Management method of optical laminate and manufacturing method of display system

Abstract

To provide a manufacturing method of a display system such as high-definition VR goggles.SOLUTION: A management method of first and second optical laminates, includes: (i) classifying a plurality of first optical laminates into Na-number of groups each having a different average value of an in-plane phase difference; (ii) classifying a plurality of second optical laminates into Nb-number of groups each having a different average value of the in-plane phase difference; (iii) matching a combination A of a 1a group and a 1b group, and a combination B of a 3a group and a 3b group on the basis of the average value of the in-plane phase difference; and (iv) allocating first optical laminates included in the 2a group and second optical laminates included in the 2b group to the combination A and / or the combination B respectively such that a difference between the number of the first optical laminates and the number of the second optical laminates in the combination A and / or the combination B becomes small.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a method for managing an optical stack and a method for manufacturing a display system. [Background technology]

[0002] Image display devices, such as liquid crystal display devices and electroluminescence (EL) display devices (e.g., organic EL display devices), are rapidly becoming widespread. In image display devices, optical members such as polarizing members and phase difference members are generally used to realize image display and to improve the performance of the image display (see, for example, Patent Document 1).

[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. As VR goggles are being considered for use in a variety of situations, there is a demand for higher resolution, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-103286 A Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, a primary object of the present invention is to provide a manufacturing method for a display system such as high-definition VR goggles. [Means for solving the problem]

[0006] [1] According to one aspect of the present invention, there is provided a method for managing a first optical laminate including a first λ / 4 component and a second optical laminate including a second λ / 4 component, the method comprising: (i) classifying a plurality of the first optical laminates into Na groups having different average values ​​of in-plane retardation (here, the Na groups include group 1a, group 2a, and group 3a which are consecutive in this order when sorted in order of magnitude of the average value, the maximum value of the in-plane retardation of the first optical laminate in group 2a is smaller than the maximum value of the in-plane retardation of the first optical laminate in group 1a, and the minimum value of the in-plane retardation of the first optical laminate in group 2a is larger than the minimum value of the in-plane retardation of the first optical laminate in group 3a); (ii) classifying a plurality of the second optical laminates into Nb groups having different average values ​​of in-plane retardation (wherein the Nb groups include a 1b group, a 2b group, and a 3b group which are consecutive in this order when arranged in order of magnitude of the average value, and the maximum value of the in-plane retardation of the second optical laminate in the 2b group is smaller than the maximum value of the in-plane retardation of the second optical laminate in the 1b group, and the minimum value of the in-plane retardation of the second optical laminate in the 2b group is larger than the minimum value of the in-plane retardation of the second optical laminate in the 3b group); (iii) matching a combination A of the 1a group and the 1b group, and a combination B of the 3a group and the 3b group based on the average value of the in-plane retardation; and (iv) allocating the first optical laminate included in the group 2a and the second optical laminate included in the group 2b to the combination A and / or the combination B such that the difference between the number of the first optical laminate and the number of the second optical laminate in the combination A and / or the combination B is small; A management method is provided, including: [2] In the management method described in [1] above, the variation in in-plane retardation of the first optical laminate in each of the Na groups may be 0.1 nm to 10 nm, and / or the variation in in-plane retardation of the second optical laminate in each of the Nb groups may be 0.1 nm to 10 nm. [3] In the management method described in [1] or [2] above, the maximum value of the in-plane retardation of the first optical laminate in the 2a group may be greater than the minimum value of the in-plane retardation of the first optical laminate in the 1a group, and / or the maximum value of the in-plane retardation of the second optical laminate in the 2b group may be greater than the minimum value of the in-plane retardation of the second optical laminate in the 1b group. [4] In the management method according to any one of [1] to [3] above, the maximum value of the in-plane retardation of the first optical laminate in the 2a group may be equal to or less than the average value of the in-plane retardation of the first optical laminate in the 1a group, and / or the maximum value of the in-plane retardation of the second optical laminate in the 2b group may be equal to or less than the average value of the in-plane retardation of the second optical laminate in the 1b group. [5] In the management method according to any one of [1] to [4] above, the minimum value of the in-plane retardation of the first optical laminate in the 2a group may be smaller than the maximum value of the in-plane retardation of the first optical laminate in the 3a group, and / or the minimum value of the in-plane retardation of the second optical laminate in the 2b group may be smaller than the maximum value of the in-plane retardation of the second optical laminate in the 3b group. [6] In the management method according to any one of [1] to [5] above, the minimum value of the in-plane retardation of the first optical laminate in the 2a group may be equal to or greater than the average value of the in-plane retardation of the first optical laminate in the 3a group, and / or the minimum value of the in-plane retardation of the second optical laminate in the 2b group may be equal to or greater than the average value of the in-plane retardation of the second optical laminate in the 3b group. [7] In the management method described in any of [1] to [6] above, the number of the first optical laminates included in the group 2a may be 50% or more of the total number of the first optical laminates included in the group 1a and the group 3a, and / or the number of the second optical laminates included in the group 2b may be 50% or more of the total number of the second optical laminates included in the group 1b and the group 3b. [8] In the management method according to any one of the above [1] to [7], Na may be an integer of 3 to 10, and / or Nb may be an integer of 3 to 10. [9] In the management method according to any one of [1] to [8] above, the variation in in-plane retardation among the plurality of first optical laminates before the classification may be 1.0 nm to 20 nm, and / or the variation in in-plane retardation among the plurality of second optical laminates before the classification may be 1.0 nm to 20 nm.

[10] According to another aspect of the present invention, there is provided a manufacturing method for a display system that displays an image to a user, comprising: a display element having a display surface that emits light representing an image forward via a polarizing member; a reflective polarizing member that is arranged in front of the display element and reflects the light emitted from the display element; a first lens unit that is arranged on an optical path between the display element and the reflective polarizing member; a half mirror that is arranged between the display element and the first lens unit and transmits the light emitted from the display element and reflects the light reflected by the reflective polarizing member toward the reflective polarizing member; a first λ / 4 member that is arranged on the optical path between the display element and the half mirror; and a second λ / 4 member that is arranged on the optical path between the half mirror and the reflective polarizing member; the manufacturing method includes manufacturing the display system using the first optical stack and the second optical stack that are assigned to the same combination by any one of the management methods [1] to [9] above. Effect of the Invention

[0007] According to the method for managing an optical laminate and the method for manufacturing a display system according to the embodiment of the present invention, a display system such as high-definition VR goggles can be efficiently manufactured. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a general configuration of a display system according to an embodiment of the present invention. [Diagram 2]FIG. 2 is a schematic diagram illustrating an example of variation in in-plane retardation of the first optical laminate in the 1a group, the 2a group, and the 3a group. [Diagram 3] 1(a) to 1(c) are schematic diagrams illustrating an example of the variation in the in-plane retardation of the first optical laminate in the 1a group, the 2a group, and the 3a group, respectively. [Figure 4] FIG. 11 is a schematic diagram illustrating an example of the variation in the in-plane retardation of the second optical laminate in the 1b group, the 2b group, and the 3b group. [Diagram 5] FIG. 11 is a schematic diagram illustrating an example of step iii. [Figure 6] FIG. 4 is a schematic diagram illustrating an example of step iv. [Figure 7] FIG. 4 is a schematic diagram illustrating an example of step iv. [Figure 8] FIG. 4 is a schematic diagram illustrating an example of step iv. [Figure 9] 1 is a schematic cross-sectional view showing an example of the configuration of a first optical laminate. [Figure 10] FIG. 2 is a schematic cross-sectional view showing an example of the configuration of a second optical laminate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. In order to clarify the description, the drawings may show the width, thickness, shape, etc. of each part more diagrammatically than the embodiments, but these are merely examples and do not limit the interpretation of the present invention.

[0010] (Definition of terms and symbols) The definitions of terms and symbols used in this specification are as follows. (1) Refractive index (nx, ny, nz) "nx" is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., the slow axis direction), "ny" is the refractive index in the direction perpendicular to the slow axis in the plane (i.e., the fast axis direction), and "nz" is the refractive index in the thickness direction. (2) In-plane phase difference (Re) "Re(λ)" is the in-plane retardation measured with light of wavelength λ nm at 23° C. For example, "Re(550)" is the in-plane retardation measured with light of wavelength 550 nm at 23° C. Re(λ) is calculated by the formula: Re(λ)=(nx-ny)×d, where d(nm) is the thickness of the layer (film). (3) Retardation in the thickness direction (Rth) "Rth(λ)" is the retardation in the thickness direction measured with light of wavelength λ nm at 23° C. For example, "Rth(550)" is the retardation in the thickness direction measured with light of wavelength 550 nm at 23° C. Rth(λ) is calculated by the formula: Rth(λ)=(nx-nz)×d, where d(nm) is the thickness of the layer (film). (4) Nz coefficient The Nz coefficient is calculated by Nz=Rth / Re. (5)Angle When an angle is mentioned in this specification, the angle includes both clockwise and counterclockwise angles with respect to a reference direction unless otherwise specified. Thus, for example, "45°" means ±45°. Also, in this specification, "substantially parallel" includes a range of 0°±10°, preferably within a range of 0°±5°. "Substantially perpendicular" includes a range of 90°±10°, preferably within a range of 90°±5°.

[0011] A. Display System FIG. 1 is a schematic diagram showing a schematic configuration of a display system according to one embodiment of the present invention. In FIG. 1, the arrangement and shape of each component of a display system 2 are illustrated. The display system 2 includes a display element 12, a reflective polarizing member 14, a first lens unit 16, a half mirror 18, a first phase difference member 20, a second phase difference member 22, and a second lens unit 24. The reflective polarizing member 14 is disposed in front of the display surface 12a side of the display element 12, and can reflect light emitted from the display element 12. The first lens unit 16 is disposed on the optical path between the display element 12 and the reflective polarizing member 14, and the half mirror 18 is disposed between the display element 12 and the first lens unit 16. The first phase difference member 20 is disposed on the optical path between the display element 12 and the half mirror 18, and the second phase difference member 22 is disposed on the optical path between the half mirror 18 and the reflective polarizing member 14.

[0012] The display element 12 is, for example, a liquid crystal display or an organic EL display, and has a display surface 12a for displaying an image. The light emitted from the display surface 12a passes through, for example, a polarizing member (typically, a polarizing film) that may be included in the display element 12, and is converted into a first linearly polarized light.

[0013] The first phase difference member 20 includes a first λ / 4 member that can convert a first linearly polarized light incident on the first phase difference member 20 into a first circularly polarized light. When the first phase difference member does not include a member other than the first λ / 4 member, the first phase difference member may correspond to the first λ / 4 member. The first phase difference member 20 may be provided integrally with the display element 12.

[0014] The half mirror 18 transmits the light emitted from the display element 12 and reflects the light reflected by the reflective polarizing member 14 toward the reflective polarizing member 14. The half mirror 18 is provided integrally with the first lens portion 16.

[0015] The second phase difference member 22 includes a second λ / 4 member that can transmit light reflected by the reflective polarizing member 14 and the half mirror 18 through the reflective polarizing member 14. When the second phase difference member does not include any member other than the second λ / 4 member, the second phase difference member may correspond to the second λ / 4 member. The second phase difference member 22 may be provided integrally with the first lens portion 16.

[0016] The first circularly polarized light output from the first λ / 4 member included in the first phase difference member 20 passes through the half mirror 18 and the first lens unit 16, and is converted into the second linearly polarized light by the second λ / 4 member included in the second phase difference member 22. The second linearly polarized light output from the second λ / 4 member is reflected toward the half mirror 18 without passing through the reflective polarizing member 14. At this time, the polarization direction of the second linearly polarized light incident on the reflective polarizing member 14 is the same as the reflection axis of the reflective polarizing member 14. Therefore, the second linearly polarized light incident on the reflective polarizing member 14 is reflected by the reflective polarizing member 14.

[0017] The second linearly polarized light reflected by the reflective polarizing member 14 is converted into the second circularly polarized light by the second λ / 4 member included in the second phase difference member 22, and the second circularly polarized light output from the second λ / 4 member passes through the first lens unit 16 and is reflected by the half mirror 18. The second circularly polarized light reflected by the half mirror 18 passes through the first lens unit 16 and is converted into the third linearly polarized light by the second λ / 4 member included in the second phase difference member 22. The third linearly polarized light passes through the reflective polarizing member 14. At this time, the polarization direction of the third linearly polarized light incident on the reflective polarizing member 14 is the same as the transmission axis of the reflective polarizing member 14. Therefore, the third linearly polarized light incident on the reflective polarizing member 14 passes through the reflective polarizing member 14.

[0018] The light transmitted through the reflective polarizing member 14 passes through the second lens portion 24 and enters the eye 26 of the user.

[0019] Although not shown, the display system 2 may include an absorptive polarizing member (typically, an absorptive polarizing film) in front of the reflective polarizing member 14. The reflection axis of the reflective polarizing member 14 and the absorption axis of the absorptive polarizing member may be arranged substantially parallel to each other, and the transmission axis of the reflective polarizing member and the transmission axis of the absorptive polarizing member may be arranged substantially parallel to each other. This allows the third linearly polarized light that has passed through the reflective polarizing member 14 to pass through the absorptive polarizing member as it is.

[0020] For example, the absorption axis of the polarizing member that can be included in the display element 12 and the reflection axis of the reflective polarizing member 14 may be disposed approximately parallel to each other or approximately perpendicular to each other. The angle between the absorption axis of the polarizing member that can be included in the display element 12 and the slow axis of the first λ / 4 member included in the first phase difference member 20 is, for example, 40° to 50°, may be 42° to 48°, or may be about 45°. The angle between the absorption axis of the polarizing member that can be included in the display element 12 and the slow axis of the second λ / 4 member included in the second phase difference member 22 is, for example, 40° to 50°, may be 42° to 48°, or may be about 45°.

[0021] The in-plane retardation Re(550) of the first λ / 4 member is, for example, 100 nm to 190 nm, and may be 110 nm to 180 nm, 130 nm to 160 nm, or 135 nm to 155 nm. The first λ / 4 member preferably exhibits an inverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light. The Re(450) / Re(550) of the first λ / 4 member may be, for example, 0.75 or more and less than 1, or 0.8 or more and 0.95 or less.

[0022] The in-plane retardation Re(550) of the second λ / 4 member is, for example, 100 nm to 190 nm, and may be 110 nm to 180 nm, 130 nm to 160 nm, or 135 nm to 155 nm. The second λ / 4 member preferably exhibits an inverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light. The Re(450) / Re(550) of the second λ / 4 member may be, for example, 0.75 or more and less than 1, or 0.8 or more and 0.95 or less.

[0023] The reflective polarizing member can transmit polarized light (typically, linearly polarized light) parallel to its transmission axis while maintaining its polarization state, and can reflect light in other polarization states. The orthogonal transmittance (Tc) of the reflective polarizing member can be, for example, 0.01% to 3%. The single transmittance (Ts) of the reflective polarizing member can be, for example, 43% to 49%, preferably 45% to 47%. The polarization degree (P) of the reflective polarizing member can be, for example, 92% to 99.99%. The reflective polarizing member is typically composed of a film (sometimes referred to as a reflective polarizing film) having a multilayer structure. Commercially available reflective polarizing films include, for example, 3M's product names "DBEF" and "APF" and Nitto Denko's product name "APCF".

[0024] The crossed transmittance, single transmittance and degree of polarization can be measured, for example, using an ultraviolet-visible spectrophotometer. The degree of polarization P can be calculated from the obtained Tp and Tc by measuring the single transmittance Ts, parallel transmittance Tp and crossed transmittance Tc using an ultraviolet-visible spectrophotometer, using the following formula. Note that Ts, Tp and Tc are Y values ​​measured using a 2-degree visual field (C light source) according to JIS Z 8701 and corrected for visibility. Polarization degree P(%)={(Tp-Tc) / (Tp+Tc)} 1 / 2 ×100

[0025] As described above, in the display system 2, the linearly polarized light emitted forward from the display surface 12a of the display element 12 passes through the first λ / 4 member and the second λ / 4 member in this order, and then passes through the second λ / 4 member twice more by reflection at the reflective polarizing member 14 and re-reflection at the half mirror 18, and passes through the reflective polarizing member 14 and emits forward, and is thereby visually recognized by the viewer. Therefore, if there is a large difference between the in-plane phase difference of the first λ / 4 member and the in-plane phase difference of the second λ / 4 member, the polarization is broken, light leakage occurs, and the light that should be reflected is mixed with the light that should be viewed (as a result, a blurred image is viewed). In order to prevent such a problem and display a high-definition image, it is desirable that the in-plane phase differences of the first λ / 4 member and the second λ / 4 member are at the same level.

[0026] B. Management method of optical laminate According to another aspect of the present invention, there is provided a method for managing an optical stack that can be used in the display system described in section A. The method for managing an optical stack according to an embodiment of the present invention is a method for managing a first optical stack including the first λ / 4 member and a second optical stack including the second λ / 4 member, comprising the steps of: (i) classifying a plurality of the first optical laminates into Na groups having different average values ​​of in-plane retardation (here, the Na groups include group 1a, group 2a, and group 3a which are consecutive in this order when sorted in order of magnitude of the average value, the maximum value of the in-plane retardation of the first optical laminate in group 2a is smaller than the maximum value of the in-plane retardation of the first optical laminate in group 1a, and the minimum value of the in-plane retardation of the first optical laminate in group 2a is larger than the minimum value of the in-plane retardation of the first optical laminate in group 3a); (ii) classifying a plurality of the second optical laminates into Nb groups having different average values ​​of in-plane retardation (wherein the Nb groups include a 1b group, a 2b group, and a 3b group which are consecutive in this order when arranged in order of magnitude of the average value, and the maximum value of the in-plane retardation of the second optical laminate in the 2b group is smaller than the maximum value of the in-plane retardation of the second optical laminate in the 1b group, and the minimum value of the in-plane retardation of the second optical laminate in the 2b group is larger than the minimum value of the in-plane retardation of the second optical laminate in the 3b group); (iii) matching a combination A of the 1a group and the 1b group, and a combination B of the 3a group and the 3b group based on the average value of the in-plane retardation; and (iv) allocating the first optical laminate included in the group 2a and the second optical laminate included in the group 2b to the combination A and / or the combination B such that the difference between the number of the first optical laminate and the number of the second optical laminate in the combination A and / or the combination B is small; Includes. According to the above-mentioned method for managing optical stacks, it is possible to create a combination of a first optical stack and a second optical stack in which the first λ / 4 member and the second λ / 4 member have the same level of in-plane retardation. Furthermore, by creating two or more such combinations and preparing an optical stack having an intermediate level of in-plane retardation between these combinations, it is possible to suppress the generation of surplus members in each combination. By manufacturing a display system using the first optical stack and the second optical stack that belong to the same combination in such a method for managing optical stacks, it is possible to improve manufacturing efficiency and productivity.

[0027] In the above-mentioned method for managing an optical laminate, the in-plane retardation of the first optical laminate and the in-plane retardation of the second optical laminate may correspond to the in-plane retardation of the first λ / 4 member and the second λ / 4 member, respectively. The optical laminate to be managed may be an optical laminate piece having a shape (approximately rectangular, approximately circular, etc.) applied to a display system, or may be a large-sized optical laminate (mother sheet or roll) before being punched or cut into such optical laminate pieces. In one embodiment, the optical laminate to be managed is a large-sized optical laminate before being punched or cut into optical laminate pieces.

[0028] In the above-mentioned method for managing the optical laminate, the wavelength for measuring the in-plane retardation is not particularly limited. For example, Re(590) can be used as the in-plane retardation. The in-plane retardation of the optical laminate may be the in-plane retardation at any one point in the plane of the optical laminate, but it is preferable to use the average value of the in-plane retardations at multiple points in the plane.

[0029] In the above-mentioned method for managing optical laminates, a plurality of first optical laminates are classified into Na groups each having a different average value of in-plane retardation, and a plurality of second optical laminates are classified into Nb groups each having a different average value of in-plane retardation. The number of optical laminates included in each of the Na groups and the Nb groups can be 100 to 10,000, for example, 100 to 1,000, or for example, 1,000 to 10,000.

[0030] When Na groups are arranged in order of the average value of the in-plane retardation of the first optical laminate in each group, the difference in the average value between the preceding and succeeding groups is, for example, 0.5 nm to 2.0 nm, preferably 1.0 nm to 1.5 nm. The difference in the average value is preferably substantially constant. In one embodiment, the first optical laminate is classified so that the average value of the in-plane retardation is substantially equally spaced. When the Nb groups are arranged in order of the average value of the in-plane retardation of the second optical laminate in each group, the difference in the average value between the preceding and succeeding groups is, for example, 0.5 nm to 2.0 nm, preferably 1.0 nm to 1.5 nm. The difference in the average value is preferably approximately constant. In one embodiment, the second optical laminate is classified so that the average value of the in-plane retardation is approximately equally spaced.

[0031] The variation in in-plane retardation (the difference between the maximum and minimum values ​​of the in-plane retardation) across the entire plurality of first optical laminates before classification may be, for example, 1.0 nm or more, 3.0 nm or more, or 5.0 nm or more, and may be, for example, 20 nm or less, or 18 nm or less. The variation in in-plane retardation (the difference between the maximum and minimum values ​​of the in-plane retardation) across the entire plurality of second optical laminates before classification may be, for example, 1.0 nm or more, 3.0 nm or more, or 5.0 nm or more, and may be, for example, 20 nm or less, or 18 nm or less.

[0032] The number of groups (Na, Nb) and the variation in the in-plane retardation of the first optical laminate or the second optical laminate in each group (the difference between the maximum and minimum values ​​of the in-plane retardation) can be appropriately set according to the variation in the in-plane retardation of the entire first optical laminate or the entire second optical laminate before classification. For example, the variation in the in-plane retardation of the first optical laminate or the second optical laminate in each group can be, for example, 0.1 nm to 10 nm. In addition, Na and Nb can each be an integer of, for example, 3 to 10, preferably 3 to 7, and more preferably 3 to 5. Na and Nb may be the same or different from each other. Preferably, Na and Nb are the same number.

[0033] Hereinafter, each step will be specifically described using an embodiment in which Na and Nb are 3 as an example.

[0034] B-1. Step i 2 is a schematic diagram illustrating an example of the variation of the in-plane retardation of the first optical laminate in the 1a group, the 2a group, and the 3a group. The arrows for each group indicate the variation of the in-plane retardation of the first optical laminate in the group, with the upper end indicating the maximum value of the in-plane retardation of the first optical laminate in the group, and the lower end indicating the minimum value of the in-plane retardation of the first optical laminate in the group. The same applies to the following Figures 3 to 8.

[0035] In the illustrated embodiment, the first optical laminates are classified into groups 1a, 2a, and 3a, which have different average values ​​of in-plane retardation. The average value of the in-plane retardation of the first optical laminates in each group is the largest in group 1a, the second largest in group 2a, and the smallest in group 3a.

[0036] 2, the maximum value of the in-plane retardation of the first optical laminate in the 2a group is smaller than the maximum value of the in-plane retardation of the first optical laminate in the 1a group, and the minimum value of the in-plane retardation of the first optical laminate in the 2a group is larger than the minimum value of the in-plane retardation of the first optical laminate in the 3a group. That is, in terms of the variation in the in-plane retardation, the 2a group is located between the 1a group and the 3a group.

[0037] The variation in the in-plane retardation of the first optical laminate in each group (the difference between the upper end and the lower end of the arrow in each group) is, for example, 0.1 nm to 10 nm, and may be 1 nm to 7 nm or 3 nm to 5 nm.

[0038] The maximum value of the in-plane retardation of the first optical laminate in the 2a group is preferably equal to or greater than the minimum value of the in-plane retardation of the first optical laminate in the 1a group, and more preferably is greater than the minimum value of the in-plane retardation of the first optical laminate in the 1a group. In one embodiment, the maximum value of the in-plane retardation of the first optical laminate in the 2a group is greater than the minimum value of the in-plane retardation of the first optical laminate in the 1a group and is equal to or less than the average value. The effect of the present invention can be more suitably obtained by having such an overlap of the in-plane retardation variation between the 1a group and the 2a group.

[0039] The minimum value of the in-plane retardation of the first optical laminate in the 2a group is preferably equal to or less than the maximum value of the in-plane retardation of the first optical laminate in the 3a group, and more preferably, is smaller than the maximum value of the in-plane retardation of the first optical laminate in the 3a group. In one embodiment, the minimum value of the in-plane retardation of the first optical laminate in the 2a group is smaller than the maximum value of the in-plane retardation of the first optical laminate in the 3a group and is equal to or greater than the average value. The effect of the present invention can be more suitably obtained by having such an overlap of the in-plane retardation variation between the 2a group and the 3a group.

[0040] In one embodiment, the number of first optical laminates included in group 2a is 50% or more, preferably 50% to 80%, more preferably 60% to 80% of the total number of first optical laminates included in groups 1a and 3a. By setting the number of first optical laminates included in group 2a to the above ratio, the effects of the present invention can be more suitably obtained.

[0041] The classification method of the 1a group, the 2a group, and the 3a group is not limited to the illustrated example. For example, FIG. 3(a)-(c) are schematic diagrams illustrating another example of the variation of the in-plane retardation of the first optical laminate in the 1a group, the 2a group, and the 3a group, respectively. As shown in FIG. 3(a) or (b), the variation of the in-plane retardation of the first optical laminate in the 2a group may overlap only with either one of the variations of the 1a group and the 3a group. In addition, as shown in FIG. 3(c), the 1a group, the 2a group, and the 3a group can also be classified so that the variation of the in-plane retardation of the first optical laminate in each group does not overlap.

[0042] B-2. Step ii 4 is a schematic diagram illustrating an example of the variation in the in-plane retardation of the second optical laminate in the 1b group, the 2b group, and the 3b group. In the illustrated example, a plurality of second optical laminates are classified into the 1b group, the 2b group, and the 3b group, which have different average values ​​of the in-plane retardation. The average value of the in-plane retardation of the second optical laminate in each group is the largest in the 1b group, the second largest in the 2b group, and the smallest in the 3b group.

[0043] As a classification method, a method similar to the classification method of the first optical laminate can be adopted. Specifically, as shown in FIG. 4, the maximum value of the in-plane retardation of the second optical laminate in the 2b group is smaller than the maximum value of the in-plane retardation of the second optical laminate in the 1b group, and the minimum value of the in-plane retardation of the second optical laminate in the 2b group is larger than the minimum value of the in-plane retardation of the second optical laminate in the 3b group. That is, in terms of the variation of the in-plane retardation, the 2b group is located between the 1b group and the 3b group.

[0044] The variation in the in-plane retardation of the second optical laminate in each group is, for example, 0.1 nm to 10 nm, and may be 1 nm to 7 nm or 3 nm to 5 nm.

[0045] The maximum value of the in-plane retardation of the second optical laminate in the 2b group is preferably equal to or greater than the minimum value of the in-plane retardation of the second optical laminate in the 1b group, and more preferably is greater than the minimum value of the in-plane retardation of the second optical laminate in the 1b group. In one embodiment, the maximum value of the in-plane retardation of the second optical laminate in the 2b group is greater than the minimum value of the in-plane retardation of the second optical laminate in the 1b group and is equal to or less than the average value. The effect of the present invention can be more suitably obtained by having such an overlap of the in-plane retardation variation between the 1b group and the 2b group.

[0046] The minimum value of the in-plane retardation of the second optical laminate in the 2b group is preferably equal to or less than the maximum value of the in-plane retardation of the second optical laminate in the 3b group, and more preferably, is smaller than the maximum value of the in-plane retardation of the second optical laminate in the 3b group. In one embodiment, the minimum value of the in-plane retardation of the second optical laminate in the 2b group is smaller than the maximum value of the in-plane retardation of the second optical laminate in the 3b group and is equal to or greater than the average value. The effect of the present invention can be more suitably obtained by having such an overlap of the in-plane retardation variation between the 2b group and the 3b group.

[0047] In one embodiment, the number of second optical laminates included in group 2b is 50% or more, preferably 50% to 80%, more preferably 60% to 80% of the total number of second optical laminates included in groups 1b and 3b. By setting the number of second optical laminates included in group 2b to the above ratio, the effects of the present invention can be more suitably obtained.

[0048] The classification method of the 1b group, the 2b group, and the 3b group is not limited to the illustrated example. For example, as in the example shown in FIG. 3(a) or (b), the variation of the in-plane retardation of the second optical laminate in the 2b group may overlap only with either the variation of the 1b group or the variation of the 3b group. Also, as in the example shown in FIG. 3(c), the 1b group, the 2b group, and the 3b group can be classified so that the variation of the in-plane retardation of the second optical laminate in each group does not overlap.

[0049] B-3. ​​Step iii Next, based on the average value of the in-plane retardation in each group, as shown in FIG. 5, a combination A of the 1a group and the 1b group, and a combination B of the 3a group and the 3b group are matched from each group classified in step i and step ii. The 1a group includes an optical laminate having a relatively large in-plane retardation in the entire first optical laminate before classification, and the 1b group includes an optical laminate having a relatively large in-plane retardation in the entire second optical laminate before classification. The 3a group includes an optical laminate having a relatively small in-plane retardation in the entire first optical laminate before classification, and the 3b group includes an optical laminate having a relatively small in-plane retardation in the entire second optical laminate before classification. Therefore, by matching in this way, the first optical laminate and the second optical laminate having the same level of in-plane retardation of the first λ / 4 member and the second λ / 4 member can be suitably combined. Furthermore, by matching in this manner, Group 2a and Group 2b can be used in combination A and combination B in common, as will be described in detail in step iv.

[0050] In the matched 1a group and 1b group, the difference in the average value of the in-plane retardation of the optical laminate in both groups can be, for example, 1.0 nm or less, or, for example, 0.5 nm or less. Similarly, in the matched 3a group and 3b group, the difference in the average value of the in-plane retardation of the optical laminate in both groups can be, for example, 1.0 nm or less, or, for example, 0.5 nm or less.

[0051] B-4. Step IV Next, the first optical stack included in the 2a group and the second optical stack included in the 2b group are respectively allocated to the combination A and / or the combination B so that the difference between the number of the first optical stack and the number of the second optical stack in the combination A and / or the combination B is small. When manufacturing a display system using the first optical stack and the second optical stack included in the two groups combined as described above, if the numbers of optical stacks included in these groups are different from each other, the optical stack with the larger number will be surplus because there is no paired optical stack. Therefore, by replenishing the first optical stack and / or the second optical stack from the 2a group and / or the 2b group so that the surplus of any optical stack in each combination is reduced, it is possible to suitably suppress the occurrence of surplus optical stacks when manufacturing a display system. In addition, in the display system obtained by this, it is possible to prevent the in-plane retardation of the first λ / 4 member and the second λ / 4 member from shifting significantly, and as a result, a high-definition display system can be obtained.

[0052] An example of step iv is shown in FIG. 6. In the example shown in FIG. 6, a total of 200 first optical laminates are classified into 65 in group 1a, 65 in group 2a, and 70 in group 3a, and a total of 200 second optical laminates are classified into 75 in group 1b, 65 in group 2b, and 60 in group 3b. In this case, in combination A, the number of optical laminates in group 1a is 10 less than that in group 1b, and in combination B, the number of optical laminates in group 3a is 10 more than that in group 3b. Therefore, by allocating 35 and 30 optical laminates from group 2a to combination A and combination B, respectively, and allocating 25 and 40 optical laminates from group 2b to combination A and combination B, respectively, it is possible to obtain 100 pairs of first optical laminates and second optical laminates in each of combinations A and B without excess or deficiency. Needless to say, the number of optical laminates allocated from Group 2a and Group 2b to Combination A and Combination B is not limited as long as the surplus number of optical laminates in each combination is small.

[0053] B-5. Modifications Although the embodiment in which Na and Nb are 3 has been described above, as mentioned above, the present invention is not limited to the above embodiment, and among three or more groups having different average values ​​of in-plane retardation, any three groups consecutive in order of magnitude of the average value can be the 1a group and the 1b group, the 2a group and the 2b group, and the 3a group and the 3b group, and the above steps i to iv can be performed. For example, when Na and Nb are odd numbers, the 2n-1 group, the 2n group, and the 2n+1 group consecutive in order of magnitude of the average value of the in-plane retardation can be managed in the same manner as above as the 1st group (1a group, 1b group), the 2nd group (2a group, 2b group), and the 3rd group (3a group, 3b group), respectively (n is an integer of 1 or more, for example, 1 to 4). Furthermore, for example, when Na and Nb are even numbers, the consecutive 2n-1 group, 2n group, and 2n+1 group in order of the magnitude of the average in-plane retardation can be managed in the same manner as above as the first group (group 1a, group 1b), the second group (group 2a, group 2b), and the third group (group 3a, group 3b), respectively, and for the last groups (groups 6a and 6b when Na=Nb=6), the last groups can be combined with each other, or incorporated into the group before them, etc.

[0054] FIG. 7 is a schematic diagram for explaining an example of step iv when Na and Nb are 4. As shown in FIG. 7, when Na and Nb are 4, in addition to the 1a group to the 3a group and the 1b group to the 3b group, the 4a group, which has a smaller average value of the in-plane retardation than the 3a group, and the 4b group, which has a smaller average value of the in-plane retardation than the 3b group, may be set. The maximum values ​​of the in-plane retardation of the optical laminates in the 4a group and the 4b group are smaller than the maximum values ​​of the in-plane retardation of the optical laminates in the 3a group and the 3b group. In this case, the optical laminates included in the 2a group and the 2b group can be distributed to the combination A and / or the combination B so that the number of surplus optical laminates in the combination A and the combination B is reduced, and the optical laminates included in the 4a group and the 4b group can be incorporated into the combination B. Also, unlike the illustrated example, a combination C of the 4a group and the 4b group may be set.

[0055] FIG. 8 is a schematic diagram for explaining an example of step iv when Na and Nb are 5. As shown in FIG. 8, when Na and Nb are 5, in addition to the 1a group to the 4a group and the 1b group to the 4b group, the 5a group and the 5b group having a smaller average value of the in-plane retardation than the 4a group and the 4b group may be set. The maximum value of the in-plane retardation of the optical laminate in the 5a group and the 5b group is smaller than the maximum value of the in-plane retardation of the optical laminate in the 4a group and the 4b group. In this case, in addition to the combination A and the combination B, the combination C of the 5a group and the 5b group is matched, and the optical laminate in the 2a group and the 2b group can be assigned to the combination A and / or the combination B, and the optical laminate in the 4a group and the 4b group can be assigned to the combination B and / or the combination C so that the number of surplus optical laminates in each combination is reduced.

[0056] B-6. First optical laminate FIG. 9 is a schematic cross-sectional view showing an example of the configuration of the first optical laminate. The first optical laminate 100 includes a polarizing member 10 and a first phase difference member 20 in this order. The polarizing member 10 and the first phase difference member 20 are laminated via an adhesive layer (for example, a pressure-sensitive adhesive layer). The first optical laminate 100 further includes a first protective member 31 arranged on the side of the first phase difference member 20 opposite to the side on which the polarizing member 10 is arranged. The first protective member 31 is laminated on the first phase difference member 20 via an adhesive layer (for example, a pressure-sensitive adhesive layer). The first optical laminate 100 further includes a first pressure-sensitive adhesive layer 41 arranged on the side of the polarizing member 10 opposite to the side on which the first phase difference member 20 is arranged. A release liner 51 is temporarily attached to the surface of the first pressure-sensitive adhesive layer 41. The polarizing member 10 is a polarizing member that can be included in the display element 12. The first optical laminate can be integrated with the display element 12 by the first pressure-sensitive adhesive layer 41 after the first release liner 51 is peeled off.

[0057] In the example shown in FIG. 9, the first phase difference member 20 includes a member (hereinafter also referred to as a "first positive C plate") 20b whose refractive index characteristics show the relationship of nz>nx=ny in addition to the first λ / 4 member 20a. The first phase difference member 20 has a laminated structure of the first λ / 4 member 20a and the first positive C plate 20b. By using the first positive C plate 20b, it is possible to prevent light leakage (for example, light leakage in an oblique direction). As shown in the example, in the first phase difference member 20, it is preferable that the first λ / 4 member 20a is located closer to the polarizing member 10 than the first positive C plate 20b. The first λ / 4 member 20a and the first positive C plate 20b are typically laminated via an adhesive layer (for example, an adhesive layer).

[0058] B-6-1.Polarizing materials The polarizing member 10 is typically an absorptive polarizing member. The absorptive polarizing member may typically include a resin film (sometimes referred to as an absorptive polarizing film) containing a dichroic material. The thickness of the absorptive polarizing film is, for example, 1 μm or more and 20 μm or less, and may be 2 μm or more and 15 μm or less, 12 μm or less, 10 μm or less, 8 μm or less, or 5 μm or less.

[0059] The absorptive polarizing film may be prepared from a single layer of resin film, or may be prepared using a laminate of two or more layers.

[0060] When preparing from a single-layer resin film, for example, an absorptive polarizing film can be obtained by subjecting a hydrophilic polymer film such as a polyvinyl alcohol (PVA)-based film, a partially formalized PVA-based film, or an ethylene-vinyl acetate copolymer-based partially saponified film to a dyeing treatment with a dichroic substance such as iodine or a dichroic dye, a stretching treatment, etc. Among them, an absorptive polarizing film obtained by dyeing a PVA-based film with iodine and uniaxially stretching it is preferable.

[0061] The dyeing with iodine is 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. The stretching may be carried out after the dyeing treatment or while the dyeing is being carried out. Alternatively, the stretching may be followed by dyeing. If necessary, the PVA film is subjected to a swelling treatment, a crosslinking treatment, a washing treatment, a drying treatment, or the like.

[0062] Examples of the laminate produced using the laminate of two or more layers include a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a laminate of a resin substrate and a PVA-based resin layer formed by coating on the resin substrate. The absorptive polarizing film obtained using a laminate of a resin substrate and a PVA-based resin layer formed by coating on the resin substrate can be produced, for example, by coating a PVA-based resin solution on the resin substrate and drying the resin substrate to form a PVA-based resin layer on the resin substrate to obtain a laminate of the resin substrate and the PVA-based resin layer; and stretching and dyeing the laminate to make the PVA-based resin layer into an absorptive polarizing film. In this embodiment, preferably, a polyvinyl alcohol-based resin layer containing a halide and a polyvinyl alcohol-based resin is formed on one side of the resin substrate. The stretching typically includes immersing the laminate in an aqueous boric acid solution to stretch it. Furthermore, the stretching may further include, as necessary, stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in the aqueous boric acid solution. In addition, in this embodiment, the laminate is preferably subjected to a drying shrinkage treatment in which the laminate is heated while being transported in the longitudinal direction, thereby shrinking the laminate by 2% or more in the width direction. Typically, the manufacturing method of this embodiment includes subjecting the laminate to an air-assisted stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment in this order. By introducing the auxiliary stretching, even when PVA is applied onto a thermoplastic resin, it is possible to increase the crystallinity of PVA, and to achieve high optical properties. At the same time, by increasing the orientation of PVA in advance, problems such as a decrease in the orientation or dissolution of PVA when immersed in water in the subsequent dyeing and stretching steps can be prevented, and high optical properties can be achieved. Furthermore, when the PVA-based resin layer is immersed in a liquid, the disorder of the orientation of polyvinyl alcohol molecules and the decrease in the orientation can be suppressed compared to when the PVA-based resin layer does not contain a halide. This can improve the optical properties of the absorptive polarizing film obtained through treatment steps in which the laminate is immersed in a liquid, such as a dyeing treatment and an underwater stretching treatment. Furthermore, the optical properties can be improved by shrinking the laminate in the width direction through drying shrinkage treatment.The obtained laminate of the resin substrate / absorptive polarizing film may be used as it is (i.e., the resin substrate may be used as the protective layer of the absorptive polarizing film), or an arbitrary appropriate protective layer according to the purpose may be laminated on the peeled surface of the resin substrate peeled from the laminate of the resin substrate / absorptive polarizing film, or on the surface opposite to the peeled surface and used. Details of such a method for manufacturing an absorptive polarizing film are described, for example, in JP-A-2012-73580 and Japanese Patent No. 6470455. The entire descriptions of these publications are incorporated herein by reference.

[0063] The orthogonal transmittance (Tc) of the absorptive polarizing member (absorptive polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and still more preferably 0.05% or less. The single transmittance (Ts) of the absorptive polarizing member (absorptive polarizing film) is, for example, 41.0% to 45.0%, and preferably 42.0% or more. The degree of polarization (P) of the absorptive polarizing member (absorptive polarizing film) is, for example, 99.0% to 99.997%, and preferably 99.9% or more.

[0064] B-6-2. First λ / 4 member The first λ / 4 member 20a preferably exhibits a refractive index characteristic relationship 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, within a range that does not impair the effects of the present invention, ny < nz may occur. The Nz coefficient of the first λ / 4 member is preferably 0.9 to 3, more preferably 0.9 to 2.5, still more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3. The Re(550), wavelength dispersion characteristics, and axial relationship with the polarizing member 10 of the first λ / 4 member are as described in Section A.

[0065] The first λ / 4 member is formed of any appropriate material that can satisfy the above characteristics. The first λ / 4 member can be, for example, a stretched film of a resin film or an alignment solidified layer of a liquid crystal compound.

[0066] Examples of the resin contained in the resin film include polycarbonate-based resins, polyester carbonate-based resins, polyester-based resins, polyvinyl acetal-based resins, polyarylate-based resins, cyclic olefin-based resins, cellulose-based resins, polyvinyl alcohol-based resins, polyamide-based resins, polyimide-based resins, polyether-based resins, polystyrene-based resins, and acrylic-based resins. These resins may be used alone or in combination. Examples of methods for combining include blending and copolymerization. When the first λ / 4 member exhibits reverse dispersion wavelength characteristics, a resin film containing a polycarbonate-based resin or a polyester carbonate-based resin (hereinafter, sometimes simply referred to as a polycarbonate-based resin) may be suitably used.

[0067] Any suitable polycarbonate-based resin can be used as the polycarbonate-based resin. For example, the polycarbonate-based resin contains a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from at least one dihydroxy compound selected from the group consisting of alicyclic diol, alicyclic dimethanol, di-, tri- or polyethylene glycol, and alkylene glycol or spiro glycol. Preferably, the polycarbonate-based resin contains a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, a structural unit derived from an alicyclic dimethanol and / or a structural unit derived from a di-, tri- or polyethylene glycol; more preferably, it contains a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and a structural unit derived from a di-, tri- or polyethylene glycol. The polycarbonate-based resin may contain a structural unit derived from another dihydroxy compound as necessary. Details of polycarbonate-based resins that can be suitably used for the first λ / 4 member and methods for forming the first λ / 4 member are described, for example, in JP 2014-10291 A, JP 2014-26266 A, JP 2015-212816 A, JP 2015-212817 A, and JP 2015-212818 A, and the descriptions in these publications are incorporated herein by reference.

[0068] The thickness of the first λ / 4 member made of a stretched resin film is, for example, 10 μm to 100 μm, preferably 10 μm to 70 μm, and more preferably 20 μm to 60 μm.

[0069] The above-mentioned liquid crystal compound alignment solidified layer is a layer in which the liquid crystal compound is aligned in a predetermined direction within the layer, and the alignment state is fixed. The "alignment solidified layer" is a concept that includes an alignment solidified layer obtained by hardening a liquid crystal monomer as described later. In the first λ / 4 member, typically, rod-shaped liquid crystal compounds are aligned in the slow axis direction of the first λ / 4 member (homogeneous alignment). Examples of rod-shaped liquid crystal compounds include liquid crystal polymers and liquid crystal monomers. The liquid crystal compound is preferably polymerizable. If the liquid crystal compound is polymerizable, the alignment state of the liquid crystal compound can be fixed by aligning the liquid crystal compound and then polymerizing it.

[0070] The alignment solidified layer of the liquid crystal compound (liquid crystal alignment solidified layer) can be formed by performing an alignment treatment on the surface of a predetermined substrate, applying a coating liquid containing a liquid crystal compound to the surface to align the liquid crystal compound in a direction corresponding to the alignment treatment, and fixing the alignment state. Any appropriate alignment treatment can be adopted as the alignment treatment. Specifically, mechanical alignment treatment, physical alignment treatment, and chemical alignment treatment can be mentioned. Specific examples of mechanical alignment treatment include rubbing 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 oblique deposition method and photoalignment treatment. As the treatment conditions of various alignment treatments, any appropriate conditions can be adopted depending on the purpose.

[0071] The alignment of the liquid crystal compound is performed by treating the liquid crystal compound at a temperature at which the liquid crystal compound exhibits a liquid crystal phase according to the type of liquid crystal compound. By performing such temperature treatment, the liquid crystal compound takes on a liquid crystal state and is aligned according to the alignment treatment direction of the substrate surface.

[0072] In one embodiment, the alignment state is fixed by cooling the liquid crystal compound aligned as described above. When the liquid crystal compound is polymerizable or crosslinkable, the alignment state is fixed by subjecting the liquid crystal compound aligned as described above to a polymerization treatment or crosslinking treatment.

[0073] As the liquid crystal compound, any suitable liquid crystal polymer and / or liquid crystal monomer is used. The liquid crystal polymer and the liquid crystal monomer may be used alone or in combination. Specific examples of the liquid crystal compound and the method for producing the liquid crystal alignment solidified layer are described in, for example, JP 2006-163343 A, JP 2006-178389 A, and WO 2018 / 123551 A. The descriptions in these publications are incorporated herein by reference.

[0074] The thickness of the first λ / 4 member constituted by the liquid crystal alignment solidified layer is, for example, 1 μm to 10 μm, preferably 1 μm to 8 μm, more preferably 1 μm to 6 μm, and further preferably 1 μm to 4 μm.

[0075] B-6-3. First positive C plate The thickness direction retardation Rth(550) of the first positive C plate 20b is preferably -50 nm to -300 nm, more preferably -70 nm to -250 nm, further preferably -90 nm to -200 nm, and particularly preferably -100 nm to -180 nm. 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 retardation Re(550) of the first positive C plate is, for example, less than 10 nm.

[0076] The first positive C plate may be formed of any suitable material, but is preferably composed of a film containing a liquid crystal material fixed in homeotropic alignment. The liquid crystal material (liquid crystal compound) that can be homeotropically aligned may be a liquid crystal monomer or a liquid crystal polymer. Specific examples of such liquid crystal compounds and methods for forming the first positive C plate include the liquid crystal compounds and methods for forming the retardation layer described in

[0020] to

[0028] of JP-A-2002-333642. In this case, the thickness of the first positive C plate is preferably 0.5 μm to 5 μm.

[0077] B-6-4. First protective member The first protective member 31 typically includes a substrate. The thickness of the substrate is preferably 5 μm to 80 μm, more preferably 10 μm to 50 μm, and further preferably 15 μm to 40 μm. The substrate may be made of any appropriate film. Examples of materials that are the main components of the film that constitutes the substrate include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, polysulfone-based, polystyrene-based, cycloolefin-based resins such as polynorbornene, polyolefin-based, (meth)acrylic, acetate-based, and other resins. Here, (meth)acrylic refers to acrylic and / or methacrylic.

[0078] The first protective member preferably has a substrate and a surface treatment layer formed on the substrate. The first protective member having the surface treatment layer may be disposed so that the surface treatment layer is located on the front side. Specifically, the surface treatment layer may be located on the outermost surface of the optical laminate. The surface treatment layer may have any appropriate function. For example, from the viewpoint of improving visibility, the surface treatment layer preferably has an anti-reflection function. The thickness of the surface treatment layer is preferably 0.5 μm to 10 μm, more preferably 1 μm to 7 μm, and further preferably 2 μm to 5 μm.

[0079] B-6-5.First adhesive layer The first adhesive layer 41 may be made 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, number, combination, and compounding ratio of monomers forming the base resin of the adhesive, as well as the compounding amount of the crosslinking agent, reaction temperature, reaction time, and the like, an adhesive having desired properties according to the purpose can be prepared. The base resin of the adhesive may be used alone or in combination of two or more kinds. An acrylic resin is preferably used as the base resin. Specifically, the first adhesive layer is preferably made of an acrylic adhesive.

[0080] The first pressure-sensitive adhesive layer has a thickness of, for example, 1 μm or more, preferably 3 μm or more, and for example, 50 μm or less, preferably 30 μm or less.

[0081] B-6-6. First release liner For example, a flexible plastic film may be used as the first release liner 51. Examples of such plastic films include polyethylene terephthalate film, polyethylene film, polypropylene film, and polyester film. The surface of the release liner is preferably coated with a release agent. Specific examples of the release agent include silicone-based release agents, fluorine-based release agents, and long-chain alkyl acrylate-based release agents. The thickness of the release liner (including the thickness of the release agent layer) is, for example, 3 μm or more and, for example, 200 μm or less.

[0082] B-7. Second optical laminate 10 is a schematic cross-sectional view showing an example of the configuration of the second optical laminate. The second optical laminate 200 includes a second phase difference member 22 and a second protective member 32. The second protective member 32 is laminated to the second phase difference member 22 via an adhesive layer (e.g., a pressure-sensitive adhesive layer). The second optical laminate 200 further includes a second pressure-sensitive adhesive layer 42 arranged on the side of the second phase difference member 22 opposite to the side on which the second protective member 32 is arranged. A second release liner 52 is temporarily attached to the surface of the second pressure-sensitive adhesive layer 42. After the second release liner 52 is peeled off, the second optical laminate 200 can be integrated with the first lens unit 16 by the second pressure-sensitive adhesive layer 42.

[0083] In the example shown in FIG. 10, the second phase difference member 22 includes a member (hereinafter also referred to as a "second positive C plate") 22b whose refractive index characteristics show the relationship of nz>nx=ny in addition to the second λ / 4 member 22a. The second phase difference member 22 has a laminated structure of the second λ / 4 member 22a and the second positive C plate 22b. By using the second positive C plate 22b, it is possible to prevent light leakage (for example, light leakage in an oblique direction). As shown in the example, in the second phase difference member 22, it is preferable that the second λ / 4 member 22a is located closer to the second protective member 32 than the second positive C plate 22b. The second λ / 4 member 22a and the second positive C plate 22b are typically laminated via an adhesive layer (for example, an adhesive layer).

[0084] The second λ / 4 member 22a, the second positive C plate 22b, the second protective member 32, the second adhesive layer 42, and the second release liner 52 can be described in the same manner as the first λ / 4 member 20a, the first positive C plate 20b, the first protective member 31, the first adhesive layer 41, and the first release liner 51, respectively.

[0085] The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the above-described embodiment may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiment, a configuration that provides the same effect, or a configuration that can achieve the same purpose. [Industrial Applicability]

[0086] The method for managing the optical laminate according to the embodiment of the present invention can be suitably used in the manufacture of display systems such as VR goggles, for example. [Explanation of symbols]

[0087] 2 display system, 12 display element, 14 reflective polarizing member, 16 first lens portion, 18 half mirror, 20 first phase difference member, 22 second phase difference member, 24 second lens portion

Claims

1. A method for managing a first optical stack including a first λ / 4 component and a second optical stack including a second λ / 4 component, the method comprising: (i) classifying a plurality of the first optical laminates into Na groups each having a different average value of in-plane retardation (wherein the Na groups include a 1a group, a 2a group, and a 3a group which are consecutive in this order when sorted in order of the magnitude of the average value, the maximum value of the in-plane retardation of the first optical laminate in the 2a group is smaller than the maximum value of the in-plane retardation of the first optical laminate in the 1a group, and the minimum value of the in-plane retardation of the first optical laminate in the 2a group is larger than the minimum value of the in-plane retardation of the first optical laminate in the 3a group); (ii) classifying a plurality of the second optical laminates into Nb groups having different average values ​​of in-plane retardation (here, the Nb groups include a 1b group, a 2b group, and a 3b group which are consecutive in this order when arranged in order of the magnitude of the average value, the maximum value of the in-plane retardation of the second optical laminate in the 2b group is smaller than the maximum value of the in-plane retardation of the second optical laminate in the 1b group, and the minimum value of the in-plane retardation of the second optical laminate in the 2b group is larger than the minimum value of the in-plane retardation of the second optical laminate in the 3b group); (iii) matching a combination A of the 1a group and the 1b group and a combination B of the 3a group and the 3b group based on the average value of the in-plane retardation; and (iv) allocating the first optical laminate included in the 2a group and the second optical laminate included in the 2b group to the combination A and / or the combination B such that the difference between the number of the first optical laminate and the number of the second optical laminate in the combination A and / or the combination B is small; (c) a method of administration;

2. The variation in the in-plane retardation of the first optical laminate in each of the Na groups is 0.1 nm to 10 nm, and / or The variation in the in-plane retardation of the second optical laminate in each of the Nb groups is 0.1 nm to 10 nm; The management method according to claim 1 .

3. The maximum value of the in-plane retardation of the first optical laminate in the 2a group is greater than the minimum value of the in-plane retardation of the first optical laminate in the 1a group, and / or The maximum value of the in-plane retardation of the second optical laminate in the 2b group is greater than the minimum value of the in-plane retardation of the second optical laminate in the 1b group; The management method according to claim 1 .

4. The maximum value of the in-plane retardation of the first optical laminate in the 2a group is equal to or less than the average value of the in-plane retardation of the first optical laminate in the 1a group, and / or The maximum value of the in-plane retardation of the second optical laminate in the 2b group is equal to or less than the average value of the in-plane retardation of the second optical laminate in the 1b group. The management method according to claim 1 .

5. The minimum value of the in-plane retardation of the first optical laminate in the 2a group is smaller than the maximum value of the in-plane retardation of the first optical laminate in the 3a group, and / or The minimum value of the in-plane retardation of the second optical laminate in the 2b group is smaller than the maximum value of the in-plane retardation of the second optical laminate in the 3b group. The management method according to claim 1 .

6. The minimum value of the in-plane retardation of the first optical laminate in the 2a group is equal to or greater than the average value of the in-plane retardation of the first optical laminate in the 3a group, and / or The minimum value of the in-plane retardation of the second optical laminate in the 2b group is equal to or greater than the average value of the in-plane retardation of the second optical laminate in the 3b group. The management method according to claim 1 .

7. The number of the first optical laminates included in the 2a group is 50% or more of the total number of the first optical laminates included in the 1a group and the 3a group, and / or The management method according to claim 1 , wherein the number of the second optical laminates included in the 2b group is 50% or more of the total number of the second optical laminates included in the 1b group and the 3b group.

8. Na is an integer from 3 to 10, and / or The Nb is an integer of 3 to 10. The management method according to claim 1 .

9. The variation in in-plane retardation in the plurality of first optical laminates before classification is 1.0 nm to 20 nm, and / or The management method according to claim 1, wherein the variation in in-plane retardation in the plurality of second optical laminates before the classification is 1.0 nm to 20 nm.

10. a display element having a display surface that emits light representing an image forward via a polarizing member; a reflective polarizing member disposed in front of the display element and configured to reflect light emitted from the display element; a first lens portion disposed on an optical path between the display element and the reflective polarizing member; a half mirror disposed between the display element and the first lens portion, the half mirror transmitting light emitted from the display element and reflecting light reflected by the reflective polarizing member toward the reflective polarizing member; a first λ / 4 member disposed on an optical path between the display element and the half mirror; a second λ / 4 member disposed on an optical path between the half mirror and the reflective polarizing member; 1. A method for manufacturing a display system for displaying an image to a user, comprising: A manufacturing method comprising: manufacturing the display system using the first optical stack and the second optical stack that are assigned to the same combination by the management method of any one of claims 1 to 9.

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