Backlight unit

Abstract

The present application relates to a backlight unit, the backlight unit comprising a light guide layer having an incident surface on which light is incident and an exit surface from which light is emitted; a light source disposed on the incident surface of the light guide layer and configured to generate the light; a low refractive layer disposed on the exit surface of the light guide layer; a color control layer disposed on the low refractive layer; and a protective layer disposed on the color control layer. The protective layer comprises a resin composition, the resin composition comprising a first repeating unit represented by Formula 1: [Formula 1] #imgabs0#

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2019-0009215, filed on January 24, 2019, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present disclosure herein relates to a backlight unit and a liquid crystal display device including the same, and more particularly, to a backlight unit having improved reliability by effectively protecting a color control layer, and a liquid crystal display device including the same. Background Art

[0004] Many electronic devices include a display device for providing images to a user. Due to the relatively low power consumption of liquid crystal display devices, liquid crystal display devices are often used in electronic devices with large displays, as well as in portable electronic devices with relatively small displays. Liquid crystal display devices often include various optical components added to a backlight unit in order to increase the light efficiency and color reproducibility of the display device.

[0005] However, the display quality of the display device may be degraded by scratches or the like generated during various processes, which may allow external moisture and oxygen to penetrate into the backlight unit. Summary of the invention

[0006] The present disclosure provides a backlight unit having improved reliability by preventing damage due to an external environment, and a liquid crystal display device including the backlight unit.

[0007] An exemplary embodiment of the present inventive concept provides a backlight unit, which includes a light guiding layer, the light guiding layer having an incident surface on which light is incident and an exit surface from which light is emitted; a light source, which is disposed on the incident surface of the light guiding layer and is configured to generate the light; a low refractive layer, which is disposed on the exit surface of the light guiding layer; a color control layer, which is disposed on the low refractive layer; and a protective layer, which is disposed on the color control layer, wherein the protective layer includes a resin composition, and the resin composition includes a first repeating unit represented by the following Formula 1.

[0008] [Formula 1]

[0009]

[0010] In formula 1, R 1 and R 2The substituted or unsubstituted alkyl groups are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cycloalkane group having 3 to 12 ring carbon atoms, The invention relates to a substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, and -* represents a position to be attached.

[0011] In an exemplary embodiment, the resin composition may further include a second repeating unit represented by Formula 2 below.

[0012] [Formula 2]

[0013]

[0014] In formula 2, R 3 To R 6 The substituted or unsubstituted alkyl groups are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cycloalkane group having 3 to 12 ring carbon atoms, The invention relates to a substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 12 ring carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 12 ring carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 12 ring carbon atoms, and -* represents a position to be attached.

[0015] In an exemplary embodiment, a molar ratio of the first repeating unit to the second repeating unit may be 1:1000 to 1000:1.

[0016] In an exemplary embodiment, the resin composition may further include a third repeating unit represented by Formula 3 below.

[0017] [Formula 3]

[0018]

[0019] In formula 3, X is OR 12 or O(SiO 3 / 2 R 13 ) 4+2n , and R 7 To R 13 Each of the following is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 12 ring carbon atoms, a substituted or an unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 12 ring carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 12 ring carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 12 ring carbon atoms, and n is an integer of 0 or greater, and -* represents a position to be attached.

[0020] In an exemplary embodiment, a molar ratio of the first repeating unit to the third repeating unit may be 1:1000 to 1000:1.

[0021] In an exemplary embodiment, the protective layer may further include silica particles.

[0022] In an exemplary embodiment, the protection layer may be disposed in an outermost region of the backlight unit.

[0023] In an exemplary embodiment, the color control layer may include quantum dots.

[0024] In an exemplary embodiment, the color control layer may further include a base resin and scattering particles dispersed in the base resin.

[0025] In an exemplary embodiment, the low-refractive layer may have a refractive index of 1.2 to 1.4, and include hollow silica.

[0026] In an exemplary embodiment, the low refractive layer may be disposed directly on the light guiding layer.

[0027] In an exemplary embodiment, the backlight unit may further include at least one blocking layer disposed adjacent to at least one surface of the color control layer.

[0028] In exemplary embodiments, the at least one barrier layer may include at least one inorganic film.

[0029] In an exemplary embodiment, the backlight unit may further include barrier layers disposed between the color control layer and the low refractive layer and between the color control layer and the protective layer, respectively.

[0030] In exemplary embodiments, the light guiding layer may include a light guiding pattern.

[0031] In an exemplary embodiment of the present inventive concept, a liquid crystal display device includes a liquid crystal display panel configured to display an image and a backlight unit configured to provide light to the liquid crystal display panel. The backlight unit includes a light source configured to generate the light; a light guide layer configured to guide the light generated by the light source; a low refractive layer disposed on the light guide layer; a color control layer disposed on the low refractive layer; and a protective layer disposed on the color control layer and including a resin composition, the resin composition including a first repeating unit represented by the following Formula 1.

[0032] [Formula 1]

[0033]

[0034] In formula 1, R 1 and R 2The substituted or unsubstituted alkyl groups are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cycloalkane group having 3 to 12 ring carbon atoms, The invention relates to a substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, and -* represents a position to be attached.

[0035] In an exemplary embodiment of the present inventive concept, a liquid crystal display device includes a liquid crystal display panel configured to display an image and a backlight unit configured to provide light to the liquid crystal display panel. The backlight unit includes a color control layer including quantum dots and a protective layer disposed on the color control layer and including a resin composition, wherein the resin composition includes two or more types of polysilsesquioxanes having different repeating units.

[0036] In an exemplary embodiment, the resin composition may be a thermosetting resin or a photocurable resin.

[0037] In exemplary embodiments, the protective layer may have a thickness of 1 μm to 10 μm.

[0038] In an exemplary embodiment, a composition for a protective layer of a backlight unit of a display device includes a resin composition including a first repeating unit represented by Formula 1 below.

[0039] [Formula 1]

[0040]

[0041] In formula 1, R 1 and R 2The substituted or unsubstituted alkyl groups are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cycloalkane group having 3 to 12 ring carbon atoms, The invention relates to a substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, and -* represents a position to be attached. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are included to provide a further understanding of the inventive concept and are incorporated in and constitute a part of this specification. The accompanying drawings illustrate exemplary embodiments of the inventive concept and together with the description serve to explain the principles of the inventive concept. In the drawings:

[0043] Figure 1 is an exploded perspective view of a liquid crystal display device according to an exemplary embodiment of the inventive concept;

[0044] Figure 2 is an exemplary embodiment according to the present invention. Figure 1 A cross-sectional view of the backlight unit taken along line II';

[0045] Figure 3A and Figure 3B is a cross-sectional view showing a portion of a color control layer according to an exemplary embodiment of the present inventive concept;

[0046] Figure 4A is a photograph of a cross section of a protective layer according to a comparative example after abrasion resistance evaluation was performed thereon;

[0047] Figure 4B is a photograph of a cross section of a protective layer according to an exemplary embodiment of the present inventive concept after abrasion resistance evaluation is performed thereon;

[0048] Figure 5A and Figure 5B is a diagram showing an exemplary embodiment according to the present inventive concept. Figure 1 A cross-sectional view of the backlight unit taken along line II';

[0049] Figure 6 is an exemplary embodiment according to the present invention. Figure 1 A cross-sectional view of the liquid crystal display taken along line II-II'; and

[0050] Figure 7 is a cross-sectional view of a liquid crystal display panel according to an exemplary embodiment of the inventive concept. DETAILED DESCRIPTION

[0051] The present invention can be modified in many alternative forms, and therefore exemplary embodiments will be illustrated in the drawings, and exemplary embodiments will be described in detail. However, it should be understood that the exemplary embodiments of the present invention are not intended to limit the present invention to the specific form disclosed, but are intended to cover all modifications, equivalents and substitutions that fall within the spirit and scope of the present invention.

[0052] When describing each accompanying drawing, the same reference numerals are used to represent the same elements. In addition, in the accompanying drawings, for the clarity of the present invention, the size of the amplified element is enlarged. It should be understood that although the terms "first", "second", etc. can be used to describe various elements in this article, these elements should not be limited to these terms. These terms can only be used to distinguish one element from another element. For example, without departing from the scope of the exemplary embodiments of the present invention, the first element can be referred to as the second element, and similarly, the second element can be referred to as the first element. The term in the singular form can include the plural form, unless the context clearly indicates otherwise.

[0053] In the present disclosure, it should be understood that the terms “including” or “having” are intended to specify the presence of stated features, integers, steps, operations, elements, components or combinations thereof in the disclosure, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components or combinations thereof.

[0054] In the present disclosure, when a part (e.g., a layer, a film, a region, or a plate) is referred to as being "on" or "over" another part, it includes not only embodiments in which the part is "directly" "on" another part, but also embodiments in which another part is disposed therebetween. In other words, when a part (e.g., a layer, a film, a region, or a plate) is referred to as being "under" or "below" another part, it includes not only embodiments in which the part is "directly" "under" another part, but also embodiments in which another part is disposed therebetween. Furthermore, in the present disclosure, being disposed "on" includes not only embodiments disposed above, but also embodiments disposed below.

[0055] Meanwhile, in the present specification, “directly disposed” means that there is no added layer, film, region, plate, etc. between a part of a layer, film, region, plate, etc. and another part. For example, “directly disposed” may mean that there is no additional member (e.g., bonding member) between two layers or two members.

[0056] Hereinafter, both a backlight unit and a liquid crystal display device according to exemplary embodiments of the inventive concept will be described with reference to the accompanying drawings.

[0057] Figure 1 is an exploded perspective view of a liquid crystal display device according to an exemplary embodiment of the inventive concept. Figure 2 is a cross-sectional view of a backlight unit included in a liquid crystal display device according to an exemplary embodiment of the inventive concept. Figure 3A and Figure 3B is a cross-sectional view illustrating a portion of a color control layer according to an exemplary embodiment of the present inventive concept.

[0058] Figure 1 A first direction axis DR1, a second direction axis DR2, and a third direction axis DR3 are illustrated. The direction axes described in this specification are relative and may extend in different directions in other exemplary embodiments. Figure 1 In the embodiment, the third direction axis DR3 may be defined as a direction in which an image is displayed from the display screen to a user. The first direction axis DR1 and the second direction axis DR2 are perpendicular to each other. The third direction axis DR3 may be perpendicular to a plane defined by the first direction axis DR1 and the second direction axis DR2.

[0059] refer to Figure 1 , the liquid crystal display device DD of the exemplary embodiment may include a liquid crystal display panel DP and a backlight unit BLU. The backlight unit BLU may be disposed on at least one side of the liquid crystal display panel DP. Figure 1 In the exemplary embodiment shown in , the backlight unit BLU is disposed on the bottom surface of the liquid crystal display panel DP and is arranged on the third direction axis DR3 with respect to the liquid crystal display panel.

[0060] The liquid crystal display panel DP displays images. Figure 1 In the exemplary embodiment shown in FIG. 1 , the liquid crystal display panel DP includes a first substrate SUB1 and a second substrate SUB2 facing each other. The liquid crystal layer LCL is disposed between the first substrate SUB1 and the second substrate SUB2.

[0061] The backlight unit BLU provides light to the liquid crystal display panel DP. The backlight unit BLU includes at least one light source LD that emits light for the liquid crystal display panel DP. In an exemplary embodiment, there may be a plurality of light sources LD, and the plurality of light sources LD may be disposed on a support member SF. The light guide layer LGL guides the light emitted by the at least one light source LD in the direction of the liquid crystal display panel DP (e.g., in the third direction DR3). The backlight unit BLU also includes a color control layer CCM and a protective layer PTL.

[0062] In the present inventive concept, the backlight unit BLU is an edge type backlight unit. The edge type backlight unit BLU may be configured such that the light source LD provides light to the side surface of the light guide layer LGL from below the liquid crystal display panel DP, and the light may be transmitted to the liquid crystal display panel DP through the light guide layer.

[0063] In an exemplary embodiment, the liquid crystal display device DD may further include a housing that receives the liquid crystal display panel DP and the backlight unit BLU. The housing may be provided in a manner that covers the backlight unit BLU and the liquid crystal display panel DP and exposes the upper surface of the second substrate SUB2 (e.g., the top surface in the third direction DR3) that is the display surface of the liquid crystal display panel. In addition, the housing may cover not only the side surface and the bottom surface of the liquid crystal display panel DP, but also a portion of the second substrate SUB2 that is the upper surface. For example, the housing may cover an edge portion of the upper surface of the second substrate SUB2 in the first direction DR1 and the second direction DR2.

[0064] Figure 2 According to an exemplary embodiment, Figure 1 2 is a cross-sectional view of a backlight unit BLU-1 taken along line II′ of the liquid crystal display device DD shown in FIG. Figure 2 A cross section of the backlight unit BLU-1 on a plane defined by the second direction axis DR2 and the third direction axis DR3 is shown.

[0065] In an exemplary embodiment, the backlight unit BLU-1 may include a light guide layer LGL having an incident surface LGL-F on which light is incident and an exit surface LGL-T from which light is emitted; a light source LD adjacent to or disposed on the incident surface LGL-F of the light guide layer LGL and configured to generate light; a low refractive layer LRL disposed on the exit surface LGL-T of the light guide layer LGL; a color control layer CCM disposed on the low refractive layer LRL; and a protective layer PTL disposed on the color control layer CCM. Figure 2In the embodiment, the light guide layer LGL, the low refractive layer LRL, the color control layer CCM, and the protection layer PTL may be disposed by sequentially laminating on the third direction axis DR3.

[0066] The light source LD disposed on the support SF emits light L to the surface of the light guide layer LGL. Figure 2 In the exemplary embodiment shown in , light L generated from the light source LD is incident on one side surface of the incident surface LGL-F. One side surface of the incident surface LGL-F may be an edge surface of the incident surface defined in the first direction DR1 and the third direction DR3. The light L incident from the light source LD is transmitted to one side surface of the exit surface LGL-T, and then is transmitted to the liquid crystal display panel DP. One side surface of the exit surface LGL-T may be an edge surface defined in the first direction DR1 and the second direction DR2. Figure 2 In the exemplary embodiment shown in FIG. 1 , a side surface of an incident surface LGL-F on which light L generated from a light source LD is incident is perpendicular to a side surface of an exit surface LGL-T to which the light is transmitted.

[0067] In an exemplary embodiment, the light guide layer LGL may be made of glass. However, the exemplary embodiments of the present inventive concept are not limited thereto. For example, in other embodiments, the light guide layer LGL may be made of a polymer resin and may be formed of a material including, for example, an acrylic resin, etc. The light guide layer may provide a substrate on which a low refractive layer LRL, a color control layer CCM, and a protective layer PTL to be described later are disposed.

[0068] The light guiding layer LGL may include a light guiding pattern portion GP. The light guiding pattern portion GP may be disposed on an opposite side of an exit surface LGL-T of the light guiding layer LGL on a third directional axis DR3. The light guiding pattern portion GP may transmit light incident on a side surface of the light guiding layer LGL emitted from the light source LD to another side surface of the light guiding layer LGL. Alternatively, the light guiding pattern portion GP may change the direction of the light so that the light is transmitted from the light guiding pattern portion in the direction of the exit surface LGL-T of the light guiding layer LGL.

[0069] exist Figure 2 In the cross-sectional view of FIG. 1 , the light guiding pattern portion GP is illustrated as having a cross section in a semicircular shape. However, exemplary embodiments of the inventive concept are not limited thereto. For example, in other exemplary embodiments, the light guiding pattern portion GP may have a cross section having an inclined surface. Figure 2Different from the examples shown in , one or more of the multiple light guiding pattern portions GP may have different sizes from each other. In addition, the arrangement density of the light guiding pattern portions GP provided on the light guiding layer LGL may vary in different parts of the light guiding layer. For example, based on the distance from the light source LD, the density of the light guiding pattern portions GP may be relatively large or small. In one embodiment, the density of the light guiding pattern portions GP provided on the light guiding layer LGL may increase as the distance from the light source decreases.

[0070] The light guiding pattern portion GP may protrude from one side surface of the light guiding layer LGL (for example, in the third direction DR3) and may be formed integrally with the light guiding layer LGL. However, in other exemplary embodiments, the light guiding pattern portion GP may be a recessed pattern defined by being recessed from one side surface of the light guiding layer LGL toward the exit surface LGL-T in the third direction axis DR3.

[0071] The low refractive layer LRL may be disposed on the light guiding layer LGL. In an exemplary embodiment, the low refractive layer LRL may be directly disposed on the light guiding layer LGL, and may contact the exit surface LGL-T of the light guiding layer LGL. For example, the low refractive layer LRL may be formed by coating on the exit surface LGL-T of the light guiding layer LGL. In an exemplary embodiment, the coating method for forming the low refractive layer LRL may be slit coating, spin coating, roller coating, spray coating, inkjet printing, or the like. However, the method for providing the low refractive layer LRL is not limited to coating on the exit surface LGL-T of the light guiding layer LGL. In alternative embodiments, the low refractive layer LRL may be directly disposed on the light guiding layer LGL by various other methods (e.g., a transfer method).

[0072] The refractive index of the low refractive layer LRL may be lower than the refractive index of the light guiding layer LGL. The refractive index of the low refractive layer LRL may be lower than the refractive indexes of the light guiding layer LGL and the color control layer CCM. In an exemplary embodiment, the refractive index of the low refractive layer LRL may be 1.2 to 1.4. For example, the refractive index of the low refractive layer LRL may be 1.2 to 1.25. In an exemplary embodiment, the refractive index of the light guiding layer may be 1.4 to 1.8. The difference in refractive index between the low refractive layer LRL and the light guiding layer LGL may be 0.2 or more.

[0073] The low refractive layer LRL may include any material having the above refractive index. For example, the low refractive layer LRL may include fine particles having voids, such as hollow silica.

[0074] Since the low refractive layer LRL has a lower refractive index than the light guide layer LGL, the light incident from the light source LD on the light guide layer LGL can be effectively transmitted to the exit surface LGL-T of the light guide layer LGL, which is relatively separated from the light source LD. Since the low refractive layer LRL has a lower refractive index of 1.2 to 1.4 than the light guide layer LGL, total reflection is effectively performed at the boundary between the light guide layer LGL and the low refractive layer LRL, so that the light emitted from the light source LD can be effectively transmitted to the exit surface LGL-T of the light guide layer LGL, which is relatively separated from the light source LD.

[0075] The color control layer CCM may be disposed on the light guide layer LGL and the low refractive layer LRL. Figure 2 In the exemplary embodiment shown in FIG. 1 , the color control layer CCM may be directly disposed on the low refractive layer LRL. The color control layer CCM may change the color of the light provided from the light source LD and transmit the light having the changed color to the liquid crystal layer LCL. For example, the light provided from the light source LD may be changed into white light by the color control layer CCM and then provided to the liquid crystal layer LCL as white light. Figure 3A and Figure 3B The color control layer CCM is described in detail.

[0076] exist Figure 3A In the exemplary embodiment shown in , the color control layer CCM-1 may include a matrix resin BR and quantum dots QD. The quantum dots QD may be dispersed in the matrix resin BR.

[0077] The matrix resin BR is a medium in which at least one quantum dot QD is dispersed. The matrix resin BR can be formed of various resin compositions that can be generally referred to as adhesives. However, the exemplary embodiments of the inventive concept are not limited thereto. In this specification, as long as the medium can disperse and set quantum dots QD, any medium can be referred to as a matrix resin BR regardless of its name, additional functions, constituent materials, etc. The matrix resin BR can be a polymer resin. For example, the matrix resin BR can be an acrylic resin, a urethane-based resin, a silicone-based resin, or an epoxy resin, etc. The matrix resin BR can be a transparent resin.

[0078] Quantum dots QD can be used to convert light from LD (see Figure 2) is a particle with a wavelength of light provided by a quantum dot QD. Quantum dot QD is a material with a crystal structure of several nanometers in size and is composed of hundreds to thousands of atoms. Due to its small size, quantum dot QD exhibits a quantum confinement effect in which the energy band gap increases. When light with a wavelength of higher energy than the band gap is incident on the quantum dot QD, the quantum dot QD is excited by absorbing the light and falls to the ground state by emitting light of a specific wavelength. The wavelength of the emitted light has a value corresponding to the band gap. When the size and composition of the quantum dot QD are adjusted, the light emission characteristics caused by the quantum confinement effect can be adjusted.

[0079] The core of the quantum dot QD may be one or more compounds selected from the group consisting of II-VI compounds, III-V compounds, IV-VI compounds, IV elements, IV compounds, and combinations thereof.

[0080] The II-VI compound may be one or more compounds selected from the group consisting of: a binary compound selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; a ternary compound selected from the group consisting of AgInS, CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe e, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof; and a quaternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0081] The III-V compound may be one or more compounds selected from the group consisting of: a binary compound, the binary compound being selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof; a ternary compound, the ternary compound being selected from the group consisting of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNP, InNAs, InNSb, InPAs, InPSb and mixtures thereof; and a quaternary compound, the quaternary compound being selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and mixtures thereof.

[0082] The IV-VI compound may be one or more compounds selected from the group consisting of: a binary compound selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof; a ternary compound selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof; a quaternary compound selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof. The IV group element may be selected from the group consisting of Si, Ge and mixtures thereof. The IV group compound may be a binary compound selected from the group consisting of SiC, SiGe and mixtures thereof.

[0083] Binary, ternary, or quaternary compounds may be present in a particle with a uniform concentration distribution, or may be present in the same particle with a non-uniform concentration (e.g., partially non-uniform or non-uniform throughout the core). In addition, quantum dots may have a core / shell structure, in which one quantum dot surrounds another quantum dot. The interface between the core and the shell may have a concentration gradient, in which the concentration of the element present in the shell becomes smaller toward the center.

[0084] In some exemplary embodiments, quantum dots may have a core-shell structure including a core having nanocrystals described above and a shell surrounding the core. The shell of the quantum dot may provide a protective layer to prevent chemical deformation of the core. The protective layer maintains the semiconductor properties of the quantum dot and / or a charging layer of the quantum dot that imparts electrophoretic properties. The shell may be a single layer or multiple layers. The interface between the core and the shell may have a concentration gradient, wherein the concentration of the element present in the shell becomes smaller toward the center. In an exemplary embodiment, the shell of the quantum dot may be a metal or non-metal oxide, a semiconductor compound, or a combination thereof.

[0085] For example, the metal or nonmetal oxide of the quantum dot shell can be a binary compound (e.g., SiO 2 、Al 2 O 3 、TiO 2 、ZnO、MnO、Mn 2 O 3 , Mn 3 O 4 , CuO, FeO, Fe 2 O 3 , Fe 3 O 4 , CoO, Co 3 O 4 and NiO) and ternary compounds (such as MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 and CoMn 2 O 4 ) or more than one thereof. However, the exemplary embodiments of the inventive concept are not limited thereto.

[0086] In an exemplary embodiment, the semiconductor compound may be one or more compounds selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc. However, exemplary embodiments of the present inventive concept are not limited thereto.

[0087] The quantum dot may have a full width at half maximum (FWHM) of a light emission spectrum of about 45 nm or less. For example, the FWHM of the light emission spectrum of the quantum dot may be about 40 nm or less. The FWHM of the light emission spectrum of the quantum dot may be about 30 nm or less, and color purity or color reproducibility may be improved within the above range. In addition, the light emitted by the quantum dot is emitted in all directions, so that a wide viewing angle may be improved.

[0088] In addition, the quantum dot may be in the form of spherical, pyramidal, multi-armed or cubic nanoparticles, and may use nanotubes, nanowires, nanofibers, nanoparticles, etc. However, the form of the quantum dot is not particularly limited thereto.

[0089] Quantum dots can control the color of emitted light according to their particle size. Therefore, quantum dots can have various light emission colors, such as blue, red, green, etc.

[0090] In an embodiment, the color control layer CCM-1 may further include scattering particles FP. In an exemplary embodiment, the scattering particles FP may be TiO 2 Or silica-based nanoparticles. The scattering particles FP may scatter light emitted from the quantum dots QD so that the light is transmitted to the outside of the color control layer CCM-1.

[0091] exist Figure 3B In the exemplary embodiment shown in , the color control layer CCM-2 may include a plurality of quantum dots QD1 and quantum dots QD2 that convert incident light into light having different wavelengths. For example, the color control layer CCM-2 includes a first quantum dot QD1 that is used to convert incident light having a specific wavelength into light having a first wavelength and emit the light. The color control layer CCM-2 also includes a second quantum dot QD2 that converts incident light having a specific wavelength into light having a second wavelength and emits the light.

[0092] For example, when the color control layer CCM-2 includes a plurality of quantum dots QD and is illuminated from the light source LD (see Figure 2 ) is light in the blue wavelength region, the first quantum dot QD1 can convert the blue light into light of green wavelength, and the second quantum dot QD2 can convert the blue light into light of red wavelength. Figure 2) is blue light with a maximum emission peak of 420nm to 470nm, the first quantum dot QD1 can emit green light with a maximum emission peak of 520nm to 570nm, and the second quantum dot QD2 can emit red light with a maximum emission peak of 620nm to 670nm. However, it should be understood that blue light, green light, and red light are not limited to the examples of wavelength regions presented above, but include all wavelength regions that can be identified as blue light, green light, and red light in the art. The combination of red light and green light emitted by a variety of quantum dots and blue light emitted from the light source can provide white for the color of light emitted by the color control layer CCM-2.

[0093] At the same time, the color of the emitted light may vary depending on the particle size of the quantum dot QD1 and the quantum dot QD2. The particle size of the first quantum dot QD1 and the particle size of the second quantum dot QD2 may be different from each other. For example, the particle size of the first quantum dot QD1 may be smaller than the particle size of the second quantum dot QD2. In this embodiment, the first quantum dot QD1 may emit light having a shorter wavelength than the light emitted by the second quantum dot QD2. However, in other embodiments, the particle size of the second quantum dot QD2 may be smaller than the particle size of the first quantum dot QD1, and the second quantum dot QD2 may emit light having a shorter wavelength than the light emitted by the first quantum dot QD1.

[0094] Return to reference Figure 2 , the color control layer CCM can be directly disposed on the low refractive layer LRL. For example, in an exemplary embodiment, the color control layer CCM can be formed by coating on the low refractive layer LRL. In an exemplary embodiment, the method for coating the color control layer CCM on the low refractive layer LRL can be slit coating, spin coating, roller coating, spray coating, inkjet printing, etc. However, in an alternative embodiment, the color control layer CCM can be disposed on the low refractive layer LRL by other methods. The color control layer CCM can be provided with a thickness of 0.5 μm to 100 μm. For example, the color control layer CCM can have a thickness of 20 μm to 80 μm.

[0095] The protection layer PTL may be disposed on the color control layer CCM. Figure 2 In the exemplary embodiment shown in FIG. 1 , the protective layer PTL is directly disposed on the color control layer CCM. The protective layer PTL can protect the color control layer CCM. Figure 4A and Figure 4B The protection layer PTL is described in detail.

[0096] Figure 4A is a photograph of a cross section of a protective layer according to a comparative example. Figure 4Bis a photograph of a cross-section of a protective layer including a resin composition including a repeating unit represented by Formula 1 according to an exemplary embodiment of the present inventive concept.

[0097] In the present specification, -* indicates a position to be connected, such as a binding site with an adjacent atom.

[0098] In this specification, "substituted or unsubstituted" may mean substituted by one or more than one substituent or unsubstituted. The substituent may be selected from the group consisting of deuterium atoms, halogen atoms, cyano groups, nitro groups, amine groups, silyl groups, boron groups, phosphine oxide groups, phosphine sulfide groups, alkyl groups, alkenyl groups, aryl groups and heterocyclic groups. In addition, each of the substituents exemplified above may be substituted or unsubstituted. For example, a biphenyl group may be interpreted as an aryl group, and may be interpreted as a phenyl group substituted by a phenyl group.

[0099] In the present specification, examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

[0100] In an exemplary embodiment, the number of carbon atoms of the amine group can be 1 to 30. However, the number of carbon atoms of the amine group is not particularly limited thereto. The amine group can include an alkylamine group and an arylamine group. Examples of amine groups include methylamine groups, dimethylamine groups, phenylamine groups, naphthylamine groups, 9-methyl-anthrylamine groups, triphenylamine groups, etc. However, the amine group is not limited to these examples.

[0101] In the present specification, the alkyl group may be linear, branched or cyclic. In an exemplary embodiment, the number of carbon atoms in the alkyl group is 1 to 30, 1 to 20, 1 to 10 or 1 to 6. Examples of the alkyl group may include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an isobutyl group, a 2-ethylbutyl group, a 3,3-dimethylbutyl group, an n-pentyl group, an isopentyl group, a neopentyl group, a tert-pentyl group, a cyclopentyl group, a 1-methylpentyl group, a 3-methylpentyl group, a 2-ethylpentyl group, a 4-methyl-2-pentyl group, an n-hexyl group, a 1-methylhexyl group, a 2-ethyl hexyl group, 2-butylhexyl group, cyclohexyl group, 4-methylcyclohexyl group, 4-tert-butylcyclohexyl group, n-heptyl group, 1-methylheptyl group, 2,2-dimethylheptyl group, 2-ethylheptyl group, 2-butylheptyl group, n-octyl group, tert-octyl group, 2-ethyloctyl group, 2-butyloctyl group, 2-hexyloctyl group, 3,7-dimethyloctyl group, cyclooctyl group, n-nonyl group, n-decyl group, adamantyl group, 2-ethyldecyl group, The alkyl group may be alkyl or alkyl-alkyl groups, such as alkyl groups, ...

[0102] In this specification, alkenyl groups can be straight or branched. In an exemplary embodiment, the number of carbon atoms of the alkenyl group can be 2 to 30, 2 to 20 or 2 to 10. However, the number of carbon atoms of the alkenyl group is not particularly limited thereto. Examples of alkenyl groups include vinyl groups, 1-butenyl groups, 1-pentenyl groups, 1,3-butadienyl aryl groups, styryl groups, styryl vinyl groups, etc. However, alkenyl groups are not limited to these examples.

[0103] In this specification, cycloalkyl group can be a ring type alkyl group. In an exemplary embodiment, the number of carbon atoms of the cycloalkyl group is 3 to 50, 3 to 30, 3 to 20, 3 to 12 or 3 to 6. The example of cycloalkyl group includes cyclopropyl group, cyclobutyl group, cyclopentyl group, 3-methylcyclopentyl group, 2,3-dimethylcyclopentyl group, cyclohexyl group, 3-methylcyclohexyl group, 4-methylcyclohexyl group, 2,3-dimethylcyclohexyl group, 3,4,5-trimethylcyclohexyl group, 4-tert-butylcyclohexyl group, cycloheptyl group, cyclooctyl group etc. However, cycloalkyl group is not limited to these examples.

[0104] In this specification, heterocycloalkyl group can be a heterocycloalkyl group containing one or more than one of O, N, P, Si and S as a heteroatom. In exemplary embodiments, the number of carbon atoms of the heterocycloalkyl group is 2 to 50, 2 to 30, 2 to 20, 2 to 12 or 2 to 6, and the number of heteroatoms forming the ring of the heterocycloalkyl group can be 1 to 10 or 1 to 5 (e.g., 1, 2, 3, 4 or 5). The example of heterocycloalkyl group includes tetrahydrofuran, pyrrolidine, thiolane, tetrahydropyran etc. However, heterocycloalkyl group is not limited to these examples.

[0105] In this specification, an aryl group means any functional group or substituent derived from an aromatic hydrocarbon ring. The aryl group may be a monocyclic aryl group or a polycyclic aryl group. In an exemplary embodiment, the number of ring-forming carbon atoms of the aryl group may be 6 to 60, 6 to 30, 6 to 20, or 6 to 15. Examples of aryl groups may include phenyl groups, naphthyl groups, fluorenyl groups, anthracenyl groups, phenanthrenyl groups, biphenyl groups, terphenyl groups, quaterphenyl groups, pentaphenyl groups, hexaphenyl groups, triphenylene groups, pyrenyl groups, benzofluoranthenyl groups, However, the aryl group is not limited to these examples.

[0106] In this specification, the heteroaryl group can be a heteroaryl group containing one or more than one of B, O, N, P, Si and S as a heteroatom. In an exemplary embodiment, the number of ring-forming carbon atoms of the heteroaryl group can be 2 to 30 or 2 to 20, and the number of heteroatoms forming the ring of the heteroaryl group can be 1 to 10 or 1 to 5 (e.g., 1, 2, 3, 4 or 5). The heteroaryl group can be a monocyclic heteroaryl group or a polycyclic heteroaryl group. The polycyclic heteroaryl group can have, for example, a bicyclic structure or a tricyclic structure. Examples of the heteroaryl group may include a thienyl group, a furanyl group, a pyrrolyl group, an imidazolyl group, a thiazolyl group, an oxazolyl group, an oxadiazolyl group, a triazolyl group, a pyridyl group, a bipyridyl group, a pyrimidyl group, a triazinyl group, an acridinyl group, a pyridazinyl group, a pyrazinyl group, a quinolyl group, a quinazolinyl group, a quinoxalinyl group, a phenoxazinyl group, a phthalazinyl group, a pyridopyrimidinyl group, a pyridopyraz ... A razinopyrazinyl group, an isoquinolyl group, an indolyl group, a carbazolyl group, an N-arylcarbazolyl group, an N-heteroarylcarbazolyl group, an N-alkylcarbazolyl group, a benzoxazolyl group, a benzimidazolyl group, a benzothiazolyl group, a benzocarbazolyl group, a benzothienyl group, a dibenzothienyl group, a thienothiphenyl group, a benzofuranyl group, a phenanthrolinyl group, an isoxazolyl group, a thiadiazolyl group, a phenothiazinyl group, a dibenzosilyl group, a dibenzofuranyl group, etc. However, the heteroaryl group is not limited to these examples.

[0107] In exemplary embodiments, the number of ring-forming carbon atoms of the aryloxy group may be 6 to 30, 6 to 20, or 6 to 15. Specific examples of the aryloxy group include phenoxy, naphthoxy, anthryloxy, phenanthrenoxy, fluorenyloxy, indenyloxy, etc. However, the aryloxy group is not limited thereto.

[0108] In an exemplary embodiment, the protective layer PTL may include a resin composition including polysilsesquioxane. Specifically, the resin composition includes a first repeating unit represented by Formula 1 below.

[0109] [Formula 1]

[0110]

[0111] In formula 1, R 1 and R 2Each of the following is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cyclopentyl group having 3 to 12 carbon atoms, The substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, the substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, the substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, the substituted or unsubstituted aralkyl group having 6 to 30 ring carbon atoms, the substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, or the substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms. The acrylic acid group may be a substituted or unsubstituted acrylic acid group. The methacrylic acid group may be a substituted or unsubstituted methacrylic acid group. The isocyanate group may be a substituted or unsubstituted isocyanate group.

[0112] R in the repeating unit of Formula 1 1 and R 2 Each of the R in the preceding or subsequent repeating unit may be different from the corresponding R in the preceding or subsequent repeating unit. 1 and R 2 However, the R 1 and R 2 Each of the R 1 and R 2 same.

[0113] The protective layer PTL may have increased strength by including a resin composition containing a first repeating unit represented by Formula 1. The protective layer PTL having increased strength may effectively protect the color control layer CCM, which is susceptible to scratches and other damage during the execution of the manufacturing process and various other processes. The scratched or damaged color control layer CCM may cause degradation of the quantum dots due to the penetration of external oxygen and / or moisture. Degradation of the quantum dots of the color control layer CCM may result in the generation of black dots or white dots in the image provided by the liquid crystal display device. The protective layer PTL of the present invention may effectively protect the color control layer CCM and prevent the generation of scratches, etc. in the color control layer CCM during the manufacturing process and various other processes.

[0114] In an exemplary embodiment, the protective layer PTL may include a resin composition including two or more types of polysilsesquioxanes having different repeating units. For example, the resin composition may further include a second repeating unit represented by Formula 2 below.

[0115] [Formula 2]

[0116]

[0117] In formula 2, R 3 To R 6 Each of the following is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cyclopentyl group having 3 to 12 carbon atoms, The substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, the substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, the substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, the substituted or unsubstituted aralkyl group having 6 to 12 ring carbon atoms, the substituted or unsubstituted aryloxy group having 6 to 12 ring carbon atoms, or the substituted or unsubstituted arylthio group having 6 to 12 ring carbon atoms. The acrylic acid group may be a substituted or unsubstituted acrylic acid group. The methacrylic acid group may be a substituted or unsubstituted methacrylic acid group. The isocyanate group may be a substituted or unsubstituted isocyanate group. R of Formula 2 3 To R 6 They may be different from or the same as each other in each repeating unit.

[0118] In the resin composition including the first repeating unit and the second repeating unit, a molar ratio of the first repeating unit to the second repeating unit may be 1:1000 to 1000:1.

[0119] In an exemplary embodiment, the resin composition may further include a third repeating unit represented by Formula 3 below.

[0120] [Formula 3]

[0121]

[0122] In formula 3, X is OR 12 or O(SiO 3 / 2 R 13 ) 4+2n, and R 7 To R 13 Each of the following is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cyclopentyl group having 3 to 12 carbon atoms, The substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, the substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, the substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, the substituted or unsubstituted aralkyl group having 6 to 12 ring carbon atoms, the substituted or unsubstituted aryloxy group having 6 to 12 ring carbon atoms, or the substituted or unsubstituted arylthio group having 6 to 12 ring carbon atoms. n is an integer of 0 or greater. The acrylic acid group may be a substituted or unsubstituted acrylic acid group. The methacrylic acid group may be a substituted or unsubstituted methacrylic acid group. The isocyanate group may be a substituted or unsubstituted isocyanate group. R of Formula 3 7 To R 13 They may be different from or the same as each other in each repeating unit.

[0123] In the resin composition including the first repeating unit and the third repeating unit, a molar ratio of the first repeating unit to the third repeating unit may be 1:1000 to 1000:1.

[0124] In an exemplary embodiment, the resin composition may include a first repeating unit, a second repeating unit, and a third repeating unit. In the resin composition including the first repeating unit, the second repeating unit, and the third repeating unit, the molar ratio of each of the first repeating unit, the second repeating unit, and the third repeating unit relative to the other two units may be 1:1000:1000 to 1000:1:1.

[0125] In an exemplary embodiment, the protection layer PTL may further include silica particles. The protection layer PTL including the silica particles may have improved strength. The size of the silica particles may be 50 nm to 15 μm, but is not limited thereto.

[0126] In an exemplary embodiment, the resin composition may be a thermosetting resin or a photocurable resin. The resin composition may include a thermosetting functional group or a photocurable functional group. For example, the thermosetting functional group or the photocurable functional group may be an acrylic group or a methacrylic group. However, the exemplary embodiment is not limited thereto.

[0127] The protective layer PTL may be formed by applying a resin composition and then subjecting it to a thermal or photocuring process. The protective layer PTL may be provided with a thickness of 1 μm to 10 μm. The thickness may be a length from a top surface to a bottom surface of the protective layer PTL in the third direction DR3.

[0128] Table 1 is the result of measuring the pencil hardness of the protective layer according to the example and the comparative example. The pencil hardness was measured by setting the moving speed of the pencil to 1 mm / sec when the contact angle of the pencil was 45 degrees under a load of 1 kg. Figure 4A and Figure 4B are photographs of cross sections of the protective layers according to Examples and Comparative Examples after abrasion resistance tests were performed on each cross section thereof. Figure 4A is a photograph of a cross section of a protective layer according to a comparative example, and Figure 4B is a photograph of a cross section of a protective layer according to an exemplary embodiment of the present invention. Abrasion resistance was evaluated based on the presence or absence of scratches after reciprocating steel wool #0000 10 times under a load of 1.5 kg.

[0129] [Table 1]

[0130]

[0131] The protective layer according to the comparative example includes a polyimide resin, which is generally used as a protective film of a color control layer in the related art. As shown in Table 1, the pencil hardness of the protective layer according to the comparative example was measured to be 1H. Figure 4A The photograph shown in shows that the protective layer of the comparative example has a plurality of scratches as a result of the evaluation of the wear resistance.

[0132] On the other hand, the protective layers according to Examples 1 to 4 were all measured to have a pencil hardness of 5H or more. Figure 4B The photographs shown in show that, based on the results of the anti-wear evaluation, the protective layer according to the exemplary embodiment of the present inventive concept has no scratches, the protective layer including the resin composition including the repeating unit represented by Formula 1. Therefore, the protective layer according to the exemplary embodiment of the present inventive concept has increased strength, and thus, can effectively protect the color control layer.

[0133] Return to reference Figure 2, the protective layer PTL may be directly disposed on the color control layer CCM. However, the exemplary embodiments of the inventive concept are not limited thereto. For example, a barrier layer may be disposed between the protective layer PTL and the color control layer CCM. The protective layer PTL may be disposed in the outermost area of ​​the backlight unit BLU to serve as a protective layer. For example, the protective layer PTL may be disposed on the top edge of the backlight unit BLU defined by the first direction DR1 and the second direction DR2.

[0134] Figure 5A and Figure 5B 1 is a cross-sectional view showing a backlight unit according to an exemplary embodiment of the inventive concept. Figure 5A and Figure 5B The backlight unit BLU-2 and the backlight unit BLU-3 of the exemplary embodiment shown in FIG. Figure 2 The backlight unit BLU-1 of the exemplary embodiment shown in FIG. Figures 1 to 4B Detailed description of the same compositions as those described.

[0135] The backlight unit BLU-2 and the backlight unit BLU-3 may further include at least one of the barrier layer BAL1 and the barrier layer BAL2. At least one of the barrier layer BAL1 and the barrier layer BAL2 may be disposed adjacent to one surface of the color control layer CCM. For example, each of the barrier layer BAL1 and the barrier layer BAL2 may be disposed on one of the opposite edge surfaces of the backlight unit BLU defined by the first direction DR1 and the second direction DR2 and spaced apart in the third direction DR3.

[0136] The barrier layer BAL1 and the barrier layer BAL2 prevent the penetration of moisture and / or oxygen. The barrier layer BAL1 and the barrier layer BAL2 may include at least one inorganic layer. The barrier layer BAL1 and the barrier layer BAL2 may be formed by including an inorganic material. For example, the barrier layer BAL1 and the barrier layer BAL2 may be formed by including silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide and silicon oxynitride, or a metal film with light transmittance, etc. However, the exemplary embodiments of the present inventive concept are not limited thereto. The barrier layer BAL1 and the barrier layer BAL2 may further include an organic film. The barrier layer BAL1 and the barrier layer BAL2 may each be formed by a single layer or multiple layers (e.g., multiple laminated layers arranged in the third direction DR3).

[0137] exist Figure 5AIn the exemplary embodiment shown in , the backlight unit BLU-2 may include a first barrier layer BAL1 disposed between the color control layer CCM and the protective layer PTL. The first barrier layer BAL1 may be directly disposed on the color control layer CCM, or may be in contact with the protective layer PTL. The first barrier layer BAL1 is illustrated as a single layer. However, the exemplary embodiments of the inventive concept are not limited thereto. The first barrier layer BAL1 may include a plurality of layers. When the first barrier layer BAL1 includes a plurality of layers, the first barrier layer BAL1 may include a plurality of inorganic films, or may include both inorganic films and organic films.

[0138] exist Figure 5B In the exemplary embodiment shown in , the backlight unit BLU-3 may include a first barrier layer BAL1 disposed between the color control layer CCM and the protective layer PTL. The backlight unit BLU-3 further includes a second barrier layer BAL2 disposed between the low reflection layer LRL and the color control layer CCM. The second barrier layer BAL2 may be directly disposed on the low reflection layer LRL, or may be in contact with the color control layer CCM. The second barrier layer BAL2 is illustrated as a single layer. However, the exemplary embodiments of the inventive concept are not limited thereto. The second barrier layer BAL2 may include a plurality of layers. When the second barrier layer BAL2 includes a plurality of layers, the second barrier layer BAL2 may include a plurality of inorganic films, or may include both inorganic films and organic films.

[0139] Figure 6 is an exemplary embodiment according to the present invention. Figure 1 A cross-sectional view of the liquid crystal display taken along line II-II'. Figure 7 is a cross-sectional view of a liquid crystal display panel according to an exemplary embodiment of the inventive concept.

[0140] exist Figure 6 In the exemplary embodiment shown in , the backlight unit BLU includes a light guide layer LGL, a low refractive layer LRL disposed on the light guide layer, a color control layer CCM disposed on the low refractive layer, and a protective layer PTL disposed on the color control layer. A first substrate SUB1 is disposed on the backlight unit BLU. The first substrate SUB1 includes a first base substrate BL1 and a circuit layer CL. A second substrate SUB2 is disposed on the liquid crystal layer LCL. The second substrate SUB2 includes a second base substrate BL2, a color filter layer CF, and a polarization layer POL. The liquid crystal layer LCL is disposed between the first substrate SUB1 and the second substrate SUB2.

[0141] exist Figure 7In the exemplary embodiment shown in , the liquid crystal display panel includes a first substrate SUB1 and a second substrate SUB2 that are spaced apart from each other. For example, the first substrate SUB1 and the second substrate SUB2 may be spaced apart from each other in the third direction DR3. The liquid crystal layer LCL is disposed between the first substrate SUB1 and the second substrate SUB2. However, the structure of the liquid crystal display panel is not limited thereto. For example, the first base substrate BL1 and the second base substrate BL2 may be reversed.

[0142] The first substrate SUB1 may include a first base substrate BL1, and may include a circuit layer CL disposed closer to the liquid crystal layer LCL (eg, in the third direction DR3) than the first base substrate BL1.

[0143] The first base substrate BL1 may be a polymer substrate, a plastic substrate, a glass substrate or a quartz substrate. The first base substrate BL1 may be a transparent insulating substrate. The first base substrate BL1 may be rigid or flexible. The first base substrate BL1 may provide a base material on which the circuit layer CL and the like are disposed.

[0144] The circuit layer CL may include a gate line, a storage line, and an electrode for forming an electric field in the liquid crystal layer LCL. The transistor T includes a gate electrode GE, an active cell overlapping the gate electrode GE, a source electrode SE connected to the data line DAL, and a drain electrode DE disposed apart from the source electrode SE (e.g., in the first direction DR1). A semiconductor pattern SM is provided on the gate electrode GE, with a gate insulating film GI interposed therebetween. Some regions of the semiconductor pattern SM overlap with the gate electrode GE. The semiconductor pattern SM includes an active pattern provided on the gate insulating film GI and an ohmic contact layer formed on the active pattern. The ohmic contact layer includes ohmic contacts between the active pattern, the source electrode SE, and the drain electrode DE, respectively.

[0145] The source electrode SE is branched from the data line DAL. The source electrode SE is formed on the ohmic contact layer, and some regions of the source electrode SE overlap with the gate electrode GE. The data line DAL may be disposed on a region of the gate insulating film GI on which the semiconductor pattern SM is not disposed.

[0146] The drain electrode DE is disposed apart from the source electrode SE (eg, in the first direction DR1 ) with the semiconductor pattern SM interposed therebetween. The drain electrode DE is formed on the ohmic contact layer, and a region of the source electrode SE is provided overlapping the gate electrode GE (eg, in the third direction DR3 ).

[0147] Therefore, the upper surface of the active pattern between the source electrode SE and the drain electrode DE is exposed and becomes a channel portion defining a conductive channel between the source electrode SE and the drain electrode DE according to whether a voltage is applied to the gate electrode GE. Except for the channel portion formed by separating the source electrode SE and the drain electrode DE, the source electrode SE and the drain electrode DE overlap a portion of the semiconductor pattern SM in the region.

[0148] The pixel electrode PE is connected to the drain electrode DE with a protective film PSV interposed therebetween. The protective film PSV covers the source electrode SE, the drain electrode DE, the channel portion, and the gate insulating film GI, and has a contact hole CH exposing a portion of the drain electrode DE. The protective film PSV may include, for example, silicon nitride or silicon oxide. However, the exemplary embodiment of the protective film PSV is not limited thereto. The pixel electrode PE is connected to the drain electrode DE through the contact hole CH formed on the protective film PSV. The pixel electrode PE is formed of a transparent conductive material.

[0149] The liquid crystal layer LCL is disposed between the first substrate SUB1 and the second substrate SUB2, and includes a plurality of liquid crystal molecules. Liquid crystal molecules having dielectric anisotropy are arranged in the liquid crystal layer LCL. In the liquid crystal layer LCL, any liquid crystal molecules may be used without particular limitation. For example, alkenyl-based liquid crystal compounds or alkoxy-based liquid crystal compounds may be used as liquid crystal molecules. The liquid crystal molecules used in the exemplary embodiment may have negative dielectric anisotropy, but the exemplary embodiments of the inventive concept are not limited thereto. For example, liquid crystal molecules having positive dielectric anisotropy may be used.

[0150] One or more insulating layers may be disposed on one surface of the first base substrate BL1. An alignment film may also be disposed between the first base substrate BL1 and the liquid crystal layer LCL. The alignment film may control an alignment angle of liquid crystal injected into the liquid crystal layer LCL.

[0151] The second substrate SUB2 may include a second base substrate BL2 and a color filter layer CF, a common electrode CE, and a polarization layer POL disposed on a lower surface (eg, in the third direction DR3 ) of the second base substrate BL2 .

[0152] The second base substrate BL2 may be a polymer substrate, a plastic substrate, a glass substrate or a quartz substrate. The second base substrate BL2 may be a transparent insulating substrate. The second base substrate BL2 may be rigid or flexible. The second base substrate BL2 may provide a base material on which a color filter layer CF or the like is disposed.

[0153] The color filter layer CF may be disposed on the lower surface of the second base substrate BL2. The color filter layer CF may include a filter CF1 for transmitting light of a predetermined wavelength region. The plurality of color filter layers CF may include a plurality of filters, in which case each color filter may transmit light of a different wavelength region. For example, the color filter layer CF may include a red filter, a green filter, and a blue filter. However, exemplary embodiments of the inventive concept are not limited thereto.

[0154] The color filter layer CF may further include a light blocking unit BM for preventing light leakage by blocking light. The light blocking unit BM may be a black matrix. The light blocking unit BM may include an organic light blocking material or an inorganic light blocking material, both of which include a black pigment or a black dye. In an exemplary embodiment in which the color filter layer CF includes a plurality of filters, the light blocking unit BM may be disposed between adjacent filters to separate such filters. The light blocking unit BM may be disposed to overlap with the boundaries of adjacent filters.

[0155] The common electrode CE may be disposed on the lower side of the color filter layer CF (e.g., in the third direction DR3). The common electrode CE is illustrated as being directly disposed on the lower surface of the color filter layer CF. However, the exemplary embodiments of the present invention are not limited thereto. For example, at least one insulating layer may be further disposed between the common electrode CE and the color filter layer CF. The common electrode CE controls the liquid crystal layer LCL by forming an electric field with the pixel electrode PE. In the exemplary embodiments of the present invention, the common electrode CE is illustrated as being disposed on the second base substrate BL2. However, the exemplary embodiments of the present invention are not limited thereto. The common electrode CE may be disposed on the first base substrate BS1.

[0156] The polarization layer POL may be disposed on the lower side of the common electrode CE (e.g., in the third direction DR3). The polarization layer POL may be a coating-type polarization layer, or may be formed by deposition. Alternatively, the polarization layer POL may be a film-type polarization member that has been prepared separately and provided on the second base substrate BL2. However, the exemplary embodiments of the present inventive concept are not limited thereto. For example, the display panel may include one or more than one polarization layer POL, or may not include the polarization layer POL. Figure 7 In the exemplary embodiment shown in , the polarization layer POL is illustrated as being disposed on the second base substrate BL2. However, the exemplary embodiments of the inventive concept are not limited thereto. For example, the polarization layer POL may be disposed between the color filter layer CF and the second base substrate BL2. Alternatively, the polarization layer POL may be disposed within the first substrate SUB1, on the lower portion of the first substrate SUB1, or on the upper portion of the second substrate SUB2. In addition, the polarization layer POL may include a polarizer layer and at least one protective layer for protecting the polarizer layer.

[0157] In this embodiment, a liquid crystal display panel in a vertical alignment mode is exemplarily described. However, in an exemplary embodiment of the present invention, a liquid crystal display panel in any one of an in-plane switching mode, a fringe field switching (FFS) mode, a plane-to-line switching (PLS) mode, a super vertical alignment (SVA) mode, and a surface-stabilized vertical alignment (SS-VA) mode can be applied.

[0158] At the same time, reference Figure 1 , Figure 6 and Figure 7 The described exemplary embodiments of the liquid crystal display panel are exemplary. The configuration of each of the first substrate SUB1 and the second substrate SUB2 may be modified in various ways within the scope of the inventive concept.

[0159] The backlight unit of the exemplary embodiment described above and the liquid crystal display device including the backlight unit include a light guide layer, a color control layer and a protective layer, thereby effectively protecting the color control layer. Therefore, the reliability problem caused by the color control layer being exposed to the external environment can be prevented. In addition, since the color control layer containing quantum dots is introduced into the backlight unit, the display quality can be improved.

[0160] Exemplary embodiments of the inventive concept may provide a backlight unit having improved reliability by protecting a color control layer from an external environment.

[0161] Exemplary embodiments of the inventive concept may provide a liquid crystal display device having excellent color reproducibility and display quality.

[0162] While the present inventive concepts have been described with reference to preferred embodiments thereof, those skilled in the art will understand that various changes in form and details may be made therein without departing from the spirit and scope of the present inventive concepts.

[0163] Therefore, the technical scope of the inventive concept is not intended to be limited to the contents set forth in the detailed description of the specification but is intended to be limited by the appended claims.

Claims

1. Backlight unit, comprising: a light guiding layer including an incident surface on which light is incident and an exit surface from which light is emitted; a light source disposed on the incident surface of the light guiding layer and configured to generate the light; a low refractive layer disposed on the exit surface of the light guiding layer; A color control layer, which is disposed on the low refractive layer; as well as a protective layer disposed on the color control layer, wherein the protective layer comprises a resin composition comprising the first repeating unit and further comprising at least one of the second repeating unit and the third repeating unit, The first repeating unit is represented by the following formula 1, the second repeating unit is represented by the following formula 2, and the third repeating unit is represented by the following formula 3: [Formula 1] In Formula 1, R1 and R2 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, a substituted or unsubstituted acrylic group, a substituted or unsubstituted methacrylic group, a substituted or unsubstituted isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted a cycloalkyl group having 3 to 12 ring carbon atoms, a substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, and -* represents a position to be attached, [Formula 2] [Formula 3] In formula 3, X is OR 12 or O(SiO 3 / 2 R 13 ) 4+2n , and n is an integer of 0 or greater, In Formula 2 and Formula 3, R3 to R 13 The substituted or unsubstituted alkyl groups are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted epoxy group, a substituted or unsubstituted mercapto group, an acrylic group, a methacrylic group, an isocyanate group, a nitrile group, a nitro group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 40 carbon atoms, a substituted or unsubstituted cycloalkane group having 3 to 12 ring carbon atoms, a substituted or unsubstituted heterocycloalkyl group having 2 to 12 ring carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 12 ring carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 12 ring carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 12 ring carbon atoms, and -* represents a position to be attached, The term "substituted" refers to being replaced by one or more than one selected from the group consisting of a deuterium atom, a halogen atom, a cyano group, a nitro group, an amine group, a silyl group, a phosphine oxide group, a phosphine sulfide group, a C 1-10 Alkyl group, C 2-10 Alkenyl group, C 6-15 Aryl groups and C 2-12 The substituents in the group consisting of the heterocyclic group are substituted. 2 . The backlight unit of claim 1 , wherein the protective layer further comprises silicon dioxide particles. 3 . The backlight unit of claim 1 , wherein the protection layer is disposed in an outermost area of ​​the backlight unit. The backlight unit of claim 1 , wherein the color control layer comprises at least one quantum dot. 5 . The backlight unit of claim 1 , wherein the low-refractive layer has a refractive index of 1.2 to 1.4, and comprises hollow silica. The backlight unit of claim 1 , wherein the low-refractive layer is directly disposed on the light guiding layer. 7 . The backlight unit of claim 1 , further comprising at least one barrier layer including at least one inorganic film and disposed adjacent to at least one surface of the color control layer. 8 . The backlight unit of claim 1 , further comprising barrier layers disposed between the color control layer and the low refractive layer and between the color control layer and the protective layer, respectively.

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