Light control film

Abstract

The present specification discloses a light control film and a display device using the same. When the light control film is applied to the display device, the light control film enables accurate control of a light emission angle, can secure high transmittance, high brightness, and excellent resolution within the light emission angle, and blocks unnecessary light capable of causing defects such as so-called ghosting or moire fringes. Even when the light control film is applied to an OLED display, the light control film exhibits the above performance while preventing the occurrence of defects such as streaks that can be recognized by an observer. The invention further discloses a display device using the light control film.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0180437, filed on December 21, 2022, the disclosure of which is incorporated herein by reference in its entirety.

[0002] This specification discloses a light control film and a display device using the light control film. Background Art

[0003] Light control films, also known as light collimating films, are configured to control light transmittance and the direction of light emission in a display device.

[0004] As display devices, LCD (Liquid Crystal Display) or OLED (Organic Light Emitting Diode) are known. Such display devices are generally designed to ensure a wide viewing angle. However, when viewing the display device in a public place, for example, it may be necessary to prevent the display screen from being exposed to people around. In addition, in the case of vehicle displays, the width of the display's viewing angle and / or the direction of light emission need to be adjusted according to the display's location, taking into account the impact on the driver and the convenience of passengers.

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

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

[0007] These light control films need to precisely control the light emission angle within which high transmittance, high brightness, and excellent resolution are ensured, while blocking unnecessary light that causes defects such as so-called ghosts or moire.

[0008] In addition to the above properties generally required of light management films, additional properties may be required as the types of displays diversify.

[0009] Most light management films known to date are designed for LCDs.

[0010] In the case of LCDs, a light control film is placed between the liquid crystal panel and the backlight. In this manner, in LCDs, the light control film is placed relatively inward of the screen onto which the image is projected, and is positioned adjacent to the backlight, which generates strong light. Furthermore, in addition to the light control film, a diffuser film or a prismatic film, etc., may be placed between the liquid crystal panel and the backlight.

[0011] Therefore, in the case of an LCD, even when a light control film is applied, an observer does not recognize defects such as unnecessary stripes caused by the light control film.

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

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

[0014] In this way, in OLED displays, the light control film is positioned relatively close to the viewer. Furthermore, in the case of OLEDs, they are self-luminous elements, without any components that emit strong light (such as LCD backlights). Therefore, when a light control film is applied to an OLED display, the viewer can easily identify defects such as unwanted streaks caused by the light control film.

[0015] [Prior art literature]

[0016] [Patent Document]

[0017] (Patent Document 1) Japanese Patent Publication No. 2006-171701 Summary of the Invention

[0018] Technical issues

[0019] This specification discloses a light control film and a display device using the light control film. This specification aims to disclose a light control film that can control the light emission angle and ensure high transmittance, high brightness, and excellent resolution within the light emission angle without causing defects such as so-called ghosting or moiré fringes in the display device.

[0020] This specification aims to disclose that the light control film exhibits the above performance while preventing defects such as streaks that can be recognized by an observer from occurring even when the light control film is applied to an OLED display.

[0021] This specification discloses a display device using the light control film.

[0022] Technical Solution

[0023] Among the physical properties mentioned in this specification, when the measurement temperature affects the relevant physical properties, the physical properties are measured at room temperature unless otherwise specified.

[0024] The term room temperature is a natural temperature without warming or cooling, which may mean, for example, any temperature within the range of about 10°C to 30°C, or a temperature around about 23°C or about 25°C.

[0025] In this specification, unless otherwise specified, the unit of temperature is ° C.

[0026] In the terms used to define angles in this specification, the terms vertical, parallel, orthogonal, and horizontal, as well as the numerical values of any particular angle, should be interpreted taking into account manufacturing errors, etc. Therefore, the terms and numerical values of angles mean substantially vertical, substantially parallel, substantially orthogonal, or substantially horizontal, and the numerical values of the angles within the range that does not impair the desired effect. The range of vertical, parallel, orthogonal, or horizontal, and numerical values includes errors such as manufacturing errors or variations. For example, the corresponding situation can include an error within about ± 3 degrees, an error within about ± 2 degrees, an error within about ± 1 degree, an error within about ± 0.8 degrees, an error within about ± 0.6 degrees, or an error within about ± 0.4 degrees.

[0027] Unless otherwise specified, the angle formed by any two directions or sides mentioned herein may be the smaller of the angles measured in the clockwise and counterclockwise directions from either of the two directions or sides. Therefore, unless otherwise specified, the angles mentioned herein are positive numbers. To indicate the direction of measurement between angles measured in the clockwise or counterclockwise directions, an angle measured in the clockwise direction may be expressed as a positive number, and an angle measured in the counterclockwise direction may be expressed as a negative number, if necessary.

[0028] Unless otherwise specified herein, angles are in degrees.

[0029] Unless otherwise indicated herein, refractive indices are referenced to a wavelength of approximately 589 nm.

[0030] This specification discloses light management films.

[0031] The light control film includes a body having grooves formed therein and a filling material present in the grooves of the body.

[0032] Figure 1 is an exemplary cross-sectional view of a light management film 100 including a body and a filler material 200 .

[0033] like Figure 1As shown, the main body of light control film 100 has a first surface 1001 and a second surface 1002 facing first surface 1001. When the light control film is applied to a display device, one of first surface 1001 and second surface 1002 can be a light input surface, and the other surface can be a light output surface. First surface 1001 and second surface 1002 can be formed to be substantially parallel to each other. For example, in a cross-section of the light control film, the angle formed by first surface 1001 and second surface 1002 can be in the range of approximately 0 degrees to 10 degrees.

[0034] like Figure 1 As shown, a plurality of grooves 1003 extending in a direction toward a second surface 1002 are formed on a first surface 1001 of the main body of the light control film 100 .

[0035] Filling material 200 exists inside such groove 1003, and the filling material contains light absorbing material. In the case of such a structure, the main body and filling material 200 filled in groove 1003 can form a transmissive region and an absorbing region, and the transmissive region and the absorbing region are alternately repeated along the direction forming the first surface 1001 or the second surface 1002 in the cross section.

[0036] For example, areas of the first and second surfaces or body of the light management film where filler material 200 is not present may form transmissive regions, while areas where filler material 200 is present may form absorptive regions.

[0037] The absorption region can absorb or block the incident light that deviates from the expected light exit angle among the light incident on the light input surface, or change the direction of the light through total reflection.

[0038] In one example, Figure 2 As shown, when the first surface 1001 of the body in the light control film 100 is viewed in a normal direction of the first surface 1001 , the groove 1003 may be formed to show a straight line shape.

[0039] In the light control film, the grooves 1003 are filled with the filling material 200 at an excellent filling rate, and each of the plurality of grooves 1003 is uniformly filled with the filling material.

[0040] Existing light control films are also constructed by filling the grooves of a body having grooves with a filling material containing a light absorbing material, but if the grooves have been filled with the filling material to above a certain level, no attention is paid to the specific filling rate, and there is little consideration of the uniformity of the filling material filled in each of the multiple grooves.

[0041] Since existing light control films are mainly designed for LCDs, this is because even if the filling rate of the filling material is reduced or there is a certain degree of non-uniformity, the resulting appearance defects are not recognized by the observer.

[0042] However, when a 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 an observer is likely to recognize defects caused by the light control film.

[0043] In the light control film, the average value and standard deviation of the depths of regions not filled with the filling material in the plurality of grooves filled with the filling material may be controlled.

[0044] The depth of the area not filled with fill material will be referenced to Figure 3 To describe. Figure 3 To show Figure 1 FIG. 1 is a diagram of an enlarged cross-section of one groove 1003 among a plurality of grooves 1003 in light control film 100 .

[0045] like Figure 3 As shown, the depth of the region not filled with the filling material 200 is the shortest distance from the first surface 1001 of the main body to the filling material 200 ( Figure 3 D1, D2, etc. in FIG. 1 ). The first surface serving as a standard for the depth is a virtual surface or line connecting the first surfaces 1001 existing on both sides of the portion forming the groove 1003 ( Figure 3 1001I in).

[0046] like Figure 3 As shown, when there are two or more shortest distances, the shortest distance in calculating the average depth of the region not filled with the filling material is the longest distance of the two or more shortest distances (in Figure 3 In the case of D2), the average depth of the region not filled with the filling material can be obtained by obtaining the shortest distance of each of the plurality of grooves formed in the body and performing arithmetic averaging thereof.

[0047] The lower limit of the average depth of the regions not filled 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 depth may be approximately 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 depth may also be adjusted to be less than, equal to, or less than any of the aforementioned upper limits; or to be less than, equal to, or less than any of the aforementioned upper limits while being greater than, equal to, or greater than any of the aforementioned lower limits.

[0048] The upper limit of the standard deviation of the depth of the regions not filled with the filling material in the plurality of grooves can be approximately 0.2, 0.19, 0.18, 0.17, or 0.16, and the lower limit of the standard deviation can be approximately 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 can also be adjusted to be less than, equal to, or less than any of the aforementioned upper limits; or less than, equal to, or less than any of the aforementioned upper limits while being greater than, equal to, or greater than any of the aforementioned lower limits. The standard deviation can be expressed in μm.

[0049] In the light control film, the filling rate and filling uniformity of the filling material in the groove are controlled as described above. Therefore, even when the light control film is applied to a device (such as an OLED display) in which the light control film is disposed adjacent to an observer, the light control film does not cause appearance defects caused by the light control film.

[0050] In order to achieve the filling rate and filling uniformity, at least one, or two or more of the tensile strength of the body, the elastic restoring force of the body, and the shape of the groove may be controlled as described below.

[0051] The shape of the grooves can be variously controlled to achieve desired light management properties and / or filling characteristics.

[0052] like Figure 4 As shown, in a cross section of the body of light control film 100 , the groove may 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 facing the first side 10031 and extending toward the second surface 1002 .

[0053] As described above, when the groove has a straight line shape when viewing the first surface 1001 in the normal direction of the body, the cross section may be a cross section perpendicular to the straight line shape of the groove and in a direction parallel to the normal direction of the first surface 1001 .

[0054] like Figure 4 As shown, the groove may form a first angle ( Figure 4 θ1 in ), and a second angle ( Figure 4 θ2 in θ).

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

[0056] For example, the lower limit of the first angle can be about 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 can also be about 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 can be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0057] For example, the lower limit of the second angle can be about 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 can also be about 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 can be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0058] The first angle and the second angle may be adjusted in consideration of desired light control performance and / or filling characteristics, etc.

[0059] The first angle and the second angle may be the same as or different from each other.

[0060] When the first angle and the second angle are different from each other, the first angle may be 2 degrees or greater, and the second angle may be 2 degrees or less. In the above 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.

[0061] When the first angle and the second angle are different from each other, the lower limit of the first angle may be approximately 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, or 4 degrees, and the upper limit thereof may be 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, or 2 degrees. The first angle may also be within a range greater than, equal to, or greater than any of the aforementioned lower limits; or within a range less than, equal to, or less than any of the aforementioned upper limits, and at the same time within a range greater than, equal to, or greater than any of the aforementioned lower limits.

[0062] When the first angle and the second angle are different from each other, the upper limit of the second angle may be approximately 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees, and the lower limit thereof may be approximately 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, or 2 degrees. The second angle may also be within a range less than or equal to, or less than, any of the aforementioned upper limits; or within a range less than or equal to, or less than, any of the aforementioned upper limits and greater than or equal to, or greater than, any of the aforementioned lower limits.

[0063] In one example, the angles formed by the first side or the second side of the groove and the normal direction of the first surface may be two or more.

[0064] Figure 5 is to show an example of such a shape. Figure 5 The case where both the first side 10031 and the second side 10032 form two angles with the normal direction of the first surface 1001 is shown, but the present invention is not limited thereto. 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, while the other side may form only one angle, and one or more sides may also form three or more angles with the normal direction.

[0065] like Figure 5 As shown in the 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 an angle A( Figure 5 The side A (10031A, 10032A) of θA) and the angle B ( Figure 5 Side B (10031B, 10032B) of θB).

[0066] When side B (10031B, 10032B) is positioned closer to the second surface 1002 of the body than side A (10031A, 10031B), angle A ( Figure 5 θA) can be greater or less than angle B ( Figure 5 θB in ).

[0067] When angle A is smaller than angle B, angle A ( Figure 5 θA) in can be 2 degrees or less, and angle B ( Figure 5 θB) in can be 2 degrees or more. Here, when the angle A ( Figure 5 When θA) in is 2 degrees, angle B ( Figure 5 θB) in can be greater than 2 degrees; and when angle B ( Figure 5 When θB) in is 2 degrees, angle A ( Figure 5 The θA) in can be less than 2 degrees.

[0068] Here, angle B( Figure 5 The lower limit of θB) in the figure may be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, or 4 degrees, and the upper limit thereof may be about 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, or 2 degrees. Angle B may also be within a range greater than, equal to, or greater than any of the aforementioned lower limits; or within a range less than, equal to, or less than any of the aforementioned upper limits, and within a range greater than, equal to, or greater than any of the aforementioned lower limits.

[0069] Here, the angle A( Figure 5 The upper limit of θA) in the figure may be approximately 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees, and the lower limit thereof may be approximately 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, or 2 degrees. The angle A may also be within a range less than, equal to, or less than any of the aforementioned upper limits; or within a range less than, equal to, or less than any of the aforementioned upper limits and greater than, equal to, or greater than any of the aforementioned lower limits.

[0070] When angle A is greater than angle B, angle B ( Figure 5 θB) in can be 2 degrees or less, and angle A ( Figure 5 θA) in can be 2 degrees or more. When angle B ( Figure 5 When θB) in is 2 degrees, angle A ( Figure 5 θA) in can be greater than 2 degrees; and when angle A ( Figure 5 When θA) in is 2 degrees, angle B ( Figure 5 θB) in can be less than 2 degrees.

[0071] Here, the angle A( Figure 5 The lower limit of θA) in the figure may be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees, or 4 degrees, and the upper limit thereof may be about 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees, or 2 degrees. The angle A may also be within a range greater than, equal to, or greater than any of the aforementioned lower limits; or within a range less than, equal to, or less than any of the aforementioned upper limits, while also within a range greater than, equal to, or greater than any of the aforementioned lower limits.

[0072] Here, angle B( Figure 5 The upper limit of θB) in the figure may be approximately 2 degrees, 1.5 degrees, 1 degree, or 0.5 degrees, and the lower limit thereof may be approximately 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees, or 2 degrees. Angle B may also be within a range less than, equal to, or less than any of the aforementioned upper limits; or within a range less than, equal to, or less than any of the aforementioned upper limits and greater than, equal to, or greater than any of the aforementioned lower limits.

[0073] As described above, when the first side or the second side of the groove includes the side A and the side B, R of the following Formula 1 may be within a predetermined range.

[0074] [Formula 1]

[0075] R=(100×L B ×cosθ B ) / (L A ×cosθ A +L B ×cosθ B )

[0076] In formula 1, L A and L B are the lengths of side A and side B, and θ A and θ B They are angle A and angle B respectively.

[0077] In formula 1, L A and L B There is no restriction on the units, as long as the same units are applied to each other.

[0078] The lower limit of R in Formula 1 may be approximately 5%, 10%, 15%, 20%, 25%, 30%, 35%, or 40%, and the upper limit thereof may be approximately 40%, 35%, 30%, 25%, 20%, 15%, 10%, or 5%. R in Formula 1 may also be within a range less than or equal to, or less than, any of the aforementioned upper limits; or within a range greater than or equal to, or greater than, any of the aforementioned lower limits; or within a range greater than or equal to, or greater than, any of the aforementioned lower limits, and within a range less than or equal to, or less than, any of the aforementioned upper limits.

[0079] The groove having such a shape may be suitable for ensuring desired light control performance and filling characteristics.

[0080] To ensure desired filling characteristics, etc., the shape of the surface of the body, in particular the shape of the first surface between the grooves, may be controlled.

[0081] For example, Figure 6As shown, in a cross section of the body, a first surface 1001 between the grooves may include: an opposing side 10; a first inclined side 20, one end of which is connected to one of the ends of the opposing side 10 and forms an angle θ11 with the opposing side 10; and a second inclined side 30, one end of which is connected to an end of the first inclined side 20 that is not connected to the opposing side 10 and forms an angle θ21 with the opposing side 10. Here, the opposing side 10 may be, for example, a first surface 1001 that is substantially horizontal with a second surface 1002 of the body.

[0082] By forming the above structure, the filling and taking-out characteristics of the filling material during the manufacturing process of the light control film can be improved, and thus the above-mentioned filling rate and filling uniformity can be effectively ensured, and furthermore, the surface characteristics of the light control film can be stably maintained.

[0083] As described above, when the groove has a straight line shape when viewing the first surface 1001 in the normal direction of the body, the cross section may be a cross section perpendicular to the straight line shape of the groove and in a direction parallel to the normal direction of the first surface 1001 .

[0084] The opposing side 100 can form an angle 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 with the side formed by the second surface 1002 in the cross section.

[0085] The angle θ11 and the angle θ21 may be different from each other.

[0086] In one example, the lower limit of the above angle θ11 can be about 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 its upper limit can also be about 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 can also be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0087] Here, the lower limit of the ratio θ21 / θ11 of the angle θ21 to θ11 can be approximately 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 thereof can be approximately 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 also be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0088] In the above structure, H according to the following formula 2 can be adjusted.

[0089] [Formula 2]

[0090] H=L×sinθ11

[0091] In Formula 2, L is the length of the first inclined side, and θ11 is the angle formed by the opposite side and the first inclined side.

[0092] The upper limit of H can be approximately 3 μm, 2.5 μm, 2 μm, 1.5 μm, 1 μm, or 0.5 μm. The lower limit of H can also be approximately 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 can also be within a range less than, equal to, or less than any of the aforementioned upper limits; or within a range greater than, equal to, or greater than any of the aforementioned lower limits; or within a range greater than, equal to, or greater than any of the aforementioned lower limits, and within a range less than, equal to, or less than any of the aforementioned upper limits.

[0093] In the above structure, the total depth of the groove ( Figure 1 H in T ) and the ratio H of the above formula 2 T The lower limit of the ratio 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. TThe upper limit of the ratio 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 can also be in the range of less than or equal to, or less than any one of the above upper limits; or in the range of greater than or equal to, or greater than any one of the above lower limits; or in the range of greater than or equal to, or greater than any one of the above lower limits, and at the same time in the range of less than or equal to, or less than any one of the above upper limits.

[0094] In the above structure, if the length of the opposite side is T, T may be adjusted so that the value K of the following formula 3 is within a predetermined range.

[0095] [Formula 3]

[0096] K=T / (T+2×cosθ11×L)

[0097] In Formula 3, T is the length of the opposite side, L is the length of the first inclined side, and θ11 is the angle formed by the opposite side and the first inclined side.

[0098] In Formula 3, there is no limitation on the units of T and L as long as the same units are applied to each other.

[0099] The lower limit of K in Formula 3 may be approximately 0.01, 0.05, 0.1, 0.15, or 0.2, and the upper limit thereof may be approximately 2, 1.5, 1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, or 0.25. K may also be in a range less than or equal to, or less than, any of the aforementioned upper limits; or in a range greater than or equal to, or greater than, any of the aforementioned lower limits; or in a range greater than or equal to, or greater than, any of the aforementioned lower limits, and in a range less than or equal to, or less than, any of the aforementioned upper limits.

[0100] By applying such a structure, desired filling characteristics can be achieved more effectively.

[0101] The depth of the groove formed in the body ( Figure 1 H in T) is not particularly limited and can be adjusted in consideration of desired performance. The lower limit of the depth can 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 can also 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 also be within a range less than or equal to, or less than, any of the aforementioned upper limits; or within a range greater than or equal to, or greater than, any of the aforementioned lower limits; or within a range greater than or equal to, or greater than, any of the aforementioned lower limits and less than or equal to, or less than, any of the aforementioned upper limits. When there are a plurality of grooves and the depth of the relevant grooves is not constant, the depth of the groove may be the arithmetic mean of the depths of the plurality of grooves.

[0102] The spacing of the plurality of grooves formed in the body can also be adjusted in consideration of the desired performance. Here, the spacing is the distance from the starting point of one groove on the first surface 1001 to the starting point of another groove adjacent to the groove, such as Figure 1 The lower limit of the pitch may be, for example, approximately 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 also be, for example, approximately 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 there are a plurality of grooves and the spacing between the related grooves is not constant, the spacing between the grooves may be the arithmetic mean of the spacings of the plurality of grooves. The spacing of the grooves can also be within a range of less than or equal to, or less than any of the above upper limits; or within a range of greater than or equal to, or greater than any of the above lower limits; or within a range of greater than or equal to, or greater than any of the above lower limits, and at the same time within a range of less than or equal to, or less than any of the above upper limits.

[0103] The width of the groove formed in the body can also be adjusted taking into account the desired performance. Here, the width is the size of the groove determined on the first surface 1001 of the cross section of the body, such as Figure 1As shown in W1 in . The lower limit of the width can 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 can also be around 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 there are multiple grooves and the width of the relevant grooves is not constant, the width of the groove can be the arithmetic mean of the widths of the multiple grooves. The width of the groove can also be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0104] 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) can be, for example, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, or 30 μm. The upper limit of the difference (P-W1) can also 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 a plurality of grooves, the difference (P-W1) can be an arithmetic mean. The difference (P-W1) may also be within a range of less than or equal to, or less than any of the above upper limits; or within a range of greater than or equal to, or greater than any of the above lower limits; or within a range of greater than or equal to, or greater than any of the above lower limits, and at the same time within a range of less than or equal to, or less than any of the above upper limits.

[0105] The aperture ratio in the light control film can be controlled.

[0106] In one example, the lower limit of the aperture ratio (aperture ratio of the transmission area) on the first surface of the main body may be about 60%, 65%, 70%, 75% or 80%. In another example, the upper limit of the aperture ratio (aperture ratio of the transmission area) on the first surface may be about 100%, 95%, 90%, 85%, 80%, 75%, 70% or 65%. The aperture ratio may also be in a range less than or equal to, or less than any of the above upper limits; or in a range greater than or equal to, or greater than any of the above lower limits; or in a range greater than or equal to, or greater than any of the above lower limits, and at the same time in a range less than or equal to, or less than any of the above upper limits. The aperture ratio of the first surface is the ratio of the area of the transmission area formed on the first surface to the total area of the first surface, and for example, with reference to Figure 1 , which is the area of the transmission region formed on the first surface ( Figure 1 The ratio of the area of the first surface 1001 excluding the region forming the width W1 to the total area of the first surface 1001.

[0107] In one example, the lower limit of the aperture ratio (aperture ratio of the transmission area) on the second surface of the main body may be about 60%, 65%, 70%, 75%, 80%, 85% or 90%. The upper limit of the aperture ratio (aperture ratio of the transmission area) on the second surface may be less than 100%, 95% or less, 90% or less, 85% or less, or about 80% or less. The aperture ratio may also be in a range of less than or equal to, or less than any of the above upper limits; or in a range of greater than or equal to, or greater than any of the above lower limits; or in a range of greater than or equal to, or greater than any of the above lower limits, and at the same time in a range of less than or equal to, or less than any of the above upper limits. The aperture ratio of the second surface is the ratio of the area of the transmission area formed on the second surface to the total area of the second surface, and for example, with reference to Figure 1 , which is the area of the transmission region formed on the first surface ( Figure 2 The ratio of the area of the second surface 1002 excluding the area forming the width W2 to the total area of the second surface 1002.

[0108] In the main body, the ratio (O2 / O1) of the aperture ratio (O2) on the second surface to the aperture ratio (O1) on the first surface can be within a predetermined range. For example, the lower limit of the ratio (O2 / O1) can be around 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 can be around 5, 4.5, 4, 3.5, 3, 2.5, 2, or 1.5. The ratio O2 / O1 can also be within a range less than or equal to, or less than, any one of the above upper limits; or within a range greater than or equal to, or greater than, any one of the above lower limits; or within a range greater than or equal to, or greater than, any one of the above lower limits and at the same time within a range less than or equal to, or less than, any one of the above upper limits.

[0109] The refractive index relationship between the main body (transmission region) and the filling material (absorption region) can be adjusted in consideration of the desired light control performance. At this time, the application of the light control film can be considered to determine the refractive index relationship.

[0110] 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, the above 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 the relationships can be satisfied according to the application purpose.

[0111] In the light control film, the upper limit of the absolute value of the difference between the refractive indices N1 and N2 can 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 can be around 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 refractive index difference can also be within a range less than or equal to, or less than, any one of the above upper limits; or within a range greater than or equal to, or greater than, any one of the above lower limits; or within a range greater than or equal to, or greater than, any one of the above lower limits and at the same time within a range less than or equal to, or less than, any one of the above upper limits.

[0112] When N1 and N2 satisfy the relationship of N1 > N2, the relationship of N1 = N2, or the relationship of N1 < N2, the absolute value of the refractive index difference can be within the above range.

[0113] As described above, according to the application purpose of the light control film, any one of the three types of refractive index relationships described above and any combination within any one of the ranges of the absolute value of the refractive index difference described above can be satisfied.

[0114] The refractive indices N1 and N2 can be measured by the method described in “1. Measurement of refractive index” in the Example section of this specification.

[0115] The material constituting the body of the light control film is not particularly limited. Generally, in a light control film, the body can be formed by curing an acrylate material, and the body formed by such a method can also be applied to the present application.

[0116] In one example, in order to improve the filling characteristics (filling rate and filling uniformity) of the above-mentioned filling material, a body having improved tensile strength and elastic restoring force may be used as the body.

[0117] During the manufacture of the light control film, a so-called scraping process can be applied to fill the grooves of the main body with a filling material. In this process, the filling material is filled into the grooves while the main body is compressed using a compression device such as a knife. In this process, the filling rate can be increased by reducing the degree of compression of the main body due to its high strength.

[0118] The rate at which the body recovers after being compressed when the pressure due to compression by the compression device disappears also affects the filling rate, so it is recommended to use a body having an appropriate level of elastic restoring force.

[0119] In one example, the lower limit of the tensile strength of the body can 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. The upper limit of the tensile strength of the body can also 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 also be within a range less than or equal to, or less than, any of the aforementioned upper limits; or within a range greater than or equal to, or greater than, any of the aforementioned lower limits; or within a range greater than or equal to, or greater than, any of the aforementioned lower limits, and less than or equal to, or less than, any of the aforementioned upper limits. This tensile strength can be measured according to the method described in "2. Measurement of Tensile Strength" in the Examples section of this specification.

[0120] To achieve the fill rate described below, it may be desirable for the body to have an appropriate elastic restoring force. For example, in a test using a pencil hardness tester, when a 2H hardness pencil is pressed under a load of 300g to leave a mark, and then the pencil is removed, a body having a level of restoring force at which the mark left by the pencil disappears within 1 minute, 50 seconds, 40 seconds, 30 seconds, 20 seconds, or 10 seconds may be suitable for forming a desired light control film. Restoring force can be evaluated using the method described in "3. Evaluation of Elastic Restoring Force" in the Examples section of this specification.

[0121] The material forming the body can be controlled to ensure the above characteristics.

[0122] In one example, the body can include an acrylic polymer.

[0123] The term acrylic polymer means a crosslinked product, a polymerized product, or a crosslinked and polymerized product of acrylic acid esters.

[0124] The term acrylate means a monomer, oligomer or other precursor having one or more (meth)acryloyl groups and forming an acrylic polymer by polymerization and / or crosslinking, and examples thereof include acrylic acid, methacrylic acid, acrylate or methacrylate, and the like.

[0125] In this specification, the term (meth)acryloyl means an acryloyl group or a methacryloyl group.

[0126] Regarding the content of the acrylic polymer in the main body, the lower limit may be approximately 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% by weight, based on the total weight of the main body, and the upper limit may be approximately 100%, 99%, or 98% by weight. This ratio may also be within a range of greater than, equal to, or greater than any of the aforementioned lower limits; or within a range of greater than, equal to, or greater than any of the aforementioned lower limits and less than, equal to, or less than any of the aforementioned upper limits.

[0127] In one example, the acrylic polymer may include specific types of bonding moieties to ensure tensile strength and / or recovery properties as described above.

[0128] For example, the acrylic polymer may include a bonding portion represented by the following Formula 1 and / or a bonding portion represented by the following Formula 2. The acrylic polymer may include either one of the bonding portions of the following Formulas 1 and 2, or may include both.

[0129] [Formula 1]

[0130]

[0131] In Formula 1, R1 is a single bond, an alkylene group, or an alkylidene group.

[0132] In Formula 1, the case where R1 is a single bond means that R1 does not exist, and the benzene rings on both sides of R1 are directly connected to form a biphenyl structure.

[0133] In the structure of Formula 1, the benzene structure, the alkylene group and / or the alkylidene group may be optionally substituted with one or more substituents, if necessary.

[0134] [Formula 2]

[0135]

[0136] In Formula 2, R2 is an alkylene group or an alkylidene group, and n is any number.

[0137] The lower limit of n in Formula 2 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 also be in a range greater than, equal to, or greater than any of the above lower limits, while being in a range less than, equal to, or less than any of the above upper limits.

[0138] In Formula 1 and Formula 2, the term alkylene means a functional group in which two hydrogen atoms are separated from an alkane and connected to another object, wherein the two hydrogen atoms are separated from different carbon atoms of the alkane. Such an alkylene group can 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. Such an alkylene group can be linear, branched, or cyclic. Such an alkylene group can also be optionally substituted with one or more substituents. In particular, the alkylene group in Formula 1 can also be optionally substituted with one or more halogens. In this case, the halogen used can be exemplified by fluorine, chlorine, or iodine, but is not limited thereto.

[0139] In this specification, unless otherwise indicated, the term alkylidene is a functional group in which two hydrogen atoms are separated from an alkane and connected to another object, which means a structure in which two hydrogen atoms are separated from one carbon atom of an alkane. Such an alkylidene can be an alkylidene 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 an alkylidene can be linear, branched or cyclic. Such an alkylidene can also optionally be substituted with one or more substituents. In particular, the alkylidene in Formula 1 can also optionally be substituted with one or more halogens. In this case, the halogen used can be exemplified by fluorine, chlorine or iodine, but is not limited thereto.

[0140] The bonding portion may help the body exhibit an appropriate level of tensile strength and / or recovery properties, and may also help adjust the refractive index of the body to an appropriate level.

[0141] The method of introducing the above bonding moiety into the acrylic polymer is not particularly limited.

[0142] For example, a method of forming an acrylic polymer using a monomer having such a bonding portion in its molecular structure as an acrylic ester can be applied.

[0143] Therefore, the acrylic polymer may include an acrylate unit having a bonding moiety of Formula 1 above, an acrylate unit having a bonding moiety of Formula 2 above, and / or an acrylate unit having a bonding moiety of Formula 1 above and a bonding moiety of Formula 2 above.

[0144] The acrylate unit means a state in which acrylate is contained in an acrylic polymer after polymerization or cross-linking.

[0145] In this case, the lower limit of the ratio of the acrylate units containing the bonding portion of Formula 1 above may be around 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, or 85% by weight, and the upper limit thereof may also be around 99%, 95%, 90%, 85%, 80%, 75%, 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, or 30% by weight, based on the total weight of the acrylate units included in the acrylic polymer. The content may be within a range of less than or equal to, or less than any of the above upper limits; or within a range of greater than or equal to, or greater than any of the above lower limits; or within a range of greater than or equal to, or greater than any of the above lower limits, and at the same time within a range of less than or equal to, or less than any of the above upper limits.

[0146] The lower limit of the ratio of the acrylate units containing the bonding portion of the above formula 2 based on the total weight of the acrylate units contained in the acrylic polymer may be about 5 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, or 35 wt%, and the upper limit thereof may be about 50 wt%, 45 wt%, 40 wt%, 35 wt%, 30 wt%, 25 wt%, 20 wt%, or 15 wt%. The content may be within a range of less than or equal to, or less than any of the above upper limits; or within a range of greater than or equal to, or greater than any of the above lower limits; or within a range of greater than or equal to, or greater than any of the above lower limits, and at the same time within a range of less than or equal to, or less than any of the above upper limits.

[0147] In the acrylic polymer, units other than the acrylate unit having a bonding portion of the above formula 1, the acrylate unit having a bonding portion of the above formula 2, and the acrylate unit having a bonding portion of the above formula 1 and a bonding portion of the above formula 2 are acrylate units not containing a bonding portion of the above formula 1 and a bonding portion of the above formula 2, or other monomer units other than acrylate.

[0148] In order to control tensile strength and / or recovery characteristics, acrylate can be a multifunctional monomer with difunctionality or higher functionality. Here, the situation that the monomer has difunctionality or higher functionality means that the number of (meth) acryloyl groups contained in the monomer is 2 or more, 3 or more, 4 or more, or 5 or more. The number of functional groups contained in the multifunctional monomer can also be 10 or less, 9 or less, 8 or less, 7 or less, 6 or less, 5 or less, 4 or less, or 3 or less. The number of functional groups can be adjusted between any one of the above-mentioned upper limits and any one of the above-mentioned lower limits. In an example, the number of (meth) acryloyl groups contained in the multifunctional monomer can be 2 or 3.

[0149] The lower limit of the ratio of the multifunctional acrylate unit based on the total weight of the acrylate units contained in the acrylic polymer 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 thereof 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 within a range of less than or equal to, or less than, any of the above upper limits; or within a range of greater than or equal to, or greater than, any of the above lower limits; or within a range of greater than or equal to, or greater than, any of the above lower limits, and within a range of less than or equal to, or less than, any of the above upper limits.

[0150] In addition to the multifunctional acrylate units, the acrylic polymer may also contain monofunctional acrylate units. Monofunctional acrylate means a monomer having one (meth)acryloyl group.

[0151] The lower limit of the weight ratio of the monofunctional acrylate units relative to 100 parts by weight of the multifunctional acrylate units can 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 can also 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 within a range of less than or equal to, or less than any of the above upper limits; or within a range of greater than or equal to, or greater than any of the above lower limits; or within a range of greater than or equal to, or greater than any of the above lower limits, and within a range of less than or equal to, or less than any of the above upper limits.

[0152] The monofunctional and / or multifunctional acrylate may contain a bonding moiety of Formula 1 and / or Formula 2 as described above.

[0153] The specific type of the multifunctional acrylate is not particularly limited. For example, applicable multifunctional acrylates can be exemplified by one, or two or more selected from the following: difunctional type, such as 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, hydroxypivalate neopentyl glycol di(meth)acrylate, dicyclopentyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphoric acid di(meth)acrylate, di(meth)acryloyloxyethyl isocyanurate, allyl cyclohexyl di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, dihydroxymethyl dicyclopentane di(meth)acrylate, ethylene oxide-modified hexahydrophthalic acid di(meth)acrylate, neopentyl glycol-modified trihydroxymethyl propane di(meth)acrylate, adamantane di(meth)acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene; trifunctional types 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 tri(meth)acryloyloxyethyl isocyanurate; tetrafunctional types such as diglycerol tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; pentafunctional types such as propionic acid-modified dipentaerythritol penta(meth)acrylate; and hexafunctional types such as dipentaerythritol hexa(meth)acrylate and caprolactone-modified dipentaerythritol hexa(meth)acrylate.

[0154] Examples of the monofunctional acrylate include, but are not limited to, alkyl (meth)acrylates, hydroxyalkyl (meth)acrylates, and glycidyl (meth)acrylates.

[0155] The multifunctional or monofunctional acrylate containing the bonding portion of Formula 1 and / or Formula 2 above can be exemplified by bisphenol diacrylates, such as modified bisphenol fluoride diacrylate, bisphenol A ethoxylated diacrylate, ortho-phenyl phenoxyl ethyl acrylate (OPPEA) and / or phenyl benzyl acrylate, but is not limited thereto.

[0156] The body may be formed using a curable material including the above materials using known means such as embossing, pressing, or injection molding.

[0157] The thickness of the body may typically be in the range of 50 μm to 500 μm.

[0158] In the groove formed in the body, there is a filling material, wherein the filling material includes a light absorbing material.

[0159] Various types of filler materials are known for use in constructing light management films, and known materials may also be used in this application.

[0160] Typically, the filling material includes a resin material that acts as a binder and a coloring material, pigment, dye, or the like that acts as a light absorbing material. Suitable light absorbing materials can be exemplified by black pigments or dyes such as carbon black, or those obtained by dyeing resin particles (e.g., transparent particles such as acrylic polymer particles) with black pigments such as carbon black. In addition to black pigments, a mixture of various blue, purple, yellow, and red pigments and / or dyes can be used, or a material that is substantially black by mixing and dispersing a black coloring material with a blue, purple, yellow, or red coloring material. Examples of blue pigments include copper phthalocyanine, etc.; examples of purple pigments include diphthalocyanine, etc. the yellow pigment can be exemplified by disazo yellow, etc.; and the red pigment can be exemplified by black horse phthal red tie pel, etc., but are not limited thereto, and dyes can be used in addition to the pigments.

[0161] The type of binder contained in the filling material is not particularly limited, and an appropriate type can be selected in consideration of the dispersibility of the light absorbing material, the desired refractive index relationship with the main body, etc. Generally, reactive oligomers (epoxy acrylate-based, urethane acrylate-based, polyether acrylate-based, polyester acrylate-based, polythiol-based, etc.) or reactive monomers (vinyl pyrrolidone, 2-ethylhexyl acrylate, β-hydroxy acrylate, tetrahydrofurfuryl acrylate, etc.) can be used, but applicable materials are not limited to the foregoing.

[0162] In addition to the above components, the light control film may further include additional components.

[0163] For example, the light management film may include a base film formed on one or both sides of a body.

[0164] Figure 7 Shown in Figure 1 The case where the base film 2000 is formed on one side of the main body 100 disclosed in Figure 7 In FIG, the base film 2000 exists only on one side of the body 100 , but the film 2000 may also exist on both sides of the body 100 .

[0165] The specific type of base film is not particularly limited. For example, as the base film, an anisotropic polymer film imparted with optical anisotropy by stretching, or an isotropic film without optical anisotropy, etc. can be used. The polymer film can be exemplified by, for example, a polyolefin film, such as a polyethylene film or a polypropylene film; a cycloolefin polymer (COP) film, such as a polynorbornene film; a polyvinyl chloride film; a polyacrylonitrile film; a polysulfone film; a polyacrylate film; a PVA (poly (vinylalcohol)) film; or a cellulose ester-based polymer film, such as a TAC (triacetylcellulose) film; a polyester film; or a polycarbonate film; or a copolymer film of two or more monomers of the monomers forming the polymer; and the like.

[0166] By applying an anisotropic polymer film having a large in-plane phase difference as a base film, a light control film that prevents appearance defects can be effectively provided.

[0167] In one example, the lower limit of the in-plane phase difference (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 thereof may also 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 phase difference may be in a range less than or equal to, or less than any one of the above upper limits; or in a range greater than or equal to, or greater than any one of the above lower limits; or in a range greater than or equal to, or greater than any one of the above lower limits, and at the same time in a range less than or equal to, or less than any one of the above upper limits. By applying a base film having such an in-plane phase difference, even when the light control film is exposed to polarized light or the like, the occurrence of rainbow patterns or other color spots can be suppressed.

[0168] The in-plane phase difference is a physical quantity according to the following formula 4.

[0169] [Formula 4]

[0170] Rin=d×(nx-ny)

[0171] In Formula 4, Rin is the in-plane phase difference, 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 thickness of the film. Here, the meanings of the slow axis and the fast axis are known in the industry.

[0172] The type of base film is not particularly limited.

[0173] For example, a representative example of a film showing such an in-plane phase difference known in the industry is a stretched polyester film such as a stretched PET (poly(ethyleneterephthalate)) film.

[0174] Therefore, the base film may be a polyester film, but is not limited thereto.

[0175] As described above, if the groove formed in the body is formed to show a straight line shape when the first surface is viewed in the normal direction of the first surface of the body, the lower limit of the angle formed by the slow axis of the base film and the straight line shape may be around 80 degrees, 85 degrees, or 90 degrees, and the upper limit thereof may be around 90 degrees or 85 degrees. The angle may be within a range of less than or equal to, or less than any of the above upper limits; or within a range of greater than or equal to, or greater than any of the above lower limits; or within a range of greater than or equal to, or greater than any of the above lower limits, while within a range of less than or equal to, or less than any of the above upper limits.

[0176] In another example, as described above, if the groove formed in the body is formed to show a straight line shape when the first surface is viewed in the normal direction of the first surface of the body, the lower limit of the angle formed by the slow axis of the base film and the straight line shape may be around 0 degrees, 2 degrees, 4 degrees, 6 degrees, 8 degrees, or 10 degrees, and the upper limit thereof may be around 10 degrees, 8 degrees, 6 degrees, 4 degrees, or 2 degrees. The angle may be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0177] The thickness of the base film may generally be in the range of 5 μm to 500 μm, but is not limited thereto.

[0178] In one example, the light control film may include a pressure sensitive adhesive layer or adhesive layer formed on one or both sides of the body. The pressure sensitive adhesive layer or adhesive layer is applied to attach the light control film to a display device or the like. Figure 8 FIG. 3 shows a case where a pressure-sensitive adhesive layer 3000 is formed on one side of the body 100. Figure 8 In the case of , the pressure-sensitive adhesive layer is formed on the first surface of the body 100, and in this case, the first surface generally becomes the light input surface. The pressure-sensitive adhesive layer may also be formed on the second surface of the body.

[0179] The type of the pressure-sensitive adhesive layer or adhesive layer is not particularly limited. For example, an acrylic or silicone-based adhesive known in the industry as an OCA (Optical Clear Adhesive) can be used.

[0180] The thickness of the adhesive layer or adhesive layers is generally in the range of 1 μm to 100 μm, but is not limited thereto.

[0181] In the light control film, in addition to the above constitutions, any other desired constitutions may also be present.

[0182] This specification discloses devices, such as display devices, that utilize light management films.

[0183] There is no particular limitation on the type of display device to which the light control film can be applied. For example, the light control film can be applied to LCD (liquid crystal display), OLED (organic light emitting diode) display or PDP (Plasma Display Panel).

[0184] In various display devices, in the absence of any element (such as a backlight, a diffuser film, or a prism film) that can compensate for defects that may occur due to the light control film, even if the light control film is applied to a device such as an OLED (organic light emitting diode) display, in which the light control film is arranged relatively close to an observer, a light control film can be provided that does not produce defects such as stripes that can be recognized by the observer while exerting the desired performance.

[0185] Thus, this specification discloses an OLED (organic light emitting diode) display (organic light emitting device) applying a light management film.

[0186] A display may generally include an organic light emitting panel and a light management film disposed on a viewing side of the organic light emitting panel.

[0187] A polarizing layer is usually provided on the viewing side of an OLED (Organic Light Emitting Diode) display for anti-reflection purposes, etc.

[0188] Therefore, an OLED (Organic Light Emitting Diode) display may also include a polarizing layer on the viewing side.

[0189] In this case, the light control film may be disposed between the polarizing layer and the organic light emitting panel, or on a side surface of the polarizing layer opposite to a surface facing the organic light emitting panel.

[0190] Here, for example, Figure 2As shown, if the groove is formed to show a straight line shape when the first surface is observed in the normal direction of the first surface of the main body of the light control film, the lower limit of the angle formed by the straight line shape of the groove and the light absorption axis of the polarizing layer can 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 thereof can 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 less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0191] When the light control film is set according to the type of OLED (organic light emitting diode) display as described above, the distance between the polarizing layer and the light control film can be varied, wherein in order to prevent defects such as ghosting or moiré fringes, the refractive index relationship between the main body of the light control film and the filling material can be controlled according to the distance.

[0192] For example, the properties of the light control film may be adjusted according to the distance between the polarizing layer and the first surface to ensure desired properties.

[0193] For example, a case where the distance between the polarizing layer and the first surface is 250 μm or less is referred to as a first aspect, and a case where the distance is greater than 250 μm is referred to as a second aspect, and thus the characteristics are described as follows.

[0194] In the first aspect, the upper limit of the distance between the polarizing layer and the first surface may be approximately 240 μm, 230 μm, 220 μm, 210 μm, 200 μm, or 195 μm, and the lower limit thereof may be approximately 50 μm, 100 μm, 150 μm, or 185 μm. The distance may be within a range less than, equal to, or less than any of the above upper limits; or within a range greater than, equal to, or greater than any of the above lower limits, and within a range less than, equal to, or less than any of the above upper limits.

[0195] In the case of the first aspect, the refractive index N1 of the main body and the refractive index N2 of the filling material may satisfy the relationship of N1>N2.

[0196] In this case, the lower limit of the difference N1-N2 between the refractive indices N1 and N2 may be approximately 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 thereof may be approximately 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 within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and within a range less than or equal to, or less than any of the above upper limits.

[0197] In this case, the first surface of the main body of the light control film may be disposed closer to the polarizing layer than the second surface, or the second surface may be disposed closer to the polarizing layer than the first surface.

[0198] In the first aspect, the lower limit of the aperture ratio (aperture ratio of the transmission area) on the first surface of the main body of the light control film can be about 60%, 65%, 70%, 75% or 80%. The upper limit of the aperture ratio (aperture ratio of the transmission area) on the first surface can be about 100%, 95%, 90%, 85%, 80%, 75%, 70% or 65%. The aperture ratio can be within a range of less than or equal to, or less than any of the above upper limits; or within a range of greater than or equal to, or greater than any of the above lower limits; or within a range of greater than or equal to, or greater than any of the above lower limits, and at the same time within a range of less than or equal to, or less than any of the above upper limits. The meaning of the aperture ratio on the first surface is as described above.

[0199] In this case, the ratio (O2 / O1) of the aperture ratio (O1) on the first surface of the light control film to the aperture ratio (O2) on the second surface can be within a predetermined range. For example, the lower limit of the ratio (O2 / O1) can be about 1, 1.01, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, or 1.4, and the upper limit thereof can be about 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 can be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0200] Figure 11FIG. 1 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, and a light control film 4, wherein the distance between the polarizing layer 3 and the first surface of the main body of the light control film 4 is mainly determined by the pressure-sensitive adhesive layer or adhesive layer 3000 to which the light control film 4 is attached.

[0201] In the second aspect, 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 thereof may be approximately 1000 μm, 900 μm, 800 μm, 700 μm, 600 μm, 500 μm, or 400 μm. The distance may be within a range greater than, equal to, or greater than any of the above lower limits; or within a range greater than, equal to, or greater than any of the above lower limits, and within a range less than, equal to, or less than any of the above upper limits.

[0202] In the case of the second aspect, the refractive index N1 of the main body and the refractive index N2 of the filling material may satisfy the relationship of N1>N2.

[0203] 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 thereof 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 less than or equal to, or less than any of the above upper limits; or in a range greater than or equal to, or greater than any of the above lower limits; or in a range greater than or equal to, or greater than any of the above lower limits, and at the same time in a range less than or equal to, or less than any of the above upper limits.

[0204] In such a case, the first surface of the main body of the light control film may be disposed closer to the polarizing layer than the second surface, or the second surface may be disposed closer to the polarizing layer than the first surface.

[0205] In the second aspect, the lower limit of the aperture ratio (aperture ratio of the transmission area) on the first surface of the main body of the light control film can be about 60%, 65%, 70%, 75% or 80%. The upper limit of the aperture ratio (aperture ratio of the transmission area) on the first surface can be about 100%, 95%, 90%, 85%, 80%, 75%, 70% or 65%. The aperture ratio can also be within a range of less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits. The meaning of the aperture ratio on the first surface is as described above.

[0206] In this case, the ratio (O2 / O1) of the aperture ratio (O1) on the first surface of the light control film to the aperture ratio (O2) on the second surface can be within a predetermined range. For example, the lower limit of the ratio (O2 / O1) can be about 1, 1.01, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, or 1.4, and the upper limit thereof can be about 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 can also be within a range less than or equal to, or less than any of the above upper limits; or within a range greater than or equal to, or greater than any of the above lower limits; or within a range greater than or equal to, or greater than any of the above lower limits, and at the same time within a range less than or equal to, or less than any of the above upper limits.

[0207] Figure 12 FIG. 1 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 a light control film 4. The distance between the polarizing layer 3 and the first surface of the main body of the light control film 4 is mainly determined by the pressure-sensitive adhesive layer or adhesive layer 3000 to which the light control film 4 is attached, and the transparent substrate 5.

[0208] When a light control film is applied to an OLED display, by controlling the relationship of the refractive index as described above according to the distance from the polarizing layer, the light emission angle can be precisely controlled, and high transmittance, high brightness, and excellent resolution can be ensured within the light emission angle while preventing defects such as ghosting or moiré fringes and appearance defects that may be caused by the light control film.

[0209] Beneficial effects

[0210] This specification discloses a light control film and a display device using the same. When applied to a display device, the light control film enables precise control of the light emission angle, ensuring high transmittance, high brightness, and excellent resolution within the light emission angle, while blocking unnecessary light that can cause defects such as so-called ghosting or moiré fringes. Even when applied to an OLED display, the light control film exhibits the above properties while preventing defects such as fringes that are visible to an observer. This specification also discloses a display device using the light control film. BRIEF DESCRIPTION OF THE DRAWINGS

[0211] Figure 1 is a cross-sectional view of a body of an exemplary light management film of the present application.

[0212] Figure 2 This is a diagram when the main body is viewed in the normal direction of the first surface of the main body.

[0213] Figure 3 This is a diagram showing a form in which the groove of the main body is filled with a filling material.

[0214] Figure 4 2 is a diagram for explaining the first side and the second side of the groove.

[0215] Figure 5 A diagram for explaining side A and side B of a groove.

[0216] Figure 6 A diagram for explaining the specific shape of the terminal portion.

[0217] Figure 7 FIG. 4 is a diagram of a light management film further comprising a base film.

[0218] Figure 8 is a diagram of a light management film further comprising a pressure sensitive adhesive layer or adhesive layer.

[0219] Figure 9 SEM image of the cross section of the light control film.

[0220] Figure 10 Shown are the results of evaluating the brightness of the light management films at various viewing angles.

[0221] Figure 11 and Figure 12 A diagram illustrating an OLED display to which a light management film is applied. DETAILED DESCRIPTION

[0222] Hereinafter, the light control film and the like will be described in more detail through examples and comparative examples, but the scope of the light control film and the like is not limited to the following examples.

[0223] Preparation Example 1. Preparation of light control film body

[0224] A material (host material) for forming a main body of a light control film was prepared in a solvent-free form by mixing modified bisphenol fluoride diacrylate (A) (Miwon Specialty Chemical, Miramer HR6100), TMPTA (trimethylolpropane triacrylate) (B), bisphenol A glycol diacrylate (C) (Cas No. 64401-02-1), OPPEA (o-phenylphenoxyethyl acrylate) (D), and PBA (phenylbenzyl acrylate) (E) as a curable compound. The mixing ratio of the above materials was set to a weight ratio of approximately 10:6:23:13:13 (A:B:C:D:E). The host material was prepared by adding an initiator (Darocur 1173, Ciba Specialty Chemicals) to the above materials at a ratio of approximately 1 part by weight relative to 100 parts by weight of the total components A to E.

[0225] The main body of the light control film is manufactured using the main body material. The main body is manufactured in the manner disclosed in the document WO2021 / 145469A1.

[0226] The main body of the light control film is manufactured by: Figure 1 The film supply device 10 disclosed in the disclosure unfolds the base film 210 and supplies the base film 210 at the same time, supplies material to the coating device 20 to form a resin layer 220' on the base film 210, and irradiates the resin layer 220' imprinted by the pattern forming mold 30 with light through the curing device 40 to cure it, and recovers it to the collecting device 50.

[0227] A groove having a desired shape is formed by controlling the mold shape of the pattern forming mold 30 .

[0228] Light irradiation was performed using a high-pressure metal halide lamp, and the irradiation wavelength range was within the range of 200 nm to 600 nm.

[0229] In the above process, SKC's OCF (Opticalaxis Control Film) (thickness: 125 μm) was used as the base film 210. When measured in the following manner, the in-plane phase difference of the base film was at a level of approximately 11,000 nm to 14,000 nm.

[0230] The main body of the light control film formed according to the above Preparation Example 1 includes a base film and a main body formed on one side of the film, wherein the portion of the main body in contact with the base film becomes the second surface ( Figure 1 1002 in ).

[0231] Preparation Example 2. Preparation of a filling material containing a light absorbing material

[0232] The filler material was prepared by blending carbon black, 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 (sole carbon black and powder obtained by converting carbon black into acrylic beads) (G). The mixing ratio of these materials was set to a weight ratio (F:G) of approximately 67:20.

[0233] 1. Measurement of refractive index

[0234] Refractive index of the main body (transmission area)

[0235] Two demolded glass plates were separated by a gap spacer, approximately 100 μm apart. The host material obtained in Preparation Example 1 was injected between the two glass plates and then cured. Curing was performed by light irradiation in the same manner as in Preparation Example 1. The refractive index of the cured material was measured using an ABBE refractometer (nD BrixDR-M4) at a reference wavelength of approximately 589 nm.

[0236] Refractive index of the absorption region

[0237] In the case of a filler material forming an absorption region, the inclusion of carbon black as a light-absorbing material makes it difficult to directly measure the refractive index. In this case, the refractive index of the final filler material can be determined by measuring the refractive index of a material having the same composition as the filler material, excluding carbon black, in the same manner as 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 the relevant carbon black increases by approximately 0.009 for every approximately 1% increase in the amount of carbon black in the filler material, so the refractive index of the absorption region can be calculated based on this. 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.

[0238] 2. Measurement of tensile strength

[0239] About tensile strength, for the sample with the horizontal length of about 45mm, the vertical length of about 12.5mm and the thickness of about 2mm, the tensile strength is measured at room temperature (about 25 ℃) using UTM (Universal Testing Machine) equipment. For example, the sample can be manufactured by curing the main material described in Preparation Example 1 to the size, wherein the curing conditions are the same as in Preparation Example 1. The two ends of the sample in the transverse direction are fixed to the device for about 8mm, and the strength when the sample breaks is measured while stretching the sample in the transverse direction at a speed of about 50mm / second, wherein the strength is referred to as tensile strength. As a result of measuring in this way, the tensile strength of the main material is about 13MPa.

[0240] 3. Assessment of elastic recovery

[0241] The elastic recovery force of the specimen used in the tensile strength measurement was evaluated using a pencil hardness tester. The specimen was loaded into the pencil hardness tester, and a load of approximately 300g was applied to the specimen using a 2H hardness pencil. The pencil was then advanced in one direction at a speed of 20mm / second to create a mark. The pencil was then removed and the mark was determined to see if it disappeared. The measurement of the specimen revealed that the mark created by the 2H hardness pencil disappeared within 10 seconds. The measurement was performed at room temperature (approximately 25°C).

[0242] 4. Evaluation of the in-plane phase difference of the base film

[0243] The in-plane phase difference (Rin) of the base film was measured using Agilent's UV / VIS spectrometer 8453 device for light with a wavelength of 550nm. Two polarizers were mounted on the UV / VIS spectrometer so that their transmission axes were orthogonal to each other, and the base film was mounted between the two polarizers so that its slow axis formed 45 degrees with the transmission axes of the two polarizers, and then the transmittance according to the wavelength was measured. The phase delay order of each peak was obtained by the transmittance diagram according to the wavelength. Specifically, in the transmittance diagram according to the wavelength, the waveform satisfies the following formula A, and in the sinusoidal waveform, the maximum peak (Tmax) condition satisfies the following formula B. In the case of λmax in formula A, T in formula A and T in formula B are the same, so that the formula is expanded. If the formula is also expanded for n+1, n+2, and n+3, and R is eliminated by arranging the n and n+1 formulas, n is arranged into λn and λn+1 formulas, then the following formula C is obtained. Since T in Formula A and Formula B are identical, n and λ can be determined. Therefore, R is obtained for each of λn, λn+1, λn+2, and λn+3. A linear trendline of the R value according to wavelength is obtained for each of the four points, and the R value for 550 nm is calculated. The linear trendline function is Y = ax + b, where a and b are constants. Substituting 550 nm for x in the above function yields the Y value, which is the Rin value for light with a wavelength of 550 nm.

[0244] [Formula A]

[0245] T=sin 2 [(2πR / λ)]

[0246] [Formula B]

[0247] T=sin 2 [((2n+1)π / 2)]

[0248] [Formula C]

[0249] n=(λn-3λn+1) / (2λn+1+1-2λn)

[0250] Here, R means the in-plane phase difference (Rin), λ means the wavelength, and n means the peak order of the sine waveform.

[0251] Example 1.

[0252] The main body of the light control film was manufactured according to the method described in Preparation Example 1. The shape of the manufactured main body will be described with reference to the accompanying drawings. Figure 1 As shown, the main body is manufactured so that it has a first surface 1001 and a second surface 1002, and includes a plurality of grooves 1003 extending from the first surface 1001 to the second surface 1002 (in Figure 1In the embodiment, a base film is present on the second surface 1002 of the body).

[0253] like Figure 2 As shown, the grooves 1003 are formed so that when the body is viewed toward the first surface 1001, the grooves 1003 form a straight line on the first surface 1001. At this time, the straight line shape is formed at an angle of about 90 degrees with the slow axis of the base film.

[0254] In the above structure, the spacing of the grooves 1003 ( Figure 1 The width of the groove 1003 on the first surface 1001 ( Figure 1 The width of the groove 1003 at one end facing the second surface 1002 ( Figure 1 W2 in the figure corresponds to the following Figure 4 The length of the opposite side 10) is formed to be about 6 μm; the depth of the groove ( Figure 1 H in T ) is formed to about 90 μm; and Figure 1 The L in the image is formed to be approximately 20 μm to 35 μm.

[0255] In the main body, the area of the absorption region of the first surface 1001 ( Figure 1 The ratio of the total area of the absorption region having width W1 in the first surface 1001 to the total area is about 30%. Therefore, the opening ratio on the first surface 1001 is about 70%. In addition, in the main body, the area of the absorption region of the second surface 1002 ( Figure 1 The ratio of the total area of the absorption region having a width W2 in the second surface 1002 to the total area is about 15%. Therefore, the opening ratio of the second surface 1002 is about 85%.

[0256] In the subject Figure 4 , the angles corresponding to the angles θ1 and θ2 are set to approximately 2.5 degrees.

[0257] The grooves 1003 in the main body of the light control film and the first surface 1001 between the grooves 1003 are formed to have Figure 6 The shape shown in Figure 6 , the angle θ21 is set to about 87.5 degrees, and the angle θ11 is set to about 3 degrees. Figure 6 The length of the opposite side 10 is about 6 μm, and the length of the inclined side 20 is about 11 μm.

[0258] A light control film is manufactured by filling the groove 1003 of the main body with the filling material prepared in Preparation Example 2 and curing it. The filling material is prepared in the same manner as in Preparation Example 2, but it is prepared so that the refractive index of the relevant filling material (absorption region) is about 1.48 by adjusting the amount of carbon black. Since the refractive index of the main body (transmission region) is about 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 is about 0.03 to 0.06. The filling of the filling material is carried out by a scraping process. That is, the filling is carried out by applying the filling material to the surface of the main body where the groove is formed, compressing the applied filling material with a knife to introduce the filling material into the groove, and then removing the material except the material filled in the groove. Taking into account the composition of the filling material, its curing is carried out by irradiating the filling material with light (ultraviolet rays).

[0259] Example 2.

[0260] The main body of the light control film was formed in the same manner as in Example 1.

[0261] However, in this case, Figure 5 The multi-level structure shown forms the shape of a groove. Figure 5 In the example, the angle θA is set to about 3, and the angle θB is set to about 1.5. Figure 5 In the embodiment, the length of the first side 10031A is set to about 120 μm, and the length of the second side 10031B is set to about 30 μm.

[0262] In the case of this main body, the opening ratio on the first surface 1001 is about 75.4%, the opening ratio on the second surface 1002 is about 91%, and the spacing of the grooves (corresponding to Figure 1 The value of P) is about 61 μm, and the width of the bottom end of the groove (corresponding to Figure 1 The value of W1 in the figure is about 15 μm, and the width of the upper end of the groove (corresponding to Figure 1 The value of W2 in the figure is about 5.47 μm.

[0263] In addition, the depth of the groove of the main body (corresponding to Figure 1 H in T In addition to the above, the angle formed by the linear shape of the groove and the slow axis of the base film and Figure 1 The L in the embodiment is the same as that in Example 1.

[0264] The filling of the filling material into the groove 1003 of the main body is controlled in the same manner as in Example 1.

[0265] Comparative Example 1.

[0266] A light control film was manufactured in the same manner as in Example 1, except that a transparent resin material commonly used in the production of light control films was used as the material for forming the body instead of the material in Preparation Example 1. As a result of evaluating the tensile strength of the material in the above-described manner, it was approximately 5 MPa, and when evaluating the elastic restoring force, the mark did not disappear after the pencil was removed.

[0267] Test Example 1. Fill rate and appearance evaluation

[0268] The filling properties of the filler materials in the light control films of Example 1 and Comparative Example 1 were evaluated using SEM images. The filling properties were evaluated by photographing cross sections of the light control films using a scanning electron microscope (SEM) (JEOL, JSM-7800F). The light control films were pretreated using a TXP pretreatment device and then photographed using the SEM. Images were taken using the BED-C observation mode, with the magnification, working distance, and acceleration voltage set to 100x, 15 mm (working distance), and 15.0 kV, respectively. Figure 9 : These are images captured in the same manner as above for Example 1.

[0269] For the light control films of Example 1 and Comparative Example 1, the depth of the area not filled with the filling material of all the grooves was determined based on the SEM images. Figure 3 As shown, by measuring the shortest distance ( Figure 3 The depth of the area not filled with the filling material 200 is evaluated by measuring D1, D2, etc. in FIG. 1 , wherein the first surface serving as a standard for the depth is a virtual surface or line ( D1, D2, etc. in FIG. 1 ) connecting the first surfaces 1001 existing on both sides of the portion forming the groove 1003. Figure 3 In addition, in the case where there are two or more shortest distances, the shortest distance in the average depth of the region not filled with the filling material is calculated as the longest distance of the two or more shortest distances ( Figure 3 D2 in the case of .

[0270] The depths of the unfilled areas of the respective grooves measured in the same manner as above are summarized in Table 1 below.

[0271] [Table 1]

[0272]

[0273] It can be seen from the results in Table 1 that, compared with Comparative Example 1, Example 1 has a smaller average depth of the unfilled region and a smaller standard deviation of the depth.

[0274] The light control films of Example 1 and Comparative Example 1 were evaluated for the presence of cosmetic defects. The light control films were observed at a viewing angle of up to 20 degrees, based on the normal direction of their surfaces, to determine whether hairline defects, which are small shadow defects, were observed within the viewing angle. The presence of cosmetic defects was evaluated based on whether shadow defects were observed. In Comparative Example 1, many hairline defects were observed within the viewing angle, but in Example 1, no hairline defects were observed across the entire viewing angle. The same evaluation results for Example 2 revealed that the average depth of the unfilled areas was approximately 2.25 μm, with a standard deviation of approximately 0.18 μm. Even in this case, no cosmetic defects were observed.

[0275] Test Example 2. Brightness Measurement Based on Viewing Angle

[0276] For the light control film of Example 1, the refractive index N2 of the absorption region was fixed at 1.48, and the refractive index N1 of the transmission region was changed, thereby evaluating the brightness according to the viewing angle, and the results are shown below. Figure 10 middle.

[0277] Here, the method of changing the refractive index N1 of the transmission region can be performed by changing the composition of the material used for the main body. Generally, as the number of aromatic groups increases, the refractive index increases, so the refractive index can be adjusted by changing the ratio of modified bisphenol fluoride diacrylate (A), bisphenol A glycol diacrylate (C), OPPEA (o-phenylphenoxyethyl acrylate) (D) and / or PBA (phenyl benzyl acrylate) (E) in the main body material.

[0278] exist Figure 10 In the example, N-1 to N-6 are cases where the differences (N1-N2) between the refractive index N1 of the transmission region and the refractive index N2 of the absorption region are 1.48, 1.49, 1.50, 1.51, 1.52, and 1.53, respectively, and Figure 10 In the image, the X-axis is the viewing angle, and the Y-axis is the brightness. Figure 10 The results show that the light transmittance can be controlled according to the viewing angle through the light control film of the present application.

[0279] Example 3.

[0280] A light control film was manufactured in the same manner as in Example 1, and a pressure-sensitive adhesive layer was formed on the first surface of the light control film, which was then attached to an OLED to produce a Figure 11 Here, acrylic OCA (Optically Clear Adhesive) generally used for optical purposes is used as the pressure-sensitive adhesive layer.

[0281] When applied to Figure 11When the structure is formed, the refractive index of the main body of the light control film is set to about 1.511 to 1.541, and the refractive index of the filling material is adjusted by the amount of carbon black, thereby setting the difference (N1-N2) between the refractive index N1 of the transmission area and the refractive index N2 of the absorption area to about 0.03 to 0.06.

[0282] In addition, Figure 11 In the structure, the lower surface of the light control film ( Figure 11 The opening ratio on the surface in contact with the OCA is set to about 70% to 74%, and the opening ratio on the upper surface (the surface opposite to the lower surface) is set to about 85% to 90%.

[0283] Since the thickness of the OCA in the above structure is about 190 μm, the distance between the first surface of the main body of the light control film and the polarizing layer is about 190 μm. In the above structure, the absorption axis of the polarizing layer (pol) is aligned with the straight line shape formed by the groove of the light control film (see Figure 2 ) is set to about 7 degrees to 8 degrees.

[0284] For the OLED having the above structure, appearance defects were evaluated according to the method of Test Example 1, and luminance according to viewing angle was evaluated according to Test Example 2. It was confirmed that no appearance defects were observed, and transmittance control characteristics according to viewing angles were ensured. In addition, no defects such as ghosting were confirmed.

[0285] Example 4.

[0286] A light control film was manufactured in the same manner as in Example 1, and a pressure-sensitive adhesive layer was formed on the first surface of the light control film, which was then attached to the OLED to produce a light control film having the same Figure 12 The OLED panel has the same structure. An acrylic OCA (Optically Clear Adhesive) commonly used for optical purposes is used as the pressure-sensitive adhesive layer.

[0287] When applied to Figure 12 When the structure is formed, the refractive index N1 of the main body of the light control film is set to about 1.501 to 1.531, and the refractive index of the filling material is adjusted by the amount of carbon black, thereby setting the difference (N1-N2) between the refractive index N1 of the transmission area and the refractive index N2 of the absorption area to about 0.02 to 0.05.

[0288] In addition, in the following structure, the lower surface of the light control film ( Figure 12 The opening ratio on the surface in contact with the OCA is set to about 68% to 72%, and the opening ratio on the upper surface (the surface opposite to the lower surface) is set to about 87% to 91%.

[0289] because Figure 12 The thickness of the OCA in the structure is about 25 μm, and the thickness of the glass substrate is about 300 μm, so the distance between the first surface of the main body of the light control film and the polarizing layer is about 325 μm.

[0290] In the above structure, the absorption axis of the polarizing layer (pol) is aligned with the straight line shape formed by the grooves of the light control film (see Figure 2 ) is set to about 4 degrees to 6 degrees.

[0291] For the OLED having the above structure, appearance defects were evaluated according to the method of Test Example 1, and luminance according to viewing angle was evaluated according to Test Example 2. It was confirmed that no appearance defects were observed, and transmittance control characteristics according to viewing angles were ensured. In addition, no defects such as ghosting were confirmed.

Claims

1. A light control film comprising: a main body having a first surface and a second surface facing the first surface, wherein a plurality of grooves are formed on the first surface and extend toward the second surface; a filling material that fills the groove and contains a light absorbing material; as well as A base film is present on one or both sides of the main body, wherein The base film has an in-plane retardation of 8,000 nm or more with respect to a wavelength of 550 nm.

2. The light control film according to claim 1, wherein the groove formed in the main body is formed to show a straight line shape when the first surface is observed in the normal direction of the first surface of the main body, and the slow axis of the base film and the straight line shape are set to form an angle in the range of 80 degrees to 90 degrees or 0 degrees to 10 degrees.

3. The light control film of claim 1 , wherein in the plurality of grooves filled with the filling material, an average depth of areas not filled with the filling material is in the range of 0 μm to 3 μm, and a standard deviation of the depth of the unfilled areas is 0.2 or less. 4 . The light control film of claim 1 , wherein an absolute value of a difference between a refractive index N1 of the main body and a refractive index N2 of the filler material is in a range of 0 to 0.

1.

5. The light control film of claim 1 , wherein 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 facing the first side and extending from the first surface toward the second surface, and A first angle formed by the first side and a normal direction of the first surface, and a second angle formed by the second side and a normal direction of the second surface are each within a range of 0 degrees to 10 degrees. 6 . The light management film of claim 5 , wherein the first angle and the second angle are different from each other, wherein the first angle is 2 degrees or greater, and the second angle is 2 degrees or less.

7. The light control film of claim 1 , wherein 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 facing the first side and extending from the first surface toward the second surface, and The first side or the second side includes a side A forming an angle A with a normal direction of the first surface, and a side B forming an angle B different from the angle A.

8. The light management film of claim 7, wherein the side B is positioned closer to the second surface of the body relative to the side A, and The angle A is 3 degrees or greater, and the angle B is 2 degrees or less.

9. The light control film of claim 7, wherein R of 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, L A is the length of side A, L B is the length of the side B, θ A is the angle A, and θ B is the angle B.

10. The light control film of claim 1, wherein the depth of the grooves formed in the body is in the range of 50 μm to 200 μm, The plurality of grooves formed in the body have a pitch ranging from 10 μm to 100 μm or less, and A 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 management film of claim 1, wherein the body has a tensile strength of 7 MPa or greater.

12. The light control film of claim 1, wherein the body comprises an acrylic polymer containing one or more bonding moieties selected from the group consisting of a bonding moiety of the following Formula 1 and a bonding moiety of the following Formula 2: [Formula 1] in, R1 is a single bond, an alkylene group or an alkylidene group, [Formula 2] wherein R2 is an alkylene group or an alkylidene group, and n is a number in the range of 1 to 50. 13 . The light control film according to claim 12 , wherein the acrylic polymer comprises an acrylate unit having one or more bonding moieties selected from the bonding moiety of Formula 1 and the bonding moiety of Formula 2. The light control film according to claim 13 , wherein a ratio of the acrylate unit containing the bonding portion of Formula 1 is in the range of 20 wt % to 90 wt % based on the total weight of the acrylate units included in the acrylic polymer. 15 . The light control film according to claim 13 , wherein a ratio of the acrylate unit containing the bonding portion of Formula 2 is in the range of 5 wt % to 40 wt % based on the total weight of the acrylate units included in the acrylic polymer. 16 . The light control film according to claim 13 , wherein a ratio of the multifunctional acrylate unit is in the range of 5 wt % to 80 wt % based on the total weight of the acrylate units included in the acrylic polymer.

17. An organic light-emitting device, comprising: Organic light-emitting panels; and The light management film of claim 1 is disposed on the viewing side of the organic light emitting panel.

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

19. The organic light-emitting device according to claim 18, wherein the first surface of the main body of the light-controlling film is disposed closer to the polarizing layer than the second surface, The distance between the polarizing layer and the first surface is 250 μm or less, and A difference N1-N2 between a refractive index N1 of the main body and a refractive index N2 of the filling material is in a range of 0.03 to 0.

06.

20. The organic light-emitting device according to claim 18, wherein the first surface of the main body of the light-controlling film is disposed closer to the polarizing layer than the second surface, The distance between the polarizing layer and the first surface is greater than 250 μm, and A difference N1-N2 between a refractive index N1 of the main body and a refractive index N2 of the filling material is in a range of 0.02 to 0.05.

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