reflective mirror 18 is disposed between the display element 12 and the first lens portion 16. The first λ / 4 member 20 is disposed in the optical path between the display element 12 and the semi-reflective mirror 18, and the second λ / 4 member 22 is disposed in the optical path between the semi-reflective mirror 18 and the reflective portion 14.

[0062] The display element 12 is, for example, a liquid crystal display or an organic EL display, having a display surface 12a for displaying images. Light emitted from the display surface 12a passes through a polarizing member (typically a polarizing film) that may be included in the display element 12 and is then emitted as first linearly polarized light.

[0063] The first linearly polarized light incident on the first λ / 4 member 20 is converted into first circularly polarized light. The first λ / 4 member 20 can be integrally disposed on the display element 12. For example, the first λ / 4 member 20 can be integrally disposed with a polarizing member that may be included in the display element 12.

[0064] The semi-reflective mirror 18 allows light emitted from the display element 12 to pass through and causes light reflected in the reflective portion 14 to be reflected back towards the reflective portion 14. The semi-reflective mirror 18 is integrally provided with the first lens portion 16.

[0065] The second λ / 4 member 22 allows light reflected by the reflector 14 and the semi-reflector 18 to pass through the reflector 14, which includes a reflective polarizing member. The second λ / 4 member 22 can be integrally provided with the first lens 16.

[0066] The first circularly polarized light emitted from the first λ / 4 member 20 passes through the half-reflector 18 and the first lens section 16, and is converted into second linearly polarized light by the second λ / 4 member 22. The second linearly polarized light emitted from the second λ / 4 member 22 is reflected back to the half-reflector 18 without passing through the reflective polarizing member included in the reflecting section 14. At this time, the polarization direction of the second linearly polarized light incident on the reflective polarizing member included in the reflecting section 14 is the same as the reflection axis of the reflective polarizing member. Therefore, the second linearly polarized light incident on the reflecting section 14 is reflected by the reflective polarizing member.

[0067] The second linearly polarized light reflected by the reflecting section 14 is converted into second circularly polarized light by the second λ / 4 member 22. The second circularly polarized light emitted from the second λ / 4 member 22 passes through the first lens section 16 and is reflected by the half-reflecting mirror 18. The circularly polarized light reflected by the half-reflecting mirror 18 passes through the first lens section 16 and is converted into third linearly polarized light by the second λ / 4 member 22. The third linearly polarized light passes through the reflective polarizing member included in the reflecting section 14. At this time, the polarization direction of the third linearly polarized light incident on the reflective polarizing member included in the reflecting section 14 is the same as the transmission axis of the reflective polarizing member. Therefore, the third linearly polarized light incident on the reflecting section 14 can pass through the reflective polarizing member.

[0068] Light passing through the reflector 14 passes through the second lens 24 and enters the user's eye 26.

[0069] For example, the absorption axis of the polarizing member included in the display element 12 and the reflection axis of the reflective polarizing member included in the reflective portion 14 can be arranged substantially parallel to each other, or substantially orthogonal to each other. The angle between the absorption axis of the polarizing member included in the display element 12 and the slow axis of the first λ / 4 member 20 is, for example, 40° to 50°, 42° to 48°, or approximately 45°. The angle between the absorption axis of the polarizing member included in the display element 12 and the slow axis of the second λ / 4 member 22 is, for example, 40° to 50°, 42° to 48°, or approximately 45°.

[0070] The in-plane phase difference Re(550) of the first λ / 4 component 20 is, for example, 100nm~190nm, 110nm~180nm, 130nm~160nm, or 135nm~155nm.

[0071] The first λ / 4 element 20 preferably exhibits an inverse dispersion wavelength characteristic, where the phase difference increases with the wavelength of the measurement light. The Re(450) / Re(550) of the first λ / 4 element 20 is, for example, less than 1, and can be less than 0.95, further less than 0.90, and further less than 0.85. The Re(450) / Re(550) of the first λ / 4 element 20 is, for example, greater than 0.75.

[0072] In one embodiment, the first λ / 4 member 20 satisfies all the conditions Re(400) / Re(550) < 0.85, Re(650) / Re(550) > 1.03, and Re(750) / Re(550) > 1.05. The first λ / 4 member 20 preferably satisfies at least one of the following conditions, more preferably at least two, and even more preferably all of the following conditions: 0.65 < Re(400) / Re(550) < 0.80 (preferably 0.7 < Re(400) / Re(550) < 0.75), 1.0 < Re(650) / Re(550) < 1.25 (preferably 1.05 < Re(650) / Re(550) < 1.20), and 1.05 < Re(750) / Re(550) < 1.40 (preferably 1.08 < Re(750) / Re(550) < 1.36).

[0073] The first λ / 4 component 20 preferably exhibits a refractive index characteristic of nx > ny ≥ nz. Here, "ny = nz" includes not only the case where ny and nz are exactly equal, but also the case where they are substantially equal. Therefore, it can be the case where ny < nz without impairing the effect of the present invention. The Nz coefficient of the first λ / 4 component 20 is preferably 0.9 to 3, more preferably 0.9 to 2.5, even more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3.

[0074] The thickness of the first λ / 4 member 20 is, for example, 20 μm or less, preferably 10 μm or less, more preferably 8 μm or less, even more preferably 6 μm or less, particularly preferably 5 μm or less, and can be 4 μm or less. By satisfying such a thickness, the first λ / 4 member 20 has excellent smoothness, which helps to improve the visual recognition of the display system. The thickness of the first λ / 4 member 20 is, for example, 1 μm or more.

[0075] The first λ / 4 member 20 is preferably composed of an alignment-cured layer of a liquid crystal compound. By being composed of an alignment-cured layer of a liquid crystal compound, the aforementioned thickness can be achieved well. In addition, the uniformity of the in-plane phase difference value can be excellent. Specifically, compared with a stretched film of resin film, the uniformity of the in-plane phase difference value can be better.

[0076] The aforementioned orientation-cured layer of the liquid crystal compound is a layer in which the liquid crystal compound is oriented in a given direction and its orientation state is fixed. It should be noted that "orientation-cured layer" includes the concept of an orientation-cured layer obtained by curing liquid crystal monomers as described later. For the first λ / 4 member, typically, the rod-shaped liquid crystal compound is oriented (homogeneous alignment) in a state aligned along the slow axis direction of the first λ / 4 member. Examples of rod-shaped liquid crystal compounds include liquid crystal polymers and liquid crystal monomers. The liquid crystal compound is preferably capable of polymerization. If the liquid crystal compound is capable of polymerization, the orientation state of the liquid crystal compound can be fixed by polymerization after orientation.

[0077] The alignment-cured layer (liquid crystal alignment-cured layer) of the aforementioned liquid crystal compound can be formed by the following method: an alignment treatment is performed on the surface of a given substrate; a coating liquid containing the liquid crystal compound is applied to the surface; the liquid crystal compound is aligned along a direction corresponding to the alignment treatment; and the alignment state is fixed. Any suitable alignment treatment can be used. Examples include mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment. Specific examples of mechanical alignment treatment include friction treatment and stretching treatment. Specific examples of physical alignment treatment include magnetic field alignment treatment and electric field alignment treatment. Specific examples of chemical alignment treatment include tilting vapor deposition and photo-alignment treatment. The processing conditions for each alignment treatment can be any suitable condition depending on the purpose.

[0078] The orientation of a liquid crystal compound can be achieved by processing it at a temperature that displays a liquid crystal phase, depending on the type of liquid crystal compound. Through such temperature processing, the liquid crystal compound is in a liquid crystal state and is oriented in accordance with the orientation processing direction of the substrate surface.

[0079] In one embodiment, the orientation state is fixed by cooling the oriented liquid crystal compound as described above. If the liquid crystal compound is polymerizable or crosslinkable, the orientation state can be fixed by performing a polymerization or crosslinking treatment on the oriented liquid crystal compound as described above.

[0080] As the aforementioned liquid crystal compound, any suitable liquid crystal polymer and / or liquid crystal monomer can be used. The liquid crystal polymer and liquid crystal monomer can be used alone or in combination. Specific examples of liquid crystal compounds and methods for fabricating liquid crystal alignment fixing layers are described, for example, in Japanese Patent Application Publication No. 2006-163343, Japanese Patent Application Publication No. 2006-178389, and International Publication No. 2018 / 123551. The contents of these publications are incorporated herein by reference.

[0081] The in-plane phase difference Re(550) of the second λ / 4 component 22 is, for example, 100nm~190nm, 110nm~180nm, 130nm~160nm, or 135nm~155nm.

[0082] The second λ / 4 element 22 preferably exhibits an inverse dispersion wavelength characteristic, where the phase difference increases with the wavelength of the measurement light. The Re(450) / Re(550) ratio of the second λ / 4 element 22 is, for example, less than 1, and can be 0.95 or less, further less than 0.90, and further less than 0.85. The Re(450) / Re(550) ratio of the second λ / 4 element 22 is, for example, 0.75 or more.

[0083] In one embodiment, the second λ / 4 member 22 satisfies all the conditions Re(400) / Re(550) < 0.85, Re(650) / Re(550) > 1.03, and Re(750) / Re(550) > 1.05. The second λ / 4 member 22 preferably satisfies at least one of the following conditions, more preferably at least two, and even more preferably all of the following conditions: 0.65 < Re(400) / Re(550) < 0.80 (preferably 0.7 < Re(400) / Re(550) < 0.75), 1.0 < Re(650) / Re(550) < 1.25 (preferably 1.05 < Re(650) / Re(550) < 1.20), and 1.05 < Re(750) / Re(550) < 1.40 (preferably 1.08 < Re(750) / Re(550) < 1.36).

[0084] The second λ / 4 member 22 preferably exhibits a refractive index characteristic of nx > ny ≥ nz. Here, "ny = nz" includes not only the case where ny and nz are exactly equal, but also the case where they are substantially equal. Therefore, it can be the case where ny < nz without impairing the effect of the present invention. The Nz coefficient of the second λ / 4 member 22 is preferably 0.9 to 3, more preferably 0.9 to 2.5, even more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3.

[0085] The second λ / 4 member 22 is formed of any suitable material capable of satisfying the above-described characteristics. The second λ / 4 member 22 may be, for example, a stretched film of a resin film or an orientation-cured layer of a liquid crystal compound. The same description as that for the first λ / 4 member 20 applies to the second λ / 4 member 22, which is composed of an orientation-cured layer of a liquid crystal compound.

[0086] Examples of resins included in the aforementioned resin films include: polycarbonate resins, polyester carbonate resins, polyester resins, polyvinyl acetal resins, polyarylate resins, cyclic olefin resins, cellulose resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, and acrylic resins. These resins can be used alone or in combination. Examples of methods of combination include blending and copolymerization. When the phase retardation component exhibits inverse dispersion wavelength characteristics, resin films containing polycarbonate resins or polyester carbonate resins (hereinafter sometimes simply referred to as polycarbonate resins) can be suitably used.

[0087] As the aforementioned polycarbonate resin, any suitable polycarbonate resin can be used. For example, the polycarbonate resin comprises structural units derived from fluorene dihydroxy compounds, structural units derived from isosorbide dihydroxy compounds, and structural units derived from at least one dihydroxy compound selected from alicyclic diols, alicyclic diethanols, di-, tri-, or polyethylene glycols, and alkylene diols or spirodiols. Preferably, the polycarbonate resin comprises structural units derived from fluorene dihydroxy compounds, structural units derived from isosorbide dihydroxy compounds, and structural units derived from alicyclic diethanols and / or structural units derived from di-, tri-, or polyethylene glycols; more preferably, it comprises structural units derived from fluorene dihydroxy compounds, structural units derived from isosorbide dihydroxy compounds, and structural units derived from di-, tri-, or polyethylene glycols. The polycarbonate resin may also, as needed, comprise structural units derived from other dihydroxy compounds. It should be noted that details of the polycarbonate resins suitable for use in phase retardation components and the methods for forming phase retardation components are described, for example, in Japanese Patent Application Publication Nos. 2014-10291, 2014-26266, 2015-212816, 2015-212817, and 2015-212818, and the descriptions in these publications are incorporated herein by reference.

[0088] The thickness of the second λ / 4 member 22 is preferably 100 μm or less. Specifically, the thickness of the second λ / 4 member 22, which is a stretched film of resin film, is, for example, 10 μm to 100 μm, preferably 10 μm to 70 μm, more preferably 10 μm to 60 μm, and even more preferably 20 μm to 50 μm.

[0089] The first λ / 4 component 20 and the second λ / 4 component 22 can be components with the same structure (forming material, thickness, optical properties, etc.) or components with different structures.

[0090] In display system 2, for example, from the viewpoint of improving visual recognition, the phase difference value of the first λ / 4 member 20 and the phase difference value of the second λ / 4 member 22 may require a high degree of adjustment. For example, the absolute value of the difference between the in-plane phase difference (a) of the first λ / 4 member 20 and the in-plane phase difference (b) of the second λ / 4 member 22 is, for example, 3.5 nm or less, preferably 3.0 nm or less, more preferably 2.5 nm or less, further preferably 2.0 nm or less, particularly preferably 1.5 nm or less, and most preferably 1.0 nm or less. (a) and (b) are, for example, values ​​of Re(590).

[0091] In addition, for example, the in-plane phase difference (a) of the first λ / 4 member 20 and the in-plane phase difference (b) of the second λ / 4 member 22 preferably satisfy the following equation (I).

[0092] ((a)-(b)) / ((a)+(b) / 2)≤0.02···(I)

[0093] More preferably, ((a)-(b)) / ((a)+(b) / 2)≤0.015, and even more preferably, ((a)-(b)) / ((a)+(b) / 2)≤0.01.

[0094] The aforementioned reflective polarizing member allows polarized light parallel to its transmission axis (typically linearly polarized light) to pass through while maintaining its polarization state, and reflects light with other polarization states. The orthogonal transmittance (Tc) of the reflective polarizing member can, for example, be 0.01% to 3%. The unit transmittance (Ts) of the reflective polarizing member can, for example, be 43% to 49%, preferably 45% to 47%. The degree of polarization (P) of the reflective polarizing member can, for example, be 92% to 99.99%. The reflective polarizing member is typically composed of a film with a multilayer structure (sometimes called a reflective polarizing film). Commercially available reflective polarizing films include, for example, those manufactured by 3M under the trade names "DBEF" and "APF," and those manufactured by Nitto Denko Corporation under the trade name "APCF."

[0095] As described above, the first λ / 4 component 20 can be integrally disposed with the polarizing component that may be included in the display element 12. In this case, it is preferable to form an optical laminate that integrates the polarizing component that may be included in the display element 12 with the first λ / 4 component 20.

[0096] [Optical laminate]

[0097] Figure 2 This is a schematic cross-sectional view illustrating a simplified configuration of an optical laminate according to one embodiment of the present invention. The optical laminate 1 includes: a polarizing member 13 that may be included in a display element 12, and a [missing information - likely a component or element] disposed on one side (front side) of the polarizing member 13. Figure 2The first phase difference component 21 (located on the upper side).

[0098] The polarizing component 13 includes at least a polarizing film 13a. Figure 2 In the example shown, the polarizing member 13 includes a protective layer 13b in addition to the polarizing film 13a. The polarizing member 13 has a stacked structure of the polarizing film 13a and the protective layer 13b. The polarizing film 13a and the protective layer 13b are stacked together, for example, via an adhesive layer not shown in the figure. In this case, the polarizing member 13 sequentially includes the polarizing film 13a, the adhesive layer, and the protective layer 13b. Figure 2 In the example shown, the protective layer 13b is only provided on one side of the polarizing film 13a, but it can also be provided on both sides, for example.

[0099] The polarizing film 13a is typically an absorption-type polarizing film and can be composed of a resin film containing a dichroic substance. The thickness of the polarizing film 13a is, for example, 1 μm or more and 20 μm or less, 2 μm or more and 15 μm or less, 12 μm or less, 10 μm or less, or 8 μm or less. The thickness of the polarizing member 13 is, for example, 10 μm or more, or 20 μm or more. The thickness of the polarizing member 13 is, for example, 100 μm or less, or 80 μm or less.

[0100] The aforementioned absorptive polarizing film can be made from a single layer of resin film or from a laminate of two or more layers.

[0101] In the case of a single-layer resin film, for example, an absorptive polarizing film can be obtained by subjecting hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formaldehyde-treated PVA films, and partially saponified ethylene-vinyl acetate copolymer films to dyeing treatments using dichroic substances such as iodine and dichroic dyes, and stretching treatments. Among these, an absorptive polarizing film obtained by dyeing a PVA film with iodine and then uniaxially stretching it is preferred.

[0102] The above-mentioned dyeing using iodine can be carried out, for example, by immersing the PVA film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching can be performed after dyeing or during dyeing. Alternatively, dyeing can be performed after stretching. Swelling treatment, crosslinking treatment, cleaning treatment, drying treatment, etc., can be applied to the PVA film as needed.

[0103] Examples of laminates made using two or more layers include a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a resin substrate and a PVA-based resin layer coated on the resin substrate. An absorptive polarizing film obtained using a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate can be manufactured by: for example, coating a PVA-based resin solution onto a resin substrate, drying it to form a PVA-based resin layer on the resin substrate, obtaining a laminate of the resin substrate and the PVA-based resin layer; stretching and dyeing the laminate to form an absorptive polarizing film from the PVA-based resin layer. In this embodiment, it is preferable to form a polyvinyl alcohol resin layer comprising a halide and a polyvinyl alcohol resin on one side of the resin substrate. Stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching. Furthermore, stretching may, as needed, further include stretching the laminate in a gas atmosphere at a high temperature (e.g., 95°C or higher) before stretching in the aqueous boric acid solution. Furthermore, in this embodiment, it is preferable to subject the laminate to a drying shrinkage treatment, which causes it to shrink by more than 2% in the width direction by heating while being transported along the length direction. Typically, the manufacturing method of this embodiment includes sequentially subjecting the laminate to assisted stretching in a gas atmosphere, dyeing, stretching in an aqueous solution, and drying shrinkage treatment. By introducing assisted stretching, even when PVA is coated on a thermoplastic resin substrate, the crystallinity of PVA can be improved, achieving high optical properties. Additionally, by simultaneously improving the orientation of PVA beforehand, problems such as decreased orientation and dissolution of PVA during subsequent dyeing and stretching processes when immersed in water can be prevented, achieving high optical properties. Furthermore, when the PVA-type resin layer is immersed in a liquid, compared to when the PVA-type resin layer does not contain halides, the orientation disorder of polyvinyl alcohol molecules and the reduction of orientation can be suppressed. Therefore, the optical properties of the absorptive polarizing film obtained by immersing the laminate in a liquid through dyeing and stretching processes in an aqueous solution can be improved. Furthermore, by drying and shrinking the laminate in the width direction, optical properties can be improved. The resulting resin substrate / absorbent polarizing film laminate can be used directly (i.e., the resin substrate can be used as a protective layer for the absorbent polarizing film), or the resin substrate can be peeled off from the resin substrate / absorbent polarizing film laminate, and any suitable protective layer corresponding to the purpose can be laminated on the peeled surface or on the side opposite to the peeled surface. Detailed descriptions of such a method for manufacturing an absorbent polarizing film are described, for example, in Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire contents of these publications are incorporated herein by reference.

[0104] The orthogonal transmittance (Tc) of the polarizing element (absorption-type polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and even more preferably 0.05% or less. The unit transmittance (Ts) of the polarizing element (absorption-type polarizing film) is, for example, 41.0% to 45.0%, preferably 42.0% or more. The degree of polarization (P) of the polarizing element (absorption-type polarizing film) is, for example, 99.0% to 99.997%, preferably 99.9% or more.

[0105] The aforementioned orthogonal transmittance, monomer transmittance, and degree of polarization can be measured, for example, using a UV-Vis spectrophotometer. The degree of polarization P can be determined using a UV-Vis spectrophotometer by measuring monomer transmittance Ts, parallel transmittance Tp, and orthogonal transmittance Tc, and then calculated from the obtained Tp and Tc using the following formula. It should be noted that Ts, Tp, and Tc are Y values ​​obtained by measuring with a 2-degree field of view (C light source) using JIS Z8701 and undergoing visibility correction.

[0106] Degree of polarization P(%)={(Tp-Tc) / (Tp+Tc)} 1 / 2 ×100

[0107] The protective layer 13b, which may be included in the polarizing member 13, can be made of any suitable film, for example. Materials that form the main component of the film constituting the protective layer include, for example, cellulose resins such as cellulose triacetate (TAC), polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, polyethersulfones, polysulfones, polystyrene, cycloolefins such as polynorbornene, polyolefins, (meth)acrylic acids, acetates, etc. Here, (meth)acrylic acid refers to acrylic acid and / or methacrylic acid.

[0108] The thickness of the protective layer 13b is preferably 5 μm to 80 μm, more preferably 10 μm to 50 μm, and even more preferably 15 μm to 40 μm.

[0109] The first phase difference member 21 includes at least a first λ / 4 member 20. Figure 2 In the example shown, the first retardation member 21 includes other retardation layers 23 besides the first λ / 4 member 20. These other retardation layers 23 are constructed from, for example, members capable of exhibiting a refractive index characteristic of nz > nx = ny (so-called positive C-plates). The first retardation member 21 has a stacked structure of the first λ / 4 member 20 and the other retardation layers 23. The first λ / 4 member 20 and the other retardation layers 23 are stacked together, for example, via an adhesive layer not shown in the figure. In this case, the first retardation member 21 includes the first λ / 4 member 20, the adhesive layer, and the other retardation layers 23. When the other retardation layers 23 are constructed from positive C-plates, as... Figure 2As shown, in the first phase difference member 21, the other phase difference layers (positive C plate) 23 are preferably located further forward than the first λ / 4 member 20.

[0110] The phase difference Rth(550) in the thickness direction of the aforementioned positive C-plate is preferably -50nm to -300nm, more preferably -70nm to -250nm, even more preferably -90nm to -200nm, and particularly preferably -100nm to -180nm. Here, "nx = ny" includes not only the case where nx and ny are strictly equal, but also the case where nx and ny are substantially equal. The in-plane phase difference Re(550) of the positive C-plate is, for example, less than 10nm.

[0111] The positive C-plate can be formed from any suitable material, but it is preferably composed of a film containing a liquid crystal material fixed in a vertical orientation. The liquid crystal material (liquid crystal compound) capable of vertical orientation can be a liquid crystal monomer or a liquid crystal polymer. Specific examples of such a liquid crystal compound and a method for forming the positive C-plate include the liquid crystal compound and the method for forming the phase retardation layer described in Japanese Patent Application Publication Nos. 2002-333642

[0020] to

[0028] . In this case, the thickness of the positive C-plate is preferably 0.5 μm to 5 μm.

[0112] The optical laminate 1 may contain any other phase difference components with suitable refractive index characteristics. Figure 2 In the example shown, the optical laminate 1 has a second phase difference member 32 disposed between the polarizing member 13 and the first phase difference member 21. The second phase difference member 32 is laminated to the polarizing film 13a, for example, via an adhesive layer not shown in the figure, and functions as a protective layer for the polarizing film 13a.

[0113] The second phase difference member 32 is provided, for example, from the viewpoint that the optical axis relationship between the compensation polarization member 13 and the aforementioned reflective polarization member shifts with the change in field of view. In this case, the second phase difference member 32 may include at least one optical compensation layer having a slow axis. The optical compensation layer having a slow axis (hereinafter referred to as the first optical compensation layer) may be arranged such that its slow axis is substantially orthogonal or substantially parallel to the absorption axis of the polarization member 13. With this configuration, light emitted from the display element 12 as first linearly polarized light can pass through the second phase difference member 32 without substantially changing its polarization state. It should be noted that in this specification, "optical compensation layer having a slow axis" refers to an optical compensation layer with a Re(550) of 10 nm or more.

[0114] In one embodiment, the first optical compensation layer is a layer exhibiting a refractive index characteristic of nx > ny > nz (a so-called negative B-plate). In this case, it is preferable that the second phase retardation member 32 includes a second optical compensation layer in addition to the first optical compensation layer. The second optical compensation layer is, for example, a layer exhibiting a refractive index characteristic of nz > nx > ny (a so-called positive B-plate), and the second phase retardation member 32 may have a stacked structure in which the first optical compensation layer and the second optical compensation layer are stacked sequentially from the polarizing member 13 side. The first optical compensation layer and the second optical compensation layer can typically be stacked via an adhesive layer. Specifically, it may sequentially include a first optical compensation layer, an adhesive layer, and a second optical compensation layer. Moreover, the slow axis of the first optical compensation layer and the slow axis of the second optical compensation layer can be arranged in a manner that is substantially orthogonal to the absorption axis of the polarizing member 13.

[0115] In another embodiment, the first optical compensation layer described above is a component exhibiting a refractive index characteristic of nx > nz > ny (a so-called Z-plate). Specifically, the second phase difference component 32 can be constructed from a Z-plate. Here, the slow axis of the optical compensation layer can be configured to be substantially orthogonal or substantially parallel to the absorption axis of the polarization component 13.

[0116] The thickness of the second phase difference member 32 varies depending on its configuration, for example, it is less than 200 μm, preferably 5 μm to 170 μm, and more preferably 10 μm to 150 μm.

[0117] The in-plane phase difference Re(550) of the aforementioned negative B-plate is, for example, 60 nm to 190 nm, preferably 80 nm to 170 nm, and more preferably 100 nm to 150 nm. The phase difference Rth(550) in the thickness direction of the negative B-plate is, for example, 60 nm to 200 nm, preferably 80 nm to 180 nm, and more preferably 100 nm to 160 nm. The Nz coefficient of the negative B-plate is, for example, 1.1 to 3.0, preferably 1.1 to 2.7. The negative B-plate can exhibit inverse dispersion wavelength characteristics, positive wavelength dispersion characteristics, or flat wavelength dispersion characteristics.

[0118] The negative B plate can be made of any suitable material that satisfies the above-mentioned characteristics. For example, the negative B plate is made of a stretched film of a resin film. Examples of resins included in the resin film include: cycloolefin resins (e.g., norbornene resins), polycarbonate resins, cellulose resins, polyvinyl alcohol resins, polysulfone resins, etc. Such resins can be used alone or in combination. The resin film preferably includes norbornene resins and / or cellulose resins. Details regarding these resins and the stretching methods of the resin film are described, for example, in Japanese Patent Application Publication No. 2018-205485, etc. These publications are incorporated herein by reference.

[0119] The thickness of the negative B plate is, for example, 10μm~80μm, or, for example, 15μm~60μm.

[0120] The in-plane phase difference Re(550) of the aforementioned positive B-plate is, for example, 10 nm to 60 nm, preferably 15 nm to 55 nm, and more preferably 20 nm to 45 nm. The phase difference Rth(550) in the thickness direction of the positive B-plate is, for example, -250 nm to -10 nm, preferably -200 nm to -20 nm, and more preferably -150 nm to -60 nm. The Nz coefficient of the positive B-plate is, for example, -4.0 to -1.0, preferably -3.5 to -1.5, and more preferably -3.0 to -2.0. The positive B-plate can exhibit inverse dispersion wavelength characteristics, positive wavelength dispersion characteristics, or flat wavelength dispersion characteristics.

[0121] The positive B-plate can be made of any suitable material that satisfies the above-mentioned characteristics. The positive B-plate is made of, for example, a stretched film of resin. Thermoplastic resins are an example of resins constituting the positive B-plate, and polymers exhibiting negative intrinsic birefringence are preferably used. Polymers exhibiting negative intrinsic birefringence and polymers exhibiting positive intrinsic birefringence can also be used in combination. By using a polymer exhibiting negative intrinsic birefringence, a phase difference member exhibiting refractive index characteristics of nz > nx > ny and excellent uniformity in the slow axis direction can be easily obtained. Here, "exhibiting negative intrinsic birefringence" means that when the polymer is oriented by stretching or the like, the refractive index in the stretching direction decreases relatively. In other words, it means that the refractive index in the direction orthogonal to the stretching direction increases.

[0122] Polymers exhibiting inherent negative birefringence include, for example, polymers with highly polarimetric chemical bonds and functional groups such as aromatic rings and carbonyl groups introduced into their side chains. Specific examples include acrylic resins, styrene resins, maleimide resins, and fumarate resins, with styrene resins and fumarate resins being preferred. These can be used alone or in combination of two or more.

[0123] Preferred examples of the above-mentioned styrene-based resins include: styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer, styrene-(meth)acrylate copolymer, styrene-maleimide copolymer, vinyl ester-maleimide copolymer, and olefin-maleimide copolymer.

[0124] As a fumarate resin, fumarate-(meth)acrylate copolymer is a preferred example.

[0125] As a polymer exhibiting inherent negative birefringence, a polymer having repeating units as shown in the general formula (I) is preferably exemplified. Such a polymer exhibits higher negative birefringence and excellent heat resistance and mechanical strength. Such a polymer can be obtained, for example, by using an N-phenyl-substituted maleimide with an N-substituent of a maleimide monomer having a phenyl group having a substituent at least in the ortho position as a starting material.

[0126] [Chemical Formula 1]

[0127]

[0128] In the above general formula (I), R1 to R5 each independently represent hydrogen, halogen atom, carboxylic acid, carboxylic acid ester, hydroxyl, nitro group or straight-chain or branched alkyl or alkoxy group with 1 to 8 carbon atoms (wherein R1 and R5 are not hydrogen atoms at the same time), R6 and R7 represent hydrogen or straight-chain or branched alkyl or alkoxy group with 1 to 8 carbon atoms, and n represents an integer of 2 or more.

[0129] The positive B plate can be obtained by stretching a resin film containing the above-mentioned resin under any suitable stretching conditions.

[0130] The thickness of the positive B plate is, for example, 1μm to 30μm, preferably 2μm to 20μm, and more preferably 3μm to 10μm.

[0131] The in-plane phase difference Re(550) of the Z-plate is, for example, 200 nm to 350 nm, preferably 230 nm to 320 nm, and more preferably 250 nm to 300 nm. The Nz coefficient of the Z-plate is, for example, 0.2 to 0.8, preferably 0.3 to 0.7, and more preferably 0.4 to 0.6. The Z-plate can exhibit inverse dispersion wavelength characteristics, positive wavelength dispersion characteristics, or flat wavelength dispersion characteristics.

[0132] The Z-plate can be made of any suitable material that satisfies the above-mentioned characteristics. For example, the Z-plate can be made of a resin film. Examples of resins constituting the Z-plate include: aryl ester resins, polyamide resins, polyimide resins, polyester resins, polyaryl ether ketone resins, polyamide-imide resins, polyester-imide resins, polyvinyl alcohol resins, polyfurate ester resins, polyethersulfone resins, polysulfone resins, cycloolefin resins, polycarbonate resins, cellulose resins, and polyurethane resins. These resins can be used alone or in combination.

[0133] As the resin constituting the Z-plate, cyclic olefin resins are preferred, and norbornene resins are more preferred. Specifically, as a norbornene resin, the "cyclic olefin resin obtained by hydrogenating a ring-opening polymer of a norbornene monomer" disclosed in Japanese Patent Application Publication No. 2006-208925 can be cited.

[0134] Z-plates can be manufactured, for example, by laminating a high-shrinkage film (e.g., a polypropylene film) to both sides of a polymer film primarily composed of the aforementioned resin, and then heating and stretching it using a roller stretching machine via a longitudinal unidirectional stretching method. The high-shrinkage film can be used to impart a shrinkage force orthogonal to the stretching direction during heating and stretching, thereby increasing the refractive index (nz) in the thickness direction of the Z-plate. There are no particular limitations on the method of laminating the high-shrinkage film to both sides of the polymer film; for example, a method of bonding the polymer film and the high-shrinkage film by providing an acrylic adhesive layer based on an acrylic polymer.

[0135] The thickness of the Z-plate is, for example, 20μm~200μm, or, for example, 30μm~150μm.

[0136] A first adhesive layer 41 is disposed between the polarizing member 13 and the first phase difference member 21. The first adhesive layer 41 is disposed adjacent to the first phase difference member 21. The first phase difference member 21 is attached to the laminated portion containing the polarizing member 13 via the first adhesive layer 41.

[0137] The optical laminate 1 further includes a protective member 30 disposed in front of the first phase retardation member 21. The protective member 30 is laminated to the first phase retardation member 21 via a second adhesive layer 42. In the display system 2, a space is typically formed between the optical laminate 1 and the first lens portion 16. The protective member 30 can be located on the outermost surface of the optical laminate 1, capable of protecting the portion disposed behind (in front of) the first lens portion 16. Figure 2 The component is located on the lower side (in the middle).

[0138] Typically, the protective member 30 includes a substrate. The thickness of the substrate is preferably 5 μm to 80 μm, more preferably 10 μm to 50 μm, and even more preferably 15 μm to 40 μm. The substrate can be composed of any suitable film. Examples of materials that form the main component of the film constituting the substrate include: cellulose resins such as cellulose triacetate (TAC), polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, polyethersulfones, polysulfones, polystyrene, polynorbornene and other cyclic olefins, polyolefins, (meth)acrylic acids, acetates, and the like.

[0139] The protective member 30 preferably has a substrate and a surface treatment layer formed on the substrate. The protective member 30 with the surface treatment layer can be configured such that the surface treatment layer is located on the front side. Specifically, the surface treatment layer can be located on the outermost surface of the optical laminate 1. The surface treatment layer can have any suitable function. For example, from the viewpoint of improving visual recognition, the surface treatment layer preferably has an anti-reflective function. The thickness of the surface treatment layer is preferably 0.5 μm to 10 μm, more preferably 1 μm to 7 μm, and even more preferably 2 μm to 5 μm.

[0140] Although not shown in the figure, the optical laminate 1 may include a third phase difference member that may be included in the display element 12. The third phase difference member may be disposed behind the polarizing member 13. The third phase difference member may be laminated to the polarizing member 13, for example, via an adhesive layer. The third phase difference member may be, for example, a λ / 4 member (hereinafter referred to as the third λ / 4 member). The same description as that for the second λ / 4 member 22 applies to the third λ / 4 member. The angle between the absorption axis of the polarizing member 13 and the slow axis of the third phase difference member (third λ / 4 member) is, for example, 40° to 50°, 42° to 48°, or approximately 45°. In the case that the display element 12 is an organic EL display, by providing the third λ / 4 member together with the polarizing member 13, problems such as external light reflection and background reflection caused by the metal layer that may be included in the organic EL display can be eliminated. In addition, the problem of reflection caused by light leakage from the display element 12 in the display system 2 can also be eliminated.

[0141] In the optical laminate 1, the adhesive layer used for laminating the various components (layers) can be formed by an adhesive or a binder. Specifically, the adhesive layer can be either an adhesive layer or a binder layer. The thickness of the adhesive layer is, for example, 0.01 μm to 60 μm.

[0142] The polarizing film 13a included in the polarizing member 13 tends to shrink easily due to heating, etc. In particular, it tends to shrink easily along the absorption axis direction (e.g., the stretching direction in the fabrication process of the polarizing film 13a). In the optical laminate 1, the dimensional change rate of the polarizing member 13 in the absorption axis direction is, for example, 0.50% or more. Since the polarizing member 13 can be included in the display element 12, it is easily affected by the heat of the display element 12. In the optical laminate 1, the dimensional change rate of the polarizing member 13 in the absorption axis direction is preferably 0.70% or less, more preferably 0.67% or less, even more preferably 0.65% or less, and particularly preferably 0.63% or less. With such a dimensional change rate, the influence on other components included in the optical laminate can be well suppressed. It should be noted that the absorption axis direction of the polarizing member 13 corresponds to the absorption axis direction of the polarizing film 13a.

[0143] The component integrated with the polarizing member 13 is affected by the shrinkage of the polarizing member 13. As described above, in the display system 2, the phase difference value of the first λ / 4 component 20 and the phase difference value of the second λ / 4 component 22 may require high adjustment, wherein the phase difference value of the first λ / 4 component 20 may change due to the shrinkage of the polarizing member 13. By providing a first adhesive layer 41 between the polarizing member 13 and the first λ / 4 component 20 (first phase difference component 21), the effect of the shrinkage of the polarizing member 13 on the first λ / 4 component 20 can be reduced (e.g., dimensional changes can be suppressed), and changes in the phase difference value of the first λ / 4 component 20 can be suppressed.

[0144] In the optical laminate 1, the dimensional change rate of the polarizing member 13 of the first phase difference member 21 in the absorption axis direction is, for example, 0.40% or more. Even if the dimensional change rate of the first λ / 4 member 20, which is composed of a liquid crystal alignment curing layer, is small, its phase difference value may change significantly. In the optical laminate 1, the dimensional change rate of the polarizing member 13 of the first phase difference member 21 in the absorption axis direction is preferably 0.67% or less, more preferably 0.65% or less, even more preferably 0.63% or less, and particularly preferably 0.60% or less. With such a dimensional change rate, changes in the phase difference value can be well suppressed.

[0145] In addition, by providing a first adhesive layer 41 between the polarizing member 13 and the first λ / 4 member 20 (first phase difference member 21), the effect of the shrinkage of the polarizing member 13 can be reduced. For example, the size change of the second phase difference member 32 and / or the third phase difference member can be suppressed.

[0146] The aforementioned rate of dimensional change can be determined, for example, by placing the test sample in a heating environment of 85°C and 85% relative humidity for 120 hours and measuring the dimensional changes before and after heating.

[0147] The first adhesive layer 41 can be composed of any suitable adhesive. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives. By adjusting the type, quantity, combination, and proportion of monomers in the base resin forming the adhesive, as well as the amount of crosslinking agent, reaction temperature, and reaction time, an adhesive with desired properties corresponding to the target can be prepared. The base resin of the adhesive can be used alone or in combination of two or more. Acrylic resins are preferably used as the base resin. Specifically, the adhesive layer is preferably composed of an acrylic adhesive.

[0148] The elastic modulus of the first adhesive layer 41 at 85°C is preferably 0.07 MPa to 0.5 MPa, more preferably 0.1 MPa to 0.3 MPa.

[0149] The thickness of the first adhesive layer 41 is preferably 3 μm or more. On the other hand, the thickness of the first adhesive layer 41 is preferably 25 μm or less, but can be 20 μm or less, 15 μm or less, 10 μm or less, or 7 μm or less. With such a thickness, excellent smoothness can be achieved.

[0150] The optical laminate 1 can be formed as a single sheet. Typically, the top view shape of the optical laminate 1 can be rectangular, rounded rectangle, etc. In one embodiment, the long side of the optical laminate 1 is along the absorption axis of the polarizing member 13, and the short side of the optical laminate 1 is along the transmission axis of the polarizing member 13.

[0151] Example

[0152] The present invention will now be described in detail with reference to specific embodiments, but the present invention is not limited to these embodiments in any way. It should be noted that the testing and evaluation methods in the embodiments, etc., are as follows. Wherein, when "parts" are used, unless otherwise specified, it means "parts by weight"; when "%" are used, unless otherwise specified, it means "% by weight".

[0153] (1) Thickness

[0154] Thicknesses below 10 μm were measured using a scanning electron microscope (manufactured by Nippon Electron Ltd., product name "JSM-7100F"). Thicknesses exceeding 10 μm were measured using a digital micrometer (manufactured by Anritsu Ltd., product name "KC-351C").

[0155] (2) Phase difference

[0156] The phase difference at a given wavelength was measured using a phase difference / elliptic polarization measurement device (manufactured by Oji Measurement Equipment Co., Ltd., product name "KOBRA-HBR", "KOBRA-HBPR") at 23°C.

[0157] (3) Individual transmittance and degree of polarization of polarizing components

[0158] The individual transmittance Ts, parallel transmittance Tp, and orthogonal transmittance Tc of the polarizing element were measured using a spectrophotometer (manufactured by Otsuka Electronics Co., Ltd., "LPF-200"). These Ts, Tp, and Tc values ​​were Y values ​​measured using a 2-degree field of view (C light source) with JIS Z8701 and corrected for visibility. Based on the obtained Tp and Tc, the degree of polarization of the polarizing element was calculated using the following formula.

[0159] Degree of polarization (%) = {(Tp-Tc) / (Tp+Tc)} 1 / 2 ×100

[0160] (4) Elastic modulus

[0161] The test object (e.g., adhesive layer) was formed to a thickness of 2 mm by lamination. This formed material was then punched into a disc shape with a diameter of 7.9 mm to create a test piece. The test piece was clamped between parallel plates, and dynamic viscoelasticity was measured using a dynamic viscoelasticity measuring device (Advanced Rheometric Expansion System (ARES) manufactured by RheometricScientific) under the following conditions to determine the storage modulus of elasticity at 85°C.

[0162] (Measurement conditions)

[0163] • Transformation mode: Twist

[0164] • Measurement frequency: 1Hz

[0165] • Measurement temperature: -40℃ to +150℃

[0166] • Heating rate: 5℃ / minute

[0167] [Manufacturing Example 1]

[0168] (Fabrication of Absorption-Type Polarizing Film)

[0169] As a thermoplastic resin substrate, a strip-shaped amorphous polyethylene terephthalate copolymer film (thickness: 100 μm) with a Tg of about 75 °C was used to apply corona treatment to one side of the resin substrate.

[0170] A PVA aqueous solution (coating solution) was prepared by adding 13 parts by weight of potassium iodide to 100 parts by weight of a PVA resin prepared by mixing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetyl-modified PVA (manufactured by Mitsubishi Chemical Corporation, trade name "GOHSENX Z410") in a 9:1 ratio, and dissolving the resulting mixture in water.

[0171] The above-mentioned PVA aqueous solution was coated on the corona-treated surface of the resin substrate and dried at 60°C, thereby forming a PVA resin layer with a thickness of 13 μm and producing a laminate.

[0172] The resulting laminate was stretched unidirectionally along the longitudinal direction (length direction) to 2.4 times in an oven at 130°C (assisted stretching treatment in a gas atmosphere).

[0173] Next, the laminate is immersed in an insoluble bath (an aqueous solution of boric acid prepared by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40°C for 30 seconds (insoluble treatment).

[0174] Next, for the laminate, in order to achieve the desired monomer transmittance (Ts) of the final absorptive polarizing film, the concentration was adjusted while immersing it in a staining bath (an iodine aqueous solution prepared by mixing iodine and potassium iodide in a weight ratio of 1:7 relative to 100 parts by weight of water) at a liquid temperature of 30°C for 60 seconds (staining treatment).

[0175] Next, the laminate was immersed in a crosslinking bath (an aqueous solution of boric acid prepared by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40°C for 30 seconds (crosslinking treatment).

[0176] Then, while immersing the laminate in a boric acid aqueous solution (boric acid concentration 4 wt%, potassium iodide concentration 5 wt%) at a liquid temperature of 70°C, it is unidirectionally stretched (stretching treatment in aqueous solution) between rollers with different circumferential speeds along the longitudinal direction (length direction) to achieve a total stretch ratio of 5.5.

[0177] Then, the laminate was immersed in a cleaning bath at a liquid temperature of 20°C (an aqueous solution of 100 parts by weight of water and 4 parts by weight of potassium iodide) (cleaning treatment).

[0178] Then, while drying in an oven maintained at approximately 90°C, the laminate is subjected to drying on SUS heated rollers with the contact surface temperature maintained at approximately 75°C (drying shrinkage treatment). The width-direction shrinkage rate of the laminate based on the drying shrinkage treatment is 5.2%.

[0179] Thus, an absorptive polarizing film with a thickness of approximately 5 μm was formed on the resin substrate.

[0180] (Fabrication of polarization components)

[0181] An acrylic film with a lactone ring structure, 40 μm thick, was bonded to the surface of an absorptive polarizing film (the side opposite to the resin substrate) as a protective layer using a UV-curable adhesive. Specifically, the adhesive was applied to a thickness of 2 μm and then bonded using a roller press. UV light was then irradiated from the acrylic film side to cure the adhesive. The resin substrate was then peeled off. This yielded a polarizing member consisting of an acrylic film and an absorptive polarizing film. The polarizing member had a monomer transmittance (Ts) of 43.4% and a polarization degree of 99.993%.

[0182] [Manufacturing Example 2]

[0183] (Formation of λ / 4 components)

[0184] 55 parts of the compound shown in formula (I), 25 parts of the compound shown in formula (II), and 20 parts of the compound shown in formula (III) were added to 400 parts of cyclopentanone (CPN). The mixture was then heated to 60°C and stirred until dissolved. After confirming dissolution, the mixture was allowed to return to room temperature. 3 parts of Irgacure 907 (manufactured by BASF Japan), 0.2 parts of MEGAFACE F-554 (manufactured by DIC), and 0.1 parts of p-methoxyphenol (MEHQ) were added, and the mixture was stirred further to obtain a solution. The solution was clear and homogeneous. The obtained solution was filtered through a 0.20 μm membrane filter to obtain a polymerizable composition.

[0185] An alignment film was coated with a polyimide solution onto a 0.7 mm thick glass substrate using spin coating. After drying at 100°C for 10 minutes, it was fired at 200°C for 60 minutes to obtain the coating film. The obtained coating film was then subjected to friction treatment using a commercially available friction device to form an alignment film. The obtained polymeric composition was then coated onto the alignment film (substrate) using spin coating and dried at 100°C for 2 minutes. After cooling the obtained coating film to room temperature, it was subjected to a high-pressure mercury lamp at 30 mW / cm². 2 Irradiation with ultraviolet light at an intensity of 100 ppm for 30 seconds yielded a liquid crystal alignment and curing layer with a thickness of 3 μm. The in-plane phase difference Re(550) of the obtained liquid crystal alignment and curing layer was 130 nm, and the Re(450) / Re(550) ratio was 0.851, exhibiting inverse dispersion wavelength characteristics.

[0186] [Chemical Formula 2]

[0187]

[0188] [Chemical Formula 3]

[0189]

[0190] (The formation of the positive C plate)

[0191] A liquid crystal coating solution was prepared by dissolving 20 parts by weight of a side-chain liquid crystal polymer of the following chemical formula (1) (where the numbers 65 and 35 represent the molar percentage of monomer units; for convenience, it is represented as a block polymer with a weight-average molecular weight of 5000), 80 parts by weight of a polymerizable liquid crystal displaying a nematic liquid crystal phase (BASF: Paliocolor LC242), and 5 parts by weight of a photopolymerization initiator (Ciba Specialty Chemicals: Irgacure 907) in 200 parts by weight of cyclopentanone. The coating solution was then applied to a PET substrate that had undergone vertical orientation treatment using a bar coater and heated and dried at 80°C for 4 minutes to orient the liquid crystal. The liquid crystal layer was then irradiated with ultraviolet light to cure it, thereby forming a positive C-plate on the substrate with a thickness of 4 μm and an Rth(550) of -100 nm.

[0192] [Chemical Formula 4]

[0193]

[0194] (Fabrication of the first phase difference component)

[0195] The positive C plate was bonded to the λ / 4 component (liquid crystal alignment curing layer) via a 2μm thick curable adhesive layer, and then the substrate was removed to obtain the first phase difference component.

[0196] [Manufacturing Example 3]

[0197] (Making the B-type board)

[0198] As described below, a positive B-plate with refractive index characteristics of nz > nx > ny was fabricated.

[0199] 48 parts by weight of hydroxypropyl methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "Metolose 60SH-50"), 15601 parts by weight of distilled water, 8161 parts by weight of diisopropyl fumarate, 240 parts by weight of 3-ethyl-3-oxetanebutyl methyl acrylate, and 45 parts by weight of tert-butyl peroxypentanoate as a polymerization initiator were added to an autoclave equipped with a stirrer, cooling pipe, nitrogen inlet pipe, and thermometer. Nitrogen bubbling was performed for 1 hour, followed by stirring and maintaining the mixture at 49°C for 24 hours, thereby carrying out free radical suspension polymerization. The mixture was then cooled to room temperature, and the suspension containing the generated polymer particles was centrifuged. The obtained polymer was washed twice with distilled water and twice with methanol, and then dried under reduced pressure to obtain fumarate resins.

[0200] The obtained fumarate resin was dissolved in a toluene / methyl ethyl ketone mixed solution (toluene / methyl ethyl ketone at 50 wt% / 50 wt%) to prepare a solution with a solid content concentration of 20 wt%. Further, 5 parts by weight of tributyl trimellitate were added as a plasticizer relative to 100 parts by weight of the fumarate resin to obtain a coating. A biaxially oriented polyester (polyethylene terephthalate / polyethylene isophthalate copolymer) biaxially oriented film with a thickness of 75 μm and a width of 1350 mm was used as the support film. The support film was placed in the feed section of the film forming apparatus, fed out, and transported downstream. The obtained coating was applied onto the support film to a dried film thickness of 20 μm, and dried at 140°C to obtain a laminate.

[0201] The obtained laminate was placed in the feeding section of the stretching device, and the laminate was fed out and transported to the downstream side. It was then subjected to unidirectional stretching at the free end in a stretching furnace at a temperature of 140°C. The support film was peeled off from the stretched laminate to obtain a positive B plate (thickness 5μm, Re(550): 35nm, Rth(550): -85nm).

[0202] (Preparation of the negative B plate)

[0203] As the negative B plate, a stretched film of cyclic olefin resin film (manufactured by Zeon Corporation of Japan, trade name: ZT12, thickness: 18μm, Re(550): 116nm, Rth(550): 139nm) was prepared.

[0204] (Fabrication of the second phase difference component)

[0205] The positive B-plate is bonded to one side of the negative B-plate via a 2μm thick curable adhesive layer to obtain a second phase difference component. In the second phase difference component, the angle between the slow axis of the negative B-plate and the slow axis of the positive B-plate is 0°.

[0206] [Manufacturing Example 4]

[0207] (Fabrication of protective components)

[0208] The following hard coating material was applied to an acrylic film (40 μm thick) with an lactone ring structure. The film was heated at 90°C for 1 minute, and the heated coating was then irradiated with a high-pressure mercury lamp, accumulating a light intensity of 300 mJ / cm². 2 The ultraviolet light was used to cure the coating layer, resulting in an acrylic film (44μm thick) with a hard coating layer of 4μm thickness.

[0209] Next, using a wire rod, the anti-reflective coating solution A was applied to the aforementioned hard coating layer. The applied coating solution was then heated at 80°C for 1 minute to dry, forming a coating film. The dried coating film was then irradiated with a high-pressure mercury lamp, accumulating a light intensity of 300 mJ / cm². 2 The ultraviolet light causes the coating to cure, forming an anti-reflective layer A with a thickness of 140nm.

[0210] Next, using a wire rod, the anti-reflective coating solution B was applied to the anti-reflective layer A. The applied solution was then heated at 80°C for 1 minute to dry, forming a coating film. The dried coating film was then irradiated with a high-pressure mercury lamp, accumulating a light intensity of 300 mJ / cm². 2 The ultraviolet light causes the coating to cure, forming an anti-reflective layer B with a thickness of 105 nm.

[0211] Thus, a protective component (44μm thick) was obtained.

[0212] (Hard coating forming material)

[0213] A hard coating forming material was prepared by mixing 50 parts of urethane acrylic oligomer (manufactured by Shin-Nakamura Chemical Co., Ltd., "NK Oligo UA-53H"), 30 parts of polyfunctional acrylate with pentaerythritol triacrylate as the main component (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat#300"), 20 parts of 4-hydroxybutyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.), 1 part of leveling agent (manufactured by DIC Corporation, "GRANDIC PC4100"), and 3 parts of photopolymerization initiator (manufactured by Ciba Japan Corporation, "Irgacure907"), and diluting with methyl isobutyl ketone to make the solid component concentration 50%.

[0214] (Coating solution A for forming anti-reflective layer)

[0215] 100 parts by weight of a multifunctional acrylate (manufactured by Arakawa Chemical Industry Co., Ltd., trade name "OPSTAR KZ6728", solid content 20% by weight), 3 parts by weight of a leveling agent (manufactured by DIC, "GRANDIC PC4100"), and 3 parts by weight of a photopolymerization initiator (manufactured by BASF, trade name "OMNIRAD907", solid content 100% by weight) were mixed. Butyl acetate was used as a diluent to bring the solid content to 12% by weight, and the mixture was stirred to prepare antireflective coating solution A.

[0216] (Coating solution B for forming anti-reflective layer)

[0217] 100 parts by weight of a multifunctional acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat#300", solid content 100 wt%), mainly composed of pentaerythritol triacrylate; 150 parts by weight of hollow nano-silica particles (manufactured by Nichibukai Chemical Industry Co., Ltd., trade name "Thrulya 5320", solid content 20 wt%, weight average particle size 75 nm); 50 parts by weight of solid nano-silica particles (manufactured by Nissan Chemical Industry Co., Ltd., trade name "MEK-2140Z-AC", solid content 30 wt%, weight average particle size 10 nm); 12 parts by weight of a fluorine-containing additive (manufactured by Shin-Etsu Chemical Industry Co., Ltd., trade name "KY-1203", solid content 20 wt%); and 3 parts by weight of a photopolymerization initiator (manufactured by BASF, trade name "OMNIRAD907", solid content 100 wt%) were mixed together. A mixed solvent consisting of TBA (tert-butanol), MIBK (methyl isobutyl ketone), and PMA (propylene glycol monomethyl ether acetate) in a weight ratio of 60:25:15 was added to the mixture as a diluent, so that the total solid content was 4% by weight. The mixture was stirred to prepare coating solution B for forming an antireflective layer.

[0218] [Manufacturing Example 5]

[0219] (Formation of adhesive layer A)

[0220] A monomer mixture containing 92 parts by weight of butyl acrylate, 2.9 parts by weight of acrylic acid, 0.1 parts by weight of 2-hydroxyethyl acrylate, and 5 parts by weight of N-acryloylmorpholine was added to a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet tube, and condenser. Further, relative to 100 parts by weight of this monomer mixture, 0.1 parts by weight of 2,2'-azobisisobutyronitrile (2,2'-Azobisisobutyronitrile) as a polymerization initiator was added together with 200 parts by weight of ethyl acetate. The flask was purged with nitrogen by slowly stirring and introducing nitrogen gas. The liquid temperature in the flask was then maintained at approximately 55°C, and the polymerization reaction was carried out for 8 hours to prepare a solution of an acrylic polymer with a weight-average molecular weight (Mw) of 1.78 million.

[0221] An acrylic polymer solution was applied to a substrate film, and the resulting coating on the substrate film was dried in an oven to form an adhesive layer A with a thickness of 5 μm (elastic modulus: 0.13 MPa).

[0222] [Manufacturing Example 6]

[0223] (Formation of adhesive layer B)

[0224] A monomer mixture containing 94.9 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid, and 0.1 parts by weight of 2-hydroxyethyl acrylate was added to a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet tube, and condenser. Further, 0.3 parts by weight of benzoyl peroxide as a polymerization initiator, along with ethyl acetate, were added to 100 parts by weight of the monomer mixture. The flask was then purged with nitrogen by slowly stirring and introducing nitrogen gas. The liquid temperature in the flask was maintained at approximately 60°C, and the polymerization reaction was carried out for 7 hours. Subsequently, ethyl acetate was added to the resulting reaction solution to adjust the solids concentration to 30% by weight, preparing a solution of an acrylic polymer with a weight-average molecular weight (Mw) of 2.2 million.

[0225] An acrylic adhesive was prepared by adding 0.6 parts by weight of trimethylolpropane / toluene diisocyanate adduct (trade name: Coronate L, manufactured by Tosoh Corporation) and 0.075 parts by weight of silane coupling agent (trade name: KBM403, manufactured by Shin-Etsu Chemical Co., Ltd.) to 100 parts by weight of the solid component of the obtained acrylic polymer solution.

[0226] The obtained acrylic adhesive was applied to the substrate film, and the coating film on the substrate film was dried in an oven to form an adhesive layer B with a thickness of 23 μm and 15 μm (elastic modulus: 0.10 MPa).

[0227] [Example 1]

[0228] The second phase retardation member obtained in Manufacturing Example 3 was bonded to the absorption polarizing film side of the polarizing member obtained in Manufacturing Example 1 via a 2 μm thick curable adhesive layer. At this time, the bonding was performed such that the absorption axis of the polarizing member was orthogonal to the slow axes of the negative B-plate and the positive B-plate. Furthermore, the bonding was performed with the negative B-plate of the second phase retardation member located on the polarizing member side.

[0229] Next, the first phase difference member obtained in Manufacturing Example 2 was bonded to the positive B plate side of the second phase difference member via an adhesive layer A with a thickness of 5 μm obtained in Manufacturing Example 5. At this time, the bonding was performed with the absorption axis of the polarizing member and the slow axis of the λ / 4 member of the first phase difference member forming an angle of 45°. Furthermore, the bonding was performed with the λ / 4 member of the first phase difference member located on the polarizing member side.

[0230] Next, the protective member obtained in Manufacturing Example 4 was attached to the positive C-plate side of the first phase difference member via an adhesive layer B with a thickness of 15 μm obtained in Manufacturing Example 6. At this time, the attachment was performed with the acrylic film of the protective member located on the polarizing member side.

[0231] Thus, an optical laminate was obtained.

[0232] [Example 2]

[0233] When bonding the second phase difference member to the first phase difference member, an adhesive layer B with a thickness of 23 μm obtained in Manufacturing Example 6 was used. Otherwise, an optical laminate was obtained in the same manner as in Example 1.

[0234] [Example 3]

[0235] When bonding the second phase difference member to the first phase difference member, an adhesive layer B with a thickness of 15 μm obtained in Manufacturing Example 6 was used. Otherwise, an optical laminate was obtained in the same manner as in Example 1.

[0236] [Comparative Example 1]

[0237] The second phase difference component and the first phase difference component were bonded together via a 2 μm thick curable adhesive layer. Otherwise, an optical laminate was obtained in the same manner as in Example 1.

[0238] <Evaluation>

[0239] The following evaluations were conducted on each embodiment and comparative example. The evaluation results are summarized in Table 1.

[0240] 1. Phase difference change

[0241] The obtained optical laminate was subjected to a heating test under the following conditions. The phase difference (in-plane phase difference) before and after the heating test was measured, and the phase difference change was calculated. Specifically, using the aforementioned phase difference / elliptically polarized light measurement device, light with a wavelength of 550 nm was incident from the polarizing member side of the optical laminate at 23°C, and the in-plane phase difference Re(550) was measured. It should be noted that the in-plane phase difference of the optical laminate can be equivalent to the in-plane phase difference of the λ / 4 member. In addition, the phase difference change shown in Table 1 is a value calculated according to the formula: Phase difference after heating test - Phase difference before heating test.

[0242] • Heating Test 1: Heating for 168 hours at 65℃ and 90% relative humidity.

[0243] • Heating Test 2: Thermal Cycling Test

[0244] • Heating Test 3: Heating for 120 hours at 85℃ and 85% relative humidity.

[0245] It should be noted that in the above thermal cycling test, the operation of placing the device at 85°C and 0% relative humidity for 30 minutes and then at -40°C and 0% relative humidity for 30 minutes was repeated 100 times.

[0246] 2. Dimensional change rate

[0247] The λ / 4 member (stretched film) described below, serving as the third phase difference member, is bonded to the polarizing member side of the obtained optical laminate via an adhesive layer with a thickness of 12 μm. Then, an adhesive layer B with a thickness of 15 μm, obtained in Manufacturing Example 6, is laminated onto the surface of the λ / 4 member. Next, a measurement sample with a top view of a rectangular shape, measuring 23 mm on the long side and 20 mm on the short side, is cut. At this time, it is cut with the long side along the absorption axis of the polarizing member.

[0248] The obtained sample is attached to a glass plate with straight edges when viewed from above. The straight edges of the glass plate are aligned with the long side of the sample. Then, marking lines are drawn on the glass plate. Specifically, as follows... Figure 3 As shown, marking lines M, parallel to the short side of the sample S, are drawn on the glass plate G at intervals from both ends of the long side of the sample S. Then, using an industrial microscope (Evident, "MX63"), the distances d1 and d2 between the marking lines M and the short side of the sample S are measured at 10x magnification.

[0249] Then, after placing the test sample attached to the glass plate in a heating environment of 85°C and 85% relative humidity for 120 hours, the distances d1 and d2 between the end edge (short side) of each component in the test sample S and the marking line M were measured in the same manner as above, and the dimensional change rate was calculated.

[0250] The dimensional change rate shown in Table 1 is calculated using the formula: (Dimension of the long side before heating - Dimension of the long side after heating) / Dimension of the long side before heating.

[0251] (Fabrication of λ / 4 components)

[0252] Polymerization was carried out using a batch polymerization unit consisting of two vertical reactors equipped with stirring blades and reflux condensers controlled at 100°C. The feed consisted of 29.60 parts by mass (0.046 mol) of bis[9-(2-phenoxycarbonylethyl)fluorene-9-yl]methane, 29.21 parts by mass (0.200 mol) of isosorbide (ISB), 42.28 parts by mass (0.139 mol) of spirodiol (SPG), 63.77 parts by mass (0.298 mol) of diphenyl carbonate (DPC), and 1.19 × 10⁻⁶ mol of calcium acetate monohydrate as a catalyst. -2 Parts by weight (6.78 × 10) -5(mol). After purging the reactor with nitrogen under reduced pressure, heating was performed using a heat transfer medium. Stirring was initiated when the internal temperature reached 100°C. The internal temperature was raised to 220°C 40 minutes after the start of heating. While maintaining this temperature, the pressure was reduced, reaching 13.3 kPa after 90 minutes. Phenolic vapors produced as a byproduct of the polymerization reaction were introduced into a 100°C reflux condenser, allowing a certain amount of monomer components contained in the phenol vapors to return to the reactor, while the uncondensed phenol vapors were recovered in a 45°C condenser. Nitrogen was introduced into the first reactor to temporarily restore atmospheric pressure, and the oligomerized reaction liquid in the first reactor was transferred to the second reactor. Then, heating and depressurization were initiated in the second reactor, reaching an internal temperature of 240°C and a pressure of 0.2 kPa after 50 minutes. Polymerization was then allowed to proceed until the given stirring power was reached. At the moment when the given power is reached, nitrogen is introduced into the reactor to restore the pressure, the generated polyester carbonate resin is extruded into the water, and the wire is cut to obtain granules.

[0253] The obtained polyester carbonate resin (granules) was vacuum dried at 80°C for 5 hours. A strip-shaped resin film with a thickness of 135 μm was then produced using a film-forming apparatus equipped with a single-screw extruder (manufactured by Toshiba Machine Co., Ltd., cylinder set temperature: 250°C), a T-die (width 200 mm, set temperature: 250°C), a chilled roll (set temperature: 120~130°C), and a winding machine. The obtained strip-shaped resin film was stretched along its width at a stretching temperature of 143°C and a stretch ratio of 2.8 times to obtain a stretched film with a thickness of 47 μm. The resulting stretched film had a Re(550) of 143 nm, a Re(450) / Re(550) ratio of 0.86, and an Nz coefficient of 1.12.

[0254]

[0255] Compared to Comparative Example 1, the dimensional change rate of each component in each embodiment is low, and the phase difference change caused by the heating test is very small.

[0256] This invention is not limited to the embodiments described above, and various modifications can be made. For example, it can be replaced with a configuration that is substantially the same as the configuration shown in the above embodiments, a configuration that can perform the same function, or a configuration that can achieve the same purpose.

[0257] Industrial applicability

[0258] The display system of the present invention can be used, for example, in display devices such as VR goggles.

Claims

1. An optical laminate for use in a display method, the display method comprising: The step of causing the light emitted from the polarizing member to display the image to pass through the first λ / 4 member. The step of allowing light that has passed through the first λ / 4 component to pass through the half-reflecting mirror and the first lens section. The step of allowing light that has passed through the semi-reflective mirror and the first lens portion to pass through the second λ / 4 component. The steps of using a reflective polarizing member to reflect light that has passed through the second λ / 4 member toward the semi-reflective mirror, and... The step of using the second λ / 4 component to allow light reflected by the reflective polarizing component and the half-reflective mirror to pass through the reflective polarizing component. The optical laminate has: The polarization component, The first phase difference component including the first λ / 4 component, and An adhesive layer disposed between the polarizing member and the first phase difference member. In the optical laminate, the dimensional change rate of the polarizing member along the absorption axis is greater than 0.50%. The first λ / 4 component is a liquid crystal alignment and curing layer. The elastic modulus of the adhesive layer at 85°C is 0.07 MPa to 0.5 MPa.

2. The optical laminate according to claim 1, wherein, In the optical laminate, the dimensional change rate of the polarization member of the first phase difference member in the absorption axis direction is less than 0.67%.

3. The optical laminate according to claim 1, wherein, The thickness of the first λ / 4 component is less than 5 μm.

4. The optical laminate according to claim 1, wherein, The first phase difference component further includes other phase difference layers.

5. The optical laminate according to claim 1, further comprising a second phase difference member disposed between the polarization member and the first phase difference member.

6. A display system for displaying images to a user, This display system has the following features: A display element having a display surface from which light for displaying an image is emitted forward via a polarizing member; A reflective polarizing member is disposed in front of the display element to reflect light emitted from the display element; A first lens portion is disposed in the optical path between the display element and the reflective polarizing member; A semi-reflective mirror is disposed between the display element and the first lens portion, allowing light emitted from the display element to pass through and causing light reflected by the reflective polarizing member to be reflected toward the reflective polarizing member; A first λ / 4 component is disposed in the optical path between the display element and the semi-reflective mirror; as well as The second λ / 4 component is disposed in the optical path between the semi-reflective mirror and the reflective polarizing component. The display system includes an optical stack, the optical stack having: The polarization component, The first phase difference component including the first λ / 4 component, and An adhesive layer disposed between the polarizing member and the first phase difference member. In the optical laminate, the dimensional change rate of the polarizing member along the absorption axis is greater than 0.50%. The first λ / 4 component is a liquid crystal alignment and curing layer. The elastic modulus of the adhesive layer at 85°C is 0.07 MPa to 0.5 MPa.

7. The display system according to claim 6, wherein, In the optical laminate, the dimensional change rate of the polarization member of the first phase difference member in the absorption axis direction is less than 0.67%.

8. The display system according to claim 6, wherein, The thickness of the first λ / 4 component is less than 5 μm.

9. The display system according to claim 6, wherein, The first phase difference component further includes other phase difference layers.

10. The display system according to claim 6, wherein, The optical stack further has a second phase difference member disposed between the polarization member and the first phase difference member.

11. The display system according to claim 6, wherein, The absolute value of the difference between the in-plane phase difference (a) of the first λ / 4 component and the in-plane phase difference (b) of the second λ / 4 component is less than 3.5 nm.

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