KR-20260066063-A - Method of manufacturing a phase difference film, a phase difference film segment, a set of phase difference films, or a lens part or a display system

KR20260066063AKR 20260066063 AKR20260066063 AKR 20260066063AKR-20260066063-A

Abstract

A method for manufacturing a display system (10) for displaying an image to a user, wherein the display system (10) comprises: a display element (12) including a display surface that emits light representing an image forward through a polarizing member; a reflective polarizing member (14) disposed in front of the display element (12) and reflecting light emitted from the display element (12); a first lens part (16) disposed on the optical path between the display element (12) and the reflective polarizing member (14) and having a curved main surface; a half mirror (18) disposed between the display element (12) and the first lens part (16) and transmitting light emitted from the display element (12) and reflecting light reflected from the reflective polarizing member (14) toward the reflective polarizing member (14); a first λ/4 member (20) disposed on the optical path between the display element (12) and the half mirror (18); and the half A manufacturing method is provided comprising integrating a second λ/4 member (22) disposed in the optical path between the mirror (18) and the reflective polarizing member (14), a phase difference film having an in-plane phase difference Re (550) of 100 nm to 190 nm and an absolute value of a phase difference change value RS of 2.0 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 film measured under conditions where tensions of 0 kg, 0.5 kg, 1 kg, 1.5 kg, and 2 kg are applied) with the first lens part (16) as the second λ/4 member (22).

Inventors

남바라 타쿠야
하야시 다이스케

Assignees

닛토덴코 가부시키가이샤

Dates

Publication Date: 20260512
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, having a curved main 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 λ/4 member disposed in the optical path between the above-mentioned display element and the above-mentioned half mirror, and A second λ/4 member disposed in the optical path between the half mirror and the reflective polarizing member. Equipped with, A manufacturing method comprising integrating a phase difference film (wherein phase difference Re (550) is 100 nm to 190 nm and the absolute value of the phase difference change value RS is 2.0 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 film measured under conditions of applying tension of 0 kg, 0.5 kg, 1 kg, 1.5 kg, and 2 kg) with the first lens part as the second λ/4 member.
In paragraph 1, Preparing two of the above phase difference films, Integrating the phase difference film on one side with the display element as the first λ/4 member, and Integrating the phase difference film on the other side with the first lens part as the second λ/4 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, having a curved main 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 λ/4 member disposed in the optical path between the half mirror and the reflective polarizing member. Equipped with, A manufacturing method comprising integrating a phase difference film (wherein phase difference Re (550) is 100 nm to 190 nm and the absolute value of the phase difference change value RS is 2.0 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 film measured under conditions of applying tension of 0 kg, 0.5 kg, 1 kg, 1.5 kg, and 2 kg) with the first lens part as the second λ/4 member.
The in-plane phase difference Re(550) is 100nm to 190nm, and The absolute value of the phase difference change value RS is 2.0 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 above phase difference film 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 in which the in-plane phase differences Re(450), Re(550), and Re(650) satisfy the following relationships (i) to (iii); (i) 100nm<Re(550)<160nm, (ii) Re(450)/Re(550)<1.1, (iii) Re(650)/Re(550)>0.9.
In paragraph 4, A phase difference film having a dimensional change rate of 0.02% or less before and after heat treatment at 85℃ for 500 hours.
In paragraph 4, A phase difference film in which the absolute value of the difference in in-plane phase difference Re (550) before and after heat treatment at 85℃ for 500 hours is 3.5 nm or less.
In paragraph 4, Phase difference film integrated with a member having a curved surface.
In paragraph 8, A phase difference film having a radius of curvature of 20 mm or more on the above-mentioned curved surface.
In paragraph 4, A phase difference film in which, when integrated with a member having a curved surface with a radius of 32.5 mm and a radius of curvature of 75 mm, the absolute value of the difference between the in-plane phase difference Re (550) of the center and the in-plane phase difference Re (550) of the part other than the center is 10 nm or less.
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, having a curved main 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 λ/4 member disposed in the optical path between the above-mentioned display element and the above-mentioned half mirror, and A second λ/4 member disposed in the optical path between the half mirror and the reflective polarizing member. In a display system equipped with, A phase difference film used as the second λ/4 member, integrated with the first lens part.
Having a curved surface, A phase difference film piece in which the absolute value of the difference between the in-plane phase difference Re (550) of the central part of the curved surface and the in-plane phase difference Re (550) of the part other than the central part is 10 nm or less.
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, having a curved main 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 λ/4 member disposed in the optical path between the above-mentioned display element and the above-mentioned half mirror, and A second λ/4 member disposed in the optical path between the half mirror and the reflective polarizing member. Equipped with, In a display system in which the second λ/4 member and the first lens member are integrated, a set of a first phase difference film for constituting the first λ/4 member and a second phase difference film for constituting the second λ/4 member, The first phase difference film and the second phase difference film are each phase difference films having an in-plane phase difference Re (550) of 100 nm to 190 nm and an absolute value of a phase difference change value RS of 2.0 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 film measured under conditions where tensions of 0 kg, 0.5 kg, 1 kg, 1.5 kg, and 2 kg are applied), and The absolute value of the difference between the in-plane phase difference Re (550) of the first phase difference film and the in-plane phase difference Re (550) of the second phase difference film is 5 nm or less, A set of phase difference films.

Description

Method of manufacturing a phase difference film, a phase difference film segment, a set of phase difference films, or a lens part or a display system The present invention relates to a phase difference film, a phase difference film segment, a set of phase difference films, or a method for manufacturing a lens portion 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 instance, 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 cross-sectional view illustrating an example of a method for integrating a phase difference film and a member having a curved surface. FIG. 2(a) is a schematic cross-sectional view illustrating a method for measuring ellipticity in a state where a phase difference film and a member having a curved surface are integrated, and FIG. 2(b) is a schematic view of the state of FIG. 2(a) when viewed from the side of the phase difference film. 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 product of a phase difference film and a member having 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. Figure 6 is a figure illustrating a method for measuring the deviation of thickness. Figure 7 is a figure illustrating the method for measuring the ISC value. 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 According to one aspect of the present invention, a phase difference film is provided in which the absolute value of the phase difference change value RS is 2.0 or less. The phase difference film can be suitably used in an integrated state with a member having 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 film 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. Specifically, a small absolute value of RS means that it is difficult for the