KR-20260068067-A - Method of manufacturing a phase difference film, a set of phase difference films, or a lens part or a display system

KR20260068067AKR 20260068067 AKR20260068067 AKR 20260068067AKR-20260068067-A

Abstract

A method for manufacturing a phase difference film, a set of phase difference films, or a lens part or a display system is provided, which can achieve good weight reduction of VR goggles while improving visibility. A method for manufacturing a display system that displays an image to a user comprises integrating a phase difference film (wherein the absolute value of the sum of the phase difference change values RS of each phase difference layer is 3.0 or less, wherein the phase difference change value RS is the slope of an approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions where tensions of 0 kg, 0.5 kg, 1 kg, 1.5 kg, and 2 kg are applied) into a lens part as a λ/4 member.

Inventors

하야시 다이스케
남바라 타쿠야

Assignees

닛토덴코 가부시키가이샤

Dates

Publication Date: 20260513
Application Date: 20240830
Priority Date: 20230920

Claims (13)

A method for manufacturing a display system that displays an image to a user, The above display system, A display element including a display surface that emits light representing an image forward through a polarizing member, and A reflective polarizing member disposed in front of the above-mentioned display element and reflecting light emitted from the above-mentioned display element, and A first lens portion disposed in the optical path between the above-mentioned display element and the above-mentioned reflective polarizing member, wherein the main surface includes a curved surface, and A half mirror disposed between the display element and the first lens portion, which transmits light emitted from the display element and reflects light reflected from the reflective polarizing member toward the reflective polarizing member, and A first phase difference member disposed in the optical path between the above-mentioned display element and the above-mentioned half mirror, comprising a first λ/4 member, and A second phase difference member disposed in the optical path between the half mirror and the reflective polarizing member, and comprising a second λ/4 member. Equipped with, A manufacturing method comprising integrating a phase difference film (wherein the phase difference change value RS is the slope of an approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions of applying tension of 0kg, 0.5kg, 1kg, 1.5kg, and 2kg) with the first lens part as the second phase difference member, wherein the phase difference film comprises two or more phase difference layers including a phase difference layer having an in-plane phase difference Re (550) of 100nm to 190nm, and the absolute value of the sum of the phase difference change values RS of each phase difference layer is 3.0 or less (wherein the phase difference change value RS is the slope of the approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions of applying tension of 0kg, 0.5kg, 1kg, 1.5kg, and 2kg).
In paragraph 1, Preparing two of the above phase difference films, Integrating the above-mentioned phase difference film on one side with the display element as the first phase difference member, and Integrating the above-mentioned phase difference film on the other side with the first lens part as the second phase difference member, A manufacturing method comprising
A method for manufacturing a lens portion used in a display system that displays an image to a user, The above lens part, A reflective polarizing member that reflects light emitted forward from the display surface of a display element displaying an image and passing through a polarizing member and a first λ/4 member, and A first lens portion disposed in the optical path between the above-mentioned display element and the above-mentioned reflective polarizing member, wherein the main surface includes a curved surface, and A half mirror disposed between the display element and the first lens portion, which transmits light emitted from the display element and reflects light reflected from the reflective polarizing member toward the reflective polarizing member, and A second phase difference member is disposed in the optical path between the half mirror and the reflective polarizing member and includes a second λ/4 member, and A manufacturing method comprising integrating a phase difference film (wherein the phase difference change value RS is the slope of an approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions of applying tension of 0kg, 0.5kg, 1kg, 1.5kg, and 2kg) with the first lens part as the second phase difference member, wherein the phase difference film comprises two or more phase difference layers including a phase difference layer having an in-plane phase difference Re (550) of 100nm to 190nm, and the absolute value of the sum of the phase difference change values RS of each phase difference layer is 3.0 or less (wherein the phase difference change value RS is the slope of the approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions of applying tension of 0kg, 0.5kg, 1kg, 1.5kg, and 2kg).
It includes two or more phase difference layers, and The absolute value of the sum of the phase difference change values RS of each of the above phase difference layers is 3.0 or less, and The above phase difference change value RS is the slope of the approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions where tensions of 0kg, 0.5kg, 1kg, 1.5kg, and 2kg are applied, Phase difference film.
In paragraph 4, A phase difference film comprising a phase difference layer A formed of a resin having negative birefringence and having a refractive index characteristic of nz > nx = ny.
In paragraph 5, It further includes other phase difference layers, and A phase difference film in which the ratio of the thickness of the other phase difference layer to the thickness of the phase difference layer A (other phase difference layer / phase difference layer A) is 10 or less.
In paragraph 5, A phase difference film having a fracture elongation of 1% or more at 23°C of the above phase difference layer A.
In paragraph 4, It further includes other phase difference layers, and The in-plane phase difference Re (550) of the above other phase difference layer is 100nm to 160nm, Phase difference film.
In paragraph 4, Phase difference film having a surface smoothness of 0.4 arcmin or less.
In paragraph 4, Phase difference film integrated with a member including a curved surface.
In Paragraph 10, A phase difference film having a radius of curvature of the curved surface of a member including the above curved surface of 20 mm or more.
In paragraph 4, A display element including a display surface that emits light representing an image forward through a polarizing member, and A reflective polarizing member disposed in front of the above-mentioned display element and reflecting light emitted from the above-mentioned display element, and A first lens portion disposed in the optical path between the above-mentioned display element and the above-mentioned reflective polarizing member, wherein the main surface includes a curved surface, and A half mirror disposed between the display element and the first lens portion, which transmits light emitted from the display element and reflects light reflected from the reflective polarizing member toward the reflective polarizing member, and A first phase difference member disposed in the optical path between the above-mentioned display element and the above-mentioned half mirror, comprising a first λ/4 member, and A second phase difference member disposed in the optical path between the half mirror and the reflective polarizing member, and comprising a second λ/4 member. In a display system equipped with, A phase difference film used as the second phase difference member, integrated with the first lens part.
A display element including a display surface that emits light representing an image forward through a polarizing member, and A reflective polarizing member disposed in front of the above-mentioned display element and reflecting light emitted from the above-mentioned display element, and A first lens portion disposed in the optical path between the above-mentioned display element and the above-mentioned reflective polarizing member, wherein the main surface includes a curved surface, and A half mirror disposed between the display element and the first lens portion, which transmits light emitted from the display element and reflects light reflected from the reflective polarizing member toward the reflective polarizing member, and A first phase difference member disposed in the optical path between the above-mentioned display element and the above-mentioned half mirror, comprising a first λ/4 member, and A second phase difference member disposed in the optical path between the half mirror and the reflective polarizing member, and comprising a second λ/4 member. Equipped with, In a display system in which the second phase difference member and the first lens member are integrated, a set of a first phase difference film for constituting the first phase difference member and a second phase difference film for constituting the second phase difference member, The first phase difference film and the second phase difference film each comprise two or more phase difference layers, each comprising a phase difference layer having an in-plane phase difference Re (550) of 100 nm to 190 nm, and the absolute value of the sum of the phase difference change values RS of each phase difference layer is 3.0 or less (wherein the phase difference change value RS is the slope of the approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions where tensions of 0 kg, 0.5 kg, 1 kg, 1.5 kg, and 2 kg are applied). A set of phase difference films.

Description

Method of manufacturing a phase difference film, a set of phase difference films, or a lens part or a display system The present invention relates to a method for manufacturing a phase difference film, a set of phase difference films, a lens part, or a display system. 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 components such as polarizing members and phase difference members are generally used to realize image display and improve image display performance (e.g., see Patent Document 1). Recently, new applications for image display devices are being developed. For example, display-equipped goggles (VR goggles) designed to realize Virtual Reality (VR) are beginning to be commercialized. As the use of VR goggles in various scenarios is being considered, there is a demand for features such as reduced weight and improved visibility. FIG. 1 is a schematic diagram illustrating an example of a method for integrating a member including a phase difference film and a curved surface. FIG. 2 is a schematic cross-sectional view of a phase difference film according to an embodiment of the present invention. Figure 3 is a schematic diagram showing the schematic configuration of an example of a display system for VR goggles. FIG. 4 is a schematic cross-sectional view and a partial enlarged cross-sectional view illustrating the configuration of an example of an integrated member including a phase difference film and a curved surface. FIG. 5 is a schematic cross-sectional view illustrating the configuration of an example of an optical laminate including a phase difference film. Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. In order to make the explanation clearer, the drawings may schematically depict the width, thickness, shape, etc. of each part compared to the embodiments; however, this is merely an example and does not limit the interpretation of the present invention. Furthermore, in the drawings, the same or equivalent elements are given the same reference numerals, and redundant descriptions may be omitted. (Definition of Terms and Symbols) The definitions of terms and symbols in this specification are as follows. (1) Refractive index (nx, ny, nz) 'nx' is the refractive index in the direction where the refractive index in the plane is maximum (i.e., the ground axis direction), 'ny' is the refractive index in the direction perpendicular to the ground axis in the plane (i.e., the true axis direction), and 'nz' is the refractive index in the thickness direction. (2) In-plane phase difference (Re) 'Re(λ)' is the in-plane phase difference measured with light of wavelength λ nm at 23°C. For example, 'Re(550)' is the in-plane phase difference measured with light of wavelength 550 nm at 23°C. Re(λ) can be calculated by the formula: Re(λ)=(nx-ny)×d, where the thickness of the layer (film) is d(nm). (3) Phase difference in the thickness direction (Rth) 'Rth(λ)' is the phase difference in the thickness direction measured with light of wavelength λnm at 23°C. For example, 'Rth(550)' is the phase difference in the thickness direction measured with light of wavelength 550nm at 23°C. Rth(λ) can be calculated by the formula: Rth(λ)=(nx-nz)×d, where the thickness of the layer (film) is d(nm). (4) Nz coefficient The Nz coefficient can be calculated using the formula Nz = Rth/Re. (5) Angle When referring to an angle in this specification, the angle includes both clockwise and counterclockwise directions with respect to the reference direction. Accordingly, for example, '45°' means ±45°. A. Phase difference film A phase difference film according to an embodiment of the present invention comprises two or more (preferably two) phase difference layers. A phase difference film is provided in which the absolute value of the sum of the phase difference change values RS of each phase difference layer is 3.0 or less. In one embodiment, the phase difference film comprises a phase difference layer in which the in-plane phase difference Re (550) is 100 nm to 190 nm. The phase difference film can be suitably used in an integrated state with a member including a curved surface. The phase difference change value 'RS' is the slope of an approximate straight line of the in-plane phase difference Re (550) of the phase difference layer measured under conditions where tension of 0 kg, 0.5 kg, 1 kg, 1.5 kg, and 2 kg is applied, and can serve as an indicator of the degree of change in the in-plane phase difference when tension is applied to the phase difference film (as a result, the phase difference layer). Specifically, a small RS means that it is difficult for the in-plane phase difference to change when tension is applied to the phase difference layer. When integrated with a member i