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. 10-2022-0180439, 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, etc. Background Art

[0003] A light control film is also referred to as a light collimation film. The light control film is configured to be able to control the light transmittance and control the light emission direction in a display device, etc.

[0004] As display devices, LCDs (Liquid Crystal Displays) or OLEDs (Organic Light Emitting Diodes), etc. are known. Such display devices are generally designed to ensure a wide viewing angle. However, for example, when viewing a display device in a public place, it may be necessary to prevent the screen of the display device from being exposed to people around. In addition, in the case of a vehicle display, considering the influence on the driver and the convenience of passengers, etc., it is necessary to adjust the width of the viewing angle and / or the light emission direction of the display according to the position of the display.

[0005] In such applications, the light control film can be used to control the light emission direction or angle and control the 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] For these light control films, it is necessary to precisely control the light emission angle, within which a high transmittance, high brightness, and excellent resolution are ensured, and unnecessary light that causes defects such as so-called ghost or moire is blocked.

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

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

[0010] In the case of an LCD, the light control film is disposed between the liquid crystal panel and the backlight. In this way, in an LCD, the light control film is disposed relatively inside the screen on which an image is projected and is disposed adjacent to the backlight that generates strong light. In addition, in addition to the light control film, a diffusion film or a prism film, etc. also exist 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, and the side on which the polarizing layer is present becomes the side on which the display screen is located.

[0013] When a light control film is applied to an OLED display, it is generally 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 an OLED display, the light control film is positioned relatively close to the observer. Further, in the case of an OLED, it is a self-luminous element, and there is no element that emits strong light (such as a backlight of an LCD). Therefore, when a light control film is applied to an OLED display, an observer can easily recognize defects such as unnecessary stripes caused by the light control film.

[0015] [Prior Art Documents]

[0016] [Patent Documents]

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

[0018] Technical Problem

[0019] This specification discloses a light control film and a display device to which the light control film is applied. This specification aims to disclose such a light control film that can control the light emission angle, ensure high transmittance, high brightness, and excellent resolution within the light emission angle, and does not cause defects such as so-called ghosting or moiré fringes in the display device.

[0020] This specification aims to disclose the following: Even when a light control film is applied to an OLED display, the light control film exhibits the above performances while preventing the appearance of defects such as stripes that can be recognized by an observer.

[0021] This specification discloses a display device to which the light control film is applied.

[0022] Technical Solution

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

[0024] The term room temperature refers to the natural temperature without heating or cooling, which can mean any temperature in the range of, for example, 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] Among the terms used in this specification to define angles, the terms vertical, parallel, orthogonal, and horizontal, as well as the numerical values of any specific angles, should be interpreted considering manufacturing errors, etc. Therefore, the said terms and numerical values of angles mean substantially vertical, substantially parallel, substantially orthogonal, or substantially horizontal, and the numerical values of angles within the range that does not impair the intended effect. The vertical, parallel, orthogonal, or horizontal, as well as the range of numerical values, include errors such as manufacturing errors or variations. For example, the corresponding cases can include errors within about ±3 degrees, within about ±2 degrees, within about ±1 degree, within about ±0.8 degree, within about ±0.6 degree, or within about ±0.4 degree.

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

[0028] Unless otherwise specified herein, the unit of angle is degree.

[0029] Unless otherwise specified herein, the reference wavelength of the refractive index is about 589 nm.

[0030] This specification discloses a light control film.

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

[0032] Figure 1 FIG. is an exemplary cross-sectional view of the light control film 100 including the main body and the filling material 200.

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

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

[0035] The filling material 200 is present inside such grooves 1003, and the filling material contains a light absorption material. In such a structure, the main body and the filling material 200 filled in the grooves 1003 can form a transmission region and an absorption region, and the transmission region and the absorption region are alternately repeated along the direction in which the first surface 1001 or the second surface 1002 is formed in the cross-section.

[0036] For example, the regions where the filling material 200 is not present in the first surface and the second surface of the light control film or in the main body can form a transmission region, while the regions where the filling material 200 is present can form an absorption region.

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

[0038] In one example, as Figure 2 shown, when observing the first surface 1001 of the main body in the light control film 100 in the normal direction of the first surface 1001, the grooves 1003 can be formed to show a linear 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 main body having grooves with a filling material containing a light absorption material, but if the grooves have been filled with the filling material to a level higher than a certain level, no attention has been paid to the specific filling rate, and almost no consideration has been given to the uniformity of the filling material filled in each of the plurality of grooves.

[0041] Since existing light control films are mainly designed for LCDs, the reason is that even if the filling rate of the filling material decreases or there is a certain degree of non-uniformity, the observer will not recognize the resulting appearance defects.

[0042] However, when applying the light control film to an OLED display or the like, the filling rate and filling uniformity of the filling material are importantly related to whether the observer may recognize the defects caused by the light control film.

[0043] In the light control film, the average value and standard deviation of the depth of the regions unfilled with the filling material in a plurality of grooves filled with the filling material can be controlled.

[0044] The depth of the regions unfilled with the filling material will be described with reference to Figure 3 therein. Figure 3 For showing Figure 1 an enlarged cross-section of one groove 1003 among a plurality of grooves 1003 in the light control film 100.

[0045] As Figure 3 shown, the depth of the region unfilled 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 Figure 3 ). The first surface serving as the standard of the depth is a virtual surface or line connecting the first surfaces 1001 existing on both sides of the portion where the groove 1003 is formed ( Figure 3 1001I in

[0046] As Figure 3 shown, when there are two or more shortest distances, the shortest distance in calculating the average depth of the region unfilled with the filling material is the longest distance among the two or more shortest distances (in the case of Figure 3 , D2). By obtaining the shortest distance of each of the plurality of grooves formed in the main body and taking the arithmetic mean thereof, the average depth of the regions unfilled with the filling material can be obtained.

[0047] The lower limit of the average depth of the regions unfilled with the filling material in the plurality of grooves can be 0 μm, 0.5 μm, 1 μm, 1.5 μm or 2 μm. The upper limit of the average value can be around 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 value can also be adjusted within a range less than or equal to, or less than any one of the above upper limits; or within a range less than or equal to, or less than any one of the above upper limits and greater than or equal to, or greater than any one of the above lower limits.

[0048] The upper limit of the standard deviation of the depth of the regions unfilled with the filling material in the plurality of grooves can be around 0.2, 0.19, 0.18, 0.17, or 0.16, and the lower limit of the standard deviation can also be around 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 within a range less than or equal to, or less than, any of the above upper limits; or within a range less than or equal to, or less than, any of the above upper limits and greater than or equal to, or greater than, any of the above lower limits. The unit of the standard deviation can be μm.

[0049] In the light control film, the filling rate and filling uniformity of the filling material in the grooves 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 arranged adjacent to an observer, the light control film does not cause appearance defects due to the light control film.

[0050] To achieve the filling rate and filling uniformity, at least one of, or both or more of, the tensile strength of the main body, the elastic recovery force of the main body, and the shape of the grooves can be controlled as described below.

[0051] The shape of the grooves can be controlled in various ways to achieve the desired light control performance and / or filling characteristics.

[0052] As Figure 4 shown, in the cross-section of the main body of the light control film 100, the groove can have a first side 10031 extending from the first surface 1001 of the main body toward the second surface 1002 of the main 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 linear shape when observed in the normal direction of the first surface 1001 of the main body, the cross-section can be a cross-section perpendicular to the linear shape of the groove and in the direction parallel to the normal direction of the first surface 1001.

[0054] As Figure 4 shown, the groove can form a first angle (θ1 in Figure 4 ) formed by the first side 10031 and the normal direction of the first surface 1001, and a second angle (θ2 in Figure 4 ) formed by the second side 10032 and the normal direction of the first surface 1001.

[0055] The first angle and the second angle can 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. This angle can 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.

[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. This angle can 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.

[0058] The first angle and the second angle can be adjusted considering desired light control performance and / or filling characteristics, etc.

[0059] The first angle and the second angle can 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 can be 2 degrees or greater, and the second angle can be 2 degrees or less. In the above cases, 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 can be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees or 4 degrees, and its upper limit can be 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees or 2 degrees. The first angle can also be within a range greater than or equal to, or greater than, any one of the above lower limits; or within a range less than or equal to, or less than, any one of the above upper limits, while being within a range greater than or equal to, or greater than, any one of the above lower limits.

[0062] When the first angle and the second angle are different from each other, the upper limit of the second angle can be about 2 degrees, 1.5 degrees, 1 degree or 0.5 degrees, and its lower limit can be about 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees or 2 degrees. The second angle 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 less than or equal to, or less than, any one of the above upper limits while being greater than or equal to, or greater than, any one of the above lower limits.

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

[0064] Figure 5 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 not limited to this. That is, for example, in the light control film, only one of the first side and the second side can form two angles with the normal direction, and the other side can form only one angle, and one or more sides can also form three or more angles with the normal direction.

[0065] As Figure 5 Exemplarily shown, 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 can include a side A (10031A, 10032A) that forms an angle A ( Figure 5 θA in Figure 5 with the normal direction of the first surface 1001), and a side B (10031B, 10032B) that forms an angle B ( Figure 5 different from angle A.

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

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

[0068] Here, the lower limit of the angle B ( Figure 5 θB) in it can be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees or 4 degrees, and its upper limit can be about 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees or 2 degrees. The angle B can also be within the range greater than or equal to, or greater than any one of the above lower limits; or within the range less than or equal to, or less than any one of the above upper limits, while being within the range greater than or equal to, or greater than any one of the above lower limits.

[0069] Here, the upper limit of the angle A ( Figure 5 θA) in it can be about 2 degrees, 1.5 degrees, 1 degree or 0.5 degrees, and its lower limit can be about 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees or 2 degrees. The angle A can also be within the range less than or equal to, or less than any one of the above upper limits; or within the range less than or equal to, or less than any one of the above upper limits and at the same time greater than or equal to, or greater than any one of the above lower limits.

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

[0071] Here, the lower limit of the angle A ( Figure 5 θA) in it can be about 2 degrees, 2.5 degrees, 3 degrees, 3.5 degrees or 4 degrees, and its upper limit can be about 4 degrees, 3.5 degrees, 3 degrees, 2.5 degrees or 2 degrees. The angle A can also be within the range greater than or equal to, or greater than any one of the above lower limits; or within the range less than or equal to, or less than any one of the above upper limits, while being within the range greater than or equal to, or greater than any one of the above lower limits.

[0072] Here, the angle B (Figure 5 The upper limit of θB) therein can be about 2 degrees, 1.5 degrees, 1 degree or 0.5 degrees, and its lower limit can be about 0 degrees, 0.5 degrees, 1 degree, 1.5 degrees or 2 degrees. The angle B can also be within a range less than or equal to, or less than, any of the above upper limits; or within a range less than or equal to, or less than, any of the above upper limits and greater than or equal to, or greater than, any of the above lower limits.

[0073] As described above, when the first side or the second side of the groove includes side A and side B, R in the following formula 1 can 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 respectively, and θ A and θ B are angle A and angle B respectively.

[0077] In formula 1, there is no limitation on the unit of L A and L B as long as the same unit is applied to each other.

[0078] The lower limit of R in formula 1 can be about 5%, 10%, 15%, 20%, 25%, 30%, 35% or 40%, and its upper limit can be about 40%, 35%, 30%, 25%, 20%, 15%, 10% or 5%. R in formula 1 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.

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

[0080] To ensure desired filling characteristics and the like, the shape of the surface of the main body, particularly the shape of the first surface between the grooves, can be controlled.

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

[0082] By forming the above structure, the filling and removal 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. In addition, the surface characteristics of the light control film can be stably maintained.

[0083] As described above, when the grooves have a linear shape when observed in the normal direction of the first surface 1001 of the main body, the cross-section may be a cross-section perpendicular to the linear shape of the grooves and in the direction parallel to the normal direction of the first surface 1001.

[0084] The opposite side 10 may 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 may 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 the upper limit thereof may 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 may 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.

[0087] Here, the lower limit of the ratio θ21 / θ11 of the angle θ21 to θ11 can be around 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 its upper limit can be 100, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30, 25, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, or 9. The ratio θ21 / θ11 can 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 while being 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 the above H can be around 3μm, 2.5μm, 2μm, 1.5μm, 1μm, or 0.5μm. The lower limit of the above H can also be around 0.01μm, 0.05μm, 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 1μm, 1.5μm, 2μm, or 2.5μm. H can 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 while being less than or equal to, or less than, any of the above upper limits.

[0093] In the above structure, the total depth of the groove ( Figure 1 the H in T ) and the ratio H T / H of the H in the above Formula 2 can have a lower limit of around 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. The ratio H TThe upper limit of / H can be around 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. The ratio H T / H 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.

[0094] In the above structure, if the length of the opposite side is T, then T can 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 restriction on the units of T and L as long as the same unit is applied to each other.

[0099] The lower limit of K in formula 3 can be around 0.01, 0.05, 0.1, 0.15, or 0.2, and its upper limit can be around 2, 1.5, 1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, or 0.25. K 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.

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

[0101] The depth of the groove formed in the main body ( Figure 1 the H in T) There is no particular limitation on the range, and it can be adjusted considering the desired performance. The lower limit of the depth can be, for example, around 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, around 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 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. When there are a plurality of grooves and the depths of the relevant grooves are not constant, the depth of the grooves can be the arithmetic mean of the depths of the plurality of grooves.

[0102] The pitch of the plurality of grooves formed in the main body can also be adjusted considering the desired performance. Here, the pitch 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 said groove, as shown by P in Figure 1 . The lower limit of the pitch can be, for example, around 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 can also be, for example, around 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 pitches between the relevant grooves are not constant, the pitch of the grooves can be the arithmetic mean of the pitches of the plurality of grooves. The pitch of the grooves 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.

[0103] The width of the grooves formed in the main body can also be adjusted considering the desired performance. Here, the width is the dimension of the grooves determined on the first surface 1001 of the cross-section of the main body, as shown in Figure 1as shown by 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 a plurality of grooves and the widths of the relevant grooves are not constant, the width of the groove can be the arithmetic mean of the widths of the plurality of grooves. The width of the groove can also 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.

[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 around 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 the arithmetic mean. The difference (P - W1) can also 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.

[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 transmissive region) on the first surface of the main body can be about 60%, 65%, 70%, 75% or 80%. In another example, the upper limit of the aperture ratio (aperture ratio of the transmissive region) 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 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. The aperture ratio of the first surface is the ratio of the area of the transmissive region formed on the first surface to the total area of the first surface, and for example, referring to Figure 1 , which is the ratio of the area of the transmissive region formed on the first surface ( Figure 1 the area of the first surface 1001 in Figure 1 excluding the region where the width W1 is formed) to the total area of the first surface 1001.

[0107] In one example, the lower limit of the aperture ratio (aperture ratio of the transmissive region) on the second surface of the main body can be about 60%, 65%, 70%, 75%, 80%, 85% or 90%. The upper limit of the aperture ratio (aperture ratio of the transmissive region) on the second surface can be less than 100%, 95% or less, 90% or less, 85% or less, or about 80% or less. The aperture ratio 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. The aperture ratio of the second surface is the ratio of the area of the transmissive region formed on the second surface to the total area of the second surface, and for example, referring to Figure 1 , which is the ratio of the area of the transmissive region formed on the first surface ( Figure 2 the area of the second surface 1002 in Figure 2 excluding the region where the width W2 is formed) 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 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, while being less than or equal to, or less than any 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 considering 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 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, while being less than or equal to, or less than any 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 combination of any one of the three types of refractive index relationships described above and any range 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 Examples section of this specification.

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

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

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

[0118] When the pressure caused by the compression of the compression device disappears, the rate at which the main body recovers after being compressed also affects the filling rate. Therefore, it is recommended to use a main body with an appropriate level of elastic recovery force.

[0119] In one example, the lower limit of the tensile strength of the main 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 main 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 main body can 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 while being less than or equal to, or less than, any of the above upper limits. Such tensile strength can be measured by the method described in "2. Measurement of tensile strength" in the Examples section of this specification.

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

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

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

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

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

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

[0126] Regarding the content of the acrylic polymer in the main body, based on the total weight of the main body, its lower limit can be about 55 wt%, 60 wt%, 65 wt%, 70 wt%, 75 wt%, 80 wt%, 85 wt%, 90 wt%, or 95 wt%, and its upper limit can be about 100 wt%, 99 wt%, or 98 wt%. This ratio can also be 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.

[0127] In one example, the acrylic polymer can contain a specific type of bonding moiety to ensure the tensile strength and / or restoring properties as described above.

[0128] For example, the acrylic polymer can contain a bonding moiety represented by the following formula 1 and / or a bonding moiety represented by the following formula 2. The acrylic polymer can contain either one of the bonding moieties of formula 1 and formula 2, or can contain both.

[0129] [Formula 1]

[0130]

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

[0132] In the case where R1 is a single bond in Formula 1, it 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, if necessary, the benzene structure, the alkylene group and / or the alkylidene group may optionally be substituted with one or more substituents.

[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 around 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 around 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 the range greater than or equal to, or greater than any one of the above lower limits, while being in the range less than or equal to, or less than any one of the above upper limits.

[0138] In Formulas 1 and 2, the term alkylene group means a functional group in which two hydrogen atoms are separated from an alkane and connected to another object, and the two hydrogen atoms are separated from different carbon atoms of the alkane. Such an alkylene group may be an alkylene group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms. Such an alkylene group may be linear, branched or cyclic. Such an alkylene group may also optionally be substituted with one or more substituents. In particular, the alkylene group in Formula 1 may also optionally be substituted with one or more halogens. In this case, the halogens applied may be exemplified as fluorine, chlorine or iodine, etc., but are not limited thereto.

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

[0140] The bonding portion may contribute to the body exhibiting an appropriate level of tensile strength and / or recovery characteristics, and may also contribute to adjusting the refractive index of the body to an appropriate level.

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

[0142] For example, a method of forming an acrylic polymer by using a monomer containing such a bonding portion in its molecular structure as an acrylate may be applied.

[0143] Therefore, the acrylic polymer may contain acrylate units having the bonding portion of Formula 1 above, acrylate units having the bonding portion of Formula 2 above, and / or acrylate units having the bonding portion of Formula 1 above and the bonding portion of Formula 2 above.

[0144] An acrylate unit means the state in which an acrylate is contained in the acrylic polymer after polymerization or crosslinking.

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

[0146] Based on the total weight of the acrylate units contained in the acrylic polymer, the lower limit of the ratio of the acrylate units having the bonding moiety of Formula 2 above can be about 5 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%, 30 wt%, or 35 wt%, and the upper limit thereof can also be about 50 wt%, 45 wt%, 40 wt%, 35 wt%, 30 wt%, 25 wt%, 20 wt%, or 15 wt%. This content 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.

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

[0148] In order to control the tensile strength and / or the recovery characteristics, the acrylate can be a polyfunctional monomer having a bifunctionality or higher functionality. Here, the case where the monomer has a bifunctionality or higher functionality means the case where the number of (meth)acryloyl groups contained in the monomer is 2 or greater, 3 or greater, 4 or greater, or 5 or greater. The number of functional groups contained in the polyfunctional monomer can also be about 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 of the above upper limits and any of the above lower limits. In one example, the number of (meth)acryloyl groups contained in the polyfunctional monomer can be 2 or 3.

[0149] Based on the total weight of acrylate units contained in the acrylic polymer, the lower limit of the ratio of polyfunctional acrylate units can 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 can also 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%. This content can be within the range of less than or equal to, or less than any of the above upper limits; or within the range of greater than or equal to, or greater than any of the above lower limits; or within the range of greater than or equal to, or greater than any of the above lower limits, while being within the range of less than or equal to, or less than any of the above upper limits.

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

[0151] Relative to 100 parts by weight of polyfunctional acrylate units, the lower limit of the weight ratio of monofunctional 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. This ratio can be within the range of less than or equal to, or less than any of the above upper limits; or within the range of greater than or equal to, or greater than any of the above lower limits; or within the range of greater than or equal to, or greater than any of the above lower limits, while being within the range of less than or equal to, or less than any of the above upper limits.

[0152] The monofunctional and / or polyfunctional acrylate may contain the bonding moieties of Formula 1 and / or Formula 2 as described above.

[0153] There is no particular limitation on the specific type of the polyfunctional acrylate. For example, applicable polyfunctional acrylates may be exemplified as one selected from the following, or two or more thereof: bifunctional type, such as 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, neopentyl glycol hydroxypivalate di(meth)acrylate, dicyclopentyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified diphosphate di(meth)acrylate, di(meth)acryloyloxyethyl isocyanurate, allylated cyclohexyl di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, dimethylol dicyclopentane di(meth)acrylate, ethylene oxide-modified hexahydrophthalic acid di(meth)acrylate, neopentyl glycol-modified trimethylolpropane di(meth)acrylate, adamantane di(meth)acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene; trifunctional type, 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 type, such as diglycerol tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; pentafunctional type, such as propionic acid-modified dipentaerythritol penta(meth)acrylate; and hexafunctional type, such as dipentaerythritol hexa(meth)acrylate and caprolactone-modified dipentaerythritol hexa(meth)acrylate.

[0154] The monofunctional acrylate may be exemplified as (meth)acrylic acid alkyl ester, (meth)acrylic acid hydroxyalkyl ester, (meth)acrylic acid glycidyl ester, etc., but is not limited thereto.

[0155] The polyfunctional or monofunctional acrylate containing the bonding moiety of the above formula 1 and / or formula 2 may be exemplified as bisphenol diacrylate, such as modified bisphenol fluoride diacrylate, bisphenol A ethoxylated diacrylate, ortho-phenyl phenoxyl ethyl acrylate (OPPEA), and / or phenylbenzyl acrylate, etc., but is not limited thereto.

[0156] The main body may be formed using a curable material containing the above materials by known means such as an imprinting method, a pressing method, or an injection molding method.

[0157] The thickness of the main body can generally be in the range of 50 μm to 500 μm.

[0158] In the groove formed in the main body, there is a filling material, and the filling material contains a light absorption material.

[0159] Various types of filler materials for constructing a light control film are known, and known materials can also be used in the present application.

[0160] Generally, the filler material contains a resin material acting as a binder and a coloring material, pigment, or dye, etc. acting as a light absorption material. Applicable light absorption materials can be exemplified as 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 a black pigment such as carbon black, etc. In addition to black pigments, mixtures of various pigments and / or dyes of blue, purple, yellow, and red can also be used, or materials that are substantially formed black by mixing and dispersing a black coloring material with a blue, purple, yellow, or red coloring material. Blue pigments can be exemplified as copper phthalocyanine, etc.; purple pigments can be exemplified as di azine violet, etc.; yellow pigments can be exemplified as bisazo yellow, etc.; and red pigments can be exemplified as black horse phthal red tie pel, etc., but are not limited thereto, and in addition to the aforementioned pigments, dyes can also be used.

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

[0162] In addition to the above constitution, the light control film can also include additional constitutions.

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

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

[0165] There is no particular limitation on the specific type of the base film. For example, as the base film, an anisotropic polymer film having optical anisotropy imparted by stretching, or an isotropic film having no optical anisotropy, etc. can be used. Examples of the polymer film include, 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 among the monomers forming the polymer; and so on.

[0166] By applying an anisotropic polymer film having a large in-plane retardation as the base film, a light control film for preventing appearance defects can be effectively provided.

[0167] In one example, the lower limit of the in-plane retardation (based on a wavelength of 550 nm) of the anisotropic polymer film can be about 8,000 nm, 9,000 nm, 10,000 nm, 11,000 nm, or 12,000 nm, and the upper limit thereof can 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 retardation can 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, while being less than or equal to, or less than, any of the above upper limits. By applying a base film having such an in-plane retardation, the appearance of rainbow patterns or other color spots can be suppressed even when the light control film is exposed to polarized light or the like.

[0168] The in-plane retardation 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 retardation, nx is the refractive index of the film in the slow axis direction, ny is the refractive index of the film in the fast axis direction, and d is the thickness of the film. Here, the meanings of the slow axis and the fast axis are known in the industry.

[0172] There is no particular limitation on the type of the base film.

[0173] For example, representative examples of films that exhibit such in-plane retardation known in the industry are stretched polyester films, such as stretched PET (poly(ethylene terephthalate)) films.

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

[0175] As described above, if when observing the first surface in the normal direction of the first surface of the main body, the groove formed in the main body is formed to show a linear shape, the lower limit of the angle formed by the slow axis of the base film and the linear shape can be about 80 degrees, 85 degrees or 90 degrees, and the upper limit thereof can be about 90 degrees or 85 degrees. This 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, while being within a range less than or equal to, or less than any of the above upper limits.

[0176] In another example, as described above, if when observing the first surface in the normal direction of the first surface of the main body, the groove formed in the main body is formed to show a linear shape, the lower limit of the angle formed by the slow axis of the base film and the linear shape can be about 0 degrees, 2 degrees, 4 degrees, 6 degrees, 8 degrees or 10 degrees, and the upper limit thereof can be about 10 degrees, 8 degrees, 6 degrees, 4 degrees or 2 degrees. This 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, while being within a range less than or equal to, or less than any of the above upper limits.

[0177] The thickness of the base film can 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 an adhesive layer formed on one or both sides of the main body. The pressure-sensitive adhesive layer or the adhesive layer is applied to attach the light control film to a display device or the like. Figure 8 The case where a pressure-sensitive adhesive layer 3000 is formed on one side of the main body 100 is shown. In Figure 8 this case, the pressure-sensitive adhesive layer is formed on the first surface of the main body 100, and in this case, the first surface generally becomes the light input surface. The pressure-sensitive adhesive layer can also be formed on the second surface of the main body.

[0179] There is no particular limitation on the type of the pressure-sensitive adhesive layer or the adhesive layer. For example, an acrylic or silicone-based adhesive such as the so-called OCA (Optical Clear Adhesive) in the industry can be applied.

[0180] The thickness of the adhesive layer or the adhesive layer 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 components, any other required components may also be present.

[0182] This specification discloses an apparatus applying the light control film, such as a display device.

[0183] There is no particular limitation on the specific type of the display device to which the light control film can be applied. For example, the light control film can be applied to an LCD (Liquid Crystal Display), an OLED (Organic Light Emitting Diode) display, a PDP (Plasma Display Panel), etc.

[0184] In various display devices, in the case where there is no component (such as a backlight, a diffusion film, or a prism film) capable of compensating 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, where the light control film is set relatively close to the observer, a light control film that does not generate defects such as stripes that can be recognized by the observer and simultaneously exhibits desired performance can be provided.

[0185] Therefore, this specification discloses an OLED (Organic Light Emitting Diode) display (organic light emitting device) applying the light control film.

[0186] The display generally may include an organic light emitting panel and a light control film provided on the viewing side of the organic light emitting panel.

[0187] A polarizing layer is generally provided on the viewing side of the OLED (Organic Light Emitting Diode) display for antireflection and the like.

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

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

[0190] Here, for example, as Figure 2As shown, when the groove is formed in a linear shape when 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 linear 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. This 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, while being 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 the OLED (organic light emitting diode) display as described above, the distance between the polarizing layer and the light control film can vary, and in order to prevent defects such as ghosting or moiré patterns, 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 characteristics of the light control film can be adjusted according to the distance between the polarizing layer and the first surface to ensure desired characteristics.

[0193] For example, the case where the distance between the polarizing layer and the first surface is 250 μm or less is referred to as the first aspect, and the case where the distance is greater than 250 μm is referred to as the second aspect, and 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 can be about 240 μm, 230 μm, 220 μm, 210 μm, 200 μm or 195 μm, and the lower limit thereof can be about 50 μm, 100 μm, 150 μm or 185 μm. This distance 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, while being within a range less than or 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 can satisfy the relationship N1 > N2.

[0196] In this case, the lower limit of the difference N1 - N2 between the refractive indices N1 and N2 can be around 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 can be around 0.08, 0.075, 0.07, 0.065, 0.06, 0.055, 0.05, 0.045, 0.04 or 0.035. N1 - N2 can 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.

[0197] In this case, the first surface of the main body of the light control film can be set closer to the polarizing layer than the second surface, or the second surface can be set 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 region) on the first surface of the main body of the light control film can be around 60%, 65%, 70%, 75% or 80%. The upper limit of the aperture ratio (aperture ratio of the transmission region) on the first surface can be around 100%, 95%, 90%, 85%, 80%, 75%, 70% or 65%. The aperture ratio can 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. 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 around 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 around 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 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.

[0200] Figure 11Schematic 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 mainly depends on the pressure-sensitive adhesive layer or the adhesive layer 3000 attaching the light control film 4.

[0201] In a second aspect, the lower limit of the distance between the polarizing layer and the first surface can be about 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 can be about 1000 μm, 900 μm, 800 μm, 700 μm, 600 μm, 500 μm, or 400 μm. This distance can be in the range greater than or equal to, or greater than, any one of the above lower limits; or in the range greater than or equal to, or greater than, any one of the above lower limits, and at the same time in the range less than or equal to, or less than, any one 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 can satisfy the relationship N1 > N2.

[0203] In this case, the lower limit of the difference N1 - N2 between the refractive indices N1 and N2 can 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 can 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 can be in the range less than or equal to, or less than, any one of the above upper limits; or in the range greater than or equal to, or greater than, any one of the above lower limits; or in the range greater than or equal to, or greater than, any one of the above lower limits, and at the same time in the range less than or equal to, or less than, any one of the above upper limits.

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

[0205] In a second aspect, the lower limit of the aperture ratio (aperture ratio of the transmissive region) on the first surface of the light control film body may be about 60%, 65%, 70%, 75% or 80%. The upper limit of the aperture ratio (aperture ratio of the transmissive region) on the first surface may be about 100%, 95%, 90%, 85%, 80%, 75%, 70% or 65%. This aperture ratio may 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. 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 may be within a predetermined range. For example, the lower limit of the ratio (O2 / O1) may be about 1, 1.01, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35 or 1.4, and its upper limit may 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 may 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.

[0207] Figure 12 It 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, wherein the distance between the polarizing layer 3 and the first surface of the main body of the light control film 4 mainly depends on the pressure-sensitive adhesive layer or adhesive layer 3000 for attaching the light control film 4 and the transparent substrate 5.

[0208] When applying the light control film to an OLED display, by controlling the refractive index relationship according to the distance from the polarizing layer as above, 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 patterns 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 applying the light control film. When the light control film is applied to a display device, the light control film enables precise control of the light emission angle, ensures high transmittance, high brightness, and excellent resolution within the light emission angle, and blocks unnecessary light that can cause defects such as so-called ghosting or moiré patterns. Even when the light control film is applied to an OLED display, the light control film exhibits the above performances while preventing the appearance of defects such as stripes that can be recognized by an observer. This specification also discloses a display device applying the light control film. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0212] Figure 2 It is a view when observing the main body in the normal direction of the first surface of the main body.

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

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

[0215] Figure 5 It is a view for explaining side A and side B of the groove.

[0216] Figure 6 It is a view for explaining the specific shape of the end portion.

[0217] Figure 7 It is a view of a light control film further including a base film.

[0218] Figure 8 It is a view of a light control film further including a pressure-sensitive adhesive layer or an adhesive layer.

[0219] Figure 9 It is an SEM image of the cross-section of the light control film.

[0220] Figure 10 It shows the results of evaluating the brightness of the light control film at various viewing angles.

[0221] Figure 11 and Figure 12 It is a view for explaining an OLED display applying the light control film. DETAILED DESCRIPTION OF THE EMBODIMENTS

[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 by the following examples.

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

[0224] A material (main body material) for forming the main body of the light control film was prepared in a solvent-free form by mixing a modified bisphenol fluoride diacrylate (A) (Miwon Specialty Chemical, Miramer HR6100), TMPTA (trimethylolpropane triacrylate) (B), bisphenol A ethylene glycol diacrylate (C) (Cas No. 64401-02-1), OPPEA (o-phenylphenoxyethyl acrylate) (D), and PBA (phenylbenzyl acrylate) (E) as curable compounds. 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 main body 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 was manufactured using the main body material. The main body was manufactured in the manner disclosed in WO2021 / 145469A1.

[0226] The main body of the light control film was manufactured as follows: The base film 210 was unwound from the film supply device 10 disclosed in the above Figure 1 while the base film 210 was being supplied, the material was supplied to the coating device 20 to form a resin layer 220' on the base film 210, and the resin layer 220' imprinted by the pattern forming mold 30 was irradiated with light by the curing device 40 to cure it, and it was recovered to the collecting device 50.

[0227] By controlling the mold shape of the pattern forming mold 30, grooves having a desired shape were formed.

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

[0229] In the above process, OCF (Optical axis Control Film) of SKC (thickness: 125 μm) was used as the base film 210. When measured in the following manner, the in-plane retardation 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 Production Example 1 includes a base film and a main body formed on one side of the film, and the portion of the main body in contact with the base film becomes the second surface ( Figure 1 1002 in

[0231] Production Example 2. Preparation of a Filler Containing a Light Absorbing Material

[0232] The filler was prepared by blending carbon black as a light absorbing material into a resin material. The resin material was prepared by mixing an aliphatic urethane diacrylate (Photomer 6210, Cognis) (F) and carbon black (carbon black alone and powder obtained by converting carbon black into acrylic beads) (G). The mixing ratio of the above materials was set to a weight ratio (F:G) of about 67:20.

[0233] 1. Measurement of Refractive Index

[0234] Refractive Index of the Main Body (Transmission Region)

[0235] Two demolded glass plates were spaced apart by a gap spacer at an interval of about 100 μm, and the main body material obtained in Production Example 1 was injected between the two glass plates and then cured. Curing was carried out by light irradiation in the same manner as in Production Example 1. The refractive index of the cured material was measured. The refractive index was measured using an ABBE refractometer nD BrixDR-M4 device and was measured at a reference wavelength of about 589 nm.

[0236] Refractive Index of the Absorption Region

[0237] In the case of the filler forming the absorption region, which contains carbon black as a light absorbing material, it is difficult to directly measure the refractive index. In this case, the refractive index of the final filler can be determined as follows: The refractive index of the material other than carbon black in the same composition as the filler was measured in the same manner as the refractive index of the main body (transmission region), and the amount of added carbon black was taken into account. According to the linear mixing rule, whenever the amount of carbon black in the filler increases by about 1 wt%, the refractive index increases by about 0.009 due to the addition of the relevant carbon black. Therefore, the refractive index of the absorption region can be calculated based on this. The reference wavelength of the refractive index calculated in this example is the same as the reference wavelength of the refractive index of the main body.

[0238] 2. Measurement of Tensile Strength

[0239] Regarding the tensile strength, for a specimen having a horizontal length of about 45 mm, a vertical length of about 12.5 mm, and a thickness of about 2 mm, the tensile strength is measured at room temperature (about 25 °C) using a UTM (Universal Testing Machine) device. For example, a specimen can be manufactured by curing the main material described in Preparation Example 1 to this size, where the curing conditions are the same as those in Preparation Example 1. Fix the two ends of the specimen in the transverse direction to the device by about 8 mm, and measure the strength at the moment when the specimen breaks while stretching the specimen in the transverse direction at a speed of about 50 mm / second, and this strength is referred to as the tensile strength. As a result of measurement in this way, the tensile strength of the main material is about 13 MPa.

[0240] 3. Evaluation of elastic recovery force

[0241] The elastic recovery force of the specimen used in the measurement of tensile strength is evaluated using a pencil hardness tester. Load the specimen into the pencil hardness tester, apply a load of about 300 g to the main body with a 2H hardness pencil, and at the same time move the pencil forward in one direction at a speed of 20 mm / second to create a mark, then remove the pencil, and determine whether the mark created by the pencil disappears. As a result of measurement on the main body, the mark created by the 2H hardness pencil disappears within 10 seconds. The measurement is carried out at room temperature (about 25 °C).

[0242] 4. In-plane retardation evaluation of the base film

[0243] Using the Agilent UV / VIS spectrometer model 8453, measure the in-plane phase difference (Rin) of the base film for light with a wavelength of 550 nm. Install two polarizers on the UV / VIS spectrometer such that their transmission axes are orthogonal to each other, and install the base film between the two polarizers such that its slow axis forms a 45-degree angle with the transmission axes of the two polarizers respectively, and then measure the transmittance according to the wavelength. Obtain the phase delay order of each peak from the transmittance graph according to the wavelength. Specifically, in the transmittance graph according to the wavelength, the waveform satisfies the following formula A, and in the sine 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, and n is arranged into the λn and λn+1 formulas, the following formula C is obtained. Since n and λ can be obtained based on the fact that T in formula A and T in formula B are the same, R is obtained for each of λn, λn+1, λn+2, and λn+3. For 4 points, obtain the linear trend line of the R values according to the wavelength, and calculate the R value at 550 nm. The function of the linear trend line is Y = ax + b, where a and b are constants. When 550 nm is substituted for x in the above function, the Y value is the Rin value of the 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] Herein, 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] Manufacture the main body of the light control film 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. As Figure 1 shown, the main body is manufactured such 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 structure], a base film exists on the second surface 1002 of the main body).

[0253] As Figure 2 shown, a groove 1003 is formed such that when viewing the main body toward the first surface 1001, the groove 1003 forms a straight line on the first surface 1001. At this time, a straight line shape is formed at an angle of approximately 90 degrees with respect to the slow axis of the base film.

[0254] In the above structure, the pitch ( Figure 1 P in [the figure]) of the groove 1003 is formed to be approximately 40 μm; the width ( Figure 1 W1 in [the figure]) of the groove 1003 on the first surface 1001 is formed to be approximately 12 μm; the width of one end of the groove 1003 facing the second surface 1002 ( Figure 1 W2 in [the figure], corresponding to the length of the opposite side 10 in [the figure below]) is formed to be approximately 6 μm; the depth of the groove ( Figure 4 H in [the figure]) Figure 1 is formed to be approximately 90 μm; and T ) is formed to be approximately 90 μm; and Figure 1 L in [the figure] is formed to be approximately 20 μm to 35 μm.

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

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

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

[0258] A light control film is manufactured by filling the grooves 1003 of the main body with the filler prepared in Preparation Example 2 and curing it. The filler is prepared in the same manner as in Preparation Example 2, but it is prepared such that by adjusting the amount of carbon black, the refractive index of the relevant filler (absorbing region) is about 1.48. Since the refractive index of the main body (transmitting region) is about 1.511 to 1.541, the difference between the refractive index N1 of the transmitting region and the refractive index N2 of the absorbing region is about 0.03 to 0.06. The filling of the filler is carried out by a scraping process. That is, the filling is carried out as follows: the filler is applied to the surface of the main body where the grooves are formed, the applied filler is compressed using a knife to introduce the filler into the grooves, and then the material other than the material filled in the grooves is removed. Considering the composition of the filler, it is cured by irradiating the filler with light (ultraviolet light).

[0259] Example 2.

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

[0261] However, in this case, the shape of the grooves is formed in a multi-stage structure as shown in Figure 5 . In Figure 5 , the angle θA is set to about 3, and the angle θB is set to about 1.5. In addition, in Figure 5 , 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 aperture ratio on the first surface 1001 is about 75.4%, the aperture ratio on the second surface 1002 is about 91%, and the pitch of the grooves (the value of P corresponding to Figure 1 in Example 1) is about 61 μm, the width of the lower end of the grooves (the value of W1 corresponding to Figure 1 ) is about 15 μm, and the width of the upper end of the grooves (the value of W2 corresponding to Figure 1 ) is about 5.47 μm.

[0263] In addition, the depth of the grooves of the main body (the value of H corresponding to Figure 1 in T ) is about 150 μm. Except for the foregoing, the angle formed by the linear shape of the grooves and the slow axis of the base film and Figure 1 L in are the same as in Example 1.

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

[0265] Comparative Example 1.

[0266] The light control film was manufactured in the same manner as in Example 1, except that as the material for forming the main body, a transparent resin material commonly used in the production of light control films was used instead of the material in Preparation Example 1. As a result of evaluating the tensile strength of this material in the above manner, it was about 5 MPa or so, and when evaluating the elastic recovery force, the mark did not disappear after removing the pencil.

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

[0268] The filling characteristics of the filling material of the light control films of Example 1 and Comparative Example 1 were evaluated by SEM images. The filling characteristics were evaluated by photographing the cross-section of the light control film with an SEM (scanning electron microscope) device (JEOL, model JSM-7800F). The cross-section of the light control film was processed with a TXP pretreatment device and then photographed with the SEM device. When photographing, the BED-C observation mode was applied, and the magnification, working distance, and acceleration voltage were set to 100 times, 15 mm (working distance), and 15.0 kV, respectively. Figure 9 An image taken 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 of the unfilled filling material in all the grooves was determined based on the SEM images. As Figure 3 shown, the depth of the area of the unfilled filling material 200 was evaluated by measuring the shortest distance from the first surface 1001 of the main body ( Figure 3 D1, D2, etc. in), where the first surface as the standard of the depth is a virtual surface or line of the first surface 1001 existing on both sides of the part connecting the formation of the groove 1003 ( Figure 3 1001I in). In addition, in the case where there are two or more shortest distances, the average depth of the area of the unfilled filling material is calculated, and the shortest distance is the longest distance among 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] From the results in Table 1, it can be seen that Example 1 has a smaller average depth of the unfilled area and a smaller standard deviation of the depth compared to Comparative Example 1.

[0274] The presence of appearance defects in each of the light control films of Example 1 and Comparative Example 1 was evaluated. When determining whether slit defects, which are fine shadow defects, are observed within a viewing angle of up to 20 degrees based on the normal direction of the surface of each light control film, the presence of appearance defects was evaluated according to whether shadow defects were observed. As a result, in Comparative Example 1, many slit defects were observed within the viewing angle, but in the case of Example 1, no slit defects were observed throughout the viewing angle. As a result of the same evaluation for Example 2, the average value of the depth of the unfilled region was about 2.25 μm, and the standard deviation was about 0.18 μm, and even in this case, no appearance defects were observed.

[0275] Test Example 2. Measurement of brightness according to 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, whereby the brightness according to the viewing angle was evaluated, and the results are shown below. Figure 10 in.

[0277] Here, the method of changing the refractive index N1 of the transmission region can be carried out by changing the composition of the material used for the host. 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 ethylene glycol diacrylate (C), OPPEA (o-phenylphenoxyethyl acrylate) (D), and / or PBA (phenylbenzyl acrylate) (E) in the host material.

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

[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, and then it was attached to an OLED to produce Figure 11 an OLED panel. Here, an acrylic OCA (optical clear adhesive) commonly used for optical purposes was used as the pressure-sensitive adhesive layer.

[0281] When applied to Figure 11When forming the structure of [], the refractive index of the main body of the light control film is set to be about 1.511 to 1.541, and the refractive index of the filler is adjusted by the amount of carbon black. Thus, the difference (N1 - N2) between the refractive index N1 of the transmission region and the refractive index N2 of the absorption region is set to be about 0.03 to 0.06.

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

[0283] Since the thickness of 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 angle formed between the absorption axis of the polarizing layer (pol) and the linear shape formed by the grooves of the light control film (see Figure 2 ) is set to be about 7 degrees to 8 degrees.

[0284] For the OLED with the above structure, the appearance defects are evaluated according to the method of Test Example 1, and the brightness according to the viewing angle is evaluated according to Test Example 2. Thus, it is determined that no appearance defects are observed, and the transmittance control characteristics are ensured according to the viewing angle. In addition, no defects such as ghosting phenomena are determined.

[0285] Example 4.

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

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

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

[0289] SinceFigure 12 The thickness of the OCA in the structure is about 25 μm, and the thickness of the glass substrate is about 300 μm. Therefore, 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 angle formed between the absorption axis of the polarizing layer (pol) and the linear shape formed by the grooves of the light control film (see Figure 2 ) is set to about 4 degrees to 6 degrees.

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

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 extending toward the second surface are formed on the first surface; And A filling material that fills the grooves and contains a light absorption material, wherein The refractive index N1 of the main body and the refractive index N2 of the filling material satisfy the relationship N1 > N2, and The difference between the refractive index N1 and the refractive index N2 is greater than 0 and is 0.1 or less.

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

3. The light control film according to claim 1, wherein in a cross-section of the main body, the groove has a first side extending from the first surface of the main body toward the second surface of the main 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 the normal direction of the first surface, and a second angle formed by the second side and the normal direction of the second surface are each in the range of 0 degrees to 10 degrees.

4. The light control film according to claim 3, 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.

5. The light control film according to claim 1, wherein in a cross-section of the main body, the groove has a first side extending from the first surface of the main body toward the second surface of the main 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 that forms an angle A with the normal direction of the first surface, and a side B that forms an angle B different from the angle A.

6. The light control film according to claim 5, wherein the side B is positioned closer to the second surface of the main body than the side A, and The angle A is 3 degrees or greater, and the angle B is 2 degrees or less.

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

8. The light control film according to claim 1, wherein the depth of the groove formed in the main body is in the range of 50 μm to 200 μm, The pitch of the plurality of grooves formed in the main body is in the range of 10 μm to 150 μm or less, and The width of the groove formed on the first surface of the main body is in the range of 1 μm to 50 μm.

9. The light control film according to claim 1, wherein the tensile strength of the main body is 7 MPa or greater.

10. The light control film according to claim 1, wherein the main body comprises an acrylic polymer containing one or more bonding moieties selected from the bonding moiety of Formula 1 below and the bonding moiety of Formula 2 below: [Formula 1] Among them, 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.

11. The light control film according to claim 10, wherein the acrylic polymer comprises acrylate units having one or more bonding moieties selected from the bonding moiety of Formula 1 and the bonding moiety of Formula 2.

12. The light control film according to claim 11, wherein based on the total weight of the acrylate units contained in the acrylic polymer, the ratio of the acrylate units containing the bonding moiety of Formula 1 is in the range of 20% by weight to 90% by weight.

13. The light control film according to claim 11, wherein based on the total weight of the acrylate units contained in the acrylic polymer, the ratio of the acrylate units containing the bonding moiety of Formula 2 is in the range of 5% by weight to 40% by weight.

14. The light control film according to claim 11, wherein based on the total weight of the acrylate units contained in the acrylic polymer, the ratio of the polyfunctional acrylate units is in the range of 5% by weight to 80% by weight.

15. An organic light emitting device, comprising: an organic light emitting panel; and the light control film according to claim 1 disposed on the viewing side of the organic light emitting panel.

16. The organic light emitting device according to claim 15, 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 disposed on a side surface of the polarizing layer opposite to the surface facing the organic light emitting panel.

17. The organic light emitting device according to claim 16, wherein the first surface of the main body of the light control film is arranged to be 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 the difference N1 - N2 between the refractive index N1 of the main body and the refractive index N2 of the filling material is in the range of 0.03 to 0.

06.

18. The organic light emitting device according to claim 16, wherein the first surface of the main body of the light control film is arranged to be 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 the difference N1 - N2 between the refractive index N1 of the main body and the refractive index N2 of the filling material is in the range of 0.02 to 0.05.

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