Optical film and display device including the same

Abstract

The present invention discloses an optical film and a display device including the optical film. An optical film includes: a first pattern layer including a first substrate portion and a first protrusion portion arranged on the first substrate portion to be spaced apart from each other and having a first refractive index; and a second pattern layer arranged on the first pattern layer and having a second refractive index. Each of the plurality of first protrusion portions includes: a first sub-protrusion portion having a first width in a cross section perpendicular to the first substrate portion; a second sub-protrusion portion arranged between the first substrate portion and the first sub-protrusion portion and having a width that increases from the first sub-protrusion portion to the first substrate portion; and a third sub-protrusion portion arranged on the first sub-protrusion portion and having a width that decreases as the distance from the first sub-protrusion portion increases.

Description

[0001] This application claims priority to and all benefits derived from Korean Patent Application No. 10-2019-0064621, filed on May 31, 2019, the entire contents of which are incorporated herein by reference. Technical Field

[0002] Exemplary embodiments of the present invention relate to an optical film and a display device including the optical film. More particularly, exemplary embodiments of the present invention relate to an optical film including two patterns having different refractive indices and a display device including the optical film. Background Art

[0003] Various display devices are being used to provide image information, and liquid crystal display devices are widely used for large display devices and portable display devices due to various advantages such as low power consumption.

[0004] The liquid crystal display device provides light emitted from the backlight unit to the liquid crystal display panel to display an image. In addition, the liquid crystal display device includes an optical film having various functions, which is added to the outside of the liquid crystal display panel to improve display quality that is often deteriorated due to a viewing angle. Summary of the invention

[0005] Exemplary embodiments of the present invention provide an optical film capable of improving a side viewing angle characteristic of a display device.

[0006] Exemplary embodiments of the present invention provide a display device having improved side viewing characteristics by optimizing the shape of a pattern layer in an optical film.

[0007] An exemplary embodiment of the present invention provides an optical film, comprising: a first pattern layer having a first refractive index and including a first substrate portion and a plurality of first protrusion portions arranged on the first substrate portion and spaced apart from each other; and a second pattern layer arranged on the first pattern layer and having a second refractive index different from the first refractive index. Each of the plurality of first protrusion portions comprises: a first sub-protrusion portion having a first width in a cross section perpendicular to the first substrate portion; a second sub-protrusion portion arranged between the first substrate portion and the first sub-protrusion portion and having a width increasing from the first sub-protrusion portion to the first substrate portion; and a third sub-protrusion portion arranged on the first sub-protrusion portion and having a width decreasing as the distance from the first sub-protrusion portion increases.

[0008] In exemplary embodiments, an absolute value of a difference between the first refractive index and the second refractive index may be in a range from about 0.2 to about 0.25.

[0009] In an exemplary embodiment, the first sub-protrusion may include a first sub-bottom surface adjacent to the second sub-protrusion, a first sub-upper surface facing the first sub-bottom surface, and a first sub-side surface connecting the first sub-bottom surface and the first sub-upper surface, and the first sub-side surface may have an inclination angle from about 86 degrees to about 90 degrees relative to the first sub-bottom surface.

[0010] In an exemplary embodiment, the first refractive index may be smaller than the second refractive index, and in a cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protrusion portions among the plurality of first protrusion portions is 1:1. P1 and a first width W of the first sub-protrusion 1 can have a relationship represented by the following equation 1,

[0011] Equation 1

[0012] 0.15≤W 1 / W P1 ≤0.45, where W P1 By setting the first width W of the first sub-protrusion 1 The minimum distance W between the first sub-protrusion and the adjacent first protrusion 2 Add them together and W 1 and W 2 Corresponds to the distance in the direction perpendicular to the extending direction of the first protruding portion.

[0013] In an exemplary embodiment, the first refractive index may be smaller than the second refractive index, and in a cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protrusion portions among the plurality of first protrusion portions is 1:1. P1 and a height H of each of the plurality of first protruding portions 1 can have a relationship represented by the following equation 2,

[0014] Equation 2

[0015] 0.75≤H 1 / W P1 ≤1.35, where W P1I By setting the first width W of the first sub-protrusion 1 The minimum distance W between the first sub-protrusion and the adjacent first protrusion 2 Add them together and W 1 and W 2 Corresponds to the distance in the direction perpendicular to the extending direction of the first protruding portion.

[0016] In an exemplary embodiment, the first sub-protrusion portion may have a rectangular shape in a cross section perpendicular to the first base portion, and each of the second and third sub-protrusion portions may have a trapezoidal shape in a cross section perpendicular to the first base portion.

[0017] In an exemplary embodiment, a width of an upper surface of the second sub-protrusion may be equal to a first width of the first sub-protrusion, and a width of a lower surface of the third sub-protrusion may be equal to the first width of the first sub-protrusion.

[0018] In an exemplary embodiment, the second sub-protrusion portion may include a second sub-bottom surface adjacent to the first base portion, a second sub-upper surface facing the second sub-bottom surface, and a second sub-side surface connecting the second sub-bottom surface and the second sub-upper surface, and the second sub-side surface may have an inclination angle from about 69 degrees to about 83 degrees relative to the second sub-bottom surface.

[0019] In an exemplary embodiment, in a cross section of the second sub-protruding portion perpendicular to the first base portion, the maximum width W of the second sub-bottom surface is B2 and the maximum width W of the second sub-upper surface C2 The following equation 3 may be satisfied.

[0020] Equation 3

[0021] 0.67≤W C2 / W B2 ≤0.91

[0022] In an exemplary embodiment, in a cross section of the first protruding portion perpendicular to the first base portion, a maximum height H of the first protruding portion in the thickness direction is 1 and the maximum height H of the second sub-protrusion in the thickness direction S2 The following equation 4 may be satisfied.

[0023] Equation 4

[0024] 0.06≤H S2 / H 1 ≤0.17

[0025] In an exemplary embodiment, the third sub-protrusion may include a third sub-bottom surface adjacent to the first sub-protrusion, a third sub-upper surface facing the third sub-bottom surface, and a third sub-side surface connecting the third sub-bottom surface and the third sub-upper surface, and the third sub-side surface may have an inclination angle from about 69 degrees to about 83 degrees relative to the third sub-bottom surface.

[0026] In an exemplary embodiment, in a cross section of the third sub-protruding portion perpendicular to the first base portion, a maximum width W of the third sub-bottom surface is B3and the maximum width W of the third sub-upper surface C3 The following equation 5 may be satisfied.

[0027] Equation 5

[0028] 0.67≤W C3 / W B3 ≤0.90

[0029] In an exemplary embodiment, in a cross section perpendicular to the first base portion of each of the plurality of first protruding portions, a maximum height H of the first protruding portion in the thickness direction is 200 mm / s. 1 and the maximum height H of the third sub-protrusion in the thickness direction S3 The following equation 6 may be satisfied.

[0030] Equation 6

[0031] 0.06≤H S3 / H 1 ≤0.17

[0032] In exemplary embodiments, the second pattern layer may include a second substrate portion facing the first substrate portion and a plurality of second protrusion portions disposed under the second substrate portion.

[0033] In an exemplary embodiment, each of the first protrusion portion and the second protrusion portion may have a stripe shape extending in one direction.

[0034] In an exemplary embodiment, the first pattern layer may further include a first recessed portion defined between the plurality of first protruding portions, the second pattern layer may further include a second recessed portion defined between the plurality of second protruding portions, the plurality of first protruding portions may respectively correspond to the second recessed portions, and the plurality of second protruding portions may respectively correspond to the first recessed portions.

[0035] An exemplary embodiment of the present invention provides a display device including a liquid crystal display panel and an optical film arranged on the liquid crystal display panel. The optical film includes: a first pattern layer having a first refractive index and including a first substrate portion and a plurality of first protrusions arranged on the first substrate portion and spaced apart from each other; and a second pattern layer arranged on the first pattern layer and having a second refractive index different from the first refractive index. Each of the plurality of first protrusions includes: a first sub-protrusion having a first width in a cross section perpendicular to the first substrate portion; a second sub-protrusion arranged between the first substrate portion and the first sub-protrusion and having a width that increases from the first sub-protrusion to the first substrate portion; and a third sub-protrusion arranged on the first sub-protrusion and having a width that decreases as the distance from the first sub-protrusion increases.

[0036] In exemplary embodiments, an absolute value of a difference between the first refractive index and the second refractive index may be in a range from about 0.2 to about 0.25.

[0037] In an exemplary embodiment, the first refractive index is smaller than the second refractive index, and in a cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protruding portions among the plurality of first protruding portions is 1:1. P1 and a first width W of the first sub-protrusion 1 can have a relationship represented by the following equation 1,

[0038] Equation 1

[0039] 0.15≤W 1 / W P1 ≤0.45, where W P1 By setting the first width W of the first sub-protrusion 1 The minimum distance W between the first sub-protrusion and the adjacent first protrusion 2 Add them together and W 1 and W 2 Corresponds to the distance in the direction perpendicular to the extending direction of the first protruding portion.

[0040] In an exemplary embodiment, the first refractive index may be smaller than the second refractive index, and in a cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protrusion portions among the plurality of first protrusion portions is 1:1. P1 and a height H of each of the plurality of first protruding portions 1 can have a relationship represented by the following equation 2,

[0041] Equation 2

[0042] 0.75≤H 1 / W P1 ≤1.35, where W P1 By setting the first width W of the first sub-protrusion 1 The minimum distance W between the first sub-protrusion and the adjacent first protrusion 2 Add them together and W 1 and W 2 Corresponds to the distance in the direction perpendicular to the extending direction of the first protruding portion.

[0043] In an exemplary embodiment, the second pattern layer may include a second substrate portion facing the first substrate portion and a plurality of second protrusions arranged below the second substrate portion. Each of the plurality of second protrusions may include: a fourth sub-protrusion having a second width in a cross section perpendicular to the second substrate portion; a fifth sub-protrusion arranged between the second substrate portion and the fourth sub-protrusion and having a width increasing from the fourth sub-protrusion to the second substrate portion; and a sixth sub-protrusion arranged between the first substrate portion and the fourth sub-protrusion and having a width decreasing from the fourth sub-protrusion to the first substrate portion.

[0044] In an exemplary embodiment, the first refractive index may be greater than the second refractive index, and in a cross section perpendicular to the second substrate portion, an interval W between second protrusion portions adjacent to each other among the plurality of second protrusion portions is 1:1. P2 and a second width W of the fourth sub-protrusion 2-1 can have a relationship represented by the following equation 1-1,

[0045] Equation 1-1

[0046] 0.15≤W 2-1 / W P2 ≤0.45, where W P2 By setting the second width W of the fourth sub-protrusion 2-1 The minimum distance W between the fourth sub-protrusion of the adjacent second protrusion 1-1 Add them together and W 1-1 and W 2-1 Corresponds to the distance in the direction perpendicular to the extending direction of the second protruding portion.

[0047] In an exemplary embodiment, the first refractive index may be greater than the second refractive index, and in a cross section perpendicular to the second substrate portion, an interval W between second protrusion portions adjacent to each other among the plurality of second protrusion portions is 1:1. P2 and a height H of each of the plurality of second protruding portions 2-1 can have a relationship represented by the following equation 2-1,

[0048] Equation 2-1

[0049] 0.75≤H 2-1 / W P2 ≤1.35, where W P2 By setting the second width W of the fourth sub-protrusion 2-1 The minimum distance W between the fourth sub-protrusion of the adjacent second protrusion 1-1 Add them together and W 1-1 and W 2-1Corresponds to the distance in the direction perpendicular to the extending direction of the second protruding portion.

[0050] In an exemplary embodiment, the first sub-protrusion portion may have a rectangular shape in a cross section perpendicular to the first base portion, and each of the second and third sub-protrusion portions may have a trapezoidal shape in a cross section perpendicular to the first base portion.

[0051] According to the above-described exemplary embodiments, the optical film includes the pattern layer in which the shape of the protrusion portion is optimized, and thus the display quality of the display device may be improved.

[0052] In addition, since the display device includes an optical film having a pattern layer with a relatively low refractive index, and the shape and arrangement interval of the protrusions in the pattern layer are optimized, the display quality of the display device in front and side viewing directions can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and other advantages of the present invention will become more readily apparent with reference to the following detailed description considered in conjunction with the accompanying drawings, in which:

[0054] Figure 1 is a perspective view showing an exemplary embodiment of an electronic device according to the present invention;

[0055] Figure 2 is an exploded perspective view showing an exemplary embodiment of an electronic device according to the present invention;

[0056] Figure 3 is a cross-sectional view showing an exemplary embodiment of a display device according to the present invention;

[0057] Figure 4 is a cross-sectional view showing an exemplary embodiment of a light source member according to the present invention;

[0058] Figure 5 is an exploded perspective view showing an exemplary embodiment of an optical film according to the present invention;

[0059] Figure 6 is a cross-sectional view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0060] Fig. 7A is a perspective view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0061] Figure 7B is a cross-sectional view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0062] Figure 7C is a cross-sectional view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0063] Figure 8 is an exploded perspective view showing an exemplary embodiment of an optical film according to the present invention;

[0064] Fig. 9 is a perspective view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0065] Fig.10 is a perspective view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0066] Fig.11 is a cross-sectional view showing an exemplary embodiment of a display device according to the present invention;

[0067] Fig. 12A is a cross-sectional view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0068] Fig. 12B is a cross-sectional view showing an exemplary embodiment of a portion of an optical film according to the present invention;

[0069] Fig.13A and Fig. 13B are diagrams showing light paths in a comparative example and an example of an embodiment of an optical film, respectively;

[0070] Fig.14A It is shown that including Fig.13A A graph of optical characteristics of a display device of an optical film having a pattern shape;

[0071] Fig. 14B It is shown that including Fig. 13B A graph of optical characteristics of a display device of an optical film having a pattern shape;

[0072] Fig.15 is a graph showing changes in optical characteristics of a display device according to refractive index characteristics of an optical film;

[0073] Fig.16A and Fig. 16B is a graph showing optical characteristics of an exemplary embodiment of a display device according to the present invention and optical characteristics of a comparative example; and

[0074] Fig.17 is a cross-sectional view showing an exemplary embodiment of a display device according to the present invention. DETAILED DESCRIPTION

[0075] In the present disclosure, various modifications and implementations can be made to the present disclosure in many different forms, and therefore, specific embodiments will be illustrated in the drawings and described in detail below. However, the present disclosure should not be limited to a specific disclosure form, and is interpreted as including all modifications, equivalents or replacements included in the spirit and scope of the present invention.

[0076] It will be understood that when an element (or region, layer or portion) is referred to as being "on," "connected to" or "coupled to" another element or layer, it can be directly on, directly connected to or coupled to the other element or layer, or intervening elements or layers may be present.

[0077] In contrast, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0078] In the present disclosure, the expression "directly arranged" means that there is no intermediate element such as a layer, film, region or plate between an element and other elements. For example, the expression "directly arranged" means that two layers or two components are arranged without an additional component such as a bonding component between them.

[0079] Throughout the entire text, the same reference numerals refer to the same elements. In the drawings, in order to effectively describe the technical contents, the thickness, ratio and size of components are exaggerated.

[0080] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0081] It will be understood that, although the terms first, second, etc. can be used in this article to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teaching of the present disclosure, the first element, first component, first area, first layer or first part discussed below can be referred to as the second element, second component, second area, second layer or second part. As used in this article, the singular form "one" and "the (described)" are intended to also include plural forms, unless the context clearly indicates otherwise.

[0082] For ease of description, spatially relative terms such as "under", "below", "lower", "over", "upper", etc. may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the drawings.

[0083] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. Such terms as defined in commonly used dictionaries should be interpreted as having the same meaning as the contextual meaning in the relevant technical field, and should not be interpreted as having an idealized or overly formal meaning, unless explicitly defined as having such a meaning in the application.

[0084] It will be further understood that when the terms “include” and / or “comprises” are used in this specification, they indicate the presence of stated features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups thereof.

[0085] As used herein, "about" or "approximately" includes the stated value and refers to within an acceptable range of deviation of the particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0086] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal sense, unless explicitly defined herein.

[0087] Herein, exemplary embodiments are described with reference to cross-sectional illustrations, which are schematic illustrations of rationalized embodiments. As such, variations in the illustrated shapes as a result of, for example, manufacturing techniques and / or tolerances should be expected. Therefore, the embodiments described herein should not be interpreted as being limited to the specific shapes of the regions illustrated herein, but will include deviations in shapes caused by, for example, manufacturing. For example, an area illustrated or described as flat may typically have rounded and / or nonlinear features. Moreover, the illustrated sharp corners may be rounded. Therefore, the regions illustrated in the drawings are schematic in nature, and their shapes are not intended to illustrate the precise shapes of the regions and are not intended to limit the scope of the claims.

[0088] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[0089] Figure 1is a perspective view showing an exemplary embodiment of an electronic device according to the present invention. Figure 2 is an exploded perspective view showing an exemplary embodiment of an electronic device according to the present invention. Figure 3 is a cross-sectional view showing an exemplary embodiment of a display device according to the present invention. Figure 3 Shown along Figure 2 A cross-sectional view taken along line II'. Figure 4 is a cross-sectional view showing an exemplary embodiment of a light source member according to the present invention.

[0090] Figures 5 to 7C is a diagram showing an exemplary embodiment of an optical film according to the present invention. Figure 5 is an exploded perspective view showing an exemplary embodiment of an optical film according to the present invention. Figure 6 is a cross-sectional view showing an exemplary embodiment of a portion of an optical film according to the present invention, and Fig. 7A is a perspective view showing an exemplary embodiment of a portion of an optical film according to the present invention. Figure 6 Shown along Figure 5 A cross-sectional view taken along line II-II'. Figure 7B and Figure 7C is a cross-sectional view showing an exemplary embodiment of a portion of an optical film according to the present invention.

[0091] In an exemplary embodiment, the electronic device ED may be a large electronic product such as a television, a monitor, or an outdoor billboard. In addition, the electronic device ED may be a small or medium-sized electronic product such as a personal computer, a notebook computer, a personal digital assistant, a car navigation unit, a game unit, a smart phone, a tablet computer, or a camera. However, these are merely exemplary, and the electronic device ED may be adopted in other electronic products as long as they do not depart from the concept of the present invention.

[0092] The electronic device ED may include a display device DD and a housing HAU. The electronic device ED displays an image IM through a display surface IS. Figure 1 , the display surface IS is shown to be substantially parallel to a surface defined by the first direction axis DR1 and the second direction axis DR2, the second direction axis DR2 intersecting the first direction axis DR1. However, this is merely exemplary, and in another exemplary embodiment, the display surface IS of the electronic device ED may have a curved shape.

[0093] The third direction axis DR3 indicates the normal direction of the display surface IS, that is, the direction in which the image IM is displayed in the thickness direction of the electronic device ED. In addition, the fourth direction axis DR4 indicates the direction opposite to the third direction axis DR3 in the thickness direction of the electronic device ED. The front (or upper) surface and the rear (or lower) surface of each component or each unit described below are distinguished from each other by the third direction axis DR3. However, the directions indicated by the first direction axis DR1, the second direction axis DR2, the third direction axis DR3 and the fourth direction axis DR4 are relative to each other and can be changed to other directions.

[0094] The housing HAU may house the display device DD. The housing HAU may be arranged to cover the display device DD, but the upper surface as the display surface IS of the display device DD is exposed. The housing HAU may cover the side surface and the bottom surface of the display device DD, and may expose the entirety of the upper surface. However, the present invention should not be limited to or thereby, and in another exemplary embodiment, the housing HAU may cover a portion of the upper surface of the display device DD in addition to the side surface and the bottom surface of the display device DD.

[0095] The display device DD may include a light source member LU, a liquid crystal display panel DP, and an optical member OU. The light source member LU may be disposed under the liquid crystal display panel DP, and the optical member OU may be disposed on the liquid crystal display panel DP.

[0096] In an exemplary embodiment of the display device DD, the optical member OU includes an optical film OF. The optical film OF is disposed on the liquid crystal display panel DP. The optical member OU includes the optical film OF and a base film BS supporting the optical film OF.

[0097] Figure 4 is a cross-sectional view showing an exemplary embodiment of a light source member LU. The light source member LU may include a light source LS and a functional layer FL for transmitting light emitted from the light source LS to the liquid crystal display panel DP. The functional layer FL may include a guide panel GP, a low refractive index layer LRL arranged on the guide panel GP, and a color conversion layer CCL arranged on the low refractive index layer LRL. The light source LS may be arranged on at least one side of the guide panel GP. The light source member LU may further include a blocking layer CPL arranged on the color conversion layer CCL. In addition, a plurality of light exit patterns CP may be arranged on the lower surface of the guide panel GP.

[0098] In an exemplary embodiment, the light source LS of the light source member LU may include a circuit board PB and a plurality of light emitting element packages LD arranged on the circuit board PB. The light emitting element package LD may emit light in the same wavelength range. In addition, unlike the above, the light source LS may include a plurality of light emitting element packages LD that emit light in wavelength ranges different from each other. In an exemplary embodiment, the light emitting element package LD may emit a first light having a central wavelength in a wavelength range of, for example, equal to or greater than about 440 nanometers (nm) and equal to or less than about 460 nm. In an exemplary embodiment, the light emitting element package LD may emit, for example, blue light.

[0099] exist Figure 2 In the exemplary embodiment shown in FIG. 1 , the light source LS is arranged adjacent to one side surface of the guide panel GP, however, the present invention should not be limited thereto or thereby. In other exemplary embodiments, Figure 2 or Figure 4 Unlike what is shown in FIG. 2 , the light source LS may be additionally arranged adjacent to a plurality of side surfaces of the guide panel GP.

[0100] In addition, unlike what is shown in the drawings, the light source LS may be disposed below the guide panel GP. That is, the light source LS may be a direct illumination type light source.

[0101] The guide panel GP may be a glass substrate, however, the guide panel GP should not be limited thereto or thereby. The guide panel GP may be a transparent resin substrate. In an exemplary embodiment, the guide panel GP may include, for example, an acrylic resin.

[0102] The light exit pattern CP arranged on the lower surface of the guide panel GP can transmit light emitted from the light source LS and incident through one side surface of the guide panel GP to the other side surface of the guide panel GP, or can change the light propagation direction so that the light incident through the lower surface of the guide panel GP is transmitted to the light exit surface which is the upper surface of the guide panel GP.

[0103] The low refractive index layer LRL may be arranged on the guide panel GP. The low refractive index layer LRL may be directly arranged on the guide panel GP. The low refractive index layer LRL may have a refractive index smaller than that of the guide panel GP. Since the low refractive index layer LRL has a refractive index smaller than that of the guide panel GP, the low refractive index layer LRL may allow light incident from the light source LS through the side surface of the guide panel GP to be effectively transmitted to the other side surface of the guide panel GP that is relatively spaced apart from the light source LS. That is, the guide panel GP of the light source assembly LU and the low refractive index layer LRL arranged on the guide panel GP may perform the function of a light guide plate.

[0104] The light source member LU includes a color conversion layer CCL arranged on the low refractive index layer LRL. The color conversion layer CCL converts the color of the light provided from the light source LS and transmits the light to the liquid crystal display panel DP. For example, in an exemplary embodiment, the light provided from the light source LS may be provided to the liquid crystal display panel DP as white light after passing through the color conversion layer CCL. In an exemplary embodiment, the color conversion layer CCL may include a plurality of quantum dots QD1 and QD2 that convert the color of the light incident thereon into colors within wavelength ranges different from each other. When the light provided from the light source LS is the first light within a blue light wavelength range, the color conversion layer CCL may include a first quantum dot QD1 that is excited by the blue light to emit green light and a second quantum dot QD2 that is excited by the blue light to emit red light.

[0105] The barrier layer CPL may be disposed on the color conversion layer CCL. The barrier layer CPL may prevent moisture and / or oxygen (hereinafter referred to as "moisture / oxygen") from penetrating into the color conversion layer CCL. The barrier layer CPL may cover the color conversion layer CCL.

[0106] The liquid crystal display panel DP is disposed on the light source unit LU. The liquid crystal display panel DP may include a first substrate SUB1, a second substrate SUB2 facing the first substrate SUB1, and a liquid crystal layer LCL disposed between the first substrate SUB1 and the second substrate SUB2.

[0107] The liquid crystal display panel DP may include a display area DA and a peripheral area NDA surrounding the display area DA. The image IM is displayed through the display area DA, but not through the peripheral area NDA defined adjacent to the display area DA in a plan view. The liquid crystal display panel DP may include a plurality of pixels disposed in the display area DA.

[0108] The signal lines and pixel circuits of the pixels are arranged on one of the first substrate SUB1 and the second substrate SUB2 (hereinafter referred to as the "array substrate"). In an exemplary embodiment, the array substrate may be connected to the main circuit board, for example, via a chip on film ("COF"). The main circuit board may include a central control circuit arranged therein to drive the liquid crystal display panel DP. The central control circuit may be, but is not limited to, a microprocessor. The COF may be, but is not limited to, a data drive circuit. In an exemplary embodiment, the gate drive circuit may be arranged (e.g., mounted) on the array substrate, or may be directly integrated on the array substrate in the form of low temperature polycrystalline silicon ("LTPS").

[0109] The liquid crystal layer LCL includes liquid crystals. In an exemplary embodiment, the liquid crystal layer LCL of the liquid crystal display panel DP may include vertically oriented liquid crystals. The liquid crystals contained in the liquid crystal layer LCL may be vertically oriented relative to the first substrate SUB1 or the second substrate SUB2. For example, in an exemplary embodiment, the liquid crystals may be oriented at an inclination angle in a range of about 88 degrees to about 90 degrees relative to the upper surface of the first substrate SUB1 or the lower surface of the second substrate SUB2. In an exemplary embodiment, the liquid crystal display panel DP of the display device DD may be a liquid crystal display panel in a vertical orientation mode.

[0110] However, the present invention should not be limited to or constrained thereto. That is, as the liquid crystal display panel DP of the display device DD, various display panels may be used, such as a display panel in a twisted nematic ("TN") mode, a display panel in a horizontal orientation mode, a display panel in a super vertical orientation ("SVA") mode, a display panel in a super patterned vertical orientation ("S-PVA") mode, a display panel in an optically compensated bend ("OCB") mode, or a display panel in an electrically controlled birefringence ("ECB") mode. In addition, the liquid crystal display panel DP may be driven by a driving method different from the above-mentioned driving method, and may include liquid crystals oriented by an orientation method different from the above-mentioned orientation method.

[0111] The liquid crystal display panel DP may include polarization layers POL-T and POL-B. Figure 3 A lower polarizing layer POL-B disposed under a first substrate SUB1 as a lower substrate of the liquid crystal display panel DP and an upper polarizing layer POL-T disposed on a second substrate SUB2 as an upper substrate of the liquid crystal display panel DP are shown.

[0112] The polarization layers POL-T and POL-B may include a linear polarizer. The linear polarizer may linearly polarize light provided to the linear polarizer in one direction. The linear polarizer may be a film-type polarizer including a stretched polymer film. In an exemplary embodiment, the stretched polymer film may be, for example, a stretched polyvinyl alcohol-based film. In addition, the linear polarizer may be a coating-type polarizing layer.

[0113] In addition, unlike what is shown in the drawings, the polarization layers POL-T and POL-B may be in-cell polarization layers independently disposed between the first substrate SUB1 and the liquid crystal layer LCL or between the second substrate SUB2 and the liquid crystal layer LCL.

[0114] In an exemplary embodiment, the lower polarizing layer POL-B may be, for example, a coating type polarizing layer or a polarizing layer provided by a deposition process. The lower polarizing layer POL-B may be provided by coating a material including a dichroic dye and a liquid crystal compound. As another approach, the lower polarizing layer POL-B may be a wire grid type polarizing layer. The lower polarizing layer POL-B may be arranged in a film type below the first substrate SUB1. In this case, an adhesive layer may be further arranged between the lower polarizing layer POL-B and the first substrate SUB1.

[0115] In addition, the upper polarizing layer POL-T may be a coating type polarizing layer or a polarizing layer provided by a deposition process.

[0116] The transmission axis of the linear polarizer included in the upper polarizing layer POL-T disposed on the second substrate SUB2 and the transmission axis of the linear polarizer included in the lower polarizing layer POL-B may be substantially perpendicular to each other, however, the present invention should not be limited thereto or thereby.

[0117] The polarization layers POL-T and POL-B may further include a phase retardation layer and an optical compensation layer. The phase retardation layer and the optical compensation layer may be arranged on the upper surface or the lower surface of the linear polarizer, and as an example, an adhesive layer may be further arranged between the linear polarizer and the phase retardation layer or between the linear polarizer and the optical compensation layer.

[0118] In an exemplary embodiment, the optical member OU may be disposed on the liquid crystal display panel DP in the display device DD. The optical member OU may include an optical film OF and a base film BS.

[0119] The optical film OF may be disposed on the liquid crystal display panel DP. In an exemplary embodiment, the optical film OF may be disposed on the upper polarizing layer POL-T. In addition, an adhesive layer AD may be disposed between the upper polarizing layer POL-T and the optical film OF.

[0120] The base film BS may be disposed on the optical film OF. The base film BS may be used as a support for supporting the optical film OF or a protective layer for protecting the optical film OF. For example, in an exemplary embodiment, a polyethylene terephthalate ("PET") film may be used as the base film BS.

[0121] refer to Figures 5 to 7C , the optical film OF may include a first pattern layer RP1 and a second pattern layer RP2. The second pattern layer RP2 may be disposed on the first pattern layer RP1.

[0122] The first pattern layer RP1 and the second pattern layer RP2 may have different refractive indices from each other. For example, in an exemplary embodiment, the refractive index difference between the first pattern layer RP1 and the second pattern layer RP2 may be in a range of equal to or greater than about 0.2 and equal to or less than about 0.25.

[0123] According to the optical film OF of the exemplary embodiment, the first refractive index of the first pattern layer RP1 may be less than the second refractive index of the second pattern layer RP2. The first refractive index of the first pattern layer RP1 may be in the range from about 1.0 to about 1.5, and the second refractive index of the second pattern layer RP2 may be in the range from about 1.2 to about 1.7. For example, in the exemplary embodiment, the second refractive index of the second pattern layer RP2 may be equal to or less than about 1.6, the first refractive index of the first pattern layer RP1 may be equal to or less than about 1.4, and the second refractive index of the second pattern layer RP2 may be greater than the first refractive index of the first pattern layer RP1 by about 0.2 to about 0.25.

[0124] According to the optical film OF of the exemplary embodiment, the first pattern layer RP1 may include a first base portion BL1 and a plurality of first protruding portions EP1. The first protruding portions EP1 may be disposed and arranged on the first base portion BL1. In addition, the second pattern layer RP2 may be disposed on the first pattern layer RP1, and the second pattern layer RP2 may be filled between the first protruding portions EP1.

[0125] According to the optical film OF of the exemplary embodiment, the second pattern layer RP2 may include a second base portion BL2 and a plurality of second protruding portions EP2. According to the optical film OF of the exemplary embodiment, the second protruding portions EP2 may be disposed and arranged under the second base portion BL2. According to the optical film OF of the exemplary embodiment, the first protruding portions EP1 may be disposed alternately with the second protruding portions EP2.

[0126] In an exemplary embodiment, each of the first and second protrusion portions EP1 and EP2 may have a stripe shape extending in one direction. Each of the first and second protrusion portions EP1 and EP2 may be disposed in a stripe pattern on a flat surface defined by the first and second direction axes DR1 and DR2.

[0127] refer to Figure 5 , each of the first protruding portion EP1 and the second protruding portion EP2 may extend on the second direction axis DR2. Figures 1 to 5, the extension direction of the first protruding portion EP1 and the second protruding portion EP2 of the optical film OF may be substantially parallel to the up-down direction in the viewing direction of the display surface IS of the electronic device ED. That is, the extension direction of the first protruding portion EP1 and the second protruding portion EP2 of the optical film OF may be substantially parallel to the up-down direction in the viewing direction of the display surface IS of the electronic device ED. Figure 1 and Figure 2 The direction of the short side of the display device DD shown in .

[0128] exist Figure 1 In the embodiment, the left-right direction of the display surface IS of the electronic device ED is the long side direction, and the up-down direction of the display surface IS of the electronic device ED is the short side direction, however, the present invention should not be limited to or restricted by this. Different from what is shown in the drawings, in other exemplary embodiments, in the direction in which the user views the electronic device ED, the left-right direction of the display surface IS of the electronic device ED may be the short side direction, and the up-down direction of the display surface IS of the electronic device ED may be the long side direction. In this case, the extension direction of the first protruding portion EP1 and the second protruding portion EP2 of the optical film OF may be substantially parallel to the long side of the display device DD.

[0129] According to the optical film OF of the exemplary embodiment, each of the first protrusion portions EP1 may include a first sub-protrusion portion EP-S1, a second sub-protrusion portion EP-S2 disposed between the first base portion BL1 and the first sub-protrusion portion EP-S1, and a third sub-protrusion portion EP-S3 disposed on the first sub-protrusion portion EP-S1.

[0130] The first sub-protrusion portion EP-S1 may have a first width W in a cross section perpendicular to the first base portion BL1. 1 The first sub-protruding portion EP-S1 may include a first sub-bottom surface DS-S1 adjacent to the second sub-protruding portion EP-S2, a first sub-upper surface US-S1 facing the first sub-bottom surface DS-S1, and a first sub-side surface SS-S1 connecting the first sub-bottom surface DS-S1 and the first sub-upper surface US-S1.

[0131] The second sub-protrusion portion EP-S2 may have a width gradually increasing from the first sub-protrusion portion EP-S1 toward the first base portion BL1. The second sub-protrusion portion EP-S2 may include a second sub-bottom surface DS-S2 adjacent to the first base portion BL1, a second sub-upper surface US-S2 facing the second sub-bottom surface DS-S2, and a second sub-side surface SS-S2 connecting the second sub-bottom surface DS-S2 and the second sub-upper surface US-S2. The second sub-bottom surface DS-S2 and the second sub-upper surface US-S2 may be referred to as the "lower surface" and "upper surface" of the second sub-protrusion portion EP-S2, respectively.

[0132] The third sub-protrusion EP-S3 may be arranged on the first sub-protrusion EP-S1, and may have a width that gradually decreases as the distance from the first sub-protrusion EP-S1 increases. The third sub-protrusion EP-S3 may include a third sub-bottom surface DS-S3 adjacent to the first sub-protrusion EP-S1, a third sub-upper surface US-S3 facing the third sub-bottom surface DS-S3, and a third sub-side surface SS-S3 connecting the third sub-bottom surface DS-S3 and the third sub-upper surface US-S3. The third sub-bottom surface DS-S3 and the third sub-upper surface US-S3 may be referred to as the "lower surface" and "upper surface" of the third sub-protrusion EP-S3, respectively.

[0133] In the first protruding portion EP1, the distance between the first sub-side surfaces SS-S1 facing each other in the cross section of the first sub-protruding portion EP-S1 perpendicular to the first base portion BL1 may be uniform. That is, in the cross section perpendicular to the first base portion BL1, the width W of the first sub-protruding portion EP-S1 is 1 However, the present invention should not be limited thereto or thereby, and in another exemplary embodiment, the width W of the first sub-protrusion portion EP-S1 is 1 The first sub-surface US-S1 may gradually increase to the first sub-bottom surface DS-S1.

[0134] refer to Figures 6 to 7C , the first sub-protrusion portion EP-S1 may have a rectangular shape in a cross section substantially parallel to a flat surface defined by the first direction axis DR1 and the third direction axis DR3. In an exemplary embodiment, the first sub-side surface SS-S1 may be substantially perpendicular to the first sub-bottom surface DS-S1 and the first sub-upper surface US-S1 of the first sub-protrusion portion EP-S1. When viewed in the cross section, the first sub-side surface SS-S1 may have an inclination angle θ of approximately 90 degrees relative to the first sub-bottom surface DS-S1. S1 .

[0135] The inclination angle θ of the first sub-side surface SS-S1 relative to the first sub-bottom surface DS-S1 S1 It may be substantially close to 90 degrees, however, the present invention should not be limited thereto or thereby. That is, the inclination angle θ of the first sub-side surface SS-S1 relative to the first sub-bottom surface DS-S1 is S1 It may be in the range of from about 86 degrees to about 90 degrees.

[0136] In a cross section of the first protruding portion EP1 perpendicular to the first base portion BL1, a distance W between the first protruding portions EP1 adjacent to each other is P1 and the width W of the first sub-protrusion EP-S1 1There may be a relationship represented by the following Equation 1.

[0137] Equation 1

[0138] 0.15≤W 1 / W P1 ≤0.45

[0139] In Equation 1, by substituting the width W of the first sub-protrusion portion EP-S1 1 The minimum distance W between the first sub-protrusions EP-S1 in the first protrusions EP1 adjacent to each other 2 Add to obtain the spacing W between the first protruding parts EP1 P1 In addition, W 1 and W 2 Corresponds to the distance in the direction perpendicular to the extending direction of the first protruding portion EP1. Figure 6 , the distance W between the first protruding parts EP1 P1 and the width W of each of the first sub-protrusion portions EP-S1 1 A distance in a direction substantially parallel to the first direction axis DR1 may be indicated.

[0140] In an exemplary embodiment, the width W of each of the first sub-protrusion portions EP-S1 is 1 It may be, for example, in the range of about 3 micrometers to about 5 micrometers. In addition, the interval W between the first protruding portions EP1 is P1 It may be in the range of, for example, from about 12 microns to about 16 microns.

[0141] In a cross section of the first protruding portion EP1 perpendicular to the first base portion BL1, a distance W between the first protruding portions EP1 adjacent to each other is P1 and the height H of the first protruding portion EP1 1 There may be a relationship represented by the following Equation 2.

[0142] Equation 2

[0143] 0.75≤H 1 / W P1 ≤1.35

[0144] In Equation 2, as described in Equation 1, by substituting the width W of each of the first sub-protruding portions EP-S1 into 1 The minimum distance W between the first sub-protrusions EP-S1 adjacent to each other 2 Add to get the spacing W P1 , and W 1 and W 2The height H of the first protruding portion EP1 corresponds to the distance in the direction perpendicular to the extending direction of the first protruding portion EP1. 1 Corresponds to the height in the third directional axis DR3 which is the thickness direction of the optical film OF.

[0145] For example, in an exemplary embodiment, the interval W between the first protruding portions EP1 is P1 The height H of the first protruding portion EP1 may be in the range of about 12 μm to about 16 μm. 1 It may be in the range of from about 12 microns to about 16 microns.

[0146] refer to Figure 5 The first pattern layer RP1 may include first protrusion portions EP1, and first concave portions CP1 may be defined between the first protrusion portions EP1 adjacent to each other. The second pattern layer RP2 may include second protrusion portions EP2, and second concave portions CP2 may be defined between the second protrusion portions EP2.

[0147] The groove defined by the first protruding portion EP1 and the first recessed portion CP1 of the first pattern layer RP1 may correspond to the groove defined by the second recessed portion CP2 and the second protruding portion EP2 of the second pattern layer RP2. For example, in an exemplary embodiment, the first protruding portion EP1 of the first pattern layer RP1 may be arranged to correspond to the second recessed portion CP2 of the second pattern layer RP2, and the second protruding portion EP2 of the second pattern layer RP2 may be arranged to correspond to the first recessed portion CP1 of the first pattern layer RP1. That is, the first protruding portion EP1 may be inserted into the second recessed portion CP2, and the second protruding portion EP2 may be inserted into the first recessed portion CP1.

[0148] In reference Figures 5 to 7C In the described exemplary embodiment of the optical film OF, the first sub-side surface SS-S1 of the first sub-protrusion portion EP-S1 is perpendicular to the first sub-bottom surface DS-S1, and the first protrusion portion EP1 may satisfy the relationship represented by Equations 1 and 2.

[0149] In an exemplary embodiment of the optical film OF, the first sub-protrusion portion EP-S1 may have a rectangular shape in a cross section perpendicular to the first base portion BL1, and each of the second and third sub-protrusion portions EP-S2 and EP-S3 may have a trapezoidal shape in a cross section perpendicular to the first base portion BL1.

[0150] refer to Figure 7B and Figure 7C, in a cross section substantially parallel to a flat surface defined by the first direction axis DR1 and the third direction axis DR3, the first sub-protrusion portion EP-S1 may have a rectangular shape, and the second sub-protrusion portion EP-S2 disposed adjacent to the first sub-bottom surface DS-S1 of the first sub-protrusion portion EP-S1 may have a trapezoidal shape whose width gradually increases from the first sub-bottom surface DS-S1 to the first base portion BL1. In addition, the third sub-protrusion portion EP-S3 disposed adjacent to the first sub-upper surface US-S1 of the first sub-protrusion portion EP-S1 may have a trapezoidal shape whose width gradually decreases as the distance from the first sub-upper surface US-S1 increases.

[0151] That is, the optical film OF in the exemplary embodiment may include a first sub-protrusion portion EP-S1 having a rectangular shape in cross section, and may include a side surface protrusion portion EP-AD in an area adjacent to the lower surface, and a chamfered portion EP-OP may be defined in an area adjacent to the upper surface.

[0152] According to the optical film OF of the exemplary embodiment, the second sub-protrusion portion EP-S2 may have a trapezoidal shape, and the second sub-side surface SS-S2 may have an inclination angle θ in a range from about 69 degrees to about 83 degrees with respect to the second sub-bottom surface DS-S2 of the second sub-protrusion portion EP-S2. S2 .

[0153] In addition, in an exemplary embodiment, the width W of the second sub-bottom surface DS-S2 of the second sub-protruding portion EP-S2 of the optical film OF is B2 It can be larger than the width W of the second sub-upper surface US-S2 C2 The width W of the second sub-bottom surface DS-S2 is B2 The width W of the second upper sub-surface US-S2 can be C2 The width W of the protruding portion EP-AD on the side surface A1 and W A2 The width W of the second sub-surface US-S2 is obtained by adding C2 The maximum width W of the second sub-bottom surface DS-S2 may be equal to the width of the first sub-bottom surface DS-S1 of the first sub-protruding portion EP-S1. B2 and the maximum width W of the second upper sub-surface US-S2 C2 The following equation 3 may be satisfied.

[0154] Equation 3

[0155] 0.67≤W C2 / W B2 ≤0.91

[0156] The maximum width W of the second sub-bottom surface DS-S2 B2 and the maximum width W of the second upper sub-surface US-S2 C2 Corresponding to the width in the direction corresponding to the first direction axis DR1.

[0157] In an exemplary embodiment, the width W of the side surface protruding portion EP-AD is A1 and W A2 Each of the widths W of the second sub-surface US-S2 may be, for example, in the range from about 0.25 micrometers to about 0.75 micrometers. C2 It may be in the range of, for example, from about 3 microns to about 5 microns.

[0158] In addition, the cross-section of the first protrusion portion EP1 of the optical film OF may have a shape satisfying Equation 4 below.

[0159] Equation 4

[0160] 0.06≤H S2 / H 1 ≤0.17

[0161] In Equation 4, H 1 H represents the maximum height of the first protruding portion EP1 in the thickness direction in a cross section of the first protruding portion EP1 perpendicular to the first base portion BL1, and H S2 The maximum height H of the second sub-protrusion portion EP-S2 in the thickness direction in the cross section. 1 and the maximum height H of the second sub-protrusion EP-S2 in the thickness direction S2 Corresponds to the height in the direction corresponding to the third directional axis DR3.

[0162] The height H of the second sub-protrusion portion EP-S2 in the thickness direction S2 It may be, for example, in the range of about 1 micrometer to about 2 micrometers. In addition, the maximum height H of the first protruding portion EP1 in the thickness direction is 1 It may be in the range of, for example, from about 12 microns to about 16 microns.

[0163] According to the optical film OF of the exemplary embodiment, the third sub-protrusion portion EP-S3 may have a trapezoidal shape, and the third sub-side surface SS-S3 may have an inclination angle θ in a range from about 69 degrees to about 83 degrees with respect to the third sub-bottom surface DS-S3 of the third sub-protrusion portion EP-S3. S3 .

[0164] In addition, in an exemplary embodiment, the width W of the third sub-bottom surface DS-S3 of the third sub-protruding portion EP-S3 of the optical film OF is B3 Can be larger than the width W of the third sub-upper surface US-S3 C3 The width W of the third sub-bottom surface DS-S3 is B3 The width W of the third sub-surface US-S3 can be C3 Width W of chamfered portion EP-OP O1 and W O2 The width W of the third sub-bottom surface DS-S3 is obtained by adding B3 The maximum width W of the third sub-bottom surface DS-S3 may be equal to the width of the first sub-upper surface US-S1 of the first sub-protruding portion EP-S1. B3 and the maximum width W of the third sub-surface US-S3 C3 The following equation 5 may be satisfied.

[0165] Equation 5

[0166] 0.67≤W C3 / W B3 ≤0.90

[0167] The maximum width W of the third sub-bottom surface DS-S3 B3 and the maximum width W of the third sub-surface US-S3 C3 Corresponding to the width in the direction corresponding to the first direction axis DR1.

[0168] The width W of the chamfered portion EP-OP removed from the upper end of the first protruding portion EP1 O1 and W O2 Each of the widths W of the third sub-bottom surface DS-S3 may be, for example, in the range from about 0.25 micrometers to about 0.5 micrometers. B3 It may be in the range of, for example, from about 3 microns to about 5 microns.

[0169] In addition, the cross-section of the first protrusion portion EP1 of the optical film OF may have a shape satisfying Equation 6 below.

[0170] Equation 6

[0171] 0.06≤H S3 / H 1 ≤0.17

[0172] In Equation 6, H 1 H represents the maximum height of the first protruding portion EP1 in the thickness direction in a cross section of the first protruding portion EP1 perpendicular to the first base portion BL1, and H S3The maximum height H of the third sub-protrusion portion EP-S3 in the thickness direction in the cross section. 1 and the maximum height H of the third sub-protrusion EP-S3 in the thickness direction S3 Corresponds to the height in the direction corresponding to the third directional axis DR3.

[0173] The height H of the third sub-protrusion portion EP-S3 in the thickness direction S3 It may be, for example, in the range of about 1 micrometer to about 2 micrometers. In addition, the maximum height H of the first protruding portion EP1 in the thickness direction is 1 It may be in the range of, for example, from about 12 microns to about 16 microns.

[0174] When the optical film includes a first pattern layer including first protruding portions and a second pattern layer having a refractive index higher than that of the first pattern layer, and each of the first protruding portions satisfies the relationship expressed by Equations 1 to 6, the optical film can be used to improve the front and side viewing angle characteristics of a display device.

[0175] The shape of the optical film OF should not be limited to the reference Figures 5 to 7C Exemplary embodiments described. For example, in an exemplary embodiment, the first protrusion EP1 of the optical film OF may further include at least one additional sub-protrusion arranged between the first sub-protrusion EP-S1 and the second sub-protrusion EP-S2 and / or arranged between the second sub-protrusion EP-S2 and the first base portion BL1. The additional sub-protrusion may have a trapezoidal shape or a rectangular shape in its cross section. In the case where the additional sub-protrusion has a trapezoidal shape in its cross section, the inclination angle of the side surface of the trapezoidal shape and the inclination angle of the second sub-side surface SS-S2 of the second sub-protrusion EP-S2 may be different from each other.

[0176] In addition, in an exemplary embodiment, the first protrusion portion EP1 of the optical film OF may further include at least one additional sub-protrusion portion arranged between the first sub-protrusion portion EP-S1 and the third sub-protrusion portion EP-S3 and / or arranged between the third sub-protrusion portion EP-S3 and the second base portion BL2. The additional sub-protrusion portion may have a trapezoidal shape or a rectangular shape in its cross section. In the case where the additional sub-protrusion portion has a trapezoidal shape in its cross section, the inclination angle of the side surface of the trapezoidal shape and the inclination angle of the third sub-side surface SS-S3 of the third sub-protrusion portion EP-S3 may be different from each other.

[0177] refer to Figure 6The optical film OF includes a second pattern layer RP2 disposed on the first pattern layer RP1. The second pattern layer RP2 may include a second width W in a cross section perpendicular to the second base portion BL2. 2 a fourth sub protrusion portion EP-S4 disposed between the fourth sub protrusion portion EP-S4 and the second base portion BL2, and a sixth sub protrusion portion EP-S6 disposed between the first base portion BL1 and the fourth sub protrusion portion EP-S4.

[0178] The fifth sub-protrusion portion EP-S5 may have a width gradually increasing from the fourth sub-protrusion portion EP-S4 to the second base portion BL2. The sixth sub-protrusion portion EP-S6 may be disposed between the fourth sub-protrusion portion EP-S4 and the first base portion BL1, and may have a width gradually decreasing as the distance from the fourth sub-protrusion portion EP-S4 increases.

[0179] The fourth sub-protrusion portion EP-S4 of the optical film OF may have a rectangular shape in a section perpendicular to the second base portion BL2, and each of the fifth and sixth sub-protrusion portions EP-S5 and EP-S6 may have a trapezoidal shape in a section perpendicular to the second base portion BL2.

[0180] In the second protruding portion EP2, in a cross section of the fourth sub-protruding portion EP-S4 perpendicular to the second base portion BL2, the distance between the side surfaces facing each other may be uniform. That is, in a cross section perpendicular to the second base portion BL2, the width W of the fourth sub-protruding portion EP-S4 is 2 Can be uniform.

[0181] exist Figure 6 In the exemplary embodiment shown in , the second pattern layer RP2 may have a refractive index greater than that of the first pattern layer RP1. In addition, the width W of the first sub-protrusion portion EP-S1 of the first pattern layer RP1 having a relatively small refractive index is 1 may be smaller than the width W of the fourth sub-protrusion portion EP-S4 of the second pattern layer RP2. 2 In an exemplary embodiment, the width W of the fourth sub-protrusion portion EP-S4 of the second pattern layer RP2 is 2 may correspond to a minimum interval between the first sub-protrusion portions EP-S1 adjacent to each other.

[0182] Figure 8 is an exploded perspective view showing an exemplary embodiment of an optical film according to the present invention, and Fig. 9 and Fig.10 1 is a perspective view showing an exemplary embodiment of a portion of an optical film according to the present invention. Figures 8 to 10The optical film OF-a described may be included in the reference Figures 1 to 3 In the display device DD described. In the following, Figures 8 to 10 The optical film OF-a shown in FIG. Figures 5 to 7C The same descriptions of those described will be omitted, and thus different features will be mainly described.

[0183] refer to Figure 8 , the optical film OF-a in the exemplary embodiment may include a first pattern layer RP1-a and a second pattern layer RP2-a disposed on the first pattern layer RP1-a. Fig. 9 The first pattern layer RP1-a may include a first base portion BL1-a and a plurality of first protruding portions EP1-a. In addition, each of the first protruding portions EP1-a of the first pattern layer RP1-a may have a height H in a direction corresponding to the third directional axis DR3 as a thickness direction. 1-a Column shape.

[0184] The first protrusion portion EP1-a may include a first sub-protrusion portion EP-S1a having a square pillar shape, a second sub-protrusion portion EP-S2a disposed between the first base portion BL1-a and the first sub-protrusion portion EP-S1a, and a third sub-protrusion portion EP-S3a disposed on the first sub-protrusion portion EP-S1a.

[0185] The second sub-protrusion EP-S2a may have a truncated quadrangular pyramid shape, in which the area of ​​the bottom surface adjacent to the first base portion BL1-a is larger than the area of ​​the upper surface adjacent to the first sub-protrusion EP-S1a. In addition, the third sub-protrusion EP-S3a may have a truncated quadrangular pyramid shape, in which the area of ​​the bottom surface adjacent to the first sub-protrusion EP-S1a is larger than the area of ​​the upper surface spaced apart from the first sub-protrusion EP-S1a.

[0186] refer to Fig.10 , the second pattern layer RP2-a may include a plurality of cavities HP defined in one surface DS2-a. The first protruding portion EP1-a of the first pattern layer RP1-a may be arranged to correspond to the cavity HP of the second pattern layer RP2-a in a one-to-one correspondence. The first protruding portion EP1-a of the first pattern layer RP1-a may be arranged to fill the cavity HP of the second pattern layer RP2-a.

[0187] exist Figures 8 to 10 In the exemplary embodiment of the optical film OF-a shown in , the first pattern layer RP1-a may have a refractive index smaller than that of the second pattern layer RP2-a. In an exemplary embodiment, the refractive index difference between the first pattern layer RP1-a and the second pattern layer RP2-a may be, for example, equal to or greater than about 0.2.

[0188] The first protrusion portions EP1-a may be arranged in a row in a direction corresponding to the second direction axis DR2. A spacing W in the direction corresponding to the first direction axis DR1 between the first protrusion portions EP1-a arranged in the first row L1 and the first protrusion portions EP1-a arranged in the second row L2 adjacent to the first row L1 is P1-a The width W of the first sub-protrusion portion EP-S1a of each first protrusion portion EP1-a in the direction corresponding to the first direction axis DR1 may be, for example, in the range from about 12 micrometers to about 16 micrometers. 1-a It may be in the range of, for example, from about 3 microns to about 5 microns.

[0189] In a cross section of the first protruding portion EP1 - a perpendicular to the first base portion BL1 - a, a distance W between the first protruding portions EP1 - a adjacent to each other is P1-a and the width W of each first sub-protrusion EP-S1a 1-a There may be a relationship represented by the following equation 1-a.

[0190] Equation 1-a

[0191] 0.15≤W 1-a / W P1-a ≤0.45

[0192] In Equation 1-a, the interval W between the first protruding portions EP1-a is P1-a By setting the width W of each first sub-protrusion EP-S1a 1-a The minimum interval W between the rows in which the first protruding portions EP1-a are arranged in the direction corresponding to the second direction axis DR2 2-a Add to get. Fig. 9 , the distance W between the first protruding parts EP1-a adjacent to each other P1-a The distance between the first protrusion portions EP1-a disposed in the lines L1 and L2 adjacent to each other may be φ(L). The lines L1 and L2 are virtual lines in which the first protrusion portions EP1-a are aligned in the direction of the second direction axis DR2.

[0193] When viewed in a cross section perpendicular to the first base portion BL1-a, a distance W between the first protrusion portion EP1-a disposed in the first line L1 and the first protrusion portion EP1-a disposed in the second line L2 in a direction corresponding to the first direction axis DR1 is P1-a and the height H of each first protruding portion EP1-a 1-a There may be a relationship represented by the following equation 2-a.

[0194] Equation 2-a

[0195] 0.75≤H 1-a / W P1-a ≤1.35

[0196] As expressed by the above equation 1-a, in equation 2-a, the spacing W P1-a By setting the width W of each first sub-protrusion EP-S1a 1-a The minimum interval W between the rows in which the first protruding portions EP1-a are arranged in the direction corresponding to the second direction axis DR2 2-a In addition, the height H of the first protruding portion EP1-a is 1-a The height H of the first protruding portion EP1-a corresponds to the height in the direction corresponding to the third directional axis DR3 which is the thickness direction of the optical film OF-a. 1-a It may be in the range of, for example, from about 12 microns to about 16 microns.

[0197] The description about the relationship between the width and height of the first sub-protrusion EP-S1, the second sub-protrusion EP-S2 and the third sub-protrusion EP-S3 can also be applied to the relationship between the width and height of the first sub-protrusion EP-S1a, the second sub-protrusion EP-S2a and the third sub-protrusion EP-S3a.

[0198] In reference Figures 8 to 10 The optical film OF-a described is included in the reference Figures 1 to 3 In the case of the display device DD described, the display device DD can have improved front brightness characteristics and excellent viewing angle characteristics, and the display device DD includes reference Figures 5 to 7C The same is true for the described optical film OF.

[0199] The display device in this exemplary embodiment may include a liquid crystal display panel and an optical film disposed on the liquid crystal display panel.

[0200] Figure 3 A cross-sectional view of an exemplary embodiment of a display device DD is shown, and the display device DD may include reference Figures 5 to 10 The optical films OF and OF-a described herein. That is, referring to Figures 5 to 10 The description described may be equally applied to the optical film OF included in the display device DD in this exemplary embodiment.

[0201] exist Figure 3 In the display device DD shown in FIG. 1 , the first pattern layer RP1 of the optical film OF may be arranged closer to the liquid crystal display panel DP than the second pattern layer RP2. The refractive index of the first pattern layer RP1 may be smaller than the refractive index of the second pattern layer RP2.

[0202] In an exemplary embodiment, in the Figure 3 In the optical film OF in the display device DD shown in , the refractive index of the first pattern layer RP1 may be smaller than the refractive index of the second pattern layer RP2, and the refractive index difference between the second pattern layer RP2 and the first pattern layer RP1 may be equal to or greater than, for example, 0.2. The refractive index of the first pattern layer RP1 may be in the range from about 1.0 to about 1.5, and the refractive index of the second pattern layer RP2 may be in the range from about 1.2 to about 1.7. For example, in an exemplary embodiment, the refractive index of the second pattern layer RP2 may be equal to or less than about 1.6, the refractive index of the first pattern layer RP1 may be equal to or less than about 1.4, and the refractive index of the second pattern layer RP2 may be greater than the refractive index of the first pattern layer RP1 by about 0.2 or more.

[0203] The display device DD including the optical film OF in the exemplary embodiment can show excellent visibility. That is, because the emission amount of white light in the front direction increases, the contrast ratio increases, and the gamma distortion index ("GDI") value in the side viewing angle direction at an angle of about 60 degrees is also improved, the display device DD including the optical film OF in the exemplary embodiment can have excellent display quality.

[0204] Table 1

[0205] Comparison Examples Example of embodiment White light brightness 300 353 Contrast 4459 5810 60 degree GDI 0.270 0.150

[0206] Table 1 shows the Figure 3 The exemplary embodiment of the structure of the display device DD in the exemplary embodiment shown in FIG. Figures 5 to 7C The display quality characteristics in the embodiment example of the optical film in the exemplary embodiment described and the display quality characteristics in the comparative example in which the first protruding portion of the optical film has a trapezoidal shape. In the case of the comparative example, the cross section of the first protruding portion of the optical film has a trapezoidal shape, and the side surface of the first protruding portion of the optical film has an inclination angle of about 80 degrees relative to the bottom surface of the optical film. Table 1 shows the results obtained by comparing the white light brightness, contrast, and GDI values ​​in the front direction of the comparative example with the white light brightness, contrast, and GDI values ​​of the embodiment example under the same conditions except that the optical films have shapes different from each other.

[0207] Referring to the results in Table 1, the white light brightness in the front direction of the embodiment example is increased and the GDI value is improved compared with the comparative example. In addition, the contrast is maintained at a level similar to that of the comparative example. That is, in the display device including the reference Figures 5 to 7CIn the case of the optical film of the described structure, the display quality in the front direction and the side direction in the embodiment example is improved compared with the comparative example.

[0208] Table 2 shows the Figure 3 In the display device DD in the exemplary embodiment shown in FIG. 1 , the first sub-protrusion portion EP-S1 has a width W of about 4 μm. 1 and the interval W between the first protruding portions EP1 adjacent to each other is P1 When the value is about 12 microns, the GDI value and the contrast are compared according to the changes in the width and height of the second sub-protrusion portion EP-S2 and the third sub-protrusion portion EP-S3 and the changes in the inclination angle of the side surfaces of the second sub-protrusion portion EP-S2 and the third sub-protrusion portion EP-S3 in the cross section.

[0209] Table 2 shows the GDI value and the contrast ratio at the height H in the cross section of the side surface protruding portion EP-AD arranged at one side of the second sub-protruding portion EP-S2. S2 , Width W A2 and the tilt angle θ S2 and the height H in the cross section of the chamfered portion EP-OP defined in one side of the third sub-protruding portion EP-S3. S3 , Width W O2 and the tilt angle θ S3 In the exemplary embodiment shown in Table 2, the refractive index difference between the first pattern layer and the second pattern layer is about 0.23.

[0210] Table 2

[0211]

[0212] Referring to the results of Table 2, the side surface protrusion portion EP-AD of the second sub-protrusion portion EP-S2 has a height H ranging from about 1 μm to about 2 μm. S2 and a width W from about 0.25 micrometers to about 0.75 micrometers A2 And the second sub-side surface SS-S2 has an inclination angle θ from about 69 degrees to about 83 degrees. S2 The chamfered portion EP-OP of the third sub-protrusion portion EP-S3 has a height H ranging from about 1 μm to about 2 μm. S3 and a width W from about 0.25 micrometers to about 0.50 micrometers O2 And the third sub-side surface SS-S3 has an inclination angle θ from about 76 degrees to about 83 degrees. S3 In the combination of the cases of , the GDI value is expressed as a low value of about 0.15. That is, the optical film in the exemplary embodiment can be used to improve the side viewing angle characteristics of the display device.

[0213] The front CR values ​​shown in Table 2 are adjusted by a combination of the shape of the side surface protruding portion EP-AD of the second sub-protruding portion EP-S2 and the shape of the chamfered portion EP-OP of the third sub-protruding portion EP-S3. For example, in an exemplary embodiment, the height H of the side surface protruding portion EP-AD in the cross section is S2 , Width W A2 and the side surface inclination angle θ S2 The height H of the chamfered portion EP-OP in the cross section is respectively from about 1 micrometer to about 2 micrometers, about 0.25 micrometers, and from about 76 degrees to about 83 degrees. S3 , Width W O2 and the side surface inclination angle θ S3 Excellent front contrast ratio was obtained in the combination of about 2 micrometers, about 0.25 micrometers, and about 83 degrees, respectively.

[0214] When the optical film includes a pattern layer including first protrusions, the width W of each first sub-protrusion is 1 The distance W between the adjacent first protrusions P1 The ratio of H is in the range of about 0.15 to about 0.45, and the height H of each first protrusion is 1 The distance W between the adjacent first protrusions P1 When the ratio is in the range from about 0.75 to about 1.35, excellent visibility of the display device is obtained. In addition, by the optical film including the sub-protrusion portion satisfying the above-mentioned equations 3 to 6, excellent visibility is exhibited in a side viewing angle.

[0215] Fig.11 is a cross-sectional view showing an exemplary embodiment of a display device DD-1 according to the present invention. Fig. 12A and Fig. 12B It is shown that the Fig.11 sectional view of an exemplary embodiment of an optical film OF-1 in a display device DD-1. Fig. 12A shows a cross section of the optical film OF-1 in a plane defined by the first direction axis DR1 and the third direction axis DR3, and Fig. 12B A cross section of the second pattern layer RP2 - 1 in a plane defined by the first direction axis DR1 and the fourth direction axis DR4 is shown.

[0216] In the following, Fig.11 , Fig. 12A and Fig. 12B The display device DD-1 and the optical film OF-1 shown in the reference Figures 1 to 10 The descriptions of those that are described the same will be omitted, and thus different features will be mainly described.

[0217] Fig.11 The display device DD-1 of the exemplary embodiment shown in FIG. Figure 3 The display device DD of the exemplary embodiment shown in FIG. 1 is different in the combination of the first pattern layer RP1 - 1 and the second pattern layer RP2 - 1 in the optical film OF- 1 of the optical member OU- 1 .

[0218] In an exemplary embodiment of the optical film OF-1, the second pattern layer RP2-1 may be arranged on the first pattern layer RP1-1, and the first pattern layer RP1-1 may have a refractive index greater than that of the second pattern layer RP2-1. That is, the display device DD-1 may include the optical film OF-1 in which the pattern layer having a relatively large refractive index is arranged adjacent to the liquid crystal display panel DP.

[0219] In an exemplary embodiment, in the Fig.11 In the optical film OF-1 in the display device DD-1 shown in , the refractive index of the first pattern layer RP1-1 is greater than the refractive index of the second pattern layer RP2-1, and the refractive index difference between the first pattern layer RP1-1 and the second pattern layer RP2-1 may be, for example, equal to or greater than, for example, about 0.2. The refractive index of the first pattern layer RP1-1 may be in the range from about 1.2 to about 1.7, and the refractive index of the second pattern layer RP2-1 may be in the range from about 1.0 to about 1.5. For example, in an exemplary embodiment, the refractive index of the first pattern layer RP1-1 may be equal to or less than about 1.6, the refractive index of the second pattern layer RP2-1 may be equal to or less than about 1.4, and the refractive index of the first pattern layer RP1-1 may be greater than the refractive index of the second pattern layer RP2-1 by a range from about 0.2 to about 0.25.

[0220] In an exemplary embodiment, the first protrusion portion EP1-1 included in the first pattern layer RP1-1 may include a first sub-protrusion portion EP-S11, a second sub-protrusion portion EP-S21, and a third sub-protrusion portion EP-S31, and the second protrusion portion EP2-1 included in the second pattern layer RP2-1 may include a fourth sub-protrusion portion EP-S41, a fifth sub-protrusion portion EP-S51, and a sixth sub-protrusion portion EP-S61.

[0221] Included in Fig.11 In the optical film OF-1 in the display device DD-1 shown in FIG. 1 , in a cross section perpendicular to the second base portion BL2-1, the interval W between the second protruding portions EP2-1 adjacent to each other is P2 and the width W of the fourth sub-protrusion EP-S41 2-1 It may have a relationship represented by the following equation 1-1.

[0222] Equation 1-1

[0223] 0.15≤W 2-1 / W P2 ≤0.45

[0224] In Equation 1-1, by substituting the width W of the fourth sub-protrusion portion EP-S41 2-1 The minimum distance W between the fourth sub-protrusion portion EP-S41 and the second protrusion portion EP2-1 adjacent to each other 1-1 Add to get the spacing W P2 , and W 1-1 and W 2-1 Corresponds to the distance in the direction perpendicular to the extending direction of the second protruding portion EP2-1. Fig. 12A , the distance W between the second protruding parts EP2-1 adjacent to each other P2 and the width W of the fourth sub-protrusion EP-S41 2-1 A distance in a direction substantially parallel to the first direction axis DR1 may be indicated.

[0225] In an exemplary embodiment, the width W of each of the fourth sub-protrusion portions EP-S41 is 2-1 It may be, for example, in the range of about 3 micrometers to about 5 micrometers. In addition, the interval W between the second protruding portions EP2-1 is P2 It may be in the range of, for example, from about 12 microns to about 16 microns.

[0226] In a cross section of the second protruding portion EP2-1 perpendicular to the second base portion BL2-1, a distance W between the second protruding portions EP2-1 adjacent to each other is P2 and the height H of each of the second protruding portions EP2-1 2-1 It can have a relationship represented by the following equation 2-1.

[0227] Equation 2-1

[0228] 0.75≤H 2-1 / W P2 ≤1.35

[0229] In Equation 2-1, as described in Equation 1-1, by changing the width W of the fourth sub-protrusion portion EP-S41 to 2-1 The minimum distance W between the fourth sub-protrusions EP-S41 adjacent to each other 1-1 Add to get the spacing W P2 , and W 2-1 and W 1-1The height H of the second protruding portion EP2-1 corresponds to the distance in the direction perpendicular to the extending direction of the second protruding portion EP2-1. 2-1 Corresponds to the height in the direction corresponding to the third directional axis DR3 which is the thickness direction of the optical film OF-1.

[0230] For example, in an exemplary embodiment, the interval W between the second protruding portions EP2-1 is P2 The height H of the second protruding portion EP2-1 may be in the range of about 12 micrometers to about 16 micrometers, and 2-1 It may be in the range of from about 12 microns to about 16 microns.

[0231] refer to Figures 11 to 12B The fourth sub-protrusion portion EP-S41 may have a second width W in a cross section perpendicular to the second base portion BL2-1. 2-1 The fourth sub-protruding portion EP-S41 may include a fourth sub-bottom surface DS-S4 adjacent to the second base portion BL2-1, a fourth sub-upper surface US-S4 facing the fourth sub-bottom surface DS-S4, and a fourth sub-side surface SS-S4 connecting the fourth sub-bottom surface DS-S4 and the fourth sub-upper surface US-S4.

[0232] The fifth sub-protrusion portion EP-S51 may have a width gradually increasing from the fourth sub-protrusion portion EP-S41 toward the second base portion BL2-1. The fifth sub-protrusion portion EP-S51 may include a fifth sub-bottom surface DS-S5 adjacent to the second base portion BL2-1, a fifth sub-upper surface US-S5 facing the fifth sub-bottom surface DS-S5, and a fifth sub-side surface SS-S5 connecting the fifth sub-bottom surface DS-S5 and the fifth sub-upper surface US-S5.

[0233] The sixth sub-protrusion portion EP-S61 may be arranged between the first base portion BL1-1 and the fourth sub-protrusion portion EP-S41, and may have a width that gradually decreases as the distance from the fourth sub-protrusion portion EP-S41 increases. The sixth sub-protrusion portion EP-S61 may include a sixth sub-bottom surface DS-S6 adjacent to the fourth sub-protrusion portion EP-S41, a sixth sub-upper surface US-S6 facing the sixth sub-bottom surface DS-S6, and a sixth sub-side surface SS-S6 connecting the sixth sub-bottom surface DS-S6 and the sixth sub-upper surface US-S6.

[0234] According to the display device DD-1, the fifth sub-protruding portion EP-S51 may have a trapezoidal shape, and the fifth sub-side surface SS-S5 may have an inclination angle θ in a range from about 69 degrees to about 83 degrees with respect to the fifth sub-bottom surface DS-S5 of the fifth sub-protruding portion EP-S51. S5 .

[0235] In addition, the width of the fifth sub-bottom surface DS-S5 of the fifth sub-protrusion EP-S51 in this exemplary embodiment may be greater than the width of the fifth sub-upper surface US-S5. The width of the fifth sub-bottom surface DS-S5 may be obtained by adding the width of the fifth sub-upper surface US-S5 to the width of the side surface protrusion EP-AD1. The width of the fifth sub-upper surface US-S5 may be substantially the same as the width of the fourth sub-bottom surface DS-S4 of the fourth sub-protrusion EP-S41. In addition, when it is assumed that the maximum width of the fifth sub-bottom surface DS-S5 is “W B5 " and the maximum width of the fifth sub-upper surface US-S5 is "W C5 ”, the maximum width W of the fifth sub-bottom surface DS-S5 B5 and the maximum width W of the fifth sub-surface US-S5 C5 The following equation 3-1 can be satisfied.

[0236] Equation 3-1

[0237] 0.67≤W C5 / W B5 ≤0.91

[0238] The maximum width W of the fifth sub-bottom surface DS-S5 B5 and the maximum width W of the fifth sub-surface US-S5 C5 Corresponding to the width in the direction corresponding to the first direction axis DR1.

[0239] For example, in an exemplary embodiment, the width W of the fifth sub-bottom surface DS-S5 is B5 Can be larger than the width W of the fifth sub-surface US-S5 C5 , the maximum width W of the fifth sub-bottom surface DS-S5 B5 The maximum width W of the fifth sub-surface US-S5 may be in the range of about 3.5 μm to about 6.5 μm. C5 It may be in the range from about 3 microns to about 5 microns.

[0240] In addition, a cross section of the second protrusion portion EP2-1 of the optical film OF-1 may have a shape satisfying the following Equation 4-1.

[0241] Equation 4-1

[0242] 0.06≤H S5 / H 2-1 ≤0.17

[0243] In equation 4-1, H 2-1H represents the maximum height of the second protruding portion EP2-1 in the thickness direction in a cross section of the second protruding portion EP2-1 perpendicular to the second base portion BL2-1, and H S5 represents the maximum height of the fifth sub-protrusion portion EP-S51 in the thickness direction in the cross section. The maximum height H of the second protrusion portion EP2-1 in the thickness direction 2-1 and the maximum height H of the fifth sub-protrusion EP-S51 in the thickness direction S5 Corresponding to the height in the direction corresponding to the fourth direction axis DR4.

[0244] The height H of the fifth sub-protrusion portion EP-S51 in the thickness direction is S5 It may be, for example, in the range of about 1 micrometer to about 2 micrometers. In addition, the maximum height H of the second protruding portion EP2-1 in the thickness direction is 2-1 It may be in the range of, for example, from about 12 microns to about 16 microns.

[0245] In this exemplary embodiment, the sixth sub-protruding portion EP-S61 may have a trapezoidal shape, and the sixth sub-side surface SS-S6 may have an inclination angle θ in a range from about 69 degrees to about 83 degrees with respect to the sixth sub-bottom surface DS-S6 of the sixth sub-protruding portion EP-S61. S6 .

[0246] In addition, the width of the sixth sub-bottom surface DS-S6 of the sixth sub-protruding portion EP-S61 of the display device DD-1 in this exemplary embodiment may be greater than the width of the sixth sub-upper surface US-S6. The width of the sixth sub-bottom surface DS-S6 may be obtained by adding the width of the sixth sub-upper surface US-S6 to the width of the chamfered portion EP-OP1. The width of the sixth sub-bottom surface DS-S6 may be substantially the same as the width of the fourth sub-upper surface US-S4 of the fourth sub-protruding portion EP-S41. In addition, when it is assumed that the maximum width of the sixth sub-bottom surface DS-S6 is “W B6 " and the maximum width of the sixth sub-upper surface US-S6 is "W C6 ”, “W B6 ” and “W C6 ” can satisfy the following equation 5-1.

[0247] Equation 5-1

[0248] 0.67≤W C6 / W B6 ≤0.90

[0249] The maximum width W of the sixth sub-bottom surface DS-S6 B6 and the maximum width W of the sixth sub-surface US-S6 C6Corresponding to the width in the direction corresponding to the first direction axis DR1.

[0250] For example, in an exemplary embodiment, the width W of the sixth sub-bottom surface DS-S6 is B6 Can be larger than the width W of the sixth sub-surface US-S6 C6 , the maximum width W of the sixth sub-bottom surface DS-S6 B6 The maximum width W of the sixth sub-surface US-S6 may be in the range of about 3 μm to about 5 μm. C6 It may be in the range of from about 2 microns to about 4.5 microns.

[0251] In addition, the cross-section of the second protrusion portion EP2-1 may have a shape satisfying the following Equation 6-1.

[0252] Equation 6-1

[0253] 0.06≤H S6 / H 2-1 ≤0.17

[0254] In Equation 6-1, H 2-1 H represents the maximum height of the second protruding portion EP2-1 in the thickness direction in a cross section of the second protruding portion EP2-1 perpendicular to the second base portion BL2-1, and H S6 represents the maximum height of the sixth sub-protrusion portion EP-S61 in the thickness direction in the cross section. The maximum height H of the second protrusion portion EP2-1 in the thickness direction 2-1 and the maximum height H of the sixth sub-protrusion EP-S61 in the thickness direction S6 Corresponding to the height in the direction corresponding to the fourth direction axis DR4.

[0255] The height H of the sixth sub-protrusion portion EP-S61 in the thickness direction is S6 It may be, for example, in the range of about 1 micrometer to about 2 micrometers. In addition, the maximum height H of the second protruding portion EP2-1 in the thickness direction is 2-1 It may be in the range of, for example, from about 12 microns to about 16 microns.

[0256] When the optical film included in the display device in this exemplary embodiment includes a second pattern layer including a second protruding portion and a first pattern layer having a refractive index higher than that of the second pattern layer, and each of the second protruding portions satisfies the relationship expressed by equations 1-1 to 6-1, the front characteristics and side viewing angle characteristics of the display device can be improved.

[0257] In reference Fig.11 , Fig. 12A and Fig. 12BIn the optical film OF-1 in the described exemplary embodiment, the fourth sub-side surface SS-S4 of the fourth sub-protrusion portion EP-S41 may be substantially perpendicular to the fourth sub-bottom surface DS-S4, and the second protrusion portion EP2-1 of the second pattern layer RP2-1 having a refractive index lower than that of the first pattern layer RP1-1 may satisfy equations 1-1 to 6-1. When viewed in cross section, the fourth sub-side surface SS-S4 may have an inclination angle θ of approximately 86 to 90 degrees relative to the fourth sub-bottom surface DS-S4. S4 The display device DD-1 including the optical film OF-1 in this exemplary embodiment can exhibit excellent visibility. That is, because the emission amount of white light in the front direction is increased and the GDI value in the side viewing direction of about 60 degrees is also improved, the display device DD-1 including the optical film OF-1 in this exemplary embodiment can exhibit excellent display quality.

[0258] Fig.13A is a diagram showing the light path in the optical film OF-1', and Fig. 12A and Fig. 12B Compared with the optical film OF-1 shown in FIG. 1 , the first protruding portion EP1-1′ in the optical film OF-1′ has a trapezoidal shape in its cross section. The side surface of the first protruding portion EP1-1′ is Fig.13A The cross section has an inclination angle of about 80 degrees to about 85 degrees. CT 'Incident in the front direction Fig.13A When the incident light I CT ' is reflected or refracted at the boundary between the first pattern layer RP1-1' and the second pattern layer RP2-1' and provided to the second pattern layer RP2-1' including the second base portion BL2-1' and the second protruding portion EP2-1'. As the reflected light I reflected from the boundary between the first pattern layer RP1-1' and the second pattern layer RP2-1' RF ', the light provided to the second pattern layer RP2-1' is tilted in the lateral direction to serve as the side light I 01 In addition, the light refracted at the boundary between the first pattern layer RP1-1' and the second pattern layer RP2-1' passes through the second pattern layer RP2-1' to be emitted as the side light I inclined in the lateral direction. 01 That is, when the optical film OF-1' including the first protruding portion EP1-1' having a trapezoidal shape in cross section is used, light I incident in the front direction CT 'As side light I 01 ' is emitted, and therefore, the amount of white light is reduced in the front direction.

[0259] In addition, the light incident on the side surface IST The front light I is reflected or refracted at the inclined surface of the first protruding portion EP1-1' having a trapezoidal shape in its cross section to be 02 ' is emitted. Therefore, the emission amount of light in the front direction increases in the black state, and thus the contrast decreases.

[0260] like Fig. 13B As shown in FIG. 1 , in this exemplary embodiment of the optical film OF-1, the side surface of the first protruding portion EP1-1 may include a first sub-side surface SS-S1 arranged perpendicularly to the bottom surface, a second sub-side surface SS-S2 as an inclined surface arranged adjacent to the first base portion BL1-1, and a third sub-side surface SS-S3 as an inclined surface arranged adjacent to the second base portion BL2-1. Light I incident into the first protruding portion EP1-1 in the front direction CT The refracted light I is not reflected by the first sub-side surface SS-S1 of the first protruding portion EP1-1, is reflected or refracted at the third sub-side surface SS-S3 to be incident into the second pattern layer RP2-1, and is transmitted through the second pattern layer RP2-1 as the refracted light I 01 That is, despite the incident light I CT Compared to the refracted light I to be emitted 01 The direction of the first protruding portion EP1-1' is partially changed due to the third sub-side surface SS-S3 as an inclined surface and the refractive index difference between the first pattern layer RP1-1 and the second pattern layer RP2-1, but the light exit angle of the light directed to the side surface can be reduced, or the entire side surface of the first protruding portion EP1-1' is changed as shown in FIG. Fig.13A Compared with the inclined optical film OF-1' shown in FIG. 1 , the amount of light incident on the front surface and output to the side surface can be reduced. Therefore, the reduction of white light in the front direction is similar to Fig.13A The reduction can be minimized.

[0261] In addition, the incident Fig. 13B The light I in the side surface of the optical film OF-1 shown in FIG. ST It can be refracted at the second sub-side surface SS-S2 and can be used as the side light I 02 That is, since the first protruding portion EP1-1 includes Fig. 13B The first sub-protrusion portion EP-S11 shown in FIG. 1 has a rectangular shape in cross section, and thus corresponds to the entire side surface of the first protrusion portion EP1-1′ as shown in FIG. Fig.13A Compared with the optical film OF-1' having an inclined surface shown in FIG. , the amount of light incident on the side surface and emitted through the front surface can be reduced. Fig.13A Compared with the display device of the optical film OF-1' shown in FIG. Fig. 13BThe optical film OF-1 shown in the figure can improve the contrast of the display device and include Fig. 13B 1 shows the display quality of the display device at a side viewing angle of the optical film OF-1.

[0262] Incident to Fig. 13B The light I in the side surface of the optical film OF-1 shown in FIG. ST The second sub-side surface SS-S2 of the second sub-protruding portion EP-S21 may be reflected or refracted to be incident into the second pattern layer RP2-1, and the second pattern layer RP2-1 may be passed through to be used as the front light I 03 In this case, since the entire side surface of the first protruding portion EP1-1' corresponds to Fig.13A Compared with the optical film OF-1' having an inclined surface shown in FIG. 1, the ratio of the first protruding portion EP1-1 to the second sub-side surface SS-S2 of the optical film OF-1 in this exemplary embodiment is relatively small, so the light incident in the side surface direction and reflected or refracted at the second sub-side surface SS-S2 is used as the front light I 03 The amount of light emitted can be much reduced compared to the comparative example. Fig.13A The emission amount of light emitted in the front direction is reduced in the black state compared to the emission amount of light emitted in the front direction, and therefore, the contrast ratio is increased in the front direction.

[0263] Therefore, compared with the comparative example in which the cross section of the first protruding portion EP1-1' has a trapezoidal shape, in the optical film OF-1 including the first protruding portion EP1-1 according to the embodiment example, the reduction of white light emitted in the front direction can be minimized, and the ratio of light emitted in the front direction in the black state can be reduced to increase the contrast of the display device. In addition, by providing the second sub-protruding portion EP-S21 and the third sub-protruding portion EP-S31 in the lower end and the upper end of the first protruding portion EP1-1, the display quality at the side viewing angle can be improved.

[0264] Fig.14A It is shown in Fig.13A FIG. 1 is a graph showing the relationship between the incident angle of light and the emission angle of light in the structure of the optical film OF-1' of the comparative example shown in FIG. Fig.14A LI 01 'The indicated line corresponds to Fig.13A The light incident on the front surface I CT 'As side light I 01 'Emission situation. In addition, by Fig.14A LI 02 'The indicated line corresponds to Fig.13A The light incident on the side surface I ST 'As positive light I02 'The launch situation.

[0265] Fig. 14B It is shown in Fig. 13B FIG. 1 is a graph showing the relationship between the incident angle of light and the emission angle of light in the structure of the optical film OF-1 of the exemplary embodiment shown in FIG. Fig.14A Compared with reference Fig. 14B In the case of the exemplary embodiment of the display device including the optical film OF-1, one emission line LI is observed. 0 Instead of like line LI 01 ' and LI 02 'same single line. That is, the light incident in the front direction is regarded as the front light I 01 The light emitted and incident in the lateral direction is regarded as the side light I 02 In addition, a sub-emission line SL in which light incident in the front direction is emitted within a side viewing angle ranging from about 20 degrees to about 50 degrees is observed, and thus the display quality in the side viewing angle direction can be improved.

[0266] Table 3 shows the Fig.11 In the display device DD-1 in the exemplary embodiment shown in FIG. 1 , the second protrusion portion EP2-1 having a relatively lower refractive index than the first protrusion portion EP1-1 has a width W of about 4 micrometers. 2-1 and the interval W between the second protruding portions EP2-1 adjacent to each other P2 In the case of about 12 microns, the GDI value and contrast are compared according to the changes in the width and height of the fifth sub-protrusion EP-S51 and the sixth sub-protrusion EP-S61 in the cross section and the changes in the inclination angle of the side surfaces of the fifth sub-protrusion EP-S51 and the sixth sub-protrusion EP-S61.

[0267] Table 3

[0268]

[0269]

[0270] Referring to the comparison results of Table 3, in which the side surface protrusion portion EP-AD1 of the fifth sub-protrusion portion EP-S51 has a height H ranging from about 1 μm to about 2 μm. S5 , a width W from about 0.25 micrometers to about 0.75 micrometers A5 and a tilt angle θ from about 69 degrees to about 83 degrees S5The case where the chamfered portion EP-OP1 of the sixth sub-protruding portion EP-S61 has a height H from about 1 μm to about 2 μm S6 , a width W from about 0.25 micrometers to about 0.50 micrometers O6 and a tilt angle θ from about 76 degrees to about 83 degrees S6 In the combination of the cases of , the GDI value is expressed as a low value of less than about 0.2. That is, the optical film in this exemplary embodiment can be used to improve the side viewing angle characteristics of the display device.

[0271] The front CR values ​​shown in Table 3 are adjusted by a combination of the shape of the side surface protruding portion EP-AD1 of the fifth sub-protruding portion EP-S51 and the shape of the chamfered portion EP-OP1 of the sixth sub-protruding portion EP-S61. For example, in an exemplary embodiment, the height H of the side surface protruding portion EP-AD1 in the cross section is S5 , Width W A5 and the tilt angle θ S5 The cases where the height H of the chamfered portion EP-OP1 in the cross section is about 2 micrometers, about 0.25 micrometers, and about 83 degrees are respectively S6 , Width W O6 and the tilt angle θ S6 Excellent front contrast ratio was obtained in the combination of about 2 micrometers, about 0.25 micrometers, and about 83 degrees, respectively.

[0272] When the optical film includes a pattern layer including a second protrusion having a relatively low refractive index, the width W of each fourth sub-protrusion is 2-1 The distance W between the adjacent second protrusions P2 The ratio of is in the range of about 0.15 to about 0.45, and the height H of each second protrusion portion 2-1 The distance W between the adjacent second protrusions P2 When the ratio of is in the range from about 0.75 to about 1.35, excellent visibility of the display device is obtained. In addition, by the optical film including the sub-protrusion portion satisfying the above-mentioned equations 3-1 to 6-1, excellent visibility is exhibited in a side viewing angle.

[0273] Fig.15 is a graph showing a comparison result of a GDI value according to a refractive index difference between a first pattern layer RP1 - 1 and a second pattern layer RP2 - 1 of an optical film OF- 1 included in a display device DD- 1 . Fig.15 The GDI value according to the refractive index difference between the first pattern layer RP1-1 and the second pattern layer RP2-1 and the height of the second protrusion portion EP2-1 is shown.

[0274] refer to Fig.15 As the refractive index difference between the first pattern layer RP1-1 and the second pattern layer RP2-1 increases, the GDI value decreases, and thus the viewing angle characteristics of the display device are improved. In addition, when the refractive index difference between the first pattern layer RP1-1 and the second pattern layer RP2-1 is in the range from about 0.2 to about 0.25, the visibility of the display device is improved. That is, when the refractive index difference between the first pattern layer RP1-1 and the second pattern layer RP2-1 is in the range from about 0.2 to about 0.25 and the height of the second protruding portion EP2-1 is in the range from about 12 micrometers to about 16 micrometers, the desired GDI value is obtained.

[0275] Fig.16A and Fig. 16B is a graph showing distribution of GDI values ​​according to viewing angles.

[0276] Fig.16A The results of Comparative Example 1 and Figure 3 The GDI value of the viewing angle of the embodiment example 1 in the display device DD shown in FIG. That is, Fig.16A The display quality evaluation results of an optical film in which a pattern layer having a relatively low refractive index is arranged adjacent to a liquid crystal display panel are shown. In the case of Comparative Example 1, in a trapezoidal shape corresponding to a cross section of a first protruding portion of the optical film, a side surface of the first protruding portion has an inclination angle of about 80 degrees relative to a bottom surface. Embodiment Example 1 corresponds to a pattern layer including Figure 6 The display device of the optical film shown in FIG. Fig.16A In Comparative Example 1 and Embodiment Example 1, GDI values ​​were compared with each other according to viewing angles under the same conditions except that the optical films had shapes different from each other.

[0277] refer to Fig.16A , Example 1 of Embodiment shows a lower GDI value than Comparative Example 1 at a side viewing angle equal to or greater than about 60 degrees, and it can be seen that the display quality of Example 1 of Embodiment is improved in the side viewing angle direction compared with the display quality in Comparative Example 1.

[0278] Fig. 16B The comparative examples 2 and Fig.11 The GDI value of the viewing angle of the embodiment example 2 in the display device DD-1 shown in FIG. That is, Fig. 16B The display quality evaluation results of an optical film in which a pattern layer having a relatively higher refractive index is arranged adjacent to a liquid crystal display panel are shown. In the case of Comparative Example 2, the side surface of the second protruding portion has an inclination angle of about 80 degrees relative to the bottom surface in a trapezoidal shape corresponding to a cross section of the second protruding portion of the optical film. Embodiment Example 2 corresponds to a device including Fig. 12AThe display device of the optical film shown in FIG. Fig. 16B In Comparative Example 2 and Embodiment Example 2, GDI values ​​were compared with each other according to viewing angles under the same conditions except that the optical films had shapes different from each other.

[0279] refer to Fig. 16B , Example 2 of Embodiment shows a lower GDI value than Comparative Example 2 at a side viewing angle equal to or greater than approximately 50 degrees, and it can be seen that the display quality of Example 2 of Embodiment is improved in the side viewing angle direction compared with the display quality in Comparative Example 2.

[0280] Fig.17 is a cross-sectional view showing an exemplary embodiment of a display device DD-2 according to the present invention. In the following, Fig.17 The display device DD-2 shown in the reference Figures 1 to 12B The same descriptions as those described will be omitted, and thus different features will be mainly described. The display device DD-2 in this exemplary embodiment includes a liquid crystal display panel DP and an optical film OF-b arranged on the liquid crystal display panel DP. The display device DD-2 in this exemplary embodiment may include a light source member LU arranged under the liquid crystal display panel DP and an optical member OU-b arranged on the liquid crystal display panel DP and including the optical film OF-b.

[0281] The optical film OF-b included in the display device DD-2 in this exemplary embodiment includes a first pattern layer RP1-b and a second pattern layer RP2. The first pattern layer RP1-b may have a lower refractive index than that of the second pattern layer RP2.

[0282] In an exemplary embodiment of the optical film OF-b included in the display device DD-2, the arrangement of the first pattern layer RP1-b and the second pattern layer RP2 may be the same as that of the reference Figure 6 The arrangements in the described optical films OF are basically the same.

[0283] However, the first pattern layer RP1-b of the optical film OF-b may be used as an adhesive layer. The first pattern layer RP1-b may be used as a coupling member for attaching the upper polarization layer POL-T of the liquid crystal display panel DP adjacent to each other to the optical member OU-b. In an exemplary embodiment, the first pattern layer RP1-b may be, for example, but not limited to, an optically transparent adhesive layer.

[0284] That is, the optical film OF-b may be directly disposed on the liquid crystal display panel DP in the display device DD-2 in this exemplary embodiment. Figure 3 Compared with the display device DD shown in , the adhesive layer AD can be omitted between the liquid crystal display panel DP and the optical member OU-b.

[0285] The display device in this exemplary embodiment includes an optical film disposed on a liquid crystal display panel and including two pattern layers having different refractive indices from each other, and thus the display device can provide improved viewing angle characteristics, front brightness characteristics, and contrast. The optical film in this exemplary embodiment includes a protrusion, the protrusion including both a sub-protrusion having a side surface substantially perpendicular to a bottom surface and a sub-protrusion having an inclined angle relative to the bottom surface, and thus the display device can have improved display quality.

[0286] In addition, the optical film in this exemplary embodiment includes a sub-protrusion having a side surface substantially perpendicular to the bottom surface, and includes a pattern layer that satisfies the relationship between the width of the protrusion, the spacing between protrusions adjacent to each other, the height of the protrusion, and the size of the side surface protrusion and the chamfered portion, and thus the display device can have improved display quality.

[0287] Although exemplary embodiments of the present invention have been described, it should be understood that the present invention should not be limited to these exemplary embodiments, but a person skilled in the art may make various changes and modifications within the spirit and scope of the present invention as hereinafter claimed.

[0288] Therefore, the disclosed subject matter should not be limited to any single embodiment described herein, and the scope of the present invention should be determined in accordance with the following claims.

Claims

1. An optical film comprising: a first pattern layer having a first refractive index and comprising a first base portion and a plurality of first protrusion portions arranged on the first base portion and spaced apart from each other; as well as A second pattern layer disposed on the first pattern layer and having a second refractive index different from the first refractive index, each of the plurality of first protruding portions comprising: a first sub-protrusion portion having a first width in a cross section perpendicular to the first base portion; a second sub-protruding portion disposed between the first base portion and the first sub-protruding portion and having a width increasing from the first sub-protruding portion to the first base portion; and a third sub-protrusion portion, arranged on the first sub-protrusion portion and having a width that decreases as the distance from the first sub-protrusion portion increases, The first sub-protrusion portion has a rectangular shape in the cross section perpendicular to the first base portion.

2. The optical film according to claim 1, wherein An absolute value of a difference between the first refractive index and the second refractive index ranges from 0.2 to 0.

25.

3. The optical film according to claim 1, wherein The first sub-protrusion includes a first sub-bottom surface adjacent to the second sub-protrusion, a first sub-upper surface facing the first sub-bottom surface, and a first sub-side surface connecting the first sub-bottom surface and the first sub-upper surface, and the first sub-side surface has an inclination angle from 86 degrees to 90 degrees relative to the first sub-bottom surface.

4. The optical film according to claim 1, wherein The first refractive index is smaller than the second refractive index, and in the cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protruding portions among the plurality of first protruding portions is P1 and the first width W1 of the first sub-protruding portion have a relationship represented by the following equation 1, Equation 1 0.15≤W1 / W P1 ≤0.45, Where W P1 The first width W1 of the first sub-protruding portion is obtained by adding the minimum interval W2 between the first sub-protruding portions of the adjacent first protruding portions, and W1 and W2 correspond to distances in a direction perpendicular to an extending direction of the first protruding portion.

5. The optical film according to claim 1, wherein The first refractive index is smaller than the second refractive index, and in the cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protruding portions among the plurality of first protruding portions is P1 and the height H1 of each of the plurality of first protruding portions have a relationship represented by the following Equation 2, Equation 2 0.75≤H1 / W P1 ≤1.35, Where W P1 The first width W1 of the first sub-protruding portion is obtained by adding the minimum interval W2 between the first sub-protruding portions of the adjacent first protruding portions, and W1 and W2 correspond to distances in a direction perpendicular to an extending direction of the first protruding portion.

6. The optical film according to claim 1, wherein: Each of the second sub-protrusion portion and the third sub-protrusion portion has a trapezoidal shape in the cross section perpendicular to the first base portion.

7. The optical film according to claim 6, wherein: A width of an upper surface of the second sub-protrusion portion is equal to the first width of the first sub-protrusion portion, and a width of a lower surface of the third sub-protrusion portion is equal to the first width of the first sub-protrusion portion.

8. The optical film according to claim 6, wherein: The second sub-protrusion portion includes a second sub-bottom surface adjacent to the first base portion, a second sub-upper surface facing the second sub-bottom surface, and a second sub-side surface connecting the second sub-bottom surface and the second sub-upper surface, and the second sub-side surface has an inclination angle from 69 degrees to 83 degrees relative to the second sub-bottom surface.

9. The optical film according to claim 8, wherein: In a cross section of the second sub-protruding portion perpendicular to the first base portion, the maximum width W of the second sub-bottom surface is B2 and the maximum width W of the second sub-upper surface C2 Satisfies the following equation 3, Equation 3 0.67≤W C2 / IN B2 ≤0.91。 10. The optical film according to claim 8, wherein: In a cross section of the first protruding portion perpendicular to the first base portion, a maximum height H1 of the first protruding portion in the thickness direction and a maximum height H2 of the second sub-protruding portion in the thickness direction are 1.1 and 1.2, respectively. S2 Satisfies the following equation 4, Equation 4 0.06≤H S2 / H1≤0.17。 11. The optical film according to claim 6, wherein: The third sub-protrusion includes a third sub-bottom surface adjacent to the first sub-protrusion, a third sub-upper surface facing the third sub-bottom surface, and a third sub-side surface connecting the third sub-bottom surface and the third sub-upper surface, and the third sub-side surface has an inclination angle from 69 degrees to 83 degrees relative to the third sub-bottom surface.

12. The optical film according to claim 11, wherein In a cross section of the third sub-protruding portion perpendicular to the first base portion, the maximum width W of the third sub-bottom surface is B3 and the maximum width W of the third sub-upper surface C3 Satisfies the following equation 5, Equation 5 0.67≤W C3 / IN B3 ≤0.90。 13. The optical film according to claim 11, wherein: In a cross section perpendicular to the first base portion of each of the plurality of first protruding portions, a maximum height H1 of the first protruding portion in the thickness direction and a maximum height H2 of the third sub-protruding portion in the thickness direction are 100° and 100°, respectively. S3 Satisfies the following equation 6, Equation 6 0.06≤H S3 / H1≤0.17。 14. The optical film according to claim 1, wherein: The second pattern layer comprises: a second substrate portion facing the first substrate portion; and A plurality of second protruding portions are disposed below the second base portion.

15. The optical film according to claim 14, wherein: Each of the plurality of first protrusion portions and the plurality of second protrusion portions has a stripe shape extending in one direction.

16. The optical film according to claim 15, wherein: The first pattern layer further includes a first recessed portion defined between the plurality of first protruding portions, the second pattern layer further includes a second recessed portion defined between the plurality of second protruding portions, the plurality of first protruding portions respectively correspond to the second recessed portions, and the plurality of second protruding portions respectively correspond to the first recessed portions.

17. A display device comprising: Liquid crystal display panel; as well as An optical film arranged on the liquid crystal display panel, the optical film comprising: a first pattern layer having a first refractive index and including a first base portion and a plurality of first protrusion portions arranged on the first base portion and spaced apart from each other; and A second pattern layer disposed on the first pattern layer and having a second refractive index different from the first refractive index, each of the plurality of first protruding portions comprising: a first sub-protrusion portion having a first width in a cross section perpendicular to the first base portion; a second sub-protruding portion disposed between the first base portion and the first sub-protruding portion and having a width increasing from the first sub-protruding portion to the first base portion; and a third sub-protrusion portion, arranged on the first sub-protrusion portion and having a width that decreases as the distance from the first sub-protrusion portion increases, The first sub-protrusion portion has a rectangular shape in the cross section perpendicular to the first base portion.

18. The display device according to claim 17, wherein: An absolute value of a difference between the first refractive index and the second refractive index ranges from 0.2 to 0.

25.

19. The display device according to claim 17, wherein: The first refractive index is smaller than the second refractive index, and in the cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protruding portions among the plurality of first protruding portions is P1 and the first width W1 of the first sub-protruding portion have a relationship represented by the following equation 1, Equation 1 0.15≤W1 / W P1 ≤0.45, Where W P1 The first width W1 of the first sub-protruding portion is obtained by adding the minimum interval W2 between the first sub-protruding portions of the adjacent first protruding portions, and W1 and W2 correspond to distances in a direction perpendicular to an extending direction of the first protruding portion.

20. The display device according to claim 17, wherein: The first refractive index is smaller than the second refractive index, and in the cross section perpendicular to the first substrate portion, a spacing W between mutually adjacent first protruding portions among the plurality of first protruding portions is P1 and the height H1 of each of the plurality of first protruding portions have a relationship represented by the following Equation 2, Equation 2 0.75≤H1 / W P1 ≤1.35, Where W P1 The first width W1 of the first sub-protruding portion is obtained by adding the minimum interval W2 between the first sub-protruding portions of the adjacent first protruding portions, and W1 and W2 correspond to distances in a direction perpendicular to an extending direction of the first protruding portion.

21. The display device according to claim 17, wherein: The second pattern layer comprises: a second substrate portion facing the first substrate portion; and a plurality of second protruding portions disposed below the second base portion, and each of the plurality of second protruding portions comprises: a fourth sub-protrusion portion having a second width in a cross section perpendicular to the second base portion; a fifth sub-protrusion portion disposed between the second base portion and the fourth sub-protrusion portion and having a width increasing from the fourth sub-protrusion portion to the second base portion; and A sixth sub-protrusion portion is disposed between the first base portion and the fourth sub-protrusion portion and has a width that decreases from the fourth sub-protrusion portion to the first base portion.

22. The display device according to claim 21, wherein: The first refractive index is greater than the second refractive index, and in a cross section perpendicular to the second substrate portion, a spacing W between mutually adjacent second protruding portions of the plurality of second protruding portions is P2 and the second width W of the fourth sub-protrusion 2-1 Having the relationship represented by the following equation 1-1, Equation 1-1 0.15≤W 2-1 / IN P2 ≤0.45, Where W P2 By increasing the second width W of the fourth sub-protruding portion 2-1 The minimum distance W between the fourth sub-protrusion and the adjacent second protrusion 1-1 Add them together and W 1-1 and W 2-1 Corresponds to a distance in a direction perpendicular to the extending direction of the second protruding portion.

23. The display device according to claim 21, wherein: The first refractive index is greater than the second refractive index, and in the cross section perpendicular to the second substrate portion, a spacing W between mutually adjacent second protruding portions of the plurality of second protruding portions is P2 The height H of each of the plurality of second protrusions is 2-1 Having the relationship expressed by the following equation 2-1, Equation 2-1 0.75≤H 2-1 / IN P2 ≤1.35, Where W P2 By increasing the second width W of the fourth sub-protruding portion 2-1 The minimum distance W between the fourth sub-protrusion and the adjacent second protrusion 1-1 Add them together and W 1-1 and W 2-1 Corresponds to a distance in a direction perpendicular to the extending direction of the second protruding portion.

24. The display device according to claim 17, wherein: Each of the second sub-protrusion portion and the third sub-protrusion portion has a trapezoidal shape in the cross section perpendicular to the first base portion.

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