Optical sheet and method for manufacturing optical sheet

Abstract

The present invention relates to an optical sheet and a method for manufacturing the optical sheet. The optical sheet includes: a first wedge-shaped layer having a first refractive index and including a wedge-shaped prism pattern including an inclined surface having an inclination angle relative to a plane defined by a first direction and a second direction perpendicular to the first direction and a vertical surface extending in a third direction perpendicular to the first direction and the second direction; a second wedge-shaped layer disposed on the first wedge-shaped layer and having a second refractive index greater than the first refractive index; and a light blocking pattern disposed between the first wedge-shaped layer and the second wedge-shaped layer and including a first surface contacting the vertical surface and a second surface inclined to have an inclination angle relative to the plane while contacting the inclined surface.

Description

Technical Field

[0001] Embodiments generally relate to an optical sheet and a display device including the same. More particularly, exemplary embodiments of the inventive concept relate to an optical sheet, a method of manufacturing the optical sheet, and a display device including the same. Background Art

[0002] As technology advances, display products with smaller size, lighter weight and superior performance have been produced. Conventional cathode ray tube (CRT) televisions have been widely used as display devices, which have many advantages in terms of performance and price. However, recently, display devices that have overcome the weaknesses of CRT in terms of miniaturization or portability, have advantages such as miniaturization, light weight and low power consumption, and such as plasma display devices, liquid crystal display devices and organic light emitting display devices have attracted attention. Summary of the invention

[0003] The display device may include an optical sheet configured to limit the viewing angle. Conventional optical sheets may limit the emission angle by absorbing light having an emission angle equal to or greater than a cutoff angle using a louver structure having a high aspect ratio. Therefore, there is a problem of brightness loss.

[0004] Some example embodiments provide an optical sheet that minimizes brightness loss and limits an emission angle.

[0005] Some example embodiments provide a method of manufacturing an optical sheet.

[0006] Some example embodiments provide a display device including an optical sheet.

[0007] According to aspects of exemplary embodiments, an optical sheet includes: a first wedge-shaped layer having a first refractive index and including a wedge-shaped prism pattern including a first inclined surface having a first inclination angle relative to a plane defined by a first direction and a second direction perpendicular to the first direction and a first vertical surface extending in a third direction perpendicular to the first direction and the second direction; a second wedge-shaped layer disposed on the first wedge-shaped layer and having a second refractive index greater than the first refractive index; and a first light-blocking pattern disposed between the first wedge-shaped layer and the second wedge-shaped layer and including a first surface contacting the first vertical surface and a second surface inclined to have the first inclination angle relative to the plane while contacting the first inclined surface.

[0008] In an exemplary embodiment, the optical sheet may further include a base film disposed on a lower surface of the first wedge-shaped layer or an upper surface of the second wedge-shaped layer.

[0009] In exemplary embodiments, the second surface of the first light blocking pattern may be a surface closest to the base film among the surfaces of the first light blocking pattern.

[0010] In an exemplary embodiment, the first light blocking pattern may include: a first layer which is parallel to the first vertical surface and includes metal; a second layer which is parallel to the first layer, spaced apart from the first layer, and includes metal; and a first insulating layer disposed between the first layer and the second layer.

[0011] In an exemplary embodiment, the first layer may include a first portion in contact with the first vertical surface and a second portion extending from the first vertical surface and in contact with the first inclined surface.

[0012] The first layer may have a first thickness, and the second layer may have a second thickness that is thinner than the first layer.

[0013] In an exemplary embodiment, the optical sheet may further include: a third layer parallel to the second layer, spaced apart from the second layer, and including a metal; and a second insulating layer disposed between the second layer and the third layer. Here, the second layer may be disposed between the first insulating layer and the second insulating layer.

[0014] In example embodiments, the first light blocking pattern may include a third surface facing the second surface, and the third surface may be parallel to a plane defined by the first direction and the second direction.

[0015] In exemplary embodiments, the prism pattern of the first wedge layer may extend in the first direction, the prism pattern may be provided in plurality, and the plurality of prism patterns may be arranged in the second direction.

[0016] In an exemplary embodiment, the optical sheet may further include: a third wedge-shaped layer disposed on the second wedge-shaped layer, having a third refractive index, and including a wedge-shaped prism pattern including a second inclined surface having a second inclination angle inclined in a direction different from the first inclination angle with respect to a plane and a second vertical surface extending in a third direction; a fourth wedge-shaped layer disposed on the third wedge-shaped layer and having a fourth refractive index greater than the third refractive index; and a second light-blocking pattern disposed between the third wedge-shaped layer and the fourth wedge-shaped layer and including a first surface contacting the second vertical surface and a second surface inclined to have the second inclination angle with respect to the plane while contacting the second inclined surface.

[0017] In an exemplary embodiment, the prism pattern of the first wedge layer may be provided in plurality, the plurality of prism patterns of the first wedge layer may be arranged in one direction, and the distance between two adjacent first vertical surfaces may be defined as a first pitch of the plurality of prism patterns of the first wedge layer. In addition, the prism pattern of the third wedge layer may be provided in plurality, the plurality of prism patterns of the third wedge layer may be arranged in one direction, and the distance between two adjacent second vertical surfaces may be defined as a second pitch of the plurality of prism patterns of the third wedge layer. In addition, the first pitch of the plurality of prism patterns of the first wedge layer and the second pitch of the plurality of prism patterns of the third wedge layer are different from each other.

[0018] In an exemplary embodiment, the optical sheet may further include an anti-reflection layer disposed on the first inclined surface.

[0019] In exemplary embodiments, the square wave pattern may be defined by the first inclined surface.

[0020] According to aspects of exemplary embodiments, a method of manufacturing an optical sheet includes: forming a first wedge-shaped layer on a base film, wherein the first wedge-shaped layer has a first refractive index and includes a wedge-shaped prism pattern including an inclined surface having an inclined angle relative to a main surface plane defining the base film and a vertical surface extending in a direction perpendicular to the main surface plane of the base film; forming a light blocking pattern on the vertical surface of the first wedge-shaped layer; and forming a second wedge-shaped layer having a second refractive index on the first wedge-shaped layer on which the light blocking pattern is formed.

[0021] In an exemplary embodiment, forming the first wedge layer on the base film may include: forming a resin layer on the base film; forming a prism pattern on the resin layer by using a mold; and curing the resin layer.

[0022] In an exemplary embodiment, forming the light blocking pattern on the vertical surface of the first wedge layer may include: forming a first raw material layer including a metal on the first wedge layer; forming a first raw material insulating layer on the first raw material layer; forming a second raw material layer including a metal on the first raw material insulating layer; and forming the light blocking pattern including the first layer, the first insulating layer, and the second raw material layer by etching the second raw material layer, the first raw material insulating layer, and the first raw material layer using an anisotropic etching process.

[0023] In exemplary embodiments, a thickness of the first layer may be different from a thickness of the second layer.

[0024] According to aspects of exemplary embodiments, a display device includes: a display panel that displays an image; and an optical sheet disposed on the display panel to limit the light emission angle of the display panel. Here, the optical sheet includes: a first wedge-shaped layer having a first refractive index and including a wedge-shaped prism pattern, the prism pattern including an inclined surface having an inclination angle relative to a main surface plane defining the display panel and a vertical surface extending in a direction perpendicular to the main surface plane of the display panel; a second wedge-shaped layer disposed on the first wedge-shaped layer and having a second refractive index greater than the first refractive index; and a light blocking pattern disposed between the first wedge-shaped layer and the second wedge-shaped layer and including a first surface in contact with the vertical surface and a second surface inclined to have an inclination angle relative to the main surface plane of the display panel while contacting the inclined surface.

[0025] In an exemplary embodiment, the display device may be a display device for a vehicle, and the direction in which the light emission angle of the display panel is limited may be an upward direction relative to a direction perpendicular to a main surface plane of the display panel.

[0026] In an exemplary embodiment, the direction in which the light emission angle of the display panel is limited may further include a left direction and a right direction with respect to a direction perpendicular to a main surface plane of the display panel.

[0027] Therefore, the optical sheet according to the exemplary embodiment includes: a first wedge-shaped layer having a first refractive index and including a wedge-shaped prism pattern including an inclined surface having an inclined angle relative to a plane defined by a first direction and a second direction perpendicular to the first direction and a vertical surface extending in a third direction perpendicular to the first direction and the second direction; a second wedge-shaped layer disposed on the first wedge-shaped layer and having a second refractive index greater than the first refractive index; and a light blocking pattern disposed between the first wedge-shaped layer and the second wedge-shaped layer and including a first surface contacting the vertical surface and a second surface inclined to have an inclined angle relative to the plane while contacting the inclined surface. Therefore, a display device capable of limiting light emitted from the display device at a cutoff angle or more can be obtained by using the optical sheet.

[0028] Therefore, since the optical sheet has the light blocking pattern disposed on the vertical surface, the aspect ratio of the optical sheet as a whole may be high, so that high brightness may be obtained while limiting light emitted at a cutoff angle or more. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The illustrative and non-limiting exemplary embodiments will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

[0030] Figure 1 is a cross-sectional view illustrating an optical sheet according to an exemplary embodiment.

[0031] Figure 2 is a cross-sectional view illustrating an optical sheet according to other exemplary embodiments.

[0032] Figure 3 is a cross-sectional view illustrating an optical sheet according to an exemplary embodiment.

[0033] Figure 4 yes Figure 3 An enlarged cross-sectional view of portion A.

[0034] Figure 5 According to other exemplary embodiments Figure 3 An enlarged cross-sectional view of portion A.

[0035] Figure 6 is a cross-sectional view illustrating an optical sheet according to other exemplary embodiments.

[0036] Figure 7 yes Figure 6 An enlarged cross-sectional view of portion B.

[0037] Figure 8 is a cross-sectional view showing a display device according to an exemplary embodiment.

[0038] Fig. 9 It is shown Figure 8 A perspective view of the viewing angle of the display device.

[0039] Fig.10 The transmittance of the optical sheet is shown relative to the viewing angle. Figure 8 A graph of the cut-off angle of the display device.

[0040] Fig.11A is a diagram showing an example in which a display device of the related art is applied to a vehicle center meter monitor.

[0041] Fig. 11B is a diagram showing an example in which the display device according to the exemplary embodiment is applied to a vehicle center meter monitor.

[0042] Fig.12 is a cross-sectional view illustrating an optical sheet according to an exemplary embodiment.

[0043] Fig.13 is a cross-sectional view illustrating an optical sheet according to other exemplary embodiments.

[0044] Fig.14A and Fig. 14B is a cross-sectional view illustrating an optical sheet to which an anti-reflection function is added according to an exemplary embodiment.

[0045] Fig.15A , Fig. 15B , Fig. 15C , Fig.15D , Fig.15E , Fig.15F and Figure 15G It shows the manufacturing Figure 1 Cross-sectional view of the optical sheet method.

[0046] Fig.16A , Fig. 16B , Fig. 16C and Fig.16D It shows the manufacturing Figure 3 and Figure 4 Cross-sectional view of the optical sheet method.

[0047] Fig.17A , Fig. 17B , Fig. 17C and Fig.17D It shows the manufacturing Figure 5 Cross-sectional view of the optical sheet method.

[0048] Fig.18 is a block diagram illustrating an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0049] Hereinafter, the exemplary embodiments of the inventive concept will be explained in detail with reference to the accompanying drawings. It will be understood that when an element is referred to as "on" other elements, the element can be directly on the other elements or there can be an intervening element between them. On the contrary, when an element is referred to as "directly" "on" other elements, there is no intervening element. It will be understood that although the terms "first", "second", "third", etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or section from other elements, components, regions, layers or sections. Therefore, without departing from the teachings of this article, the first "element", "component", "region", "layer" or "section" discussed below can be referred to as the second "element", "component", "region", "layer" or "section". The professional terms used herein are only for the purpose of describing specific embodiments, and are not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms "one" and "the" are intended to include plural forms containing "at least one". "At least one" should not be interpreted as limited to "one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will also be understood that the term "including", when used in this specification, specifically describes the existence of the stated features, regions, integers, steps, operations, elements and / or parts, but does not exclude the existence or addition of one or more other features, regions, integers, steps, operations, elements, parts and / or their groups. In addition, relational terms such as "lower" or "bottom" and "upper" or "top" can be used in this article to describe the relationship between an element and other elements as shown in the figure. It will be understood that in addition to the orientation depicted in the figure, the relational terms are also intended to cover different orientations of the device. For example, if the device in one figure is flipped, the element described as the "lower" side of the other elements will be oriented to the "upper" side of the other elements. Therefore, depending on the specific orientation of the figure, the exemplary term "lower" can cover the orientation of both "lower" and "upper". Similarly, if the device in one figure is flipped, the element described as "below" or "below" the other elements will be oriented to be "above" the other elements. Thus, the exemplary terms "below" or "beneath" can encompass both an orientation of above and below.

[0050] Figure 1 is a cross-sectional view illustrating an optical sheet according to an exemplary embodiment.

[0051] Reference Figure 1 , the optical sheet may include a base film 100 , a first wedge layer 110 , a second wedge layer 130 , and a light blocking pattern 120 .

[0052] The base film 100 may include a transparent insulating material. For example, the base film 100 may be formed of or include plastic having excellent heat resistance and durability, such as polyimide, polyethylene terephthalate (PET), polycarbonate, polyethylene naphthalate, polyarylate (PAR), and polyetherimide.

[0053] Although not shown, an adhesive may be applied to the lower surface of the base film 100 so that the base film 100 can be attached to the display panel (refer to FIG. Figure 8 Alternatively, the first wedge layer 110 and the second wedge layer 130 may be directly disposed on the display panel without the base film 100 (eg, directly disposed on a thin film encapsulation layer of the display panel).

[0054] The first wedge layer 110 may be disposed on the base film 100. An upper surface of the first wedge layer 110 may have a wedge-shaped prism pattern.

[0055] Each wedge-shaped prism pattern of the first wedge layer 110 may include an inclined surface 112 forming an inclined angle θ relative to a plane defined by the first direction D1 and the second direction D2, and a vertical surface 114 connected to the inclined surface 112 and extending in a third direction D3 perpendicular to the first direction D1 and the second direction D2. Here, the second direction D2 is perpendicular to the first direction D1. In addition, the inclined surface 112 may have an inclined angle θ relative to the second direction D2, the wedge-shaped prism patterns of the first wedge layer 110 may be arranged in the second direction D2, and each wedge-shaped prism pattern may extend in the first direction D1. The distance between two adjacent vertical surfaces 114 may be defined as a pitch of the prism pattern, and the length of the vertical surface 114 in the third direction D3 may be defined as the height of the prism pattern.

[0056] The first wedge layer 110 may include a material having a first refractive index.

[0057] The second wedge layer 130 may be disposed on the first wedge layer 110 to have a lower surface corresponding to the wedge-shaped prism pattern of the first wedge layer 110. The second wedge layer 130 may include a material having a second refractive index greater than the first refractive index.

[0058] The light blocking pattern 120 may be disposed between the first wedge layer 110 and the second wedge layer 130 and disposed on the vertical surface 114 of the first wedge layer 110. The light blocking pattern 120 may include a material that blocks light. For example, the light blocking pattern 120 may include an organic light blocking material containing carbon black, or may include an inorganic light blocking material such as a metal oxide.

[0059] The lower surface 124 of the light blocking pattern 120 in contact with the inclined surface 112 may be an inclined surface to form an inclined angle θ with respect to a surface defined by the first direction D1 and the second direction D2 so as to be parallel to the inclined surface 112. In other words, the side surface 122 of the light blocking pattern 120 may be in contact with the vertical surface 114, and the lower surface 124 may be in contact with the inclined surface 112.

[0060] Accordingly, a plurality of inclined surfaces 112 and vertical surfaces 114 may be disposed between the first wedge layer 110 and the second wedge layer 130 , and the light blocking pattern 120 may be disposed on the vertical surfaces 114 and between the first wedge layer 110 and the second wedge layer 130 .

[0061] An upper surface of the light blocking pattern 120 facing the lower surface 124 may be parallel to a plane defined by the first direction D1 and the second direction D2.

[0062] The first wedge layer 110 has a first refractive index, and the second wedge layer 130 has a second refractive index. By appropriately changing the first and second refractive indices, the tilt angle θ, and the pitch and height of the wedge-shaped prism pattern, the cutoff angle θc can be adjusted. The cutoff angle θc refers to the maximum angle of light emitted from the optical sheet relative to the third direction D3.

[0063] Table 1 below shows various examples of the pitch, the second refractive index, the first refractive index, the height, and the tilt angle when the cut-off angle is 30 degrees or 40 degrees.

[0064]

[0065]

[0066] In other words, the first wedge layer 110, the second wedge layer 130, and the light blocking pattern 120 may be used to adjust the path of emitted light, and may be used to block light emitted to the outside of the optical sheet in a direction higher than a cutoff angle θc with respect to the third direction D3 (see Figure 3 , Fig. 9 and Fig.10 ). For example, Figure 3 As shown in FIG, in the first wedge layer 110, at an angle of inclination θ or more relative to a surface defined by the first direction D1 and the second direction D2, light (e.g., La, Lb, and Lc) may be emitted to the outside of the optical sheet. However, in the first wedge layer 110, at an angle less than the inclination angle θ, light (e.g., Ld) may be blocked by the light blocking structure 200.

[0067] Figure 2 is a cross-sectional view illustrating an optical sheet according to other exemplary embodiments.

[0068] Reference Figure 2 In addition to the base film 100 being disposed on the second wedge layer 130 and the upper surface 126 of the light blocking pattern 120 being inclined, the optical sheet is Figure 1 The optical sheets of FIG. 1 and FIG. 2 are substantially the same. Accordingly, repeated descriptions will be simplified or omitted.

[0069] The optical sheet may include a first wedge layer 110 , a second wedge layer 130 , a light blocking pattern 120 , and a base film 100 .

[0070] The upper surface of the first wedge layer 110 may have a wedge-shaped prism pattern. The first wedge layer 110 may include a material having a first refractive index.

[0071] Although not shown, an adhesive may be applied to the lower surface of the first wedge layer 110 so that the first wedge layer 110 may be attached to the display panel 20 (see FIG. 2 ). Figure 8 ).

[0072] The second wedge layer 130 may be disposed on the first wedge layer 110 to have a lower surface corresponding to the wedge-shaped prism pattern of the first wedge layer 110. The second wedge layer 130 may include a material having a second refractive index greater than the first refractive index. The first wedge layer 110 may include an inclined surface 112 forming an inclined angle θ with respect to a plane defined by the first direction D1 and the second direction D2, and a vertical surface 114 connected to the inclined surface 112 and extending in a third direction D3 perpendicular to the first direction D1 and the second direction D2.

[0073] The light blocking pattern 120 may be disposed between the first wedge layer 110 and the second wedge layer 130 and disposed on the vertical surface 114 of the first wedge layer 110 .

[0074] The upper surface 126 of the light blocking pattern 120 contacting the inclined surface 112 of the first wedge layer 110 may be an inclined surface to form an inclined angle θ with respect to a surface defined by the first direction D1 and the second direction D2 so as to be parallel to the inclined surface 112. In other words, the side surface 122 of the light blocking pattern 120 may contact the vertical surface 114, and the upper surface 126 may contact the inclined surface 112.

[0075] A lower surface of the light blocking pattern 120 facing the upper surface 126 may be parallel to a plane defined by the first direction D1 and the second direction D2.

[0076] According to this exemplary embodiment, although the optical sheet is described as including the base film 100 in contact with the second wedge layer 130, the present invention is not limited thereto. In other exemplary embodiments, for example, Figure 1Like the optical sheet of the present invention, a lower base film disposed on the lower surface of the first wedge layer 110 may be further included. In this case, the adhesive layer on the lower base film may be attached to the display panel.

[0077] Figure 3 is a cross-sectional view showing an optical sheet according to an exemplary embodiment, and Figure 4 yes Figure 3 An enlarged cross-sectional view of portion A.

[0078] Reference Figure 3 and Figure 4 In addition to the light blocking structure 200, the optical sheet may be Figure 1 Therefore, repeated descriptions will be simplified or omitted.

[0079] The optical sheet may include a base film 100 , a first wedge layer 110 , a second wedge layer 130 , and a light blocking structure 200 .

[0080] The base film 100 may include a transparent insulating material.

[0081] The first wedge layer 110 may be disposed on the base film 100. The upper surface of the first wedge layer 110 may have a wedge-shaped prism pattern. Each wedge-shaped prism pattern of the first wedge layer 110 may include an inclined surface 112 forming an inclined angle θ with respect to a plane defined by the first direction D1 and the second direction D2, and a vertical surface 114 connected to the inclined surface 112 and extending in a third direction D3 perpendicular to the first direction D1 and the second direction D2. The first wedge layer 110 may include a material having a first refractive index.

[0082] The second wedge layer 130 may be disposed on the first wedge layer 110 to have a lower surface corresponding to the wedge-shaped prism pattern of the first wedge layer 110. The second wedge layer 130 may include a material having a second refractive index greater than the first refractive index.

[0083] The light blocking structure 200 may include a plurality of thin films, each of which has a thickness of about 1 micrometer (μm) or less.

[0084] The light blocking structure 200 may be disposed between the first wedge layer 110 and the second wedge layer 130 and disposed on the vertical surface 114 of the first wedge layer 110. The light blocking structure 200 may include a first layer 210, a first insulating layer 220, and a second layer 230.

[0085] The first layer 210 may include a first portion disposed on the vertical surface 114 of the first wedge layer 110 and a second portion disposed on the inclined surface 112. The first layer 210 may have a first thickness t1 in the second direction D2. The first layer 210 may include a metal. For example, the first layer 210 may be formed of any one or an alloy of at least two selected from the group consisting of the following metals, or include any one or an alloy of at least two selected from the group consisting of the following metals: aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), ytterbium (Yb) and manganese (Mn). However, the present invention is not limited thereto.

[0086] The second layer 230 may be disposed to be spaced apart from the first layer 210 so as to be parallel to the vertical surface 114 while in contact with the second wedge layer 130. The second layer 230 may have a second thickness t2 less than the first thickness t1 in the second direction D2. The second layer 230 may include a metal. For example, the second layer 230 may be formed of any one or an alloy of at least two selected from the group consisting of the following metals, or include any one or an alloy of at least two selected from the group consisting of the following metals: aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), ytterbium (Yb) and manganese (Mn). However, the present invention is not limited thereto.

[0087] The first insulating layer 220 may be disposed between the first layer 210 and the second layer 230. The first insulating layer 220 may be formed of any one or at least two selected from the group consisting of the following materials, or include a compound formed by mixing any one or at least two selected from the group consisting of the following materials: SiO 2 、TiO 2 、ZrO 2 、 2 O 5 , HfO 2 、Al 2 O 3 , ZnO, Y 2 O 3 , BeO, MgO, PbO 2 , WO 3 , VO X 、SiN X , eNX, AlN, ZnS, CdS, SiC, SiCN, MgF, CaF 2 , NaF, BaF2 , PbF 2 、LiF、LaF 3 , GaP and AlO x However, the present invention is not limited thereto.

[0088] The first layer 210 may be thicker than the second layer 230 so that the first layer 210 may not transmit light, or at least may have a transmittance lower than that of the second layer 230. In addition, since the second layer 230 is thinner than the first layer 210, some light L2 may be transmitted through the second layer 230. The thicknesses of the first layer 210, the second layer 230, and the first insulating layer 220 in the second direction D2 may be set so that the light L2 transmitted through the second layer 230 and reflected by the first layer 210 may cause destructive interference with the light L1 reflected by the second layer 230. Accordingly, the reflected light L1 and the light L2 may be eliminated by the light blocking structure 200, and the emitted light having an angle greater than the cut-off angle θc may be blocked by the optical sheet due to the prism pattern formed by the inclined surface 112.

[0089] Although not shown, an adhesive may be applied to the lower surface of the base film 100 so that the base film 100 can be attached to the display panel (see FIG. Figure 8 on a display panel 20).

[0090] Figure 5 According to other exemplary embodiments Figure 3 An enlarged cross-sectional view of portion A.

[0091] Reference Figure 5 In addition to the light blocking structure 200_1, the optical sheet may be Figure 3 and Figure 4 Therefore, repeated descriptions will be simplified or omitted.

[0092] The optical sheet may include a base film 100 , a first wedge layer 110 , a second wedge layer 130 , and a light blocking structure 200_1 .

[0093] The base film 100 may include a transparent insulating material.

[0094] The first wedge layer 110 may be disposed on the base film 100. The upper surface of the first wedge layer 110 may have a wedge-shaped prism pattern. Each wedge-shaped prism pattern of the first wedge layer 110 may include an inclined surface 112 forming an inclined angle θ with respect to a plane defined by the first direction D1 and the second direction D2, and a vertical surface 114 connected to the inclined surface 112 and extending in a third direction D3 perpendicular to the first direction D1 and the second direction D2. The first wedge layer 110 may include a material having a first refractive index.

[0095] The second wedge layer 130 may be disposed on the first wedge layer 110 to have a lower surface corresponding to the wedge-shaped prism pattern of the first wedge layer 110. The second wedge layer 130 may include a material having a second refractive index greater than the first refractive index.

[0096] The light blocking structure 200_1 may include a plurality of thin films, each of which has a thickness of about 1 μm or less.

[0097] The light blocking structure 200_1 may be disposed between the first and second wedge layers 110 and 130 and on the vertical surface 114 of the first wedge layer 110. The light blocking structure 200_1 may include a first layer 210_1, a first insulating layer 220_1, a second layer 230_1, a second insulating layer 240, and a third layer 250.

[0098] The first layer 210_1 may include a first portion disposed on the vertical surface 114 of the first wedge layer 110 and a second portion disposed on the inclined surface 112. The first layer 210_1 may have a first thickness t1_1 in the second direction D2. The first layer 210_1 may include a metal. For example, the first layer 210_1 may be formed of any one or an alloy of at least two selected from the group consisting of the following metals, or include any one or an alloy of at least two selected from the group consisting of the following metals: aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), ytterbium (Yb) and manganese (Mn). However, the present invention is not limited thereto.

[0099] The second layer 230_1 may be disposed to be separated from the first layer 210_1 and include a first portion parallel to the vertical surface 114 and a second portion parallel to the inclined surface 112. The second layer 230_1 may have a second thickness t2_1 greater than the first thickness t1_1. The second layer 230_1 may include a metal. For example, the second layer 230_1 may be formed of any one or at least two alloys selected from the group consisting of the following metals, or include any one or at least two alloys selected from the group consisting of the following metals: aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), ytterbium (Yb) and manganese (Mn). However, the present invention is not limited thereto.

[0100] The first insulating layer 220_1 may be disposed between the first layer 210_1 and the second layer 230_1. The first insulating layer 220_1 may be formed of any one or at least two selected from the group consisting of the following materials, or include a compound formed by mixing any one or at least two selected from the group consisting of the following materials: SiO 2 、TiO 2 、ZrO 2 、 2 O 5 , HfO 2 、Al 2 O 3 , ZnO, Y 2 O 3 , BeO, MgO, PbO 2 , WO 3 , VO X 、SiN X , eNX, AlN, ZnS, CdS, SiC, SiCN, MgF, CaF 2 , NaF, BaF 2 , PbF 2 、LiF、LaF 3 , GaP and AlO x However, the present invention is not limited thereto.

[0101] The third layer 250 may be disposed to be spaced apart from the second layer 230_1 so as to be parallel to the vertical surface 114 while contacting the second wedge layer 130. The third layer 250 may have a third thickness t3 less than the second thickness t2_1 in the second direction D2. The third layer 250 may include a metal. For example, the third layer 250 may be formed of any one or an alloy of at least two selected from the group consisting of the following metals, or include any one or an alloy of at least two selected from the group consisting of the following metals: aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), ytterbium (Yb) and manganese (Mn). However, the present invention is not limited thereto.

[0102] The second insulating layer 240 may be disposed between the second layer 230_1 and the third layer 250. The second insulating layer 240 may be formed of any one or at least two selected from the group consisting of the following materials, or include a compound formed by mixing any one or at least two selected from the group consisting of the following materials: SiO 2 、TiO 2 、ZrO 2 、 2 O5 , HfO 2 、Al 2 O 3 , ZnO, Y 2 O 3 , BeO, MgO, PbO 2 , WO 3 , VO X 、SiN X , eNX, AlN, ZnS, CdS, SiC, SiCN, MgF, CaF 2 , NaF, BaF 2 , PbF 2 、LiF、LaF 3 , GaP and AlO x However, the present invention is not limited thereto.

[0103] The second layer 230_1 may be thicker than each of the first layer 210_1 and the third layer 250, so that the second layer 230_1 may not transmit light, or at least may have a transmittance lower than that of each of the first layer 210_1 and the third layer 250. In addition, since each of the third layer 250 and the first layer 210_1 is thinner than the second layer 230_1, some light L2_1 may be transmitted through the first layer 210_1, and some light L4 may be transmitted through the third layer 250. The thicknesses of the first layer 210_1, the second layer 230_1, the third layer 250, the first insulating layer 220_1, and the second insulating layer 240 in the second direction D2 may be set so that the light L2_1 transmitted through the first layer 210_1 and reflected by the second layer 230_1 may cause destructive interference with the light L1_1 reflected by the first layer 210_1, and the light L4 transmitted through the third layer 250 and reflected by the second layer 230_1 may cause destructive interference with the light L3 reflected by the third layer 250. Accordingly, the reflected light L1_1 and light L2_1 and the reflected light L3 and light L4 may be eliminated by the light blocking structure 200_1, and have a cut-off angle greater than 0.04 (see FIG. 2 ). Figure 3 Emitted light at an angle of a cutoff angle θc) may be blocked by the optical sheet due to the prism pattern formed by the inclined surface 112.

[0104] although Figure 5 An example in which the light blocking structure 200_1 has a flat upper side and an inclined lower side is shown, but this may vary depending on the order and characteristics of a manufacturing process.

[0105] In addition, despite Figure 5 The light blocking structure 200_1 is shown to have a five-layer structure, but this is only an example. In other exemplary embodiments, various stacked structures such as a six-layer structure or a seven-layer structure may also be implemented.

[0106] Figure 6 is a cross-sectional view showing an optical sheet according to other exemplary embodiments, and Figure 7 yes Figure 6 An enlarged cross-sectional view of portion B.

[0107] Reference Figure 6 and Figure 7 In addition to the light blocking structure 200_2, the optical sheet may be Figure 2 The optical sheets of FIG. 1 and FIG. 2 are substantially the same. Accordingly, repeated descriptions will be simplified or omitted.

[0108] Reference Figure 6 and Figure 7 , the optical sheet may include a first wedge layer 110 , a second wedge layer 130 , a light blocking structure 200_2 , and a base film 100 .

[0109] The upper surface of the first wedge layer 110 may have a wedge-shaped prism pattern. The first wedge layer 110 may include a material having a first refractive index.

[0110] The second wedge layer 130 may be disposed on the first wedge layer 110 to have a lower surface corresponding to the wedge-shaped prism pattern of the first wedge layer 110. The second wedge layer 130 may include a material having a second refractive index greater than the first refractive index. The first wedge layer 110 may include an inclined surface 112 forming an inclined angle θ with respect to a plane defined by the first direction D1 and the second direction D2, and a vertical surface 114 connected to the inclined surface 112 and extending in a third direction D3 perpendicular to the first direction D1 and the second direction D2. The base film 100 may be disposed on the second wedge layer 130.

[0111] The light blocking structure 200_2 may include a plurality of thin films, each of which has a thickness of about 1 μm or less.

[0112] The light blocking structure 200_2 may be disposed between the first wedge layer 110 and the second wedge layer 130 and disposed on the vertical surface 114 of the first wedge layer 110. The light blocking structure 200_2 may include a first layer 210_2, a first insulating layer 220_2, and a second layer 230_2.

[0113] The first layer 210_2 may be disposed on the vertical surface 114 of the first wedge layer 110. The first layer 210_2 may have a first thickness t1. The first layer 210_2 may include a metal. For example, the first layer 210_2 may be formed of any one or an alloy of at least two selected from the group consisting of the following metals, or include any one or an alloy of at least two selected from the group consisting of the following metals: aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), ytterbium (Yb) and manganese (Mn). However, the present invention is not limited thereto.

[0114] The second layer 230_2 may be disposed to be separated from the first layer 210_2, and include a first portion disposed on the second wedge layer 130 while being parallel to the vertical surface 114 and a second portion that is consistent with the inclined surface 112. That is, the second portion is parallel to the inclined surface 112. The second layer 230_2 may have a second thickness t2 that is less than the first thickness t1. The second layer 230_2 may include a metal. For example, the second layer 230_2 may be formed of any one or an alloy of at least two selected from the group consisting of the following metals, or include any one or an alloy of at least two selected from the group consisting of the following metals: aluminum (Al), silver (Ag), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), gold (Au), tantalum (Ta), copper (Cu), calcium (Ca), cobalt (Co), iron (Fe), molybdenum (Mo), tungsten (W), platinum (Pt), ytterbium (Yb) and manganese (Mn). However, the present invention is not limited thereto.

[0115] The first insulating layer 220_2 may be disposed between the first layer 210_2 and the second layer 230_2. The first insulating layer 220_2 may be formed of any one or at least two selected from the group consisting of the following materials, or include a compound formed by mixing any one or at least two selected from the group consisting of the following materials: SiO 2 、TiO 2 、ZrO 2 、 2 O 5 , HfO 2 、Al 2 O 3 , ZnO, Y 2 O 3 , BeO, MgO, PbO 2 , WO 3 , VO X 、SiN X, eNX, AlN, ZnS, CdS, SiC, SiCN, MgF, CaF 2 , NaF, BaF 2 , PbF 2 、LiF、LaF 3 , GaP and AlO x However, the present invention is not limited thereto.

[0116] like Figure 4 In the description, the light blocking structure 200_2 may cause destructive interference, and a detailed description thereof will be omitted.

[0117] Although not shown, an adhesive may be applied to the lower surface of the first wedge layer 110 so that the first wedge layer 110 may be attached to the display panel 20 (see FIG. 2 ). Figure 8 on a display panel 20).

[0118] Figure 8 is a cross-sectional view showing a display device according to an exemplary embodiment, and Fig. 9 It is shown Figure 8 A perspective view of the viewing angle of the display device.

[0119] Reference Figure 8 and Fig. 9 , the display device may include an optical sheet 10 and a display panel 20. Figure 8 As shown in FIG. 1 , the optical sheet 10 may be attached to the front surface of the display panel 20. For example, the optical sheet 10 may be Figures 1 to 7 The optical sheet described in .

[0120] The display panel 20 may display an image. For example, the display panel 20 may include an organic light emitting display panel, a liquid crystal display panel, or the like. The display panel 20 may emit light in a third direction D3 perpendicular to the first direction D1 and the second direction D2.

[0121] The optical sheet 10 may be disposed on the front surface of the display panel 20, and may block light emitted in an oblique direction at an angle greater than or equal to a cutoff angle θc inclined from the third direction D3 toward the second direction D2. Accordingly, when viewed from the upper side of the display device (i.e., viewed in a direction opposite to the third direction D3), light emitted from the display panel 20 at an angle greater than or equal to the cutoff angle θc may not be recognized by a user.

[0122] Fig.10 The transmittance of the optical sheet 10 is shown relative to the viewing angle. Figure 8 A graph of the cut-off angle θc of a display device.

[0123] Reference Figures 8 to 10, the transmittance of the optical sheet 10 of the display device indicates that light emitted at an angle of about 31 degrees or more in the second direction D2 relative to the third direction D3 is blocked. Accordingly, a display device configured to limit light emission at a cutoff angle or more can be obtained.

[0124] In addition, since the optical sheet 10 has the light blocking pattern formed on the vertical surface, the aperture ratio of the display device in the third direction D3 as a whole can be high. Accordingly, according to the present invention, high brightness can be obtained while blocking light emitted at a cutoff angle or more.

[0125] Fig.11A is a diagram showing an example in which a display device of the related art is applied to a vehicle center meter monitor.

[0126] Reference Fig.11A During nighttime driving, light emitted from a display device may be reflected on the front glass (e.g., windshield) of a car and interfere with the driver's field of view. When a conventional viewing angle control sheet having a louver structure with a high aspect ratio is used to prevent this phenomenon, brightness loss occurs, and thus the brightness of the display device may be reduced, and display quality may be deteriorated.

[0127] Fig. 11B is a diagram showing an example in which the display device according to the exemplary embodiment is applied to a vehicle center meter monitor.

[0128] Reference Fig. 11B The display device limits light emission at a cutoff angle or greater (i.e., limits light emitted toward the front glass), thereby preventing light emitted from the display device from being reflected on the front glass of the car, so that the driver's viewing of the front glass can be ensured during night driving.

[0129] In addition, since the optical sheet of the display device has the light blocking pattern formed on the vertical surface, the aperture ratio as a whole can be high, and high brightness can be obtained while limiting light emitted at an angle of a cutoff angle or more by refraction of light emitted from the inclined surface formed by the first wedge-shaped layer and the second wedge-shaped layer. The light blocking pattern can prevent the formation of a ghost image by blocking the light path traveling to the vertical surface while blocking light emitted at an angle of a cutoff angle or more.

[0130] Furthermore, as described above, the cutoff angle can be adjusted to a desired angle by adjusting the refractive index, the inclination angle, the interval, and the height of the inclined surfaces of the first and second wedge-shaped layers of the optical sheet.

[0131] Fig.12 is a cross-sectional view illustrating an optical sheet according to an exemplary embodiment.

[0132] Reference Fig.12 The optical sheet may include a first wedge layer 110 , a second wedge layer 130 , a first light blocking pattern 120 , a third wedge layer 310 , a fourth wedge layer 330 , and a second light blocking pattern 320 .

[0133] The first wedge layer 110 may have a first refractive index and include a wedge-shaped prism pattern including a first inclined surface having a first inclined angle θ with respect to the second direction D2 and a first vertical surface extending in a third direction D3 perpendicular to the first and second directions D1 and D2.

[0134] The second wedge layer 130 may be disposed on the first wedge layer 110 , and may have a second refractive index greater than the first refractive index.

[0135] The first light blocking pattern 120 may be disposed between the first and second wedge layers 110 and 130, and may include a first surface contacting the first vertical surface of the first wedge layer 110 and a second surface inclined to form an inclined angle with respect to a plane defined by the first and second directions D1 and D2 while contacting the first inclined surface.

[0136] The third wedge layer 310 may be disposed on the second wedge layer 130. The third wedge layer 310 may have a third refractive index and include a wedge-shaped prism pattern including a second inclination angle θ′ (e.g., as shown in FIG. 1 ) that is inclined relative to the plane in a direction different from the inclination angle of the first wedge layer 110. Fig.12 , and a second vertical surface extending in the third direction D3. In this case, the first inclination angle θ and the second inclination angle θ' may have the same magnitude. Accordingly, as Fig.12 As shown in , the same cutoff angle θc with respect to the third direction D3 can be achieved at both the left and right sides.

[0137] The fourth wedge layer 330 may be disposed on the third wedge layer 310 and may have a fourth refractive index greater than the third refractive index.

[0138] The second light blocking pattern 320 may be disposed between the third wedge layer 310 and the fourth wedge layer 330, and may include a first surface contacting the second vertical surface of the third wedge layer 310 and a second surface inclined to form an inclined angle with respect to a plane defined by the first direction D1 and the second direction D2 while contacting the second inclined surface.

[0139] The optical sheet may be manufactured by forming the first wedge layer 110 and the second wedge layer 130 , forming the third wedge layer 310 and the fourth wedge layer 330 , and then combining the above two sets of formed layers.

[0140] The above exemplary embodiment provides the following configuration by laminating two sheets (the first wedge layer 110 and the second wedge layer 130 are formed into one sheet, and the third wedge layer 310 and the fourth wedge layer 330 are formed into one sheet). Fig.12 , an optical sheet configured to limit the emitted light tilted to the left and right directions (i.e., the second direction and the opposite direction thereof) is shown, and each of the two sheets includes a light blocking pattern. However, the present invention is not limited thereto. In other exemplary embodiments, the emission angle in each direction can be limited by using several sheets.

[0141] According to a method of manufacturing the optical sheet, one of the upper and lower surfaces of each of the first and second light blocking patterns 120 and 320 may be flat, and the other may be inclined. Fig.12 It is shown that the first light blocking pattern 120 has an inclined lower surface and a flat upper surface, and the second light blocking pattern 320 has a flat lower surface and an inclined upper surface. However, the present invention is not limited thereto.

[0142] Although not shown, an adhesive may be applied to the lower surface of the first wedge layer 110 so that the first wedge layer 110 may be attached to the display panel 20 (see FIG. 2 ). Figure 8 on a display panel 20).

[0143] Fig.13 is a cross-sectional view illustrating an optical sheet according to other exemplary embodiments.

[0144] Reference Fig.13 , except that the first pitch P1 of the prism pattern of the first wedge layer 110 and the second pitch P2 of the prism pattern of the third wedge layer 310 are different from each other, and the first tilt angle θ1 of the prism pattern of the first wedge layer 110 and the second tilt angle θ2 of the prism pattern of the third wedge layer 310 are different from each other, the optical sheet is Fig.12 The optical sheets are substantially the same. Therefore, the first cut-off angle θc1 and the second cut-off angle θc2 are different from each other. A repeated description will be omitted.

[0145] Fig.14A and Fig. 14B 1 is a cross-sectional view showing an optical sheet to which an anti-reflection function is added according to an exemplary embodiment. In addition to the anti-reflection layer 125 for the anti-reflection function and the uneven portion 112a (eg, a square wave pattern), the optical sheet is Figure 1 The optical sheets of FIG. 1 and FIG. 2 are substantially the same. Accordingly, repeated descriptions will be omitted.

[0146] Reference Fig.14A The optical sheet may further include an anti-reflection layer 125 , and the anti-reflection layer 125 is disposed between the first wedge layer 110 and the second wedge layer 130 and on the inclined surface 112 of the first wedge layer 110 .

[0147] The anti-reflection layer 125 may include various types of known anti-reflection films. For example, the anti-reflection layer 125 may have a structure in which a high refractive index layer and a low refractive index layer are sequentially stacked.

[0148] Reference Fig. 14B , the optical sheet may have an uneven portion 112a defined by the inclined surface 112 of the first wedge layer 110. Light reflection at the interface between the first wedge layer 110 and the second wedge layer 130 may be reduced due to the uneven portion 112a.

[0149] The above exemplary embodiments illustrate that the anti-reflection layer 125 or the uneven portion 112a is formed in order to improve the transmittance of the optical sheet. However, the present invention is not limited thereto, and in other exemplary embodiments, the optical sheet may further include various anti-reflection structures.

[0150] FIG. 15A to FIG. 15G It shows the manufacturing Figure 1 Cross-sectional view of the optical sheet method.

[0151] Reference Fig.15A , a resin layer 110 a having a first refractive index may be formed on the base film 100 .

[0152] Reference Fig. 15B After forming the inclined surface 112 and the vertical surface 114 having an inclination angle θ relative to the main surface (i.e., the plane defined by the first direction D1 and the second direction D2) of the base film 100 on the resin layer 110a by using a mold or the like, the resin layer 110a may be cured. Accordingly, the first wedge-shaped layer 110 including a wedge-shaped prism pattern including the inclined surface 112 and the vertical surface 114 may be formed.

[0153] Reference Fig. 15C , a light blocking layer 120a may be formed on the first wedge layer 110. The light blocking layer 120a may include a light blocking material and may be formed on the inclined surface 112 and the vertical surface 114 of the first wedge layer 110. Since it is preferable to uniformly form the light blocking layer 120a on the inclined surface 112 and the vertical surface 114, a conformal deposition process may be used.

[0154] Reference Fig.15D, a planarization layer PL may be formed on the light blocking layer 120a, and a mask pattern MP may be formed on the planarization layer PL. The upper surface of the planarization layer PL may be planarized. The mask pattern MP may be formed using various known schemes. For example, a photoresist may be formed on the planarization layer PL, exposed, and developed so that the mask pattern MP may be formed.

[0155] Reference Fig.15E , a portion of the planarization layer PL and a portion of the light blocking layer 120a may be etched by using the mask pattern MP as an etching barrier. Accordingly, the inclined surface of the first wedge layer 110 may be exposed. Since a portion of the light blocking layer 120a disposed under the mask pattern MP needs to be retained without being removed, the light blocking layer 120a may be etched by using an anisotropic etching process.

[0156] Reference Fig.15F , the light blocking pattern 120 may be formed by removing the remaining portion of the mask pattern MP, the planarization layer PL, and the light blocking layer 120a. Accordingly, the light blocking pattern 120 may include a first surface in contact with the vertical surface of the first wedge layer 110 and a second surface inclined to form an inclined angle with respect to a plane while in contact with the inclined surface of the first wedge layer 110.

[0157] Reference Figure 15G , the second wedge-shaped layer 130 having a second refractive index greater than the first refractive index may be formed on the first wedge-shaped layer 110 formed with the light blocking pattern 120. Thus, the optical sheet may be manufactured.

[0158] FIG. 16A to FIG. 16D It shows the manufacturing Figure 3 and Figure 4 In addition to forming the light blocking structure 200, the manufacturing method is similar to FIG. 15A to FIG. 15G The manufacturing method of is basically the same. Accordingly, repeated description will be omitted.

[0159] Reference Fig.16A , a first wedge-shaped layer 110 having a first refractive index may be formed on the base film 100. The first wedge-shaped layer 110 may include a wedge-shaped prism pattern including an inclined surface 112 and a vertical surface 114.

[0160] The first raw material layer 210a may be formed on the inclined surface 112 and the vertical surface 114 of the first wedge layer 110. Since it is preferred that the first raw material layer 210a is uniformly formed on the inclined surface 112 and the vertical surface 114, a conformal deposition process may be used.

[0161] The first material layer 210a may be formed by using sputtering, chemical vapor deposition (CVD), physical vapor deposition (PVD), electron beam, thermal evaporation, thermal ion beam assisted deposition (IBAD), or the like, but the present invention is not limited thereto.

[0162] Reference Fig. 16B , the first raw material insulating layer 220a may be formed on the first raw material layer 210a. The first raw material insulating layer 220a may be formed by using spin coating, spray coating, screen printing, inkjet, coating, or the like, but the present invention is not limited thereto. In other exemplary embodiments, the first raw material insulating layer 220a may be formed by using sputtering, chemical vapor deposition (CVD), plasma chemical vapor deposition (PEVD), thermal evaporation, thermal ion beam assisted deposition (IBAD), atomic layer deposition (ALD), or the like.

[0163] The second material layer 230a may be formed on the first material insulating layer 220a. Since it is preferred that the second material layer 230a is uniformly formed on the inclined surface 112 and the vertical surface 114, a conformal deposition process may be used.

[0164] The second raw material layer 230 a may be formed by using sputtering, chemical vapor deposition (CVD), physical vapor deposition (PVD), electron beam, thermal evaporation, thermal ion beam assisted deposition (IBAD), or the like, but the present invention is not limited thereto.

[0165] Reference Fig. 16C The second raw material layer 230a, the first raw material insulating layer 220a and the first raw material layer 210a can be etched to form a first layer, a first insulating layer and a second layer (see Fig.16D Since part of the light blocking structure 200 needs to be retained without being removed, the second raw material layer 230a, the first raw material insulating layer 220a and the first raw material layer 210a may be etched by using an anisotropic etching process.

[0166] Reference Fig.16D, the second wedge-shaped layer 130 having a second refractive index greater than the first refractive index may be formed on the first wedge-shaped layer 110 formed with the light blocking structure 200. Thus, the optical sheet may be manufactured.

[0167] FIG. 17A to FIG. 17D It shows the manufacturing Figure 5 Cross-sectional view of the optical sheet method.

[0168] The manufacturing method is similar to that of FIG. 16A to FIG. 16D The manufacturing method of is basically the same. Accordingly, repeated description will be omitted.

[0169] Reference Fig.17A , a first wedge-shaped layer 110 having a first refractive index may be formed on the base film 100. The first wedge-shaped layer 110 may include a wedge-shaped prism pattern including an inclined surface 112 and a vertical surface 114.

[0170] Reference Fig. 17B , a first raw material layer 210 a , a first raw material insulating layer 220 a , a second raw material layer 230 a , a second raw material insulating layer 240 a , and a third raw material layer 250 a may be sequentially formed on the first wedge layer 110 .

[0171] Reference Fig. 17C , a light blocking structure 200_1 including a first layer 210_1, a first insulating layer 220_1, a second layer 230_1, a second insulating layer 240, and a third layer 250 may be formed by etching the third raw material layer 250a, the second raw material insulating layer 240a, the second raw material layer 230a, the first raw material insulating layer 220a, and the first raw material layer 210a. Since a portion of the light blocking structure 200_1 needs to remain without being removed, the third raw material layer 250a, the second raw material insulating layer 240a, the second raw material layer 230a, the first raw material insulating layer 220a, and the first raw material layer 210a may be etched by using an anisotropic etching process.

[0172] Reference Fig.17D , the second wedge-shaped layer 130 having a second refractive index greater than the first refractive index may be formed on the first wedge-shaped layer 110 having the light blocking structure 200_1 formed thereon. Thus, the optical sheet may be manufactured.

[0173] Fig.18 is a block diagram illustrating an electronic device 500 according to an exemplary embodiment.

[0174] Reference Fig.18, the electronic device 500 may include a processor 510, a memory device 520, a storage device 530, an input / output (I / O) device 540, a power supply 550, and a display device 560. Here, the display device 560 may be Figure 8 In addition, the electronic device 500 may also include a plurality of ports for communicating with a graphics card, a sound card, a memory card, a universal serial bus (USB) device, other electronic devices, etc. In an embodiment, as described above, the electronic device 500 may be implemented as a display device for a vehicle (e.g., a car). However, the electronic device 500 according to the present invention is not limited thereto. For example, the electronic device 500 may be implemented as a cellular phone, a video phone, a smart tablet, a smart watch, a tablet PC, a car navigation system, a computer monitor, a laptop computer, a head mounted display (HMD) device, etc.

[0175] The processor 510 may perform various computing functions. The processor 510 may be a microprocessor, a central processing unit (CPU), an application processor (AP), etc. The processor 510 may be coupled to other components via an address bus, a control bus, a data bus, etc. In addition, the processor 510 may be coupled to an expansion bus, such as a peripheral component interconnection (PCI) bus. The memory device 520 may store data for the operation of the electronic device 500. For example, the memory device 520 may include at least one non-volatile memory device, such as an erasable programmable read-only memory (EPROM) device, an electrically erasable programmable read-only memory (EEPROM) device, a flash memory device, a phase change random access memory (PRAM) device, a resistance random access memory (RRAM) device, a nano floating gate memory (NFGM) device, a polymer random access memory (PoRAM) device, a magnetic random access memory (MRAM) device, a ferroelectric random access memory (FRAM) device, etc.; and / or at least one volatile memory device, such as a dynamic random access memory (DRAM) device, a static random access memory (SRAM) device, a mobile DRAM device, etc. The storage device 530 may include a solid-state drive (SSD) device, a hard disk drive (HDD) device, a CD-ROM device, etc. The I / O device 540 may include an input device such as a keyboard, a keypad, a mouse device, a touch pad, a touch screen, etc., and an output device such as a printer, a speaker, etc. The power supply 550 may provide power for the operation of the electronic device 500.

[0176] The display device 560 may be coupled to other components via a bus or other communication link. In some exemplary embodiments, the I / O device 540 may include the display device 560. As described above, since the display device 560 includes an optical sheet including a first wedge-shaped layer, a light blocking pattern, and a second wedge-shaped layer, a display device configured to limit light emitted at a cutoff angle or greater can be obtained. In addition, since the optical sheet has a light blocking pattern formed on a vertical surface, the aperture ratio as a whole is high. Accordingly, high brightness can be obtained while limiting light emitted at a cutoff angle or greater. Since these contents are described above, the repetitive descriptions related thereto will not be repeated.

[0177] When the display device is used as a display device for a vehicle, the direction for limiting the light emitting angle of the display panel may be an upward direction relative to a direction perpendicular to the display panel (i.e., a direction perpendicular to the main plane of the display panel). Accordingly, reflection of light emitted from the display device on the windshield of the vehicle can be reduced.

[0178] In addition, the direction for limiting the light emitting angle can be additionally limited to the left and right directions relative to the direction perpendicular to the display panel. Accordingly, the problem of light emitted from the display device reflecting on the glass at both sides of the vehicle and thus interfering with the driver's field of view can be reduced.

[0179] The present invention can be applied to a display device and an electronic device including the display device. For example, the present invention can be applied to a smart phone, a cellular phone, a video phone, a smart tablet, a smart watch, a tablet PC, a car navigation system, a television, a computer monitor, a laptop computer, a head-mounted display device, etc.

[0180] The foregoing describes exemplary embodiments and should not be construed as being limited thereto. Although several exemplary embodiments have been described, those skilled in the art will readily recognize that many modifications may be made in the exemplary embodiments without materially departing from the novel teachings and advantages of the inventive concept. Accordingly, all such modifications are intended to be included within the scope of the inventive concept as defined in the claims. Therefore, it will be understood that the foregoing describes various exemplary embodiments and should not be construed as being limited to the specific exemplary embodiments disclosed, and modifications to the disclosed exemplary embodiments as well as other exemplary embodiments are intended to be included within the scope of the appended claims.

Claims

1. An optical sheet, comprising: a first wedge-shaped layer having a first refractive index and comprising a wedge-shaped prism pattern, the prism pattern comprising a first inclined surface having a first inclination angle relative to a plane defined by a first direction and a second direction and a first vertical surface extending in a third direction perpendicular to the plane, wherein the second direction is perpendicular to the first direction and the first inclination angle is greater than 0 degrees and less than 90 degrees; a second wedge-shaped layer disposed on the first wedge-shaped layer and having a second refractive index greater than the first refractive index; as well as A first light blocking pattern is disposed between the first wedge-shaped layer and the second wedge-shaped layer and includes a first surface contacting the first vertical surface and a second surface inclined to have the first inclination angle with respect to the plane while contacting the first inclined surface.

2. The optical sheet according to claim 1, further comprising: The base film is disposed on the lower surface of the first wedge layer or the upper surface of the second wedge layer.

3. The optical sheet according to claim 2, wherein: The second surface of the first light-blocking pattern is a surface closest to the base film among the surfaces of the first light-blocking pattern.

4. The optical sheet according to claim 1, wherein: The first light blocking pattern comprises: a first layer parallel to the first vertical surface and comprising metal; a second layer, parallel to the first layer, spaced apart from the first layer, and comprising metal; and The first insulating layer is disposed between the first layer and the second layer.

5. The optical sheet according to claim 4, wherein: The first layer includes a first portion in contact with the first vertical surface and a second portion extending from the first vertical surface and in contact with the first inclined surface.

6. The optical sheet according to claim 4, wherein: The first layer has a first thickness, and the second layer has a second thickness that is thinner than the first layer.

7. The optical sheet according to claim 4, further comprising: a third layer, parallel to the second layer, spaced apart from the second layer, and comprising metal; and a second insulating layer, disposed between the second layer and the third layer, Wherein, the second layer is arranged between the first insulating layer and the second insulating layer.

8. The optical sheet according to claim 1, wherein: The first light-blocking pattern includes a third surface facing the second surface, and the third surface is parallel to the plane.

9. The optical sheet according to claim 1, wherein: The prism pattern of the first wedge layer extends in the first direction, the prism pattern is provided in plurality, and the plurality of prism patterns are arranged in the second direction.

10. The optical sheet according to claim 1, further comprising: a third wedge-shaped layer, disposed on the second wedge-shaped layer, having a third refractive index and comprising a wedge-shaped prism pattern, the prism pattern of the third wedge-shaped layer comprising a second inclined surface and a second vertical surface extending in the third direction, the second inclined surface having a second inclined angle inclined relative to the plane in a direction different from the first inclined angle; a fourth wedge-shaped layer, disposed on the third wedge-shaped layer and having a fourth refractive index greater than the third refractive index; as well as A second light blocking pattern is disposed between the third wedge-shaped layer and the fourth wedge-shaped layer and includes a first surface contacting the second vertical surface and a second surface inclined to have the second inclination angle with respect to the plane while contacting the second inclined surface.

11. The optical sheet according to claim 10, wherein: The prism pattern of the first wedge layer is provided in plurality, the plurality of the prism patterns of the first wedge layer are arranged in one direction, and a distance between two adjacent first vertical surfaces is defined as a first pitch of the plurality of the prism patterns of the first wedge layer; wherein the prism pattern of the third wedge layer is provided in plurality, the plurality of prism patterns of the third wedge layer are arranged in one direction, and the distance between two adjacent second vertical surfaces is defined as the second pitch of the plurality of prism patterns of the third wedge layer, and The first pitch of the plurality of prism patterns in the first wedge-shaped layer and the second pitch of the plurality of prism patterns in the third wedge-shaped layer are different from each other.

12. The optical sheet according to claim 1, further comprising: The anti-reflection layer is disposed on the first inclined surface.

13. The optical sheet according to claim 1, wherein: A square wave pattern is defined by the first inclined surface.

14. A method for manufacturing an optical sheet, the method comprising: forming a first wedge-shaped layer on a base film, wherein the first wedge-shaped layer has a first refractive index and includes a wedge-shaped prism pattern, the prism pattern including an inclined surface having an inclined angle relative to a main surface plane defining the base film and a vertical surface extending in a direction perpendicular to the main surface plane of the base film; forming a light blocking pattern on the vertical surface of the first wedge layer; and forming a second wedge-shaped layer having a second refractive index on the first wedge-shaped layer formed with the light blocking pattern, wherein the light blocking pattern formed includes a surface inclined to have the inclined angle relative to the main surface plane defining the base film while contacting the inclined surface of the prism pattern, The inclination angle is greater than 0 degree and less than 90 degrees.

15. The method according to claim 14, wherein: Forming the first wedge-shaped layer on the base film includes: forming a resin layer on the base film; forming the prism pattern on the resin layer by using a mold; and The resin layer is cured.

16. The method according to claim 14, wherein: Forming the light blocking pattern on the vertical surface of the first wedge layer includes: forming a first raw material layer including metal on the first wedge layer; forming a first raw material insulating layer on the first raw material layer; forming a second material layer including metal on the first material insulating layer; and The light blocking pattern including the first layer, the first insulating layer, and the second layer is formed by etching the second raw material layer, the first raw material insulating layer, and the first raw material layer using an anisotropic etching process.

17. The method according to claim 16, wherein: The thickness of the first layer is different from the thickness of the second layer.

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