Polarizer Structure

Abstract

To provide a polarizer structure that improves the color shift problem at frontal viewing angles or large viewing angles that occurs in conventional polarizer structures formed by a roll-to-roll lamination method. The polarizer structure (100) of the present invention includes a first polarizer (1) that is an absorptive or reflective polarizer, a second polarizer (3) that is an absorptive or reflective polarizer, and a waveplate structure (2) disposed between the first and second polarizers. The waveplate structure includes a first waveplate (21) and a second waveplate (22). The first waveplate is a positive-C waveplate or a negative-C waveplate. The included angle between the first transmission axis direction (T1) of the first polarizer and the second transmission axis direction (T2) of the second polarizer is a first angle (A1). After a light ray passes through the second waveplate of the waveplate structure, the first angle is converted to a second angle (A1) that is 90% to 110% of the second angle.

Description

[Technical Field]

[0001] The present invention relates to a polarizer structure, and more particularly to a polarizer structure formed by a roll-to-roll lamination process. [Background technology]

[0002] Conventional polarizer structures formed by roll-to-roll lamination generally have room for improvement in their optical properties. For example, when conventional polarizer structures are applied to displays, they are prone to color shift issues at frontal or large viewing angles. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention discloses a polarizer structure, which is primarily used to improve the color shift problem at frontal or large viewing angles of conventional polarizer structures formed by roll-to-roll lamination. [Means for solving the problem]

[0004] One embodiment of the present invention provides a polarizer structure including a first polarizer that is an absorptive or reflective polarizer, a second polarizer that is an absorptive or reflective polarizer, and a wave plate structure disposed between the first and second polarizers, wherein the wave plate structure includes a first wave plate and a second wave plate, the first wave plate being a positive C wave plate or a negative C wave plate, the included angle between the first transmission axis direction of the first polarizer and the second transmission axis direction of the second polarizer being a first angle, and a light ray passing through the second wave plate of the wave plate structure being converted to a second angle, the first angle being within a range of 90% to 110% of the second angle. [Effects of the Invention]

[0005] To summarize the above, one of the beneficial effects of the present invention is that the polarizer structure provided by the present invention effectively overcomes the color shift problem at front-on viewing angles or large viewing angles of conventional polarizer structures formed by roll-to-roll lamination. This problem is solved by the following technical solutions: "the included angle between the first transmission axis direction of the first polarizer and the second transmission axis direction of the second polarizer is a first angle, and after a light ray passes through the second wave plate of the wave plate structure, it is converted to a second angle, the first angle being within a range of 90% to 110% of the second angle"; and "the wave plate structure includes a first wave plate and a second wave plate, and the first wave plate is a positive-C wave plate or a negative-C wave plate." [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view of a polarizer structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is a flowchart of a method for manufacturing a polarizer structure according to an embodiment of the present invention. [Figure 3] FIG. 3 is a schematic diagram of a preparatory step of the manufacturing method of the polarizer structure according to the embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram of a wave plate installation step in the manufacturing method of the polarizer structure according to the embodiment of the present invention. [Figure 5] FIG. 5 is a schematic diagram of a roll-to-roll lamination process in a method for manufacturing a polarizer structure according to an embodiment of the present invention. [Figure 6] FIG. 6 is an exploded schematic diagram of a polarizer structure according to another embodiment of the present invention. [Figure 7] FIG. 7 is an exploded schematic diagram of a polarizer structure according to another embodiment of the present invention. [Figure 8] FIG. 8 is an exploded schematic view of a polarizer structure according to another embodiment of the present invention. [Figure 9] FIG. 9 is an exploded schematic diagram of a polarizer structure according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0007] To better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the drawings, which are provided for reference and explanation only and are not intended to limit the present invention.

[0008] The following describes the implementation of the "polarizer structure" according to the present invention through specific embodiments, so that those skilled in the art can understand the advantages and effects of the present invention based on the content disclosed herein. The present invention can be implemented or applied in other different specific embodiments, and various modifications and changes can be made to the details herein based on different perspectives and applications without departing from the concept of the present invention. Please note in advance that the accompanying drawings of the present invention are merely schematic illustrations and are not drawn to actual size. The technical content of the present invention will be described in more detail based on the following embodiments, but the disclosed content should not be construed as limiting the scope of protection of the present invention.

[0009] It should be understood that although the present specification may use terms such as "first," "second," and "third" to describe various elements or signals, these elements or signals are not limited by these terms. These terms are primarily used to distinguish one element from another element or signal from another signal. Furthermore, the term "or" used in the present specification may include any one or more combinations of the associated listed items, depending on the actual situation.

[0010] [Method for manufacturing polarizer structure] Referring to Figures 1 and 2, Figure 1 is a perspective view of a polarizer structure according to an embodiment of the invention, and Figure 2 is a flowchart of a method for manufacturing a polarizer structure according to an embodiment of the invention. This embodiment of the invention provides a method for manufacturing a polarizer structure. The method includes a pre-positioning step S110, a wave plate installation step S120, and a roll-to-roll lamination step S130. Of course, the method for manufacturing the polarizer structure may include other steps, and the invention is not limited thereto.

[0011] 3 to 5, FIG. 3 is a schematic diagram of a preparatory step of a manufacturing method of a polarizer structure according to an embodiment of the present invention, FIG. 4 is a schematic diagram of a wave plate installation step of the manufacturing method of a polarizer structure according to an embodiment of the present invention, and FIG. 5 is a schematic diagram of a roll-to-roll lamination step of the manufacturing method of a polarizer structure according to an embodiment of the present invention. In the preparatory step S110, a first polarizer 1 is provided. The first polarizer 1 is an absorptive polarizer or a reflective polarizer. In the wave plate installation step S120, a wave plate structure 2 is installed on the first polarizer 1. In the roll-to-roll lamination step S130, a second polarizer 3 is laminated to the wave plate structure 2 using a roll-to-roll method, sandwiching the wave plate structure 2 between the first polarizer 1 and the second polarizer 3 to form polarizer structure 100.

[0012] The wave plate structure 2 includes a first wave plate 21 and a second wave plate 22. The first wave plate 21 is a positive C wave plate or a negative C wave plate. The second wave plate 22 may be, for example, a half-wave plate 22a (shown in FIGS. 6 and 8) or two quarter-wave plates 22b (shown in FIGS. 7 and 9). In this embodiment, the second wave plate 22 is located between the first wave plate 21 and the first polarizer 1, so that light passes through the first polarizer 1, the second wave plate 22, the first wave plate 21, and the second polarizer 3 in that order. However, the present invention does not limit the positions of the first wave plate 21 and the second wave plate 22 in the wave plate structure 2. In other embodiments not shown in the present invention, the first wave plate 21 may be located between the second wave plate 22 and the first polarizer 1.

[0013] 6 to 9, which are exploded schematic diagrams of polarizer structures according to other embodiments of the present invention. The first polarizer 1 defines a first transmission axis direction T1, which is the extension direction of the transmission axis of the first polarizer 1. The second polarizer 3 defines a second transmission axis direction T2, which is the extension direction of the transmission axis of the second polarizer 3.

[0014] The angle between the first transmission axis direction T1 of the first polarizer 1 and the second transmission axis direction T2 of the second polarizer 3 is a first angle A1, which is converted to a second angle A2 after the light ray passes through the wave plate structure 2, and the first angle A1 is within a range of 90% to 110% of the second angle A2. Preferably, the first angle A1 is within a range of 95% to 105% of the second angle A2. More preferably, the first angle A1 is approximately equal to the second angle A2. The second angle A2 may be considered to be the angle between a first vibration direction S1 of the light ray before it enters the wave plate structure 2 and a second vibration direction S2 of the light ray after it exits the wave plate structure 2.

[0015] More specifically, after a light ray passes through the transmission axis of the first polarizer 1, it is converted to the second angle A2 by the second wave plate 22 of the wave plate structure 2, allowing the light ray to pass through the transmission axis of the second polarizer 3. Thus, in the roll-to-roll bonding step S130, the second polarizer 3 can be directly bonded to the first polarizer 1 by a roll-to-roll method, and there is no need to convert either the first polarizer 1 or the second polarizer 3.

[0016] In other words, if the manufacturing method of the polarizer structure does not include the wave plate installation step S120, the light beam that passes through the transmission axis of the first polarizer 1 cannot effectively pass through the transmission axis of the second polarizer 3. In such a case, the first polarizer 1 and the second polarizer 3 cannot be bonded together using the roll-to-roll method, and it is necessary to cut the first polarizer 1 and the second polarizer 3 into sheets, and then convert one of the first polarizer 1 and the second polarizer 3 before bonding them together.

[0017] In this embodiment, the first angle A1 is in the range of 80 to 100 degrees, and the second angle A2 is in the range of 80 to 100 degrees. Preferably, the first angle A1 is in the range of 85 to 95 degrees, and the second angle A2 is in the range of 85 to 95 degrees. More preferably, the first angle A1 is approximately 90 degrees, and the second angle A2 is approximately 90 degrees.

[0018] In the wave plate installation step S120, the wave plate structure 2 installed on the first polarizer 1 may include one half-wave plate 22a (shown in FIGS. 6 and 8), or may include two quarter-wave plates 22b (shown in FIGS. 7 and 9). It should be noted that as long as the wave plate structure 2 can deflect the light beam at the second angle A2, the wave plate structure 2 is not limited to including one half-wave plate 22a or two quarter-wave plates 22b.

[0019] The polarizer structure 100 may define a vertical direction MD and a horizontal direction TD, and the arrangement relationship between the vertical direction MD and the horizontal direction TD of the polarizer structure 100 and the first transmission axis direction T1 of the first polarizer 1 and the second transmission axis direction T2 of the second polarizer 3 can be exemplified as follows: The first transmission axis direction T1 of the first polarizer 1 is parallel to the longitudinal direction MD (shown in Figures 6 and 7) of the polarizer structure 100, and the second transmission axis direction T2 of the second polarizer 3 is parallel to the transverse direction TD (shown in Figures 6 and 7) of the polarizer structure 100, or the first transmission axis direction T1 of the first polarizer 1 is perpendicular to the longitudinal direction MD (shown in Figures 8 and 9) of the polarizer structure 100, and the second transmission axis direction T2 of the second polarizer 3 is perpendicular to the transverse direction TD (shown in Figures 8 and 9) of the polarizer structure 100.

[0020] Specifically, if the first polarizer 1 used in the pre-installation step S110 is the reflective polarizer, the second polarizer 3 used in the roll-to-roll bonding step S130 can be the absorbing polarizer, and if the first polarizer 1 is the absorbing polarizer, the second polarizer 3 used in the roll-to-roll bonding step S130 can be the reflective polarizer.

[0021] It should be noted that by placing the first wave plate 21 (i.e., the positive C wave plate or the negative C wave plate) between the first polarizer 1 and the second polarizer 3, the color shift problem at a viewing angle (e.g., 0 degrees) or a large viewing angle (e.g., greater than 60 degrees) from the front of the polarizer structure 100 can be effectively avoided.

[0022] Specifically, in one embodiment, the first wave plate 21 can be the positive C wave plate. The in-plane retardation (R0) of the positive C wave plate is in the range of -50 nm to 50 nm, and the out-of-plane retardation (Rth) of the positive C wave plate is in the range of 0 nm to -600 nm, but the present invention is not limited thereto. Preferably, the in-plane retardation (R0) of the positive C wave plate is in the range of -40 nm to 40 nm, and the out-of-plane retardation (Rth) of the positive C wave plate is in the range of 0 nm to -450 nm, but the present invention is not limited thereto. More preferably, the in-plane retardation (R0) of the positive C wave plate is in the range of -30 nm to 30 nm, and the out-of-plane retardation (Rth) of the positive C wave plate is in the range of 0 nm to -400 nm.

[0023] In this embodiment, the in-plane retardation (R0) of the second wave plate 22 is in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the second wave plate 22 is in the range of 0 nm to 480 nm. Preferably, the in-plane retardation (R0) of the second wave plate 22 is in the range of 200 nm to 280 nm, and the out-of-plane retardation (Rth) of the second wave plate 22 is in the range of 0 nm to 440 nm, but the present invention is not limited thereto.

[0024] In this way, depending on the in-plane retardation (R0) and out-of-plane retardation (Rth) of the first wave plate 21 (i.e., the positive C wave plate) and the in-plane retardation (R0) and out-of-plane retardation (Rth) of the second wave plate 22, the in-plane retardation (R0) of the wave plate structure 2 including the first wave plate 21 (i.e., the positive C wave plate) and the second wave plate 22 can be in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the wave plate structure 2 can be in the range of -120 nm to 120 nm, but the present invention is not limited thereto. Preferably, the in-plane retardation (R0) of the wave plate structure 2 is in the range of 200 nm to 280 nm, and the out-of-plane retardation (Rth) of the wave plate structure 2 is in the range of -100 nm to 100 nm.

[0025] In one embodiment, the first wave plate 21 may be the negative C wave plate. The in-plane retardation (R0) of the negative C wave plate is in the range of -50 nm to 50 nm, and the out-of-plane retardation (Rth) of the negative C wave plate is in the range of 0 nm to 120 nm. Preferably, the in-plane retardation (R0) of the negative C wave plate is in the range of -40 nm to 40 nm, and the out-of-plane retardation (Rth) of the negative C wave plate is in the range of 0 nm to 100 nm, but the present invention is not limited thereto. More preferably, the in-plane retardation (R0) of the negative C wave plate is in the range of -30 nm to 30 nm, and the out-of-plane retardation (Rth) of the negative C wave plate is in the range of 0 nm to 80 nm.

[0026] In this embodiment, the in-plane retardation (R0) of the second wave plate 22 is in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the second wave plate 22 is in the range of 0 nm to 480 nm. Preferably, the in-plane retardation (R0) of the second wave plate 22 is in the range of 200 nm to 280 nm, and the out-of-plane retardation (Rth) of the second wave plate 22 is in the range of 0 nm to 440 nm, but the present invention is not limited thereto.

[0027] Thus, depending on the in-plane retardation (R0) and out-of-plane retardation (Rth) of the first wave plate 21 (i.e., the negative C wave plate) and the in-plane retardation (R0) and out-of-plane retardation (Rth) of the second wave plate 22, the in-plane retardation (R0) of the wave plate structure 2 including the first wave plate 21 (i.e., the negative C wave plate) and the second wave plate 22 is in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the wave plate structure 2 is in the range of -120 nm to 120 nm, but the present invention is not limited thereto. Preferably, the in-plane retardation (R0) of the wave plate structure 2 is in the range of 200 nm to 280 nm, and the out-of-plane retardation (Rth) of the wave plate structure 2 is in the range of -100 nm to 100 nm.

[0028] [Polarizer structure] 1 and 6 to 9, the present invention further provides a polarizer structure 100. The polarizer structure 100 can be fabricated by the polarizer structure fabrication method described above, but the present invention is not limited thereto. The polarizer structure 100 includes a first polarizer 1, a second polarizer 3, and a wave plate structure 2 disposed between the first polarizer 1 and the second polarizer 3.

[0029] The first polarizer 1 is an absorptive polarizer or a reflective polarizer, and the second polarizer 3 is an absorptive polarizer or a reflective polarizer. The in-plane retardation (R0) of the waveplate structure 2 is in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the waveplate structure 2 is in the range of -120 nm to 120 nm.

[0030] The wave plate structure 2 includes a first wave plate 21 and a second wave plate 22, where the first wave plate 21 is a positive C wave plate or a negative C wave plate, and the second wave plate 22 can be one half wave plate 22a (as shown in Figures 6 and 8) or two quarter wave plates 22b (as shown in Figures 7 and 9).

[0031] In one embodiment, the first wave plate 21 may be the positive C wave plate, wherein the in-plane retardation (R0) of the positive C wave plate is in the range of −50 nm to 50 nm, and the out-of-plane retardation (Rth) of the positive C wave plate is in the range of 0 nm to −600 nm.

[0032] In one embodiment, the first wave plate 21 may be the negative C wave plate, which has an in-plane retardation (R0) in the range of −50 nm to 50 nm and an out-of-plane retardation (Rth) in the range of 0 nm to 120 nm.

[0033] The in-plane retardation (R0) of the second wave plate 22 is in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the second wave plate 22 is in the range of 0 nm to 480 nm.

[0034] The angle between the first transmission axis direction T1 of the first polarizer 1 and the second transmission axis direction T2 of the second polarizer 3 is a first angle A1, which is converted to a second angle A2 after the light ray passes through the second wave plate 22 of the wave plate structure 2, and the first angle A1 is in the range of 90% to 110% of the second angle A2. Preferably, the first angle A1 is in the range of 80 degrees to 100 degrees, and the second angle A2 is in the range of 80 degrees to 100 degrees.

[0035] The above disclosure is merely a preferred embodiment of the present invention, and the scope of the claims of the present invention is not limited thereto. Therefore, any equivalent technical modifications made by utilizing the contents of the specification and drawings of the present invention are included in the scope of the utility model registration claims of the present invention. [Industrial Applicability]

[0036] [Beneficial Effects of the Invention] One of the beneficial effects of the present invention is that the polarizer structure provided by the present invention effectively overcomes the color shift problem at front-on viewing angles or large viewing angles of conventional polarizer structures formed by roll-to-roll lamination. This problem is solved by the following technical solutions: "the included angle between the first transmission axis direction of the first polarizer and the second transmission axis direction of the second polarizer is a first angle, and after a light ray passes through the second wave plate of the wave plate structure, it is converted to a second angle, the first angle being within a range of 90% to 110% of the second angle"; and "the wave plate structure includes a first wave plate and a second wave plate, and the first wave plate is a positive-C wave plate or a negative-C wave plate." [Explanation of symbols]

[0037] 100 Polarizer Structure 1 First Polarizer 2 Wave plate structure 21 First wave plate 22 Second wave plate 22a Half-wave plate 22b Quarter-wave plate 3 Second Polarizer A1 First angle A2 Second angle MD vertical direction TD Lateral T1 First transmission axis direction T2 Second transmission axis direction S1 First vibration direction S2 Second vibration direction S110 Pre-loading process S120 Wave plate installation process S130 Roll-to-roll lamination process

Claims

1. a first polarizer that is an absorptive polarizer or a reflective polarizer; a second polarizer that is an absorptive polarizer or a reflective polarizer; a waveplate structure disposed between the first polarizer and the second polarizer; Including, the wave plate structure includes a first wave plate and a second wave plate, the first wave plate being a positive C wave plate or a negative C wave plate; an included angle between a first transmission axis direction of the first polarizer and a second transmission axis direction of the second polarizer has a first angle, and after a light ray passes through the second wave plate of the wave plate structure, the light ray is converted to a second angle, and the first angle is within a range of 90% to 110% of the second angle; A polarizer structure characterized by:

2. the first wave plate is the positive C wave plate, and the in-plane retardation (R0) of the positive C wave plate is in the range of −50 nm to 50 nm, and the out-of-plane retardation (Rth) of the positive C wave plate is in the range of 0 nm to −600 nm; 2. The polarizer structure of claim 1.

3. The first wave plate is the negative C wave plate, and the in-plane retardation (R0) of the negative C wave plate is in the range of −50 nm to 50 nm, and the out-of-plane retardation (Rth) of the negative C wave plate is in the range of 0 nm to 120 nm.

2. The polarizer structure of claim 1.

4. The in-plane retardation (R0) of the second wave plate is in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the second wave plate is in the range of 0 nm to 480 nm.

2. The polarizer structure of claim 1.

5. The in-plane retardation (R0) of the wave plate structure is in the range of 180 nm to 300 nm, and the out-of-plane retardation (Rth) of the wave plate structure is in the range of −120 nm to 120 nm.

2. The polarizer structure of claim 1.

6. the first angle is in the range of 80 degrees to 100 degrees, and the second angle is in the range of 80 degrees to 100 degrees; 2. The polarizer structure of claim 1.

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