Display device

Abstract

A display device is provided. The display device includes a display panel including LEDs that emit light, a first layer including a porous polymer and disposed on the display panel, a second layer including a metal halide and disposed on the first layer, and a lenticular lens disposed on the display panel, wherein the first layer has a first refractive index, and the second layer has a second refractive index that is smaller than the first refractive index.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to and all benefits derived therefrom of Korean Patent Application No. 10-2020-0054087, filed on May 6, 2020, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to a three-dimensional image display device, and more particularly to a three-dimensional image display device having improved transmittance of light emitted from a light-emitting element in the display device, and an optical film having improved transmittance. Background Technology

[0004] Various display devices used in multimedia devices (such as televisions, mobile phones, tablets, navigation devices, and game consoles) allow light emitted from light-emitting elements to pass through a window, thus providing an image to the user.

[0005] User demand for display devices capable of displaying 3D images is increasing, leading to the creation of stereoscopic displays that show more realistic images, and the commercialization of 3D image display devices is underway.

[0006] In particular, research is underway on three-dimensional image display devices with refractive layers that can improve transmittance in order to minimize external light reflection while preserving image sharpness. Summary of the Invention

[0007] This disclosure provides a display device with improved image visibility and emission efficiency.

[0008] This disclosure also provides optical films with increased light transmittance.

[0009] This disclosure also provides a method for manufacturing an optical film, which provides an optical film with increased light transmittance.

[0010] An embodiment of the present invention provides a display device comprising a display panel, a first layer, a second layer, and a lenticular lens. The display panel includes a light-emitting element configured to emit light. The first layer comprises a porous polymer and is disposed on the display panel. The second layer comprises a metal halide and is disposed on the first layer. The lenticular lens is disposed on the display panel. The first layer has a first refractive index, and the second layer has a second refractive index smaller than the first refractive index.

[0011] In an embodiment, the porous polymer may include a plurality of pores, and each of the plurality of pores may have a diameter of about 500 nanometers to about 1,000 nanometers (nm).

[0012] In an implementation, the second layer may have a thickness of about 100 nm to about 200 nm.

[0013] In an embodiment, the first layer may include any one of polycarbonate, polymethyl methacrylate, and polysiloxane.

[0014] In an embodiment, the second layer may include at least one of MgF2 and SiO2.

[0015] In this implementation, the second layer may contact the first layer.

[0016] In one embodiment, the first layer may have a transmittance of at least 92 percent (%) in the wavelength range of about 400 nm to about 700 nm.

[0017] In one implementation, the cylindrical lens may be disposed on the second layer.

[0018] In one embodiment, the cylindrical lens may be disposed between the display panel and the first layer.

[0019] In an embodiment of the present invention, the optical film includes a first layer and a second layer, the first layer comprising a porous polymer, and the second layer comprising a metal halide disposed on the first layer, wherein the first layer has a first refractive index, and the second layer has a second refractive index smaller than the first refractive index.

[0020] In an embodiment, the porous polymer may have multiple pores, and each of the multiple pores may have a diameter of about 500 nm to about 1000 nm.

[0021] In an implementation, the second layer may have a thickness of about 100 nm to about 200 nm.

[0022] In an embodiment, the first layer may comprise any one of polycarbonate, polymethyl methacrylate, and polysiloxane.

[0023] In an embodiment, the second layer may include at least one of MgF2 and SiO2.

[0024] In this implementation, the second layer may contact the first layer.

[0025] In an embodiment of the present invention, a method for manufacturing an optical film includes: preparing a base substrate; generating a first solution by mixing a polymer, a non-solvent, and a solvent; coating the base substrate with the first solution; removing the non-solvent from the first solution to form a first layer comprising a porous polymer; and forming a second layer comprising a metal halide on the first layer.

[0026] In this embodiment, the concentration of the non-solvent in the first solution may be from about 1 volume percentage (vol%) to about 4 vol%.

[0027] In embodiments, the polymer may include any one of polycarbonate, polymethyl methacrylate, and polysiloxane.

[0028] In this embodiment, the metal halide may be MgF2.

[0029] In the embodiments, the non-solvent may include methanol, cyclohexane, or nonane. Attached Figure Description

[0030] The accompanying drawings are included to provide a further understanding of the concept of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the concept of the invention and, together with the description, serve to explain the principles of the concept. In the drawings:

[0031] Figure 1 An exemplary perspective view of a display device according to an embodiment of the concept of the present invention is shown;

[0032] Figure 2 An exploded perspective view of a display device according to an embodiment of the concept of the present invention is shown as an example;

[0033] Figure 3 An example is shown along Figure 2 The cross-sectional view taken by I-I';

[0034] Figure 4 and Figure 5 It is a graph showing the transmittance of the optical film according to the embodiment;

[0035] Figure 6 This is a flowchart illustrating a method for manufacturing an optical film according to an embodiment of the concept of the present invention;

[0036] Figure 7 The operation of a method for manufacturing an optical film according to an embodiment of the concept of the present invention is illustrated by way of example;

[0037] Figure 8 The operation of a method for manufacturing an optical film according to an embodiment of the concept of the present invention is illustrated by way of example;

[0038] Figures 9A to 9D It is an image showing a cross-sectional view of the first layer according to an embodiment of the concept of the present invention; and

[0039] Figure 10 The operation of a method for manufacturing an optical film according to an embodiment of the concept of the present invention is illustrated by way of example. Detailed Implementation

[0040] In this disclosure, it will be understood that when an element (or region, layer, portion) is referred to as being “on”, “connected to” or “attached to” another element, it can be directly on, directly connected to or directly attached to the other element, or a third element may be disposed between them.

[0041] Throughout this specification, similar reference numerals refer to similar elements. Furthermore, the scale and dimensions of elements are exaggerated in the drawings for the purpose of effective description of the technical content. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. Unless otherwise clearly indicated, the singular forms “a,” “an,” and “the” as used herein are intended to also include the plural forms, including “at least one.” “At least one” will not be construed as limiting “a” or “an.” “Or” means “and / or.” The term “and / or” includes any and all combinations of one or more of the associated listed items.

[0042] It will be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the teachings of the invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well.

[0043] Terms such as "below," "lower," "above," and "upper" are used to describe the relationship between one element or feature and another element or feature as shown in the figures. These terms are relative concepts that can be interpreted in relation to the orientation depicted in the figures.

[0044] It should also be understood that when the terms “comprise,” “comprising,” or “have” are used in this specification, they are intended to indicate the presence of the stated features, integers, steps, operations, elements, components, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0045] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless expressly defined herein, terms (such as those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formal sense.

[0046] In the following description, embodiments of the concept of the present invention will be described with reference to the accompanying drawings.

[0047] Figure 1 An exemplary perspective view of a display device DD according to an embodiment of the concept of the present invention is shown. Figure 2 An exploded perspective view of a display device DD according to an embodiment of the concept of the present invention is shown as an example. Figure 3 An example is shown along Figure 2 The cross-sectional view taken from I-I'. Figure 4 and Figure 5 This is a graph showing the transmittance of the optical film according to the embodiment.

[0048] Figure 1 An exemplary display device DD used in a smartphone is shown. The display device DD can be used in small to medium-sized electronic devices such as mobile phones, tablets, car navigation systems, game consoles, or smartwatches, as well as large electronic devices such as televisions or monitors, but is not limited thereto.

[0049] In this disclosure, a smartphone can be a display device DD that realizes a three-dimensional image. In other words, the display device DD according to an embodiment of the concept of the present invention can provide a three-dimensional image to a user. As a method for realizing a three-dimensional image, there are methods using glasses and methods without glasses. Hereinafter, a display device that realizes a three-dimensional image in a glasses-free manner will be described. By using lenticular lenses or parallax gratings to realize images corresponding to multiple viewpoints, the glasses-free three-dimensional image display device provides a three-dimensional image to a user. The display device DD may define a display area DA and a non-display area NDA. The display area DA is the area where the three-dimensional image is realized. That is, the display area DA is the area where the image IM is displayed.

[0050] The first direction DR1 is the direction in which the short side of the display device DD extends, and the second direction DR2 is the direction in which the long side of the display device DD extends. For example... Figure 1As shown, the display area DA may be parallel to the plane defined by the first direction DR1 and the second direction DR2. The normal direction of the display area DA (i.e., the thickness direction of the display device DD) indicates the third direction DR3. The front (or upper) and back (or lower) sides of each component are distinguished according to the third direction DR3. However, the directions indicated from the first direction to the third direction are relative concepts and can therefore be changed to other directions. In the following, the first direction to the third direction refers to the directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3, respectively, and is designated by similar reference numerals or symbols.

[0051] Figure 1 The shape of the display area DA shown is an example, and the shape of the display area DA can be changed in another embodiment. The non-display area NDA is adjacent to the display area DA and is an area where the image IM is not displayed. The border area of ​​the display device DD may be defined by the non-display area NDA. The non-display area NDA may surround the display area DA. However, embodiments of the present invention are not limited to this, and the shapes of the display area DA and the non-display area NDA can be changed in another embodiment.

[0052] Reference Figure 2 The display device DD may include a window WD, an optical film RC, a cylindrical lens LS, a display panel DP, a printed circuit board PCB, a control drive circuit CIC, and a housing HS.

[0053] In this embodiment, a window WD may be disposed on the display panel DP. The window WD protects the internal components of the display device DD from external impacts. The window WD may define a transmission area TA and a bezel area BZA. The transmission area TA may be the area through which incident light is transmitted. Specifically, light generated from the display panel DP can pass through the transmission area TA, and the image formed by the transmitted light is visible to the user. In this embodiment, in a planar view (i.e., a view on a third-direction DR3), the transmission area TA may overlap with the display area DA.

[0054] The border region BZA may be adjacent to the transmissive region TA. Specifically, the border region BZA may surround the transmissive region TA. In embodiments of the present invention, the border region BZA may have a predetermined color. In a plan view, the border region BZA may overlap with the non-display region NDA.

[0055] The display panel DP can generate an image and provide the generated image to the DR3 by a third party. In the display device DD of the embodiment, the display panel DP can be a light-emitting display panel. For example, the display panel DP can be a micro-light-emitting diode (micro-LED) display panel, an organic electroluminescent display panel, or a quantum dot light-emitting display panel. In this disclosure, a description based on an organic electroluminescent display panel is given. However, embodiments of the inventive concept are not limited thereto.

[0056] The display panel DP can be a rigid display panel. Alternatively, in an embodiment, the display panel DP can be a flexible display panel. The display panel DP may include a flexible substrate. The term "flexible" herein means bendability and is not limited to a structure that can be fully folded, but may include a structure that can be bent to a degree of a few nanometers.

[0057] The display panel (DP) can be defined as having an active area (AA) and a non-active area (NAA). The active area (AA) is... Figure 1 The display area DA corresponds to the area that can display the image IM and detect user input.

[0058] The passive area NAA corresponds to the non-display area NDA and can provide electrical signals to the active area AA. The passive area NAA may contain wires for receiving electrical signals from the active area AA.

[0059] In addition, the display panel DP may include a base substrate (not shown), a circuit layer (not shown), a light-emitting element layer (not shown), and an encapsulation layer (not shown). The base substrate provides a base surface on which other parts of the display panel DP are disposed. The circuit layer includes pixel driving circuitry and signal lines. For example, the circuit layer may include multiple transistors, capacitors, and lines. The light-emitting element layer is disposed on the circuit layer and may include light-emitting elements connected to multiple transistors. In the light-emitting element layer, pixels are arranged in a matrix. The display panel DP can generate an image by light emitted from the light-emitting elements in the light-emitting element layer. The encapsulation layer is disposed on the light-emitting element layer and may encapsulate the light-emitting element layer and protect it from impurities.

[0060] Although not shown, the display device of the embodiment may also include an input sensor disposed on the display panel DP. Specifically, the input sensor may be disposed on the encapsulation layer of the display panel DP. The input sensor may include a plurality of sensing electrodes capable of sensing user input and generating a plurality of sensing signals.

[0061] A control driver circuit (CIC) and an input sensing driver circuit (TIC) can be mounted on a printed circuit board (PCB). The PCB can be electrically connected to the pads (PD) of the display panel (DP). The input sensing driver circuit (TIC) senses changes in the electrostatic capacitance of the input sensor using the pads (PD). The control driver circuit (CIC) controls the data driver circuit (DIC). The data driver circuit (DIC) provides data signals to the pixels based on signals received from the control driver circuit (CIC).

[0062] A housing HS can be installed below the display panel DP. The housing HS can accommodate the window WD, optical film RC, cylindrical lens LS and display panel DP.

[0063] The cylindrical lens LS and the optical film RC can be positioned between the display panel DP and the window WD.

[0064] like Figure 2 As shown, the optical film RC can be disposed between the cylindrical lens LS and the window WD.

[0065] The optical film RC can be a refractive index adjustment layer. The optical film RC may include a first layer HR and a second layer LR disposed on the first layer HR. In an embodiment, the second layer LR may be in contact with the first layer HR. Figure 2 As shown, when the optical film RC is disposed on the cylindrical lens LS, the first layer HR can be coated on the cylindrical lens LS. However, embodiments of the present invention are not limited thereto. In another embodiment, an optically clear adhesive (OCA) can be disposed between the second layer LR of the optical film RC and the cylindrical lens LS.

[0066] Reference Figure 3 The first layer of refractive index (HR) comprises a porous polymer. The porous polymer may include porous polycarbonate, porous polymethyl methacrylate (PMMA), and / or porous polysiloxane. For example, the first layer of HR may comprise porous polymethyl methacrylate. The refractive index of the first layer of HR may vary between about 1.4 and about 1.49 depending on the composition of the first layer of HR.

[0067] In one embodiment, the porous polymer of the first layer of HR may define a plurality of porous PPs. The plurality of porous PPs may be shaped such that the surface of the porous polymer of the first layer of HR is concave. The diameter DM of each of the plurality of porous PPs may be approximately 500 nanometers to approximately 1000 nanometers (nm). Although Figure 3An illustrative example shows multiple orifice PPs, each with a specific shape, but embodiments of the present invention are not limited thereto. Therefore, the multiple orifice PPs can have different sizes and shapes. In an embodiment, when the multiple orifice PPs are each elliptical, the diameter DM of each of the multiple orifice PPs can indicate the average diameter of the orifice PPs.

[0068] In the optical film RC according to an embodiment, the transmittance of visible light can be adjusted according to the diameter DM of the apertures PP in the first layer HR. Specifically, the transmittance of visible light passing through the first layer HR can be adjusted according to the diameter DM of the plurality of apertures PP. If the diameter DM of the plurality of apertures PP increases, the transmittance of light relative to the first layer HR can increase in a long wavelength range of about 600 nm to about 700 nm. Conversely, if the diameter DM of the plurality of apertures PP decreases, the transmittance of light relative to the first layer HR can increase in a short wavelength range of about 300 nm to about 400 nm. In other words, in the optical film RC according to an embodiment, the transmittance of light with a specific wavelength relative to the first layer HR can be increased or decreased by adjusting the diameter DM of the plurality of apertures PP. In another embodiment, for example, the transmittance of visible light relative to the first layer HR can be at least about 90 percent (%). More specifically, the transmittance of light with a wavelength of about 400 nm to about 700 nm is at least about 92%.

[0069] The first layer HR has a first refractive index, and the second layer LR has a second refractive index. The first refractive index is greater than the second refractive index. That is, the first layer HR is a higher refractive index layer compared to the second layer LR, and the second layer LR is a lower refractive index layer compared to the first layer HR. In the optical film RC, the low refractive index layer is disposed on and in contact with the high refractive index layer, so as to increase or decrease the transmittance of light passing through the optical film RC.

[0070] In the optical film RC of the embodiment, the transmittance of light with a specific wavelength can be adjusted according to the difference between a first refractive index and a second refractive index. Specifically, the second refractive index can be adjusted by changing the thickness LL of the second layer LR. For example, the thickness LL of the second layer LR can be about 100 nm to about 200 nm. The second refractive index can be about 1.35 to about 1.45. In this disclosure, the thickness LL of the second layer LR can be the length obtained by measuring the second layer LR on a third-direction DR3.

[0071] In the optical film RC according to the embodiment, the difference between the first refractive index and the second refractive index can be adjusted by changing the second refractive index. For example, if the thickness LL of the second layer LR increases, the second refractive index can decrease, and the difference between the first and second refractive indices can increase. The embodiments of the present invention are not limited thereto. Depending on the thickness LL of the second layer LR, the difference between the first and second refractive indices can have various values, making it possible to adjust the light transmittance of the optical film RC over a wide range.

[0072] The second layer LR comprises a metal halide. The metal halide may be MgF2. However, embodiments of the present invention are not limited thereto. Any material can be used as the metal halide included in the second layer LR, without any limitation, as long as the material has a lower refractive index than the first layer HR and the refractive index can be adjusted according to wavelength by adjusting the thickness of the second layer LR or by adjusting the diameter DM of the multiple pores PP. For example, the second layer LR may comprise SiO2.

[0073] Figure 4 and Figure 5 This is a graph showing the transmittance of the optical film RC according to an embodiment. More specifically, Figure 4 and Figure 5 This is a graph showing the transmittance (%) of an optical film RC relative to wavelength (nm) according to several embodiments. Figure 4 The transmittance of visible light, as measured in the first, second, and third cases, is shown. In the first case (hereinafter referred to as Experimental Example 1), a glass substrate was placed; in the second case (hereinafter referred to as Experimental Example 2), polymethyl methacrylate (hereinafter referred to as PMMA) was placed as a monolayer on the glass substrate; and in the third case (hereinafter referred to as Experimental Example 3), PMMA and MgF2 were sequentially laminated on the glass substrate. The refractive index of the glass substrate was about 1.52, the refractive index of PMMA was about 1.49, and the refractive index of MgF2 was about 1.38. The PMMA layer was obtained by spin-coating the glass substrate with a solution of PMMA at a concentration of about 10 mg / mL in chloroform for about 40 seconds at about 7000 rpm, and MgF2 was deposited on the PMMA to a thickness of 100 nm.

[0074] Reference Figure 4 The curves in the diagram confirm that the transmittance of Experimental Examples 2 and 3 is greater than that of Experimental Example 1 across the entire visible light range (approximately 300 nm to 700 nm). In other words, it can be seen that the display device including the PMMA layer has a more improved emission efficiency of the light-emitting element compared to the display device without the PMMA layer.

[0075] from Figure 4 It can be observed that, in a long wavelength range of at least about 500 nm, the transmittance is further improved in the order of Experimental Example 1, Experimental Example 2, and Experimental Example 3. Specifically, for example, light with a wavelength of about 600 nm showed a transmittance of about 89% in Experimental Example 1, about 90% in Experimental Example 2, and about 91% in Experimental Example 3. That is, when MgF2 is deposited on PMMA with a thickness of about 100 nm, it can be demonstrated that the transmittance is improved even in the long wavelength range.

[0076] The comparison between Experimental Example 2 and Experimental Example 3 shows that the case of depositing MgF2, which has a lower refractive index than PMMA, on PMMA (i.e., Experimental Example 3) has a more improved transmittance compared to the case of depositing PMMA only on a glass substrate (i.e., Experimental Example 2).

[0077] Figure 5 The transmittance of visible light is shown as measured with a glass substrate on which porous polymethyl methacrylate (hereinafter referred to as porous PMMA) is placed.

[0078] Porous PMMA was prepared using nonane as a non-solvent and chloroform at a concentration of 10 mg / ml, with the nonane concentration adjusted to approximately 1 vol%, approximately 2 vol%, and approximately 3 vol%. The diameter DM of the multiple pores PP in the porous PMMA increased with increasing nonane concentration.

[0079] Reference Figure 5 The curves shown indicate that the transmittance is significantly improved in porous PMMA compared to PMMA with a smooth surface. This improvement is particularly noticeable in the long wavelength range of approximately 500 nm to approximately 700 nm. Figure 4 The transmittance of a non-porous PMMA monolayer is approximately 90% or lower, while... Figure 5 The transmittance of the optical film, which includes porous PMMA, is increased to at least about 92%.

[0080] Moreover, refer to Figure 5 The graph shows that the transmittance of light increases with increasing nonane concentration. Specifically, for example, light with a wavelength of about 600 nm shows a transmittance of about 93% at a nonane concentration of about 2 vol%.

[0081] When Figure 4 The curve of Experiment Example 2 and Figure 5When comparing the curves with a nonane concentration of approximately 2 vol%, it can be seen that the transmittance in the long wavelength range is higher when the porous PMMA is formed as a monolayer (i.e., the 2 vol%) compared to the case where the nonporous PMMA is formed as a monolayer on the glass substrate (Experimental Example 1).

[0082] Specifically, light with a wavelength of approximately 600 nm exhibits approximately 90% transmittance when the glass substrate is coated with a non-porous PMMA layer, and approximately 93% transmittance when the glass substrate is coated with a porous PMMA layer. Therefore, it can be seen that, compared to display devices comprising a PMMA layer with a surface without irregularities, display devices comprising a porous PMMA layer achieve significantly improved emission efficiency and visibility. Furthermore, referring to… Figure 4 The results of Experiments 2 and 3 in the experiment predict that if... Figure 5 By further arranging MgF2 to replace the single layer of porous PMMA, light with a wavelength range of about 600 nm showed a transmittance of at least about 93%.

[0083] Figure 6 This is a flowchart illustrating a method for manufacturing an optical film RC according to an embodiment of the concept of the present invention. Figure 7 , Figure 8 and Figure 10 This is a schematic diagram showing the operation of a method for manufacturing an optical film RC according to an embodiment of the concept of the present invention. Figure 9A and Figure 9D This is an image of the first layer HR according to an embodiment of the concept of the present invention.

[0084] according to Figure 6 According to an embodiment of the present invention, the method S10 for manufacturing an optical film RC includes an operation S100 for preparing a base substrate GL, an operation S200 for preparing a first solution PO, an operation S300 for coating with the first solution PO, an operation S400 for forming a first layer HR, and an operation S500 for forming a second layer LR.

[0085] Specifically, in operation S100 for preparing the base substrate GL, the base substrate GL may be a glass substrate. However, embodiments of the present invention are not limited thereto.

[0086] Reference Figure 7The operation S200 for preparing the first solution PO can be an operation of adding a non-solvent NS to a preparation solution PS obtained by dissolving a polymer in a solvent to prepare the first solution PO. The solvent for the preparation solution PS can be chloroform. The polymer can be polymethyl methacrylate (hereinafter referred to as PMMA). PMMA can be dissolved in the solvent at a concentration of about 10 mg / ml. The non-solvent NS can be an aliphatic hydrocarbon. Specifically, the non-solvent NS can be methanol, cyclohexanol, and / or nonane. For example, the non-solvent NS can be nonane. Nonane can be mixed in the preparation solution PS without dissolving in the preparation solution PS. However, embodiments of the present invention are not limited thereto.

[0087] Reference Figure 8 The coating operation S300 with the first solution PO can be an operation of coating the base substrate GL with the first solution PO and then drying it. Specifically, the operation of coating the base substrate GL with the first solution PO can be performed by processes such as spin coating, slot coating, bar coating, or inkjet printing. For example, the first solution PO can be applied by a spin coating process.

[0088] Operation S400 for forming the first layer HR can be an operation of drying the first solution PO that has been coated on the base substrate GL. When the first solution PO is dried, the non-solvent NS mixed in the first solution PO can be removed, and multiple pores PP can be formed at the sites where the non-solvent NS is present. In other words, the first layer HR can be a layer with an uneven surface formed on the polymer surface.

[0089] The diameter DM of a multi-pore PP can be adjusted by regulating the concentration of nonane in the first solution PO. For example, as the concentration of nonane increases, the diameter DM of the multi-pore PP can be increased. Figures 9A to 9D These are scanning electron microscope images of the pores PP confined in the first layer HR when the concentration of nonane in the first solution PO is about 0 vol%, about 1 vol%, about 2 vol%, and about 3 vol%.

[0090] Reference Figure 9A When nonane is approximately 0 vol%, no pores may be formed in the first HR layer, and a polymer layer without unevenness may be formed. (See reference...) Figure 9B and Figure 9C It can be seen that as the concentration of nonane increases, the diameter DM of the multiple pore PP increases respectively. As mentioned above, as the diameter DM increases, the transmittance in the long wavelength range of about 600 to about 700 nm becomes higher, and as the diameter DM decreases, the transmittance in the short wavelength range becomes higher.

[0091] Operation S500 for forming the second layer LR is an operation of depositing a metal halide on the first layer HR. In an embodiment, the metal halide may be MgF2. The second layer LR may have a thickness LL of about 100 to about 200 nm. As previously mentioned, the second refractive index can be adjusted by adjusting the thickness of the second layer LR.

[0092] A method for manufacturing an optical film RC according to an embodiment of the present invention includes operations S100 for preparing a base substrate GL, operations S200 for preparing a first solution PO, operations S300 for coating with the first solution PO, operations S400 for forming a first layer HR, and operations S500 for forming a second layer LR, thereby providing an optical film with improved light transmittance. Display devices using the optical film of the embodiment can improve emission efficiency and visibility, and reduce the reflection of external light to the user.

[0093] The display device according to an exemplary embodiment of the concept of the present invention can improve visibility and emission efficiency.

[0094] An optical film according to an exemplary embodiment of the concept of the present invention can increase light transmittance.

[0095] The method of manufacturing an optical film according to an exemplary embodiment of the concept of the present invention can provide an optical film with increased light transmittance.

[0096] While exemplary embodiments of the invention have been described, it is to be understood that the invention is not limited to these exemplary embodiments, but rather that various changes and modifications can be made by those skilled in the art within the spirit and scope of the invention as claimed in the claims.

Claims

1. A display device, comprising: The display panel includes a light-emitting element configured to emit light; An optical film includes a first layer and a second layer disposed on the first layer, wherein the first layer is a polymer layer having multiple pores and disposed on the display panel, and the second layer includes a metal halide; as well as A lenticular lens, wherein the lenticular lens is disposed on the display panel. The first layer has a first refractive index, and the second layer has a second refractive index that is smaller than the first refractive index. Each of the plurality of pores has a diameter of 500 nm to 1000 nm, the plurality of pores are formed on the surface of the first layer such that the surface of the polymer in the first layer is concave, and the second layer covers the plurality of pores. The transmittance of light passing through the first layer is adjusted according to the diameter of each of the plurality of holes. Specifically, when the diameter of each of the plurality of holes increases, the transmittance of light passing through the first layer in the wavelength range of 600 nm to 700 nm increases, and when the diameter of each of the plurality of holes decreases, the transmittance of light passing through the first layer in the wavelength range of 300 nm to 400 nm increases.

2. The display device of claim 1, wherein, The second layer has a thickness of 100nm to 200nm.

3. The display device of claim 1, wherein, The first layer comprises any one of polycarbonate, polymethyl methacrylate, and polysiloxane.

4. The display device as claimed in claim 1, wherein, The second layer includes at least one of MgF2 and SiO2.

5. The display device as claimed in claim 1, wherein, The second layer is in contact with the first layer.

6. The display device as claimed in claim 1, wherein, The first layer has a transmittance of at least 92% in the wavelength range of 400 nm to 700 nm.

7. The display device as claimed in claim 1, wherein, The cylindrical lens is disposed on the second layer.

8. The display device as claimed in claim 1, wherein, The cylindrical lens is disposed between the display panel and the first layer.

Images