Light Control Film

Abstract

This specification discloses a light control film and a display device to which the light control film is applied. The light control film, when applied to a display device, enables precise control of the light output angle, ensuring high transmittance, high brightness, and excellent resolution within the light output angle, and blocking unwanted light that can cause defects such as ghosts or moire. Even when applied to an OLED display, the light control film exhibits the above-mentioned performance without causing defects such as stripes that are noticeable to a viewer. This specification also discloses a display device to which the light control film is applied.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0180438 dated December 21, 2022, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present specification discloses a light control film and a display device to which the light control film is applied. [Background technology]

[0003] Light control film, also known as light collimating film, is designed to adjust the transmittance of light in a display device and to control the direction of light output.

[0004] Known display devices include LCDs (Liquid Crystal Displays) and OLEDs (Organic Light Emitting Diodes). These display devices are generally designed to ensure a wide viewing angle. However, when viewing a display device in a public place, for example, it may be necessary to prevent the screen of the display device from being exposed to people around. In addition, in the case of an in-vehicle display, it is necessary to adjust the viewing angle and / or the light output direction of the display depending on the display's position, taking into consideration the impact on the driver and the convenience of passengers.

[0005] In the above applications, the light control film can be used to adjust the direction or angle of light emission and to adjust the transmittance of light.

[0006] Various types of light control films are known. These films typically include a light-transmitting film having a plurality of parallel grooves and a material that absorbs light present in the grooves (for example, the view angle control sheet of Patent Document 1).

[0007] Such light control films are required to precisely control the light output angle, ensure high transmittance within the light output angle, high brightness and excellent resolution, and block unwanted light that causes defects known as ghosts or moire.

[0008] In addition to the above-mentioned properties generally required for light control films, as the types of displays become more diverse, additional properties may be required.

[0009] Most of the light control films known to date are designed for LCDs.

[0010] In the case of an LCD, the light control film is disposed between the liquid crystal panel and the backlight. In this manner, in an LCD, the light control film is disposed relatively inward with respect to the screen from which the image is projected, and is disposed adjacent to the backlight that generates strong light. In addition to the light control film, a diffusion film, a prism film, etc. are also present between the liquid crystal panel and the backlight.

[0011] Therefore, in the case of an LCD, even if a light control film is applied, the viewer cannot perceive defects such as unwanted stripes caused by the light control film.

[0012] In the case of an OLED (Organic Light Emitting Diode) display, a polarizing layer is usually present on the OLED panel, and the surface on which the polarizing layer is present is the surface on which the screen is displayed.

[0013] When a light control film is applied to an OLED display, it is typically disposed between the OLED panel and a polarizing layer, or on the side of the polarizing layer opposite the OLED panel.

[0014] As such, in an OLED display, the light control film is located relatively close to the viewer. Also, in the case of an OLED, there is no element that emits strong light, such as an LCD backlight, as a self-emitting element. Therefore, when a light control film is applied to an OLED display, defects such as unwanted stripes caused by the light control film can be easily recognized by the viewer. [Prior art documents] [Patent documents]

[0015] [Patent Document 1] Patent Publication No. 2006-171701 Summary of the Invention [Problem to be solved by the invention]

[0016] This specification discloses a light control film and a display device to which the light control film is applied. The purpose of this specification is to disclose a light control film that can control the light output angle in a display device, ensure high transmittance, high brightness, and excellent resolution within the light output angle, and does not induce defects such as ghosts or moire.

[0017] The present specification aims to disclose the content that the light control film can exhibit the above performance even when applied to an OLED display, while preventing defects such as stripes that can be recognized by a viewer from occurring due to the light control film.

[0018] The present specification discloses a display device to which the light control film is applied. [Means for solving the problem]

[0019] In the present specification, when a physical property mentioned is affected by the measurement temperature, the physical property is measured at room temperature unless otherwise specified.

[0020] The term "room temperature" refers to a natural temperature that is neither heated nor cooled, and can mean, for example, any temperature within the range of about 10°C to 30°C, or a temperature of about 23°C or about 25°C.

[0021] In this specification, unless otherwise specified, temperatures are in °C.

[0022] In this specification, the terms vertical, parallel, perpendicular, and horizontal, as well as specific numerical values ​​of angles, used to define angles, should be interpreted taking into account manufacturing errors, etc. Therefore, the terms and numerical values ​​of angles refer to substantially vertical, parallel, perpendicular, or horizontal and the numerical values ​​of the angles within a range that does not impair the intended effect. The ranges of vertical, parallel, perpendicular, or horizontal values ​​include errors such as manufacturing errors or variations. For example, each of the above cases may include an error of approximately ±3 degrees, an error of approximately ±2 degrees, an error of approximately ±1 degree, an error of approximately ±0.8 degrees, an error of approximately ±0.6 degrees, or an error of approximately ±0.4 degrees.

[0023] Unless otherwise specified, the angle formed by two directions or sides referred to in this specification may be the smaller of the angles measured clockwise and counterclockwise from either one of the two directions or sides. Therefore, unless otherwise specified, angles referred to in this specification are positive numbers. In some cases, to indicate the measurement direction between angles measured clockwise or counterclockwise, one of the angles measured clockwise and the angle measured counterclockwise may be expressed as a positive number and the other angle may be expressed as a negative number.

[0024] In this specification, unless otherwise specified, the unit of angle is degrees.

[0025] In this specification, unless otherwise specified, the reference wavelength for refractive index is about 589 nm.

[0026] This specification discloses a light control film.

[0027] The light control film includes a body having grooves formed therein and a filler material present in the grooves of the body.

[0028] FIG. 1 is an exemplary cross-sectional view of a light control film (100) including the body and filler material (200).

[0029] As shown in FIG. 1, the body of the light control film (100) has a first surface (1001) and a second surface (1002) opposite to the first surface (1001). When the light control film is applied to a display device, one of the first and second surfaces (1001, 1002) can be a light input surface, and the other can be a light output surface. The first and second surfaces (1001, 1002) can be formed substantially parallel to each other. For example, in the cross section of the light control film, the angle formed between the first surface (1001) and the second surface (1002) can be in the range of approximately 0 to 10 degrees.

[0030] As shown in FIG. 1, a plurality of grooves (1003) extending in a direction toward the second surface (1002) are formed on the first surface (1001) of the body of the light control film (100).

[0031] A filler material (200) is present inside the grooves (1003), and the filler material includes a light-absorbing material. With this structure, the filler material (200) filled in the body and the grooves (1003) can form transmissive and absorptive regions that alternate in the cross section along the direction in which the first or second surface (1001 or 1002) is formed.

[0032] For example, in the first and second surfaces or the body of the light control film, areas where the filler material (200) is not present can form transmissive areas, and areas where the filler material (200) is present can form absorptive areas.

[0033] The absorption region can absorb or block light incident on the light input surface that deviates from the intended exit angle, or change the direction of the light by total reflection or the like.

[0034] In one example, as shown in Figure 2, in the light control film (100), when the first surface (1001) of the main body is observed in the normal direction to the first surface (1001), the groove (1003) may be formed to exhibit a linear shape.

[0035] In the light control film, the grooves (1003) are filled with the filling material (200) at an excellent filling rate, and the filling material is uniformly filled into each of the plurality of grooves (1003).

[0036] Conventional light control films are also constructed by filling the grooves of a main body having grooves with a filler substance containing a light-absorbing material, but as long as the grooves are filled with the filler substance to a certain level or more, no attention is paid to the specific filling rate, and little consideration is given to the uniformity of the filler substance filled into each of the multiple grooves.

[0037] This is because conventional light control films were primarily designed for LCDs, and so even if the filling rate of the filler material was low or there was some degree of non-uniformity, the resulting poor appearance was not noticeable to the viewer.

[0038] However, when the light control film is applied to an OLED display or the like, the filling rate and filling uniformity of the filling material have an important relationship with whether or not a viewer can recognize defects caused by the light control film.

[0039] In the light control film, the average and standard deviation of the depth of the areas not filled with the filling material in the plurality of grooves filled with the filling material can be controlled.

[0040] The depth of the region unfilled with the filling material will be explained with reference to Figure 3. Figure 3 is a more enlarged view of a cross section of one of the grooves (1003) of the light control film (100) of Figure 1.

[0041] As shown in Figure 3, the depth of the region unfilled with the filling material (200) is the shortest distance (D1, D2, etc. in Figure 3) from the first surface (1001) of the body to the filling material (200). The first surface that serves as the reference for the depth is an imaginary surface or line (1001I in Figure 3) that connects the first surfaces (1001) on both sides of the portion where the groove (1003) is formed.

[0042] As shown in Figure 3, when there are two or more shortest distances, the shortest distance when calculating the average depth of the region unfilled with the filling material is the longest of the two or more shortest distances (D2 in Figure 3). The shortest distance is calculated for each of the multiple grooves formed in the body, and the arithmetic average of these shortest distances can be calculated to obtain the average depth of the region unfilled with the filling material.

[0043] The average lower limit of the depth of the regions unfilled with the filling material in the plurality of grooves may be 0 μm, 0.5 μm, 1 μm, 1.5 μm, or 2 μm. The upper limit of the average may be about 3 μm, 2.9 μm, 2.8 μm, 2.7 μm, 2.6 μm, 2.5 μm, 2.4 μm, 2.3 μm, or 2.2 μm. The average may be adjusted to be equal to or less than any one of the upper limits; or may be adjusted to be equal to or greater than any one of the lower limits, but equal to or less than any one of the upper limits.

[0044] The upper limit of the standard deviation of the depth of the regions unfilled with the filling material in the grooves may be about 0.2, 0.19, 0.18, 0.17, or 0.16, and the lower limit of the standard deviation may be about 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, or 0.15. The standard deviation may be adjusted to be equal to or less than any one of the upper limits; or, the standard deviation may be adjusted to be equal to or greater than any one of the lower limits, but equal to or less than any one of the upper limits. The unit of the standard deviation may be μm.

[0045] In the light control film, the filling rate and filling uniformity of the filler material into the grooves are controlled as described above, so that the light control film does not cause defects in appearance even when applied to a device that is placed adjacent to a viewer, such as an OLED display.

[0046] To achieve the filling rate and filling uniformity, at least one or more of the tensile strength of the body, the elastic restoring force of the body, and the shape of the grooves can be controlled, as described below.

[0047] The shape of the grooves can be controlled in various ways to achieve the desired light control performance and / or filling characteristics.

[0048] As shown in Figure 4, in a cross section of the body of the light control film (100), the groove can have a first side (10031) extending from the first surface (1001) of the body toward the second surface (1002) of the body, and a second side (10032) opposite the first side (10031) and extending toward the second surface (1002).

[0049] As described above, when the groove has a linear shape when the first surface (1001) of the main body is observed in the normal direction of the first surface (1001) of the main body, the cross section may be perpendicular to the linear shape of the groove and parallel to the normal direction of the first surface (1001).

[0050] As shown in FIG. 4, the groove can form a first angle (θ1 in FIG. 4) between the first side (10031) and the normal direction of the first surface (1001), and a second angle (θ2 in FIG. 4) between the second side (10032) and the normal direction of the first surface (1001).

[0051] The first and second angles may be the same as or different from each other.

[0052] For example, the lower limit of the first angle may be approximately 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, 4 degrees, 4.5 degrees, 5 degrees, 5.5 degrees, 6 degrees, 6.5 degrees, 7 degrees, 7.5 degrees, 8 degrees, 8.5 degrees, 9 degrees, or 9.5 degrees, and the upper limit may be approximately 10 degrees, 9.5 degrees, 9 degrees, 8.5 degrees, 8 degrees, 7.5 degrees, 7 degrees, 6.5 degrees, 6 degrees, 5.5 degrees, 5 degrees, 4.5 degrees, 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees. The angle may be within a range of less than or equal to any one of the aforementioned upper limits; or within a range of more than or equal to any one of the aforementioned lower limits; or within a range of less than or equal to any one of the aforementioned upper limits and more than or equal to any one of the aforementioned lower limits.

[0053] For example, the lower limit of the second angle may be approximately 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, 4 degrees, 4.5 degrees, 5 degrees, 5.5 degrees, 6 degrees, 6.5 degrees, 7 degrees, 7.5 degrees, 8 degrees, 8.5 degrees, 9 degrees, or 9.5 degrees, and the upper limit may be approximately 10 degrees, 9.5 degrees, 9 degrees, 8.5 degrees, 8 degrees, 7.5 degrees, 7 degrees, 6.5 degrees, 6 degrees, 5.5 degrees, 5 degrees, 4.5 degrees, 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees. The angle may be within a range of less than or equal to any one of the aforementioned upper limits; or within a range of more than or equal to any one of the aforementioned lower limits; or within a range of less than or equal to any one of the aforementioned upper limits and more than or equal to any one of the aforementioned lower limits.

[0054] The first and second angles can be adjusted in consideration of the desired light control performance and / or filling characteristics.

[0055] The first and second angles may be the same as each other or may be different from each other.

[0056] When the first and second angles are different from each other, the first angle may be greater than or equal to 2 degrees and the second angle may be less than or equal to 2 degrees. In this case, when the first angle is 2 degrees, the second angle is less than 2 degrees, and when the second angle is 2 degrees, the first angle is greater than 2 degrees.

[0057] When the first and second angles are different from each other, the lower limit of the first angle may be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, or 4 degrees, and the upper limit may be 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, or 2 degrees. The first angle may be greater than or equal to any one of the lower limits; or may be greater than or equal to any one of the lower limits and less than or equal to any one of the upper limits.

[0058] When the first and second angles are different from each other, the upper limit of the second angle may be about 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees, and the lower limit may be about 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, or 2 degrees. The second angle may be within a range equal to or less than any one of the upper limits; or may be equal to or greater than any one of the lower limits, but within a range equal to or less than any one of the upper limits.

[0059] In one example, the first side or the second side of the groove may form two or more angles with the normal direction of the first surface.

[0060] Figure 5 is an example showing such a configuration. In Figure 5, the first side (10031) and the second side (10032) all form two angles with the normal direction of the first surface (1001), but this is not limited to this. That is, for example, in the light control film, only one of the first side and the second side may form two angles with the normal direction, and the other may form only one angle, or one or more sides may form three or more angles with the normal direction.

[0061] As shown in FIG. 5 as an example, when the first side (10031) or the second side (10032) forms two or more angles with the normal direction, the first side (10031) or the second side (10032) may include side A (10031A, 10032A) that forms an angle A (θA in FIG. 5) with the normal direction of the first surface (1001) and side B (10031B, 10032B) that forms an angle B (θB in FIG. 5) different from angle A.

[0062] When the side B (10031B, 10032B) is located closer to the second surface (1002) of the main body relative to the side A (10031A, 10032A), the angle A (θA in FIG. 5) may be greater or smaller than the angle B (θB in FIG. 5).

[0063] When the angle A is smaller than the angle B, the angle A (θA in FIG. 5) may be 2 degrees or less, and the angle B (θB in FIG. 5) may be 2 degrees or more. In the above, when the angle A (θA in FIG. 5) is 2 degrees, the angle B (θB in FIG. 5) may be more than 2 degrees, and when the angle B (θB in FIG. 5) is 2 degrees, the angle A (θA in FIG. 5) may be less than 2 degrees.

[0064] In the above, the lower limit of angle B (θB in FIG. 5) may be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, or 4 degrees, and its upper limit may be about 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, or 2 degrees. Angle B may be within a range equal to or greater than any one of the lower limits; or may be within a range equal to or greater than any one of the lower limits and less than or equal to any one of the upper limits.

[0065] In the above, the upper limit of angle A (θA in FIG. 5) may be about 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees, and its lower limit may be about 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, or 2 degrees. The angle A may be within a range equal to or less than any one of the upper limits; or may be equal to or greater than any one of the lower limits, but within a range equal to or less than any one of the upper limits.

[0066] When the angle A is greater than the angle B, the angle B (θB in FIG. 5) may be less than or equal to 2 degrees, and the angle A (θA in FIG. 5) may be greater than or equal to 2 degrees. When the angle B (θB in FIG. 5) is 2 degrees, the angle A (θA in FIG. 5) may be greater than 2 degrees, and when the angle A (θA in FIG. 5) is 2 degrees, the angle B (θB in FIG. 5) may be less than 2 degrees.

[0067] In the above, the lower limit of angle A (θA in FIG. 5) may be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, or 4 degrees, and its upper limit may be about 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, or 2 degrees. The angle A may be within a range equal to or greater than any one of the lower limits; or may be within a range equal to or greater than any one of the lower limits and less than or equal to any one of the upper limits.

[0068] In the above, the upper limit of angle B (θB in FIG. 5) may be about 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees, and its lower limit may be about 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, or 2 degrees. Angle B may be within a range equal to or less than any one of the upper limits; or may be equal to or greater than any one of the lower limits, but within a range equal to or less than any one of the upper limits.

[0069] As described above, when the first side or the second side of the groove includes side A and side B, R in the following formula 1 may be within a predetermined range. [Formula 1] R = (100×L B× cosθ B ) / (L A× cosθ A +L B× cosθ B )

[0070] In Equation 1, L A and L B are the lengths of the side A and side B, respectively, and θ A and θ B are the angles A and B, respectively.

[0071] In Equation 1, L A and L B The units of are not limited as long as the same units are applied to each other.

[0072] The lower limit of R in Formula 1 may be about 5%, 10%, 15%, 20%, 25%, 30%, 35%, or 40%, and the upper limit may be about 40%, 35%, 30%, 25%, 20%, 15%, 10%, or 5%. R in Formula 1 may be less than or equal to any one of the upper limits mentioned above; or greater than or equal to any one of the lower limits mentioned above; or less than or equal to any one of the upper limits mentioned above but greater than or equal to any one of the lower limits mentioned above.

[0073] The grooves having the above-mentioned configuration can be adapted to ensure the desired light control performance and filling characteristics.

[0074] In order to ensure the desired filling characteristics, etc., the shape of the surface of the body, particularly the shape of the first surface between the grooves, can be controlled.

[0075] 6, in the cross section of the main body, the first surface (1001) between the grooves may include an opposing side (10), a first inclined side (20) having one end connected to each end of the opposing side (10) and forming an angle θ11 with the opposing side (10), and a second inclined side (30) having one end connected to the end of the first inclined side (20) that is not connected to the opposing side (10) and forming an angle θ21 with the opposing side (10). In this case, the opposing side (10) may be, for example, the first surface (1001) that is substantially horizontal with the second surface (1002) of the main body.

[0076] By forming the above structure, the filling or removal property of the filling material can be improved during the manufacturing process of the light control film, thereby efficiently ensuring the above-mentioned filling rate and filling uniformity, and furthermore, the surface properties of the light control film can be stably maintained.

[0077] As described above, when the groove has a linear shape when the first surface (1001) of the main body is observed in the normal direction of the first surface (1001) of the main body, the cross section may be perpendicular to the linear shape of the groove and parallel to the normal direction of the first surface (1001).

[0078] In the cross section, the opposing side (10) may form an angle with the side formed by the second surface (1002) of 0 to 10 degrees, 0 to 9 degrees, 0 to 8 degrees, 0 to 7 degrees, 0 to 6 degrees, 0 to 5 degrees, 0 to 4 degrees, 0 to 3 degrees, 0 to 2 degrees, 0 to 1 degree, or substantially 0 degrees.

[0079] The angle θ11 and the angle θ21 may be different from each other.

[0080] In one example, the lower limit of the angle θ11 may be approximately 0.5 degrees, 1 degree, 1.5 degrees, 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, 4 degrees, 4.5 degrees, 5 degrees, 5.5 degrees, 6 degrees, 6.5 degrees, 7 degrees, 7.5 degrees, 8 degrees, 8.5 degrees, 9 degrees, 9.5 degrees, 10 degrees, 10.5 degrees, or 11 degrees, and the upper limit may be approximately 11 degrees, 10.5 degrees, 10 degrees, 9.5 degrees, 9 degrees, 8.5 degrees, 8 degrees, 7.5 degrees, 7 degrees, 6.5 degrees, 6 degrees, 5.5 degrees, 5 degrees, 4.5 degrees, 4 degrees, 3.5 degrees, 3 degrees, or 2.5 degrees. The angle θ11 may be within a range of less than or equal to any one of the above-mentioned upper limits; or within a range of greater than or equal to any one of the above-mentioned lower limits; or may be within a range of less than or equal to any one of the above-mentioned upper limits and greater than or equal to any one of the above-mentioned lower limits.

[0081] In the above, the lower limit of the ratio θ21 / θ11 of the angles θ21 and θ11 may be about 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, or 29, and the upper limit may be 100, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30, 25, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, or 9. The ratio θ21 / θ11 may be in a range of less than or equal to any one of the above upper limits; or in a range of greater than or equal to any one of the above lower limits; or may be in a range of less than or equal to any one of the above upper limits and greater than or equal to any one of the above lower limits.

[0082] In the above structure, H can be adjusted according to the following formula 2. [Formula 2] H = L1 × sinθ11

[0083] In Equation 2, L1 is the length of the first inclined side, and θ11 is the angle formed between the opposing side and the first inclined side.

[0084] The upper limit of H may be about 3 μm, 2.5 μm, 2 μm, 1.5 μm, 1 μm, or 0.5 μm. The lower limit of H may be about 0.01 μm, 0.05 μm, 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 1 μm, 1.5 μm, 2 μm, or 2.5 μm. H may be equal to or less than any one of the upper limits; or equal to or greater than any one of the lower limits; or equal to or less than any one of the upper limits but equal to or greater than any one of the lower limits.

[0085] In the structure, the total depth of the grooves (H in FIG. 1) is T ) ratio H TThe lower limit of the ratio H / H may be about 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 110, 120, 130, 140, 150, or 155. T The upper limit of / H may be about 1,000, 950, 900, 850, 800, 750, 700, 650, 600, 550, 500, 450, 400, 350, 300, 250, 200, 190, 180, 170, 160, 150, 140, 130, 120, 110, 100, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, or 40. T / H may be in a range equal to or less than any one of the aforementioned upper limits; or equal to or greater than any one of the aforementioned lower limits; or may be in a range equal to or less than any one of the aforementioned upper limits and equal to or greater than any one of the aforementioned lower limits.

[0086] In the above structure, when the length of the opposing sides is T, T can be adjusted so that the value K of the following formula 3 falls within a predetermined range. [Formula 3] K = T / (T+2×cos θ11×L1)

[0087] In Equation 3, T is the length of the opposing side, L1 is the length of the first inclined side, and θ11 is the angle formed between the opposing side and the first inclined side.

[0088] In Formula 3, the units of T and L1 are not limited as long as the same units are applied to each other.

[0089] The lower limit of K in Formula 3 may be about 0.01, 0.05, 0.1, 0.15, or 0.2, and the upper limit may be about 2, 1.5, 1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, or 0.25. K may be less than or equal to any one of the upper limits; or greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits but greater than or equal to any one of the lower limits.

[0090] Through the application of such structures, the desired filling characteristics can be achieved more efficiently.

[0091] The depth of the groove formed in the body (H in FIG. 1) T The range of the depth is not particularly limited and can be adjusted taking into consideration the desired performance. The lower limit of the depth may be, for example, about 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm. The upper limit of the depth may be, for example, about 200 μm, 195 μm, 190 μm, 185 μm, 180 μm, 175 μm, 170 μm, 165 μm, 160 μm, 155 μm, 150 μm, 145 μm, 140 μm, 135 μm, 130 μm, 125 μm, 120 μm, 115 μm, 110 μm, 105 μm, 100 μm, 95 μm, 90 μm, 85 μm, or 80 μm. The depth may be less than or equal to any one of the upper limits mentioned above; or greater than or equal to any one of the lower limits mentioned above; or less than or equal to any one of the upper limits mentioned above but greater than or equal to any one of the lower limits mentioned above. When multiple grooves are present and the groove depths are not uniform, the groove depth may be the arithmetic average of the depths of the multiple grooves.

[0092] The pitch of the grooves formed in the main body can also be adjusted in consideration of the desired performance. The pitch is the distance from the start of one groove on the first surface (1001) to the start of another groove adjacent to the groove, as shown by P in Figure 1. The lower limit of the pitch may be, for example, about 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, or 60 μm. The upper limit of the pitch may be, for example, about 150 μm, 145 μm, 140 μm, 135 μm, 130 μm, 125 μm, 120 μm, 115 μm, 110 μm, 105 μm, 100 μm, 95 μm, 90 μm, 85 μm, 80 μm, 75 μm, 70 μm, 65 μm, 60 μm, 55 μm, 50 μm, 45 μm, or 40 μm. When multiple grooves are present and the pitch between the grooves is not uniform, the groove pitch may be the arithmetic average of the pitches of the multiple grooves. The groove pitch may be less than or equal to any one of the upper limits; or greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits but greater than or equal to any one of the lower limits.

[0093] The width of the groove formed in the main body can also be adjusted taking into account the desired performance. Here, the width is the dimension of the groove as seen on the first surface (1001) of the cross section of the main body, as shown by W1 in FIG. 1 . The lower limit of the width may be, for example, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, or 12 μm. The upper limit of the width may be approximately 50 μm, 45 μm, 40 μm, 35 μm, 30 μm, 25 μm, 20 μm, 15 μm, 14 μm, 13 μm, 12 μm, 11 μm, or 10 μm. When multiple grooves are present and the widths of the grooves are not uniform, the width of the groove may be the arithmetic average of the widths of the multiple grooves. The groove width may be within a range of less than or equal to any one of the aforementioned upper limits; or greater than or equal to any one of the aforementioned lower limits; or may be within a range of less than or equal to any one of the aforementioned upper limits and greater than or equal to any one of the aforementioned lower limits.

[0094] The difference (P-W1) between the groove pitch (P) and the groove width (W1) can also be adjusted in consideration of the desired performance. The lower limit of the difference (P-W1) may be, for example, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, or 30 μm. The upper limit of the difference (P-W1) may be approximately 100 μm, 95 μm, 90 μm, 85 μm, 80 μm, 75 μm, 70 μm, 65 μm, 60 μm, 55 μm, 50 μm, 45 μm, 40 μm, 35 μm, or 30 μm. When the difference (P-W1) is not constant due to the presence of multiple grooves, the difference (P-W1) may be an arithmetic average. The difference (P-W1) may be within a range of less than or equal to any one of the upper limits mentioned above; or within a range of greater than or equal to any one of the lower limits mentioned above; or within a range of less than or equal to any one of the upper limits mentioned above and greater than or equal to any one of the lower limits mentioned above.

[0095] In the light control film, the aperture ratio can be controlled.

[0096] In one example, the lower limit of the aperture ratio of the first surface of the main body (the aperture ratio of the transmissive region) may be approximately 60%, 65%, 70%, 75%, or 80%. In another example, the upper limit of the aperture ratio of the first surface (the aperture ratio of the transmissive region) may be approximately 100%, 95%, 90%, 85%, 80%, 75%, 70%, or 65%. The aperture ratio may be less than or equal to any one of the upper limits; or greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits but greater than or equal to any one of the lower limits. The aperture ratio of the first surface is the ratio of the area of ​​the transmissive region formed on the first surface to the entire area of ​​the first surface. For example, referring to FIG. 1, it is the ratio of the area of ​​the transmissive region formed on the first surface (1001) to the entire area of ​​the first surface (1001) (in FIG. 1, the area of ​​the first surface (1001) excluding the region forming width W1).

[0097] In one example, the lower limit of the aperture ratio of the second surface of the main body (the aperture ratio of the transmissive region) may be approximately 60%, 65%, 70%, 75%, 80%, 85%, or 90%. The upper limit of the aperture ratio of the second surface (the aperture ratio of the transmissive region) may be less than 100%, 95% or less, 90% or less, 85% or less, or 80% or less. The aperture ratio may be equal to or less than any one of the above upper limits; or equal to or greater than any one of the above lower limits; or equal to or less than any one of the above upper limits but equal to or greater than any one of the above lower limits. The aperture ratio of the second surface is the ratio of the area of ​​the transmissive region formed on the second surface to the total area of ​​the second surface. For example, referring to FIG. 1, it is the ratio of the area of ​​the transmissive region formed on the second surface (1002) to the total area of ​​the second surface (1002) (in FIG. 1, the area of ​​the second surface (1002) excluding the region forming width W2).

[0098] In the main body, the ratio (O2 / O1) of the aperture ratio (O1) on the first surface to the aperture ratio (O2) on the second surface may be within a predetermined range. For example, the lower limit of the ratio (O2 / O1) may be about 1, 1.01, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4 or 1.45, and the upper limit thereof may be about 5, 4.5, 4, 3.5, 3, 2.5, 2 or 1.5. The ratio O2 / O1 is within the range below or less than any one of the above upper limits; or within the range above or exceeding any one of the above lower limits; or within the range below or less than any one of the above upper limits while above or exceeding any one of the above lower limits.

[0099] Considering the intended light control performance, the refractive index relationship between the main body (transmission region) and the filling material (absorption region) can be adjusted. At this time, the refractive index relationship can be determined in consideration of the application for which the light control film is applied.

[0100] For example, when the refractive index of the main body (transmission region) is N1 and the refractive index of the filling material (absorption region) is N2, N1 and N2 can satisfy the relationship of N1 > N2, the relationship of N1 = N2, or the relationship of N1 < N2, and any one of these relationships can be satisfied depending on the application.

[0101] In the light control film, the upper limit of the absolute value of the difference between the refractive indices N1 and N2 may be 0.1, 0.09, 0.08, 0.07, 0.06, 0.05, 0.04, 0.03 or 0.02. The lower limit of the absolute value of the difference between the refractive indices N1 and N2 may be about 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08 or 0.09. The absolute value of the difference in refractive index is within the range that is less than or below any one of the aforementioned upper limits; or within the range that is greater than or exceeds any one of the aforementioned lower limits; or within the range that is less than or below any one of the aforementioned upper limits while being greater than or exceeding any one of the aforementioned lower limits.

[0102] N1 and N2 may satisfy the relationship of N1 > N2, N1 = N2, or N1 < N2, and at the same time, the absolute value of the difference in their refractive indices may be within the aforementioned range.

[0103] As described above, depending on the application use of the light control film, it can satisfy any one of the three types of refractive index relationships described above and any one of the ranges of the absolute value of the difference in refractive index described above.

[0104] The refractive indices N1 and N2 can be measured by the method described in "1. Measurement of Refractive Index" in the Example Items of this specification.

[0105] In the light control film, the material constituting the main body is not particularly limited. Usually, in a light control film, the main body is formed by curing an acrylate material, and in this application, a main body formed in such a manner can also be applied.

[0106] In one example, in order to improve the filling characteristics (filling rate and filling uniformity) of the aforementioned filling substance, a main body having improved tensile strength and elastic resilience can be used as the main body.

[0107] In the process of manufacturing the light control film, a so-called scrubbing process can be applied to fill the grooves of the body with the filler material. In this process, the body is pressed using a pressing means such as a knife to fill the grooves with the filler material. In this process, the stronger the body is, the less the pressing of the body can be reduced, thereby increasing the filling rate.

[0108] When the pressure applied by the crimping means is removed, the speed at which the body recovers after being crimped also affects the filling rate, so it is recommended to use a body having an appropriate level of elastic recovery force.

[0109] In one example, the lower limit of the tensile strength of the body may be about 7 MPa, 7.1 MPa, 7.2 MPa, 7.3 MPa, 7.4 MPa, 7.5 MPa, 7.6 MPa, 7.7 MPa, 7.8 MPa, 7.9 MPa, 8 MPa, 8.1 MPa, 8.2 MPa, 8.3 MPa, 8.5 MPa, 9 MPa, 9.5 MPa, 10 MPa, 11 MPa, 12 MPa, or 13 MPa, and the upper limit of the tensile strength of the body may be about 20 MPa, 19 MPa, 18 MPa, 17 MPa, 16 MPa, 15 MPa, 14 MPa, 13 MPa, 12 MPa, 11 MPa, 10 MPa, 9 MPa, 8 MPa, or 7.5 MPa. The tensile strength of the body may be below or below any one of the upper limits mentioned above; or above or above any one of the lower limits mentioned above; or below or below any one of the upper limits mentioned above but above or above any one of the lower limits mentioned above. Such tensile strength may be measured according to the method described in "2. Measurement of Tensile Strength" in the Examples section of this specification.

[0110] The body may have a suitable elastic resilience to achieve the fill factor described below. For example, in a test using a pencil hardness tester, the body may be marked with a 2H hardness pencil under a load of 300 g. When the pencil is removed, the mark may disappear within 1 minute, 50 seconds, 40 seconds, 30 seconds, 20 seconds, or 10 seconds. This resilience may be suitable for forming the desired light control film. The resilience may be evaluated using the method described in "3. Evaluation of Elastic Resilience" in the Examples section of this specification.

[0111] To ensure the above properties, the material from which the body is formed can be controlled.

[0112] In one example, the body can include an acrylic polymer.

[0113] The term acrylic polymer refers to a crosslinked, polymerized, or crosslinked and polymerized acrylate.

[0114] The term acrylate refers to a monomer, oligomer, or other precursor having one or more (meth)acryloyl groups that forms the acrylic polymer by polymerization and / or crosslinking, examples of which include acrylic acid, methacrylic acid, acrylic acid esters, or methacrylic acid esters.

[0115] As used herein, the term (meth)acryloyl group means an acryloyl group or a methacryloyl group.

[0116] The content of the acrylic polymer in the body may be, based on the total weight of the body, about 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% by weight, and about 100%, 99%, or 98% by weight. The content may be greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits, but greater than or equal to any one of the lower limits.

[0117] In one example, the acrylic polymer may contain certain types of bonds to ensure the aforementioned tensile strength and / or recovery properties.

[0118] For example, the acrylic polymer may include a bond of the following Chemical Formula 1 and / or a bond of the following Chemical Formula 2. The acrylic polymer may include either one of the bonds of the following Chemical Formulas 1 and 2, or may include both of them.

[0119] [ka]

[0120] In Chemical Formula 1, R1 is a single bond, an alkylene group, or an alkylidene group.

[0121] In Chemical Formula 1, when R1 is a single bond, it means that R1 does not exist and the benzene rings on both sides of R1 are directly linked to form a biphenyl structure.

[0122] In the structure of Chemical Formula 1, the benzene structure, alkylene group and / or alkylidene group may be optionally substituted with one or more substituents, if necessary.

[0123] [ka]

[0124] In Chemical Formula 2, R2 is an alkylene group or an alkylidene group, and n is an arbitrary number.

[0125] In Chemical Formula 2, the lower limit of n may be about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20, and the upper limit of n may be about 50, 45, 40, 35, 30, 25, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, or 4. n may be less than or equal to any one of the above upper limits, but may be greater than or equal to any one of the above lower limits.

[0126] In Chemical Formulas 1 and 2, the term "alkylene group" refers to a functional group in which two hydrogen atoms have been removed from an alkane and linked to another target, where the two hydrogen atoms have been removed from other carbon atoms of the alkane. The alkylene group may be an alkylene group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms. The alkylene group may be linear, branched, or cyclic. The alkylene group may be optionally substituted with one or more substituents. In particular, the alkylene group in Chemical Formula 1 may be optionally substituted with one or more halogen atoms. Examples of halogen atoms include, but are not limited to, fluorine, chlorine, and iodine.

[0127] As used herein, unless otherwise specified, the term "alkylidene group" refers to a functional group in which two hydrogen atoms have been removed from an alkane and linked to another object, and refers to a structure in which the two hydrogen atoms have been removed from one carbon atom of the alkane. Such alkylidene groups may be alkylidene groups having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms. Such alkylidene groups may be linear, branched, or cyclic. Such alkylidene groups may be optionally substituted with one or more substituents. In particular, the alkylidene group in Formula 1 may be optionally substituted with one or more halogen atoms. Examples of halogen atoms include, but are not limited to, fluorine, chlorine, and iodine.

[0128] The bonding may contribute to the body exhibiting an appropriate level of tensile strength and / or resilience properties, and may also contribute to adjusting the refractive index of the body to an appropriate level.

[0129] The method for introducing the bond into the acrylic polymer is not particularly limited.

[0130] For example, a method can be used in which the acrylic polymer is formed using a monomer containing the above bond in the molecular structure as the acrylate.

[0131] Therefore, the acrylic polymer may include acrylate units having a bond of Chemical Formula 1, acrylate units having a bond of Chemical Formula 2, and / or acrylate units having a bond of Chemical Formula 1 and a bond of Chemical Formula 2.

[0132] The acrylate unit means that the acrylate is contained in the acrylic polymer after polymerization or crosslinking.

[0133] In this case, based on the total weight of the acrylate units contained in the acrylic polymer, the lower limit of the ratio of the acrylate units containing the bond of Chemical Formula 1 may be about 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt%, 75 wt%, 80 wt%, or 85 wt%, and the upper limit may be about 99 wt%, 95 wt%, 90 wt%, 85 wt%, 80 wt%, 75 wt%, 70 wt%, 65 wt%, 60 wt%, 55 wt%, 50 wt%, 45 wt%, 40 wt%, 35 wt%, or 30 wt%. The content may be in a range below or below any one of the upper limits mentioned above; or in a range above or above any one of the lower limits mentioned above; or in a range below or below any one of the upper limits mentioned above and above or above any one of the lower limits mentioned above.

[0134] Based on the total weight of the acrylate units contained in the acrylic polymer, the lower limit of the ratio of the acrylate units containing the bond of Chemical Formula 2 may be about 5 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, or 35 wt%, and the upper limit may be about 50 wt%, 45 wt%, 40 wt%, 35 wt%, 30 wt%, 25 wt%, 20 wt%, or 15 wt%. The content may be equal to or less than any one of the above upper limits; or equal to or greater than any one of the above lower limits; or equal to or less than any one of the above upper limits but equal to or greater than any one of the above lower limits.

[0135] In the acrylic polymer, units other than the acrylate unit having the bond of Chemical Formula 1, the acrylate unit having the bond of Chemical Formula 2, and the acrylate unit having the bond of Chemical Formula 1 and the bond of Chemical Formula 2 may be acrylate units not having the bond of Chemical Formula 1 and the bond of Chemical Formula 2, or may be units of monomers other than acrylate.

[0136] To control the tensile strength and / or recovery properties, the acrylate may be a multifunctional monomer having two or more functionalities. In this context, a multifunctional monomer having two or more functionalities means that the monomer contains two or more, three or more, four or more, or five or more (meth)acryloyl groups. The number of functional groups contained in the multifunctional monomer may be ten or less, nine or less, eight or less, seven or less, six or less, five or less, four or less, or three or less. The number of functional groups may be adjusted between any one of the above upper limits and any one of the above lower limits. In one example, the number of (meth)acryloyl groups contained in the multifunctional monomer may be two or three.

[0137] Based on the total weight of the acrylate units contained in the acrylic polymer, the lower limit of the ratio of the multifunctional acrylate units may be about 5 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, or 55 wt%, and the upper limit may be about 80 wt%, 75 wt%, 70 wt%, 65 wt%, 60 wt%, 55 wt%, 50 wt%, 45 wt%, 40 wt%, 35 wt%, 30 wt%, or 20 wt%. The content may be less than or equal to any one of the above upper limits; or greater than or equal to any one of the above lower limits; or less than or equal to any one of the above upper limits but greater than or equal to any one of the above lower limits.

[0138] The acrylic polymer may contain a monofunctional acrylate unit in addition to the polyfunctional acrylate unit. The monofunctional acrylate refers to a monomer having one (meth)acryloyl group.

[0139] The lower limit of the weight ratio of the monofunctional acrylate units to 100 parts by weight of the polyfunctional acrylate units may be about 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight, 65 parts by weight, or 70 parts by weight, and the upper limit thereof may be about 150 parts by weight, 145 parts by weight, 140 parts by weight, 135 parts by weight, 130 parts by weight, 125 parts by weight, 120 parts by weight, 115 parts by weight, 110 parts by weight, 105 parts by weight, 100 parts by weight, 95 parts by weight, 90 parts by weight, 85 parts by weight, 80 parts by weight, 75 parts by weight, 70 parts by weight, 65 parts by weight, 60 parts by weight, 55 parts by weight, or 50 parts by weight. The ratio may be in a range below or below any one of the aforementioned upper limits; or in a range above or above any one of the aforementioned lower limits; or in a range below or below any one of the aforementioned upper limits and above or above any one of the aforementioned lower limits.

[0140] The monofunctional and / or polyfunctional acrylate may include the bond of Chemical Formula 1 and / or Chemical Formula 2 above.

[0141] The specific type of the polyfunctional acrylate is not particularly limited. For example, applicable polyfunctional acrylates include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, hydroxypivalic acid neopentyl glycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphoric acid di(meth)acrylate, di(meth)acryloxyethyl isocyanurate, allylated cyclohexyl di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, dimethylol dicyclopentane di(meth)acrylate, ethylene oxide-modified hexahydrophthalic acid di(meth)acrylate, neopentyl glycol-modified trimethylolpropane di(meth)acrylate, adamantane di(meth)acrylate, 9,9-bis[ Examples of suitable acrylates include one or more selected from the group consisting of bifunctional acrylates such as 4-(2-acryloyloxyethoxy)phenyl]fluorene; trifunctional acrylates such as trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, propionic acid-modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide-modified trimethylolpropane tri(meth)acrylate, and tris(meth)acryloxyethyl isocyanurate; tetrafunctional acrylates such as diglycerin tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; pentafunctional acrylates such as propionic acid-modified dipentaerythritol penta(meth)acrylate; and hexafunctional acrylates such as dipentaerythritol hexa(meth)acrylate and caprolactone-modified dipentaerythritol hexa(meth)acrylate.

[0142] Examples of the monofunctional acrylate include, but are not limited to, alkyl (meth)acrylate, hydroxyalkyl (meth)acrylate, and glycidyl (meth)acrylate.

[0143] Examples of the polyfunctional or monofunctional acrylate containing the bond of Chemical Formula 1 and / or 2 include, but are not limited to, bisphenol diacrylates such as modified bisphenol fluorine diacrylate, bisphenol A ethoxylate diacrylate, ortho-phenyl phenoxyl ethyl acrylate (OPPEA), and / or phenylbenzyl acrylate.

[0144] The body can be formed using known means such as imprinting, pressing or injection molding using a curable material including the above materials.

[0145] The main body can generally have a thickness in the range of 50 μm to 500 μm.

[0146] A filler material is present in the groove formed in the body, the filler material including a light absorbing material.

[0147] Various types of filler materials for forming the light control film are known, and the known materials can be used in the present application.

[0148] Typically, the filler material includes a resin material acting as a binder and a light-absorbing coloring material, such as a pigment or dye. Examples of applicable light-absorbing materials include black pigments such as carbon black, dyes, and resin particles, such as transparent particles such as acrylic polymer particles dyed with black pigments such as carbon black. In addition to black pigments, mixtures of various blue, purple, yellow, and red pigments and / or dyes, or materials formed by mixing and dispersing the black colorant into blue, purple, yellow, or red colorants, can also be used. Examples of blue pigments include copper phthalocyanine, purple pigments include dioxazine violet, yellow pigments include disazo yellow, and red pigments include chromophthalic red typel. However, the present invention is not limited to these examples, and dyes can also be used in addition to pigments.

[0149] There are no particular limitations on the type of binder contained in the filler material, and an appropriate type can be selected taking into consideration the relationship between the dispersibility of the light-absorbing material and the target refractive index of the main body, etc. Typically, reactive oligomers (epoxy acrylate, urethane acrylate, polyether acrylate, polyester acrylate, polythiol, etc.) and reactive monomers (vinylpyrrolidone, 2-ethylhexyl acrylate, β-hydroxyacrylate, tetrahydrofurfuryl acrylate, etc.) can be used, but the applicable materials are not limited to these.

[0150] The light control film may include additional components in addition to those described above.

[0151] For example, the light control film may include a base film formed on one or both surfaces of the body.

[0152] Figure 7 shows the case where the base film (2000) is formed on one side of the body (100) disclosed in Figure 1. In Figure 7, the base film (2000) is present on only one side of the body (100), but the film (2000) can also be present on both sides of the body (100).

[0153] The specific type of the base film is not particularly limited. For example, an anisotropic polymer film imparted with optical anisotropy by stretching or an isotropic film without optical anisotropy can be used as the base film. Examples of polymer films include polyolefin films such as polyethylene film or polypropylene film, cycloolefin polymer (COP) films such as polynorbornene film, polyvinyl chloride film, polyacrylonitrile film, polysulfone film, polyacrylate film, cellulose ester polymer films such as PVA (poly(vinyl alcohol)) film or TAC (triacetyl cellulose) film, polyester film, polycarbonate film, and copolymer films of two or more monomers among the monomers that form the polymers.

[0154] By using an anisotropic polymer film with a large in-plane retardation as the base film, it is possible to more effectively provide a light control film that prevents poor appearance.

[0155] In one example, the lower limit of the in-plane retardation (based on a wavelength of 550 nm) of the anisotropic polymer film may be about 8,000 nm, 9,000 nm, 10,000 nm, 11,000 nm, or 12,000 nm, and the upper limit may be about 100,000 nm, 90,000 nm, 80,000 nm, 70,000 nm, 60,000 nm, 50,000 nm, 40,000 nm, 30,000 nm, 20,000 nm, 15,000 nm, 14,000 nm, 13,000 nm, or 12,000 nm. The in-plane retardation may be in a range of less than or equal to any one of the upper limits mentioned above; or in a range of more than or equal to any one of the lower limits mentioned above; or in a range of less than or equal to any one of the upper limits and more than or equal to any one of the lower limits mentioned above. By using a base film having such an in-plane retardation, it is possible to suppress the occurrence of rainbow patterns and other unevenness even when the light control film is exposed to polarized light, etc.

[0156] The in-plane retardation is a physical quantity according to the following formula 4. [Formula 4] Rin = d × (nx - ny)

[0157] In Equation 4, Rin is the in-plane retardation, nx is the refractive index of the film in the slow axis direction, ny is the refractive index of the film in the fast axis direction, and d is the film thickness. The meanings of the slow axis and fast axis are well known in the art.

[0158] The type of base film is not particularly limited.

[0159] For example, a typical example of a film that exhibits the above-mentioned in-plane retardation known in the art is a stretched polyester film such as a stretched PET (poly(ethyleneterephthalate)) film.

[0160] Therefore, the base film may be the polyester film, but is not limited thereto.

[0161] As described above, when the grooves formed in the body are formed to exhibit a linear shape when the first surface of the body is observed in the normal direction of the first surface, the lower limit of the angle between the slow axis of the base film and the linear shape may be about 80 degrees, 85 degrees, or 90 degrees, and the upper limit may be about 90 degrees or 85 degrees. The angle may be within a range equal to or less than any one of the above upper limits; or equal to or greater than any one of the above lower limits; or may be within a range equal to or less than any one of the above upper limits but equal to or greater than any one of the above lower limits.

[0162] In another example, when the grooves formed in the body are linear when the first surface of the body is observed in the normal direction of the first surface, the lower limit of the angle between the slow axis of the base film and the linear shape may be about 0, 2, 4, 6, 8, or 10 degrees, and the upper limit may be about 10, 8, 6, 4, or 2 degrees. The angle may be equal to or less than any one of the upper limits; or equal to or greater than any one of the lower limits; or equal to or less than any one of the upper limits but equal to or greater than any one of the lower limits.

[0163] The base film may have a thickness generally within the range of 5 μm to 500 μm, but is not limited thereto.

[0164] In one example, the light control film may include a pressure-sensitive adhesive layer or an adhesive layer formed on one or both surfaces of the main body. The pressure-sensitive adhesive layer or adhesive layer is applied to attach the light control film to a display device or the like. FIG. 8 shows a case where the pressure-sensitive adhesive layer (3000) is formed on one surface of the main body (100). In the case of FIG. 8, the pressure-sensitive adhesive layer is formed on the first surface of the main body (100), and in such a case, the first surface is usually the light input surface. The pressure-sensitive adhesive layer may also be formed on the second surface of the main body.

[0165] The type of the pressure-sensitive adhesive layer or adhesive layer is not particularly limited, and for example, an acrylic or silicone pressure-sensitive adhesive known in the industry as so-called OCA (Optical Clear Adhesive) can be used.

[0166] The thickness of the pressure-sensitive adhesive layer or adhesive layer is usually within the range of 1 μm to 100 μm, but is not limited to this.

[0167] The light control film may have any other necessary components in addition to the above components.

[0168] The present specification discloses a device, such as a display device, to which the light control film is applied.

[0169] There are no particular limitations on the specific type of display device to which the light control film can be applied, and the light control film can be applied to, for example, a liquid crystal display (LCD), an organic light emitting diode (OLED) display, a plasma display panel (PDP), etc.

[0170] The light control film can provide a light control film that exhibits the intended performance while not generating defects such as stripes that can be recognized by the viewer, even when applied to a device in which the light control film is positioned relatively close to the viewer, such as an OLED (Organic Light Emitting Diode) display, among various display devices, and which does not have elements that can compensate for defects that may appear due to the light control film, such as a backlight, a diffusion film, or a prism film.

[0171] Accordingly, the present specification discloses an OLED (Organic Light Emitting Diode) display (organic light emitting device) to which the light control film is applied.

[0172] The display may typically include an organic light-emitting panel and the light control film disposed on the viewable side of the organic light-emitting panel.

[0173] A polarizing layer is usually disposed on the viewing side of an OLED (Organic Light Emitting Diode) display for the purposes of preventing reflection and the like.

[0174] Therefore, the OLED (Organic Light Emitting Diode) display may further include a polarizing layer on the viewing side.

[0175] In such a case, the light control film may be disposed between the polarizing layer and the organic light-emitting panel, or on the surface of the polarizing layer opposite to the surface facing the organic light-emitting panel.

[0176] In the above, for example, as shown in Figure 2, when the first surface of the main body of the light control film is observed in the normal direction to the first surface, if the grooves are formed to have a linear shape, the lower limit of the angle between the linear shape of the groove and the light absorption axis of the polarizing layer may be about 1 degree, 2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, or 11 degrees, and the upper limit may be about 30 degrees, 29 degrees, 28 degrees, 27 degrees, 26 degrees, 25 degrees, 24 degrees, 23 degrees, 22 degrees, 21 degrees, 20 degrees, 19 degrees, 18 degrees, 17 degrees, 16 degrees, 15 degrees, 14 degrees, 13 degrees, 12 degrees, 11 degrees, 10 degrees, 9 degrees, 8 degrees, 7 degrees, 6 degrees, 5 degrees, 4 degrees, or 3 degrees. The angle may be within a range of less than or equal to any one of the aforementioned upper limits; or within a range of more than or equal to any one of the aforementioned lower limits; or within a range of less than or equal to any one of the aforementioned upper limits and more than or equal to any one of the aforementioned lower limits.

[0177] When the light control film is disposed as described above, the distance between the polarizing layer and the light control film may vary depending on the type of OLED (Organic Light Emitting Diode) display. However, in order to prevent defects such as ghosts or moire, the refractive index relationship between the body of the light control film and the filler material can be controlled depending on the distance.

[0178] For example, the distance between the polarizing layer and the first surface can be adjusted to adjust the properties of the light control film to ensure desired characteristics.

[0179] For example, a first embodiment is when the distance between the polarizing layer and the first surface is 250 μm or less, and a second embodiment is when the distance exceeds 250 μm. The characteristics are described below.

[0180] In the first embodiment, the upper limit of the distance between the polarizing layer and the first surface may be about 240 μm, 230 μm, 220 μm, 210 μm, 200 μm, or 195 μm, and the lower limit may be about 50 μm, 100 μm, 150 μm, or 185 μm. The distance may be less than or equal to any one of the upper limits; or may be less than or equal to any one of the upper limits and greater than or equal to any one of the lower limits.

[0181] In the first embodiment, the refractive index N1 of the body and the refractive index N2 of the filling material may satisfy the relationship N1>N2.

[0182] In this case, the lower limit of the difference N1-N2 between the refractive indices N1 and N2 may be 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06, or 0.065, and the upper limit may be about 0.08, 0.075, 0.07, 0.065, 0.06, 0.055, 0.05, 0.045, 0.04, or 0.035. N1-N2 may be in a range equal to or less than any one of the upper limits; or equal to or greater than any one of the lower limits; or equal to or less than any one of the upper limits but equal to or greater than any one of the lower limits.

[0183] In this case, the first surface of the body of the light control film may be positioned closer to the polarizing layer than the second surface, or the second surface may be positioned closer to the polarizing layer than the first surface.

[0184] In the first embodiment, the lower limit of the aperture ratio (aperture ratio of the transmissive region) on the first surface of the main body of the light control film may be approximately 60%, 65%, 70%, 75%, or 80%. The upper limit of the aperture ratio (aperture ratio of the transmissive region) on the first surface may be approximately 100%, 95%, 90%, 85%, 80%, 75%, 70%, or 65%. The aperture ratio may be less than or equal to any one of the upper limits; or greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits and greater than or equal to any one of the lower limits. The aperture ratio of the first surface is as defined above.

[0185] In this case, the ratio (O2 / O1) of the aperture ratio (O1) at the first surface to the aperture ratio (O2) at the second surface of the light control film may be within a predetermined range. For example, the lower limit of the ratio (O2 / O1) may be approximately 1, 1.01, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, or 1.4, and the upper limit may be approximately 5, 4.5, 4, 3.5, 3, 2.5, 2, 1.5, 1.4, 1.3, 1.2, or 1.1. The ratio O2 / O1 may be less than or equal to any one of the upper limits; or greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits but greater than or equal to any one of the lower limits.

[0186] 11 is a schematic diagram of an OLED display of the above structure. Such an OLED display includes an OLED panel (1), a color filter (2), a polarizing layer (3) and the light control film (4), and the distance between the polarizing layer (3) and the first surface of the body of the light control film (4) is mainly determined by the adhesive layer or glue layer (3000) that adheres the light control film (4).

[0187] In the second embodiment, the lower limit of the distance between the polarizing layer and the first surface may be approximately 250 μm, 260 μm, 270 μm, 280 μm, 290 μm, 300 μm, 310 μm, 320 μm, 330 μm, 340 μm, or 350 μm, and the upper limit may be approximately 1000 μm, 900 μm, 800 μm, 700 μm, 600 μm, 500 μm, or 400 μm. The distance may be greater than or equal to any one of the lower limits; or may be less than or equal to any one of the upper limits, but greater than or equal to any one of the lower limits.

[0188] In the second embodiment, the refractive index N1 of the body and the refractive index N2 of the filling material may satisfy the relationship N1>N2.

[0189] In this case, the lower limit of the difference N1-N2 between the refractive indices N1 and N2 may be about 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, or 0.05, and the upper limit may be about 0.08, 0.075, 0.07, 0.065, 0.06, 0.055, 0.05, 0.045, 0.04, 0.035, 0.03, or 0.025. N1-N2 may be in a range equal to or less than any one of the upper limits; or equal to or greater than any one of the lower limits; or equal to or less than any one of the upper limits but equal to or greater than any one of the lower limits.

[0190] In such a case, the first surface of the body of the light control film may be positioned closer to the polarizing layer than the second surface, or the second surface may be positioned closer to the polarizing layer than the first surface.

[0191] In the second embodiment, the lower limit of the aperture ratio (aperture ratio of the transmissive region) on the first surface of the main body of the light control film may be approximately 60%, 65%, 70%, 75%, or 80%. The upper limit of the aperture ratio (aperture ratio of the transmissive region) on the first surface may be approximately 100%, 95%, 90%, 85%, 80%, 75%, 70%, or 65%. The aperture ratio may be less than or equal to any one of the upper limits; or greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits and greater than or equal to any one of the lower limits. The aperture ratio of the first surface is as defined above.

[0192] In this case, the ratio (O2 / O1) of the aperture ratio (O1) at the first surface to the aperture ratio (O2) at the second surface of the light control film may be within a predetermined range. For example, the lower limit of the ratio (O2 / O1) may be approximately 1, 1.01, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, or 1.4, and the upper limit may be approximately 5, 4.5, 4, 3.5, 3, 2.5, 2, 1.5, 1.4, 1.3, 1.2, or 1.1. The ratio O2 / O1 may be less than or equal to any one of the upper limits; or greater than or equal to any one of the lower limits; or less than or equal to any one of the upper limits but greater than or equal to any one of the lower limits.

[0193] 12 is a schematic diagram of an OLED display having the above structure. Such an OLED display includes an OLED panel (1), a color filter (2), a polarizing layer (3), a transparent substrate (5), and the light control film (4). The distance between the polarizing layer (3) and the first surface of the body of the light control film (4) is mainly determined by the adhesive layer (3000) that adheres the light control film (4) and the transparent substrate (5).

[0194] When the light control film is applied to an OLED display, by controlling the relationship of the refractive index according to the distance from the polarizing layer as described above, defects such as ghosts or moire and poor appearance that may be caused by the light control film can be prevented, and the light output angle can be precisely controlled, ensuring high transmittance, high brightness, and excellent resolution within the light output angle. [Effects of the Invention]

[0195] This specification discloses a light control film and a display device to which the light control film is applied. The light control film, when applied to a display device, enables precise control of the light output angle, ensuring high transmittance, high brightness, and excellent resolution within the light output angle, and blocking unwanted light that may cause defects such as ghosts or moire. When applied to an OLED display, the light control film can exhibit the above-mentioned performance while preventing defects such as stripes that are noticeable to a viewer. This specification also discloses a display device to which the light control film is applied. [Brief explanation of the drawings]

[0196] [Figure 1] 1 is a cross-sectional view of the body of an exemplary light control film of the present application. [Figure 2] 2 is a view of the main body when viewed in the normal direction of the first surface of the main body. [Figure 3] FIG. 10 is a diagram showing a state in which the grooves of the main body are filled with a filling material. [Figure 4] FIG. 2 is a diagram illustrating a first side and a second side of a groove. [Figure 5] FIG. 10 is a diagram for explaining sides A and B of a groove. [Figure 6] FIG. 10 is a diagram illustrating a specific shape of the end portion. [Figure 7] 10 is a diagram illustrating a light control film further including a base film. [Figure 8] 10 is a diagram of a light control film further including a pressure-sensitive adhesive layer or an adhesive layer. [Figure 9] This is an SEM image of the cross section of the light control film. [Figure 10] This shows the results of evaluating the brightness of the light control film at each viewing angle. [Figure 11] 1 is a diagram illustrating an OLED display to which a light control film is applied. [Figure 12] 1 is a diagram illustrating an OLED display to which a light control film is applied. DETAILED DESCRIPTION OF THE INVENTION

[0197] The light control film will be described in more detail below through examples and comparative examples, but the scope of the light control film is not limited by the following examples.

[0198] Manufacturing example 1. Manufacturing the light control film itself

[0199] The material for forming the body of the light control film (body material) was a curable compound, prepared by mixing modified bisphenol fluorine diacrylate (A) (Miwon Specialty Chemical, Miramer HR6100), trimethylolpropane triacrylate (TMPTA) (B), bisphenol A (EO)n diacrylate (C) (Cas No. 64401-02-1), ortho-phenyl phenyl ethyl acrylate (OPPEA) (D), and phenylbenzyl acrylate (PBA) (E) in a solvent-free form. The blending ratio of these materials (A:B:C:D:E) was approximately 10:6:23:13:13 by weight. An initiator (Darocur 1173, Ciba Specialty Chemicals) was further added to the material in a ratio of about 1 part by weight per 100 parts by weight of the total of the A to E components to produce the main body material.

[0200] The main body of the light control film was produced using the main body material. The main body was produced using the method disclosed in document WO2021 / 145469A1.

[0201] A base film (210) was fed while being unwound from a film feeder (10) disclosed in Figure 1 of the document, and the material was fed onto the base film (210) using a coating device (20) to form a resin layer (220'). The resin layer (220') was imprinted using a pattern forming mold (30), and then irradiated with light in a curing device (40) to harden it, thereby producing the main body of the light control film, which was then collected using a collection device (50).

[0202] Grooves of the desired shape were formed by controlling the mold shape of the pattern forming mold (30).

[0203] The light irradiation was carried out using a high-pressure metal halide lamp, and the irradiation wavelength ranged from 200 nm to 600 nm.

[0204] In this process, an OCF (Optical axis Control Film) (thickness: 125 μm) manufactured by SKC was used as the base film 210. The in-plane retardation of the base film was measured by the method described below and was about 11,000 nm to 14,000 nm.

[0205] The main body of the light control film formed according to Manufacturing Example 1 includes the base film and a main body formed on one side of the film, and the part of the main body that comes into contact with the base film becomes the second surface (1002 in Figure 1).

[0206] Preparation Example 2. Preparation of a filling material containing a light-absorbing material

[0207] The filler material was prepared by blending carbon black as a light-absorbing material into a resin material. The resin material was prepared by mixing aliphatic urethane diacrylate (Photomer 6210, Cognis) (F) and carbon black (single carbon black and carbon black powder made into acrylic beads) (G). The blending ratio of the materials was approximately 67:20 by weight (F:G).

[0208] 1. Refractive Index Measurement

[0209] Refractive index of the main body (transmitting area)

[0210] Two release-treated glass plates were separated by a gap spacer at a distance of about 100 μm, and the body material obtained in Preparation Example 1 was poured between the two glass plates and then cured. The curing was performed by irradiating light in the same manner as in Preparation Example 1. The refractive index of the cured material was measured. The refractive index was measured using an ABBE nD Brix DR-M4 refractometer at a reference wavelength of about 589 nm.

[0211] Refractive index of the absorption region

[0212] In the case of the filler material forming the absorption region, the refractive index is difficult to measure directly because it contains carbon black, an absorbent material. In this case, the refractive index of the final filler material can be determined by measuring the refractive index of the main body (transmission region) using a material with the same composition as the filler material but excluding the carbon black, in the same manner as measuring the refractive index of the main body (transmission region), taking into account the amount of added carbon black. According to the linear mixing rule, the refractive index due to the addition of carbon black increases by approximately 0.009 for every approximately 1 wt% increase in the amount of carbon black in the filler material. Therefore, the refractive index of the absorption region can be calculated based on this rule. The reference wavelength for the refractive index calculated in this example is the same as the reference wavelength for the refractive index of the main body.

[0213] 2. Measurement of tensile strength

[0214] The tensile strength was measured at room temperature (approximately 25°C) using a Universal Testing Machine (UTM) for test specimens approximately 45 mm wide, 12.5 mm long, and 2 mm thick. For example, the test specimens can be manufactured by curing the body material described in Preparation Example 1 to the above dimensions under the same curing conditions as in Preparation Example 1. The test specimens were secured to the device at both ends in the horizontal direction by approximately 8 mm, and the strength at which the test specimen broke was measured while the specimen was pulled in the horizontal direction at a speed of approximately 50 mm / sec. This strength was defined as the tensile strength. The tensile strength of the body material measured in this manner was approximately 13 MPa.

[0215] 3. Evaluation of elastic restoring force

[0216] The elastic recovery force of the test specimen used in the tensile strength measurement was evaluated using a pencil hardness tester. The test specimen was loaded into the pencil hardness tester, and a 2H hardness pencil was applied to the body with a load of approximately 300 g. The pencil was moved in one direction at a speed of 20 mm / sec to create a mark, and then the pencil was removed to check whether the mark disappeared. The test on the body showed that the mark created by the 2H hardness pencil disappeared within 10 seconds. The test was performed at room temperature (approximately 25°C).

[0217] 4. Evaluation of in-plane retardation of base film

[0218] The in-plane retardation value (Rin) of the base film was measured using an Agilent UV / VIS spectroscope 8453 with light of 550 nm wavelength. Two polarizers were placed in the UV / VIS spectroscope with their transmission axes perpendicular to each other. The base film was then placed between the two polarizers with its slow axis at a 45-degree angle to the transmission axes of the two polarizers, and the transmittance was measured as a function of wavelength. The phase retardation order of each peak was calculated from the transmittance graph as a function of wavelength. Specifically, the waveform in the transmittance graph as a function of wavelength satisfies the following formula A, and the maximum peak (Tmax) condition for the sine waveform satisfies the following formula B. In formula A, at λmax, T in formula A and T in formula B are the same, so the formula can be expanded. Expanding the formulas for n+1, n+2, and n+3, rearranging the formulas for n and n+1 to eliminate R, and rearranging n with the formulas for λn and λn+1 yields the following formula C. Since T in formula A and T in formula B are the same, n and λ are known, and R is calculated for each λn, λn+1, λn+2, and λn+3. A linear trend line of the R value by wavelength is found for the four points, and the R value for the formula 550 nm is calculated. The function of the linear trend line is Y=ax+b, where a and b are constants. Substituting 550 nm for x in the above function gives the Y value, which is the Rin value for light with a wavelength of 550 nm.

[0219] [Formula A] T = sin 2 [(2πR / λ)]

[0220] [Formula B] T = sin 2 [((2n+1)π / 2)]

[0221] [Formula C] n = (λn -3λn+1) / (2λn+1 +1-2λn)

[0222] In the above, R means an in-plane retardation (Rin), λ means a wavelength, and n means the order of the peak of the sine wave.

[0223] Example 1

[0224] The main body of the light control film was manufactured according to the method described in Manufacturing Example 1. The shape of the manufactured main body will be described with reference to the drawings. As shown in Figure 1, the main body was manufactured to have a first surface (1001) and a second surface (1002), and to include a plurality of grooves (1003) extending from the first surface (1001) to the second surface (1002) (in Figure 1, the base film is present on the second surface (1002) of the main body).

[0225] The grooves (1003) were formed so that when the body was observed from the first surface (1001), the grooves (1003) formed a straight line on the first surface (1001) as shown in Figure 2. At this time, the straight line was formed so as to form an angle of about 90 degrees with the slow axis of the base film.

[0226] In the structure, the pitch (P in FIG. 1) of the grooves (1003) is about 40 μm, the width (W1 in FIG. 1) of the grooves (1003) on the first surface (1001) is about 12 μm, the width of the end of the groove (1003) toward the second surface (1002) (W2 in FIG. 1, corresponding to the length of the opposing side (10) in FIG. 6 below) is about 6 μm, and the depth (H in FIG. 1) of the grooves is about 10 μm. T) was set to about 90 μm, and L in FIG. 1 was set to about 20 μm to 35 μm.

[0227] In the main body, the ratio of the area of ​​the absorbent region (total area of ​​the absorbent region having width W1 in Figure 1) to the entire area of ​​the first surface (1001) was approximately 30%. Therefore, the opening rate of the first surface (1001) was approximately 70%. Also, in the main body, the ratio of the area of ​​the absorbent region (total area of ​​the absorbent region having width W2 in Figure 1) to the entire area of ​​the second surface (1002) was approximately 15%. Therefore, the opening rate of the second surface (1002) was approximately 85%.

[0228] In FIG. 4 of the main body, the angles corresponding to the angles θ1 and θ2 are set to about 2.5 degrees.

[0229] The first surface (1001) between the grooves (1003) of the main body of the light control film was formed to have the shape shown in Figure 6. In Figure 6, the angle θ21 was set to about 87.5 degrees, and the angle θ11 was set to about 3 degrees. The length of the opposing side (10) in Figure 6 was about 6 μm, and the length of the inclined side (20) was about 11 μm.

[0230] The grooves (1003) of the main body were filled with the filler material prepared in Preparation Example 2 and cured to produce a light control film. The filler material was prepared in the same manner as in Preparation Example 2, but the amount of carbon black was adjusted so that the refractive index of the filler material (absorption region) was approximately 1.48. Because the refractive index of the main body (transmission region) was approximately 1.511 to 1.541, the difference between the refractive index N1 of the transmission region and the refractive index N2 of the absorption region was approximately 0.03 to 0.06. The filling material was filled using a scrubbing process. That is, the filler material was applied to the surface of the main body where the grooves were formed, and the applied filler material was pressed using a knife to introduce the filler material into the grooves. After that, the material other than that filled in the grooves was removed. The filling material was cured by irradiating it with light (ultraviolet light) taking into account the composition of the filler material.

[0231] Example 2.

[0232] The body of the light control film was formed in the same manner as in Example 1.

[0233] In this case, however, the grooves were formed into a multi-stage structure as shown in Figure 5. In Figure 5, the angle θA was approximately 3, and the angle θB was approximately 1.5. Also, in Figure 5, the length of the first side (10031A) was approximately 120 μm, and the length of the second side (10031B) was approximately 30 μm.

[0234] In the case of the main body, the opening ratio on the first surface (1001) was approximately 75.4%, the opening ratio on the second surface (1002) was approximately 91%, the groove pitch (the number corresponding to P in Figure 1 of Example 1) was approximately 61 μm, the width at the bottom of the groove (the number corresponding to W1 in Figure 1) was approximately 15 μm, and the width at the top of the groove (the number corresponding to W2 in Figure 1) was approximately 5.47 μm.

[0235] In addition, the depth of the groove of the main body (H in FIG. 1) T 1) was about 150 μm. In addition to the above, the angle between the linear shape of the grooves and the slow axis of the base film, and L in FIG.

[0236] The filling of the grooves (1003) of the body with the filling material was controlled in the same manner as in Example 1.

[0237] Comparative Example 1

[0238] A light regulating film was manufactured in the same manner as in Example 1, but a transparent resin material generally used in the manufacture of light regulating films was used as the material forming the main body, rather than the material used in Manufacturing Example 1. The tensile strength of this material was evaluated using the method described above, and was found to be approximately 5 MPa, and when evaluating the elastic recovery force, the mark did not disappear after the pencil was removed.

[0239] Test Example 1. Evaluation of filling rate and appearance

[0240] The filling characteristics of the filling material in the light regulating films of Example 1 and Comparative Example 1 were evaluated using SEM images. The cross sections of the light regulating films were photographed using a scanning electron microscope (SEM) (JEOL, JSM-7800F model) to evaluate the filling characteristics. The light regulating films were subjected to cross-section processing using a TXP pretreatment device and then photographed using the SEM. The BED-C observation mode was used, and the magnification, working distance, and acceleration voltage were 100x, 15 mm (working distance), and 15.0 kV, respectively. Figure 9 shows an image of Example 1 photographed in the same manner as above.

[0241] The depth of the regions unfilled with the filling material was confirmed for all grooves based on the SEM images for the light control films of Example 1 and Comparative Example 1. As shown in Figure 3, the depth of the regions unfilled with the filling material (200) was evaluated by measuring the shortest distance (D1, D2, etc. in Figure 3) from the first surface (1001) of the body to the filling material (200). In this case, the first surface used as the reference for the depth was an imaginary surface or line (1001I in Figure 3) connecting the first surfaces (1001) on both sides of the portion where the groove (1003) was formed. In addition, if there were two or more such shortest distances, the shortest distance used to calculate the average depth of the regions unfilled with the filling material was the longest of the two or more shortest distances (D2 in Figure 3).

[0242] The depth of the unfilled region of each groove measured in the same manner as above is summarized in Table 1 below.

[0243] [Table 1]

[0244] The results in Table 1 show that Example 1 has a smaller average depth of the unfilled region than Comparative Example 1, and the standard deviation of the depth is also smaller.

[0245] The light regulating films of Example 1 and Comparative Example 1 were evaluated for the presence or absence of defects in appearance. The presence or absence of defects in appearance was evaluated by observing the light regulating films at viewing angles up to 20 degrees, based on the normal direction of the surface of each light regulating film, and checking whether or not hairline defects, which are minute shading defects, were observed within the viewing angles. As a result, numerous hairline defects were observed within the viewing angles in Comparative Example 1, but no hairline defects were observed throughout the entire range of the viewing angles in Example 1. A similar evaluation was performed on Example 2, and the average depth of the unfilled regions was approximately 2.25 μm, with a standard deviation of approximately 0.18 μm, and no defects in appearance were observed in this case either.

[0246] Test Example 2. Luminance measurement by viewing angle

[0247] For the light control film of Example 1, the refractive index N2 of the absorptive region was fixed at 1.48, and the refractive index N1 of the transmissive region was changed while evaluating the brightness as a function of viewing angle. The results are shown in FIG.

[0248] The refractive index N1 of the transmission region can be changed by changing the composition of the main body material. Generally, the refractive index increases as the aromatic group content increases, so the refractive index can be adjusted by changing the ratio of modified bisphenol fluorine diacrylate (A), bisphenol A (EO)n diacrylate (C), ortho-phenyl phenyl ethyl acrylate (OPPEA) (D), and / or phenylbenzyl acrylate (PBA) (E) in the main body material.

[0249] In Figure 10, N-1 to N-6 are cases where the difference (N1-N2) between the refractive index N1 of the transmissive region and the refractive index N2 of the absorptive region is 1.48, 1.49, 1.50, 1.51, 1.52, and 1.53, respectively, and in Figure 10, the X axis is the viewing angle and the Y axis is the brightness. The results in Figure 10 confirm that the light transmission can be controlled according to the viewing angle through the light control film of the present application.

[0250] Example 3

[0251] A light control film was prepared in the same manner as in Example 1, and an adhesive layer was formed on the first surface of the light control film, which was then attached to an OLED to prepare the OLED panel shown in Figure 11. In the above, an acrylic OCA (Optically Clear Adhesive), which is commonly used for optical purposes, was used as the adhesive layer.

[0252] When applied to the structure of Figure 11, the refractive index of the main body of the light control film is set to approximately 1.511 to 1.541, and the refractive index of the filling material is adjusted by the amount of carbon black so that the difference (N1-N2) between the refractive index N1 of the transmission region and the refractive index N2 of the absorption region is approximately 0.03 to 0.06.

[0253] In addition, in the structure of Figure 11, the aperture ratio of the lower surface of the light control film (the surface in contact with the OCA in Figure 11) is approximately 70% to 74%, and the aperture ratio of the upper surface (the surface opposite the lower surface) is approximately 85% to 90%.

[0254] In the above structure, the thickness of the OCA was about 190 μm, so the distance between the first surface of the main body of the light control film and the polarizing layer was about 190 μm. In the above structure, the angle between the absorption axis of the polarizing layer (pol) and the linear shape formed by the grooves of the light control film (see Figure 2) was about 7 to 8 degrees.

[0255] The OLED having the above structure was evaluated for appearance defects according to Test Example 1, and the brightness according to the viewing angle according to Test Example 2. As a result, no appearance defects were observed, and it was confirmed that the transmittance control characteristics according to the viewing angle were ensured. In addition, defects such as ghost phenomenon were not observed.

[0256] Example 4.

[0257] A light control film was prepared in the same manner as in Example 1, and an adhesive layer was formed on the first surface of the light control film, which was then attached to an OLED to prepare an OLED panel as shown in Figure 12. The adhesive layer was an acrylic OCA (Optically Clear Adhesive), which is commonly used for optical purposes.

[0258] When applied to the structure of Figure 12, the refractive index N1 of the main body of the light control film is set to approximately 1.501 to 1.531, and the refractive index of the filling material is adjusted by the amount of carbon black so that the difference (N1-N2) between the refractive index N1 of the transmission region and the refractive index N2 of the absorption region is approximately 0.02 to 0.05.

[0259] In addition, in the structure below, the aperture ratio of the lower surface of the light control film (the surface in contact with the OCA in Figure 12) is approximately 68% to 72%, and the aperture ratio of the upper surface (the surface opposite the lower surface) is approximately 87% to 91%.

[0260] In the structure of Figure 12, the thickness of the OCA is approximately 25 μm and the thickness of the glass substrate is approximately 300 μm, so the distance between the first surface of the main body of the light control film and the polarizing layer is approximately 325 μm.

[0261] In the above structure, the angle formed by the absorption axis of the polarizing layer (pol) and the linear shape formed by the grooves of the light control film (see FIG. 2) was set to about 4 to 6 degrees.

[0262] The OLED having the above structure was evaluated for appearance defects according to Test Example 1, and the brightness according to the viewing angle according to Test Example 2. As a result, no appearance defects were observed, and it was confirmed that the transmittance control characteristics according to the viewing angle were ensured. In addition, defects such as ghost phenomenon were not observed.

Claims

1. a body having a first surface and a second surface opposite the first surface, the first surface having a plurality of grooves formed therein and extending toward the second surface; and the groove is filled with a filler material that includes a light-absorbing material; At the first and second surfaces, areas of the body where the grooves are not formed form transmissive areas, and filled areas form absorptive areas; the aperture ratio of the transmission region on the first surface is 60% or more; A light control film in which the aperture ratio of the transmission area on the second surface is 85% or more.

2. The light control film of claim 1, wherein the ratio O2 / O1 of the aperture ratio (O1) of the transmission area at the first surface to the aperture ratio (O2) of the transmission area at the second surface is in the range of 1 to 5.

3. 2. The light control film of claim 1, wherein in the plurality of grooves filled with the filling material, the average depth of the areas not filled with the filling material is in the range of 0 μm to 3 μm, and the standard deviation of the depth of the unfilled areas is 0.2 or less.

4. 2. The light control film of claim 1, wherein the absolute value of the difference between the refractive index N1 of the body and the refractive index N2 of the filler material is in the range of 0 to 0.

1.

5. In a cross section of the body, the groove has a first side extending from the first surface of the body toward the second surface of the body, and a second side opposite the first side and extending from the first surface toward the second surface; The light control film of claim 1, wherein a first angle formed between the first side and the normal direction of the first surface, and a second angle formed between the second side and the normal direction of the first surface are each within the range of 0 degrees to 10 degrees.

6. The light control film of claim 5 , wherein the first angle and the second angle are different from each other, the first angle being greater than or equal to 2 degrees, and the second angle being less than or equal to 2 degrees.

7. In a cross section of the body, the groove has a first side extending from the first surface of the body toward the second surface of the body, and a second side opposite the first side and extending from the first surface toward the second surface; The light control film of claim 1 , wherein the first side or the second side includes a side A that forms an angle A with the normal direction of the first surface and a side B that forms an angle B different from the angle A.

8. The side B is located closer to the second surface of the main body than the side A, The light control film of claim 7 , wherein angle A is 3 degrees or more and angle B is 2 degrees or less.

9. The light control film of claim 7, wherein R in the following formula 1 is in the range of 5% to 40%: [Formula 1] R = (100×L B× cosθ B ) / (L A× cosθ A +L B× cosθ B ) In Equation 1, L A is the length of the side A, and L B is the length of the side B, and θ A is the angle A, and θ B is the angle B.

10. The depth of the groove formed in the body is within a range of 50 μm to 200 μm, The pitch of the plurality of grooves formed in the body is within a range of 10 μm to 100 μm, The light control film of claim 1 , wherein the width of the groove formed on the first surface of the body is in the range of 1 μm to 50 μm.

11. The light control film of claim 1 , wherein the main body has a tensile strength of 7 MPa or more.

12. 10. The light control film of claim 1, wherein the body comprises an acrylic polymer containing one or more bonds selected from the group consisting of bonds of the following Chemical Formula 1 and bonds of the following Chemical Formula 2: 【Chemistry 1】 In Chemical Formula 1, R 1 is a single bond, an alkylene group, or an alkylidene group: 【Chemistry 2】 In Chemical Formula 2, R 2 is an alkylene or alkylidene group, and n is a number in the range of 1 to 50.

13. The light control film of claim 12 , wherein the acrylic polymer comprises acrylate units having one or more bonds selected from the group consisting of bonds of Chemical Formula 1 and bonds of Chemical Formula 2.

14. The light control film of claim 13, wherein the ratio of acrylate units containing bonds of Chemical Formula 1 is in the range of 20% by weight to 90% by weight, based on the total weight of acrylate units contained in the acrylic polymer.

15. The light control film of claim 13, wherein the ratio of acrylate units containing bonds of Chemical Formula 2 is in the range of 5% by weight to 40% by weight, based on the total weight of acrylate units contained in the acrylic polymer.

16. 14. The light control film of claim 13, wherein the proportion of the multifunctional acrylate unit is in the range of 5% to 80% by weight, based on the total weight of the acrylate units contained in the acrylic polymer.

17. an organic light-emitting panel; and An organic light emitting device comprising the light control film of claim 1 disposed on a viewing side of the organic light emitting panel.

18. 18. The organic light-emitting device of claim 17, further comprising a polarizing layer on the viewing side, the light control film being disposed between the polarizing layer and the organic light-emitting panel or on the surface of the polarizing layer opposite to the surface facing the organic light-emitting panel.

19. the first surface of the body of the light control film is positioned closer to the polarizing layer than the second surface; the distance between the polarizing layer and the first surface is 250 μm or less; 19. The organic light-emitting device of claim 18, wherein the difference N1-N2 between the refractive index N1 of the body and the refractive index N2 of the filler material is in the range of 0.03 to 0.

06.

20. the first surface of the body of the light control film is positioned closer to the polarizing layer than the second surface; the distance between the polarizing layer and the first surface is greater than 250 μm; 19. The organic light-emitting device of claim 18, wherein the difference N1-N2 between the refractive index N1 of the body and the refractive index N2 of the filler material is in the range of 0.02 to 0.05.

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