KR101966672B1 - Wavelength converting member and display device including the same - Google Patents

Abstract

A wavelength conversion member is provided. The wavelength conversion member includes a wavelength conversion layer, a first barrier layer disposed on one surface of the wavelength conversion layer, a second barrier layer disposed on the other surface of the wavelength conversion layer, a first diffusion layer disposed on the second barrier layer, A first bonding layer disposed on the diffusion layer, and a first prism sheet disposed on the first bonding layer, wherein the first diffusion layer includes surface irregularities, and a part of the first diffusion layer penetrates into the first bonding layer And an air gap is defined between the first diffusion layer and the first coupling layer.

Description

[0001] The present invention relates to a wavelength converting member and a display device including the wavelength converting member.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength converting member and a display device including the wavelength converting member, and more particularly, to a wavelength converting member applied to a backlight unit or the like of a liquid crystal display device and a display device including the wavelength converting member.

A liquid crystal display (LCD) is a device for displaying an image by injecting liquid crystal between two glass plates and applying power to the upper and lower glass plate electrodes to change the arrangement of liquid crystal molecules in each pixel. Unlike a cathode ray tube (CRT), a plasma display panel (PDP) or the like, a display using a liquid crystal display device is not usable in a place where there is no light because the display itself is non-luminous. In order to compensate for these drawbacks, a backlight assembly that is uniformly irradiated on the information display surface is mounted for the purpose of enabling use in a dark place.

In the liquid crystal display panel, the transmittance differs according to the alignment direction of the liquid crystal. Since the direction of the liquid crystal passing through the light coming from the front and the light coming out from the side are different, a difference in color coordinates occurs between the front and the side.

In addition, a liquid crystal display panel usually uses a light source that provides white light, and transmits only a desired color using a color filter to display a color. However, when the spectrum of the white light provided by the light source is not sharp, the wavelength transmitted through the color filter is not clearly distinguished, and color reproducibility may be poor.

In order to improve the color reproducibility as described above, attempts have been made to realize a sharp spectrum by converting light of a specific wavelength using a wavelength conversion material such as a quantum dot. However, if a separate wavelength conversion film is used, the number of films in the backlight increases, which is disadvantageous for handling. In addition, in the case of using a wavelength conversion film, a luminance lowering occurs. In order to compensate for this, at least one brightness enhancement sheet such as a reflective polarizing film may be used. In this case, a moire phenomenon may occur in relation to other optical sheets.

A problem to be solved by the present invention is to provide a multifunctional wavelength conversion member exhibiting a high color reproducibility and a high luminance.

Another object of the present invention is to provide a display device having excellent color reproduction rate and high luminance.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a wavelength conversion element comprising a wavelength conversion layer, a first barrier layer disposed on one surface of the wavelength conversion layer, a second barrier layer disposed on the other surface of the wavelength conversion layer, A first diffusion layer disposed on the first barrier layer, a first diffusion layer disposed on the second barrier layer, a first coupling layer disposed on the first diffusion layer, and a first prism sheet disposed on the first coupling layer, Wherein a part of the first diffusion layer is penetrated into the first bonding layer, and an air gap is defined between the first diffusion layer and the first bonding layer.

According to another aspect of the present invention, there is provided a display device including a light source, a wavelength conversion member disposed on the optical path of the light source, and a display panel disposed on the wavelength conversion member. do.

The details of other embodiments are included in the detailed description and drawings.

According to the wavelength converting member and the display device according to the embodiments of the present invention, not only wavelength conversion but also diffusion and condensing functions can be performed by one integrated member. That is, by composing various optical functional layers, various optical characteristics are realized, mechanical strength is improved, handling is simplified, and degradation of wavelength conversion particles can be prevented more effectively. Furthermore, the moiré phenomenon can be prevented while exhibiting a high luminance.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a schematic cross-sectional view of a wavelength conversion member according to an embodiment of the present invention.
Figures 2 and 3 are cross-sectional views of a barrier film according to various embodiments of the present invention.
4 is a cross-sectional view of a wavelength conversion layer according to another embodiment of the present invention.
5 is a cross-sectional view of a wavelength conversion member according to another embodiment of the present invention.
6 is a cross-sectional view of a wavelength conversion member according to another embodiment of the present invention.
7 is a cross-sectional view of a display device according to an embodiment of the present invention.
8 is a cross-sectional view of a display device according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that elements or layers are referred to as being "on " other elements or layers, including both intervening layers or other elements directly on or in between. On the other hand, a device being referred to as "directly on" refers to not intervening another device or layer in the middle. Like reference numerals refer to like elements throughout the specification. "And / or" include each and any combination of one or more of the mentioned items.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

As used herein, the terms "to sheet "," to film ", "to plate ", and the like may be used interchangeably. In addition, the optical member, which is a term in this specification, can be used to mean an optical sheet, an optical film, an optical plate, an optical film package and the like.

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

1 is a schematic cross-sectional view of a wavelength conversion member according to an embodiment of the present invention.

1, a wavelength conversion member 1 according to an embodiment of the present invention includes a wavelength conversion layer 10, a first barrier layer 21 disposed on one surface of the wavelength conversion layer 10, A second barrier layer 22 disposed on the other side of the layer 10, a first diffusion layer 40 disposed on the second barrier layer 22, a first bonding layer 40 disposed on the first diffusion layer 40, And a first prism sheet 60 disposed on the first bonding layer.

The wavelength conversion layer 10 converts at least a part of the incident light wavelength. The wavelength conversion layer 10 includes the binder layer 110 and the wavelength conversion particles 121 and 122 dispersed in the binder layer 110. The wavelength conversion layer 10 may further include scattering particles 130 dispersed in the binder layer 110 in addition to the wavelength conversion particles.

The binder layer 110 is a medium in which particles are dispersed, and may be composed of various resin compositions, which may be generally referred to as binders. However, the present invention is not limited thereto. In the present specification, a medium capable of dispersing and arranging the wavelength conversion particles 121 and 122 and / or scattering particles 130 may be a binder layer 110 < / RTI >

The wavelength conversion particles 121 and 122 are particles that convert the wavelength of incident light, and may be, for example, a quantum dot (QD), a fluorescent material, or a phosphorescent material. The quantum dots, which are an example of the wavelength conversion particles 121 and 122, are described in detail. The quantum dots are materials having a crystal structure of several nanometers in size, and are composed of several hundreds to thousands of atoms. Since quantum dots are very small, quantum confinement effects appear. The quantum confinement effect refers to a phenomenon in which an energy band gap of an object becomes larger when the object becomes smaller than a nano-size. Accordingly, when light having a wavelength higher than the band gap is incident on the quantum dot, the quantum dot is excited by absorbing the light, and falls to a ground state while emitting light of a specific wavelength. The light of the emitted wavelength has a value corresponding to the band gap. Quantum dots can control the luminescence characteristics of the quantum confinement effect by adjusting the size and composition thereof.

The quantum dot applicable to the present embodiment is not particularly limited as long as it is ordinarily used, and examples thereof include a-VI compound, -V compound, -VI compound, -V compound, -V group compound, Group compound, -IV-group compound, and-IV-group compound.

The quantum dot may comprise a core and a shell overcoating the core. The core may be, for example, CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InP, InAs, InSb, SiC, At least one of Se, In, P, Fe, Pt, Ni, Co, Al, Ag, Au, Cu, FePt, Fe2O3, Fe3O4, Si and Ge. The shell may be made of any material including, but not limited to, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe and PbTe.

The wavelength converting particles 121 and 122 may include a plurality of wavelength converting particles that convert incident light to different wavelengths. For example, the wavelength conversion particle may include a first wavelength conversion particle 121 that converts incident light of a specific wavelength to a first wavelength and emits the same, and a second wavelength conversion particle 122 that converts the second wavelength conversion particle to a second wavelength and emits the converted wavelength. have. In an exemplary embodiment, the incident light may be blue light, the first wavelength may be a green wavelength, and the second wavelength may be a red wavelength. For example, the blue wavelength may be a wavelength having a peak at 420 to 470 nm, the green wavelength may be a wavelength having a peak at 520 nm to 570 nm, and the red wavelength may be a wavelength having a peak at 620 nm to 670 nm. However, it should be understood that the blue, green, and red wavelengths are not limited to the above examples and include all wavelength ranges that can be recognized as blue, green, and red in the art.

In the above exemplary embodiment, the blue light incident on the wavelength conversion layer 10 passes through the wavelength conversion layer 10 and partly enters the first wavelength conversion particle 121, is converted into a green wavelength and emitted, A part thereof enters the second wavelength conversion particle 122 and is converted into a red wavelength and emitted, and the remaining part can be emitted without being incident on the first and second wavelength conversion particles 121 and 122. Therefore, the light that has passed through the wavelength conversion layer 10 includes both the blue wavelength light, the green wavelength light, and the red wavelength light. If the ratio of the emitted light of different wavelengths is appropriately adjusted, the outgoing light of white light or other color can be displayed. The converted lights in the wavelength conversion layer 10 are concentrated within a narrow range of specific wavelengths and have a sharp spectrum with a narrow half width. Therefore, when color of such spectrum light is filtered by a color filter, the color reproducibility can be improved.

The ratio of the emitted light can be controlled by the content of the first wavelength conversion particles 121 and the content ratio of the second wavelength conversion particles 122. For example, when the content of the first wavelength conversion particles 121 is relatively large, light of the first wavelength is emitted more and when the content of the second wavelength conversion particles 122 is relatively large, A lot is emitted. In an exemplary embodiment, the content ratio of the first wavelength conversion particles 121 related to the green wavelength and the second wavelength conversion particles 122 related to the red wavelength may be 5: 1 to 14: 1, and further, 8: 1 To 12: 1. ≪ / RTI >

Unlike the above exemplary embodiment, three kinds of wavelength converting particles for converting incident light into ultraviolet light and converting them into blue, green, and red wavelengths may be disposed in the wavelength conversion layer 10 to emit white light.

The wavelength conversion layer 10 may further include scattering particles 130. The scattering particles 130 may be non-quantum particles having no wavelength conversion function. Scattering particles 130 scatter incident light so that more incident light can be incident on the wavelength conversion particle. In addition, the scattering particles 130 can play a role of uniformly controlling the emission angle of each wavelength. Specifically, when a part of the incident light is incident on the wavelength converting particle and then the wavelength is converted and emitted, the emitting direction has a random scattering characteristic. If the scattering particles 130 are not present in the wavelength conversion layer 10, the green and red wavelengths emitted after the collision of the wavelength conversion particles 121 and 122 have scattering emission characteristics. However, Does not have a scattering emission characteristic, and the emission amount of the blue / green / red wavelength will be different depending on the emission angle. Scattering particles 130 can scatter scattering emission characteristics even for blue wavelengths emitted without colliding with the wavelength conversion particles 121 and 122, thereby making it possible to similarly control the emission angle of light for respective wavelengths.

It is preferable that the content of the scattering particles 130 is equal to or greater than the content (sum) of the first and second wavelength conversion particles 121 and 122 in order to effectively exhibit the wavelength conversion efficiency and the scattering emission characteristic. However, if the content of the scattering particles 130 is too large, the transmittance of the wavelength conversion layer 10 can be lowered. For example, when the content of the scattering particles 130 exceeds 6 times the content of the first and second wavelength conversion particles 121 and 122, the incident blue wavelength light is excessively scattered and the blue wavelength transmittance And a relatively strong green and red wavelength light is emitted, making it inappropriate to apply it as a backlight unit. In view of this, the content of the scattering particles 130 is preferably in the range of not less than 6 times the content of the first and second wavelength conversion particles 121 and 122, not more than the content of the first and second wavelength conversion particles 121 and 122 Lt; / RTI >

The scattering particles 130 may be larger in size than the wavelength converting particles 121 and 122. For example, the scattering particles 130 may have a size of 4 to 20 times larger than the wavelength converting particles 121 and 122. The scattering particles 130 may be SiO2, TiO2, or the like. SiO2 may have a size of 0.1 mu m to 20 mu m, and in one embodiment, SiO2 having a size of 1.5 mu m to 3.5 mu m may be used. TiO2 may have a size of 0.05 to 5 mu m, and in one embodiment, 0.19 to 0.48 mu m of TiO2 may be used.

The first barrier layer 21 is disposed on one surface (lower portion in the drawing) corresponding to the incident side of the wavelength conversion layer 10 and the other surface (upper portion in the drawing) corresponding to the emission side of the wavelength conversion layer 10, A second barrier layer 22 is disposed. The first barrier layer 21 and the second barrier layer 22 are formed to have a low water permeation rate (WVTR (g / m ² / day)) so as to prevent moisture from penetrating into the wavelength conversion layer 10 Lt; / RTI > For example, the barrier layers 21 and 22 may have a moisture permeability (measured, for example, at a temperature of 38 and 90% relative humidity conditions by the ASTM F 1249 method) of 10 ^-1 to 10 ^-4 g / m ² / day. < / RTI >

The first barrier layer 21 and the second barrier layer 22 may each comprise at least one barrier film. The specific structure of the barrier film will be described later.

In this embodiment, since the first barrier layer 21 and the second barrier layer 22 are symmetrically arranged on one surface and the other surface of the wavelength conversion layer 10, the stress in the vertical direction is canceled, .

A first diffusion layer (40) is disposed on the second barrier layer (22). The first diffusion layer 40 disperses light incident from the bottom surface evenly over the surface and functions to raise light incident at an oblique angle in a direction perpendicular to the screen, thereby increasing the brightness. In addition, the haze value of the first diffusion layer 40 is a factor for determining the luminance, and the color reproduction rate can also have some influence, for example, a synergistic effect depending on the haze value. The optical characteristics were evaluated in order to confirm the effect of the haze value of the first diffusion layer 40 on the luminance and the color recall ratio. The first diffusing layer 40 having the structure shown in FIG. 1 and various samples having different haze values and a sample having no first diffusing layer 40 as a comparative example are manufactured, and then the brightness and color reproduction ratio are measured Respectively. The results are shown in Tables 1 and 2 below. Table 1 shows the results of using SiO2 as scattering particles, and Table 2 shows the use of TiO2 as scattering particles.

Haze value Scattering particles Brightness (nit) Color recall Luminance increase / decrease ratio Color recall rate increase / decrease rate 0% SiO2 429.4 103.5% 10% SiO2 427.9 103.6% 99.7% 100.1% 20% SiO2 428.7 103.6% 99.8% 100.1% 30% SiO2 427.9 103.8% 99.7% 100.3% 40% SiO2 427.2 103.7% 99.5% 100.2% 45% SiO2 428.7 103.8% 99.8% 100.3% 50% SiO2 429.4 103.7% 100.0% 100.2% 55% SiO2 427.9 103.9% 99.7% 100.4% 60% SiO2 428.7 103.8% 99.8% 100.3% 65% SiO2 427.9 103.9% 99.7% 100.4% 70% SiO2 433.1 104.0% 100.9% 100.5% 75% SiO2 435.3 104.5% 101.4% 100.9% 80% SiO2 445.7 104.3% 103.8% 100.8% 85% SiO2 452.4 104.6% 105.3% 101.0% 90% SiO2 469.4 104.9% 109.3% 101.3% 95% SiO2 476.0 105.1% 110.9% 101.5% 97% SiO2 473.1 105.2% 110.2% 101.6%

Haze value Scattering particles Brightness (nit) Color recall Luminance increase / decrease ratio Color recall rate increase / decrease rate 0% TiO2 423.6 103.5% 10% TiO2 423.5 103.4% 100.0% 99.9% 20% TiO2 423.6 103.4% 100.0% 99.9% 30% TiO2 422.9 103.5% 99.8% 100.0% 40% TiO2 423.6 103.5% 100.0% 100.0% 45% TiO2 424.1 103.5% 100.1% 100.0% 50% TiO2 423.8 103.5% 100.0% 100.0% 55% TiO2 423.6 103.5% 100.0% 100.0% 60% TiO2 422.7 103.4% 99.8% 99.9% 65% TiO2 423.4 103.4% 100.0% 99.9% 70% TiO2 423.6 103.5% 100.0% 100.0% 75% TiO2 423.8 103.5% 100.0% 100.0% 80% TiO2 425.2 103.5% 100.4% 100.0% 85% TiO2 432.2 103.5% 102.0% 100.0% 90% TiO2 432.8 103.7% 102.2% 100.2% 95% TiO2 432.8 103.7% 102.2% 100.2% 97% TiO2 432.8 103.7% 102.2% 100.2%

Referring to Tables 1 and 2, when the haze is lower than 70%, the luminance shows a negative increase rate. However, when the haze is higher than 70%, it is confirmed that not only the luminance but also the color reproduction rate are significantly increased. In addition, in the case of using TiO2 as the scattering particles, the basic color recall ratio is higher than that in the case of using SiO2, but the increase in luminance due to the increase in haze is insignificant. On the other hand, in the case of using SiO2, it was confirmed that the basic luminance was higher than TiO2 and the luminance and color recall ratio were more improved with increasing haze.

From the above experimental results, the first diffusion layer 40 preferably has a haze of 70% or more, more preferably 90% or more.

The first diffusion layer 40 may include a plurality of recesses and recesses. As another example, the first diffusion layer 40 may comprise a resin layer and organic beads or inorganic beads dispersed therein. In addition, the first diffusion layer 40 may have irregularities on its surface while including beads. The haze of the first diffusion layer 40 can be controlled by the density of the irregularities, the refractive index or distribution ratio of the beads, and the like. Alternatively, the first diffusion layer 40 of various shapes and arrangements having a haze of 70% or more can be applied.

The first diffusion layer 40 may be formed directly on the upper surface of the second barrier layer 22.

The back coat layer 50 may be disposed under the first barrier layer 21. The back coating layer 50 may be formed by curing a resin layer including a plurality of beads. As another example, the back coating layer 50 may be formed in an emboss pattern having a predetermined surface roughness. It is preferable that the back coating layer 50 has a haze value that does not cause a substantial decrease in light transmittance. The haze value of the back coating layer 50 is preferably smaller than the haze value of the first diffusion layer 40. For example, the back coating layer 50 may have a haze value of 3 to 10%.

The first bonding layer 31 and the first prism sheet 60 are sequentially disposed on the first diffusion layer 40. The first prism sheet 60 is combined with the lower first diffusion layer 40 through the first bonding layer 31 to be integrated as a whole.

The first prism sheet 60 includes a first substrate 61 and a first prism pattern layer 62 disposed on the first substrate 61. The prism pattern of the first prism pattern layer 62 extends in one direction. The first prism sheet 60 serves to condense the incident light. In place of the first prism sheet 60, an optical sheet including another light collecting pattern such as a lenticular sheet, a microlens, a pyramid pattern sheet, or the like may be applied, unlike the illustrated example.

The first bonding layer 31 is disposed on the lower surface of the first base 61 and the surface irregularities of the first diffusion layer 40 partially penetrate into the first bonding layer 31 and are bonded. An air gap is defined between the first bonding layer 31 and the first diffusion layer 40. The light passing through the wavelength conversion member 1 may be refracted and scattered by the difference between the refractive index of the first diffusion layer 40 and the air filling the air gap and the refractive index.

The first bonding layer 31 may be composed of a bonding material layer, for example, an adhesive layer, an adhesive layer, or a resin layer. Examples of the material constituting the adhesive layer include a silicone polymer, a urethane polymer, a silicone-urethane hybrid structure, an SU polymer, an acrylic polymer, an isocyanate polymer, a polyvinyl alcohol polymer, a gelatin polymer, a vinyl polymer, a latex polymer, A high-transparency adhesive containing a high molecular substance classified into < RTI ID = 0.0 > An example of the resin layer is a polymer resin including an ultraviolet curable resin or a thermosetting resin. Specifically, it may be composed of an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and a derivative thereof, an unsaturated dibasic acid and a derivative thereof, and a vinylcyanide compound such as methacrylonitrile.

In the case of this embodiment, since the wavelength conversion layer 10 converts the wavelength of light into a specific wavelength, the color reproducibility can be improved. Since the upper and lower portions of the wavelength conversion layer 10 are protected by the first and second barrier layers 21 and 22, degradation due to inflow of moisture can be prevented. Further, since the first diffusion layer 40, the first bonding layer 31, the first prism sheet 60, and the like are integrally laminated on the second barrier layer 22, moisture can be further prevented from flowing.

In addition, the light passing through the wavelength conversion layer 10 can be uniformly diffused through the first diffusion layer 40, refracted upward through the first prism sheet 60, and condensed. In particular, since the first diffusion layer 40 and the first prism sheet 60 are integrated and disposed closely, it is possible to minimize the loss of light diffused by the first diffusion layer 40 to the outside. Therefore, the overall luminance can be further improved.

In addition, the wavelength conversion layer 10, the first diffusion layer 40, and the first prism sheet 60 are combined and integrated to realize various optical characteristics with a single member, and excellent mechanical strength, .

Hereinafter, the specific structure of the barrier film that can be applied to the first and second barrier layers 21 and 22 will be described in more detail. Figures 2 and 3 are cross-sectional views of a barrier film according to various embodiments of the present invention. 2 illustrates a case in which the metal oxide layer 231 is formed on only one surface of the transparent substrate 210. FIG. In FIG. 2, a metal oxide layer 231 is formed on the lower surface of the transparent substrate 210, but a metal oxide layer may be formed on the upper surface of the transparent substrate 210. 3 illustrates a case where the metal oxide layers 231 and 232 are formed on one surface and the other surface of the transparent substrate 210, respectively.

The barrier films 201 and 202 described in FIGS. 2 and 3 may be applied to the first and second barrier layers 21 and 22, respectively, of FIG. The first and second barrier layers 21 and 22 may both include the barrier film 201 of FIG. 2 or may comprise both the barrier film 202 of FIG. 3, but the first and second barrier layers 21 and 22 may include the barrier film 201 of FIG. 2, and the other may include the barrier film 202 of FIG.

The barrier film 201 exemplarily shown in FIG. 2 includes a transparent substrate 210 and a first anchor primer layer 221 formed on one surface of the transparent substrate 210, a first anchor primer layer 221 formed on the first anchor primer layer 221, 1 metal oxide layer 231 and a first top primer layer 241 formed on the first metal oxide layer 231.

The barrier film 202 exemplarily shown in FIG. 3 includes a first anchor primer layer 221, a first metal oxide layer 231, and a first top primer layer 241 A second metal oxide layer 232 and a second top primer layer 242 which are sequentially stacked on the other surface of the transparent substrate 210. The second anchor primer layer 222, Since the barrier film 202 of FIG. 3 has the metal oxide layers 231 and 232 on both sides of the transparent substrate 210, it is possible to reduce the moisture permeability even when the thickness of the metal oxide layer is made thinner than that of the barrier film 201 of FIG. Can be significantly lowered. Therefore, the manufacturing cost can be reduced.

2 and 3, the transparent substrate 210 may be one that is conventionally applied to an optical film. For example, the transparent substrate 210 may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polysulfone (PSF), polymethylmethacrylate And may include at least one of acetylcellulose (TAC), cycloolefin polymer (COP), and cycloolefin copolymer (COC).

The first and second anchor primer layers 221 and 222 increase the bonding force between the transparent substrate 210 and the metal oxide layers 231 and 232. The first and second anchor primer layers 221 and 222 generally include a primer layer coated on the transparent substrate 210 as well as a material such as an adhesive and an adhesive. The first and second anchor primer layers 221 and 222 may be omitted. In this case, the first and second metal oxide layers 231 and 232 may be formed directly on the surface of the transparent substrate 210 by a method such as vapor deposition or coating, or the transparent substrate 210 may be directly formed .

The first and second metal oxide layers 231 and 232 may comprise SiO2, Al2O3, or ZnO. The first and second metal oxide layers 231 and 232 give the barrier films 201 and 202 a function of preventing water permeation. The moisture permeability of the barrier films 201 and 202 may vary depending on the constituent materials and thicknesses of the first and second metal oxide layers 231 and 232. The thickness of the first and second metal oxide layers 231 and 232 may be 200 nm or less, preferably 10 to 100 nm.

The first and second top primer layers 241 and 242 are formed on the first and second metal oxide layers 231 and 232 to form other structures such as the wavelength conversion layer 10, (40), the back coating layer (50), and the like. The first and second top primer layers 241 and 242 include materials such as an adhesive, an adhesive, and the like, as well as a primer layer generally used. The first and second top primer layers 241 and 242 may be omitted when the adjacent structures are made of an adhesive or the like and already have a predetermined bonding force.

4 is a cross-sectional view of a wavelength conversion layer according to another embodiment of the present invention.

4, the wavelength conversion layer 11 according to the present embodiment differs from the wavelength conversion layer 11 of FIG. 1 in that the binder layer includes the first binder pattern layer 111 and the second binder pattern layer 112 10).

The pattern surfaces of the first binder pattern layer 111 and the second binder pattern layer 112 have a complementary shape in which they face each other and engage with each other. For example, the first binder pattern layer 111 may have a prism shape and the second binder pattern layer 112 may have a reverse prism shape complementary to the first binder pattern layer 111. Although not shown in the drawings, the pattern surface of the first binder pattern layer 111 may be a lenticular shape having a cross section of a part of a circle or a part of an ellipse, or may be deformed into various other shapes. In this case, the pattern surface of the second binder pattern layer 112 has a shape complementary thereto as described above.

On the other hand, the opposite surfaces of the first binder pattern layer 111 and the second binder pattern layer 112 are flat and parallel to each other. In this case, the thickness of the first binder pattern layer 111 and the second binder pattern layer 112 in the laminated state can be uniform. When the first binder pattern layer 111 is formed using the established prism or lenticular manufacturing process and the complementary second binder pattern layer 112 is formed thereon using a coating or the like, the entire thickness of the binder layer can be easily uniformized Can be controlled. The uniformity of the entire thickness of the binder layer can improve the light quality.

More detailed contents of the structure, numerical value, manufacturing method and the like of the first binder pattern layer 111 and the second binder pattern layer 112 are disclosed in Korean Patent Laid-Open Publication No. 2016-0031616, Are incorporated and incorporated as fully disclosed in the specification.

The first and second wavelength conversion particles 121 and 122 and the scattering particles 130 may be dispersedly disposed in the first binder pattern layer 111 and the second binder pattern layer 112 by various methods.

For example, the first and second wavelength conversion particles 121 and 122 and the scattering particles 130 may be uniformly dispersed in the first binder pattern layer 111 and the second binder pattern layer 112, respectively .

As another example, the first and second wavelength conversion particles 121 and 122 and the scattering particles 130 are dispersedly disposed in only one of the first binder pattern layer 111 and the second binder pattern layer 112, But may not be disposed on the other of the binder pattern layer 111 and the second binder pattern layer 112.

In another example, the first wavelength conversion particles 121 are dispersed and disposed only in one of the first binder pattern layer 111 and the second binder pattern layer 112, and the second wavelength conversion particles 122 are dispersed in the first binder pattern layer 111 and the second binder pattern layer 112, And may be dispersedly disposed only on the other of the pattern layer 111 and the second binder pattern layer 112. [ In this case, the scattering particles 130 may be dispersed only in the first binder pattern layer 111, dispersed only in the second binder pattern layer 112, or dispersed in the first binder pattern layer 111 and the second binder pattern layer 112).

As another example, the first wavelength conversion particles 121 and the second wavelength conversion particles 122 may be dispersed and disposed only in one of the first binder pattern layer 111 and the second binder pattern layer 112, 130 may be dispersedly disposed only on the other of the first binder pattern layer 111 and the second binder pattern layer 112.

5 is a cross-sectional view of a wavelength conversion member according to another embodiment of the present invention.

5, the wavelength converting member 2 according to the present embodiment has a structure in which the second bonding layer 32 and the reflective polarizing film 80 are sequentially laminated on the first prism sheet 60, It is different from the example.

The reflective polarizing film 80 is combined with the lower first prism sheet 60 through the second bonding layer 32 to be integrated as a whole. Concrete contents of the reflective polarizing film 80 will be described later.

The second bonding layer 32 is disposed on the lower surface of the reflective polarizing film 80 and the surface irregularities of the first prism pattern layer 62 partially penetrate into the second bonding layer 32 and are bonded. An air gap is defined between the second bonding layer 32 and the first prism pattern layer 62. The light passing through the wavelength conversion member 1 can be refracted and condensed by the refractive index difference between the air and the air filling the refractive index and the air gap of the first prism pattern layer 62.

The second bonding layer 32, like the first bonding layer 31 described above, may be formed of a bonding material layer, for example, an adhesive layer, an adhesive layer, or a resin layer.

A second diffusion layer 90 is disposed on the reflective polarizing film 80. The second diffusion layer 90 may be formed by coating directly on the upper surface of the reflective polarizing film 80. The second diffusion layer 90 may perform substantially the same function as the first diffusion layer 40. The second diffusion layer 90 preferably has a haze of 70% or more, more preferably 90% or more. The haze value of the second diffusion layer 90 may vary depending on the angle formed by the polarization axis (transmission axis) of the reflective polarizing film 80 and the extending direction of the first prism pattern layer 62. A detailed description thereof will be given later.

The reflective polarizing film 80 is a film that transmits specific polarized light and reflects other specified polarized light, and its transmittance may be 40 to 60% over the entire visible light wavelength range of 380 nm to 780 nm. The reflective polarizing film 80 does not pass through the polarizing plate of the liquid crystal display panel but reflects the polarized light to be absorbed and recycles it, thereby improving the light efficiency.

The reflective polarizing film 80 may be a multilayered reflective polarizing film 80 or a stretched reflective polarizing film 80 in which a high refractive index layer and a low refractive index layer are alternately laminated. The reflective polarizing film 80 may be a polymer dispersion type having a plurality of second polymers having different refractive indexes in the first polymer layer or a polymer type reflective polarizing film 80 having fibers instead of the second polymer, And may be a wire grid type reflective polarizing film 80 having a fine nano pattern.

Taking the reflective polarizing film 80 as a multilayered reflective polarizing film as an example, the reflective polarizing film 80 includes a plurality of alternately stacked first refraction layers 23a and second refraction layers 23b . The first refraction layer 23a may be a PEN layer and the second refraction layer 23b may be a COPEN layer. The number of times of lamination of the first refraction layer 23a and the second refraction layer 23b in the reflective polarizing film 80 may be several tens to several hundreds or more.

The refractive indexes of the first refractive layer 23a and the second refractive layer 23b may be different from each other in the direction of the reflective axis and the refractive index may be the same in the direction of the polarization axis (transmission axis) perpendicular to the reflective axis. The linearly polarized light oscillating in the direction of the polarization axis transmits the reflective polarizing film 80 because the refractive indexes of the first refraction layer 23a and the second refraction layer 23b in the direction of the polarization axis are substantially the same. On the other hand, since the refractive indexes of the first refractive layer 23a and the second refractive layer 23b in the reflective axial direction are different from each other, the light oscillating in the direction is transmitted through the first refractive layer 23a and the second refractive layer 23b, Lt; / RTI >

The reflection efficiency at the interface between the first refraction layer 23a and the second refraction layer 23b is correlated with the wavelength and the thickness of the first refraction layer 23a and the thickness of the second refraction layer 23b. There is a thickness of each layer having the maximum reflection efficiency for the wavelength. The longer the wavelength, the greater the thickness of each layer exhibiting the maximum reflection efficiency. Therefore, the reflective polarizer film 80 has the first refractive layer 23a and the second refractive layer 23b of various thicknesses in order to have an excellent reflection efficiency in the entire wavelength range of visible light. For example, the reflective polarizing film 80 includes a first refraction layer 23a and a second refraction layer 23b of a first thickness having a maximum reflection efficiency at a blue wavelength, a first refraction layer 23a and a second refraction layer 23b having a maximum reflection efficiency at a green wavelength, A first refraction layer 23a and a second refraction layer 23b having a second thickness larger than the thickness and a first refraction layer 23a having a third thickness larger than the second thickness having a maximum reflection efficiency at a red wavelength, And two refraction layers 23b.

6 is a cross-sectional view of a wavelength conversion member according to another embodiment of the present invention. 6 differs from the embodiment of FIG. 5 in that it further includes a second prism sheet 70 integrated between the first diffusion layer 40 and the first prism sheet 60. The wavelength conversion member 3 shown in FIG.

More specifically, the third bonding layer 33 and the second prism sheet 70 are sequentially disposed on the first diffusion layer 40. The second prism sheet 70 includes a second base material 71 and a second prism pattern layer 72 disposed on the second base material 71. The prism pattern of the first prism pattern layer 62 and the prism pattern of the second prism pattern layer 72 may extend in one direction. Although the elongation direction of the first prism pattern layer 62 and the elongation direction of the second prism pattern layer 72 are perpendicular to each other in the drawing, the elongation directions may be the same, have.

The second prism sheet 70 is bonded to the lower first diffusion layer 40 through the third bonding layer 33. The third bonding layer 33 is disposed on the lower surface of the second substrate 71. The convex portion of the first diffusion layer 40 partially penetrates into the third bonding layer 33, 33) surface so that an air gap can be defined therebetween.

The third bonding layer 33, like the first and second bonding layers 31 and 32 described above, may be formed of a bonding material layer, for example, an adhesive layer, an adhesive layer, or a resin layer. In addition, the fact that the first bonding layer 31 and the second bonding layer 32 and / or the third bonding layer 33 may further include a dye or pigment in order to prevent a change in color coordinate may be substantially .

The second prism sheet 70 engages with the upper first prism sheet 70 through the first bonding layer 31. The first bonding layer 31 is disposed on the lower surface of the first base 61 and the peaks of the second prism pattern layer 72 partially penetrate and bond to the first bonding layer 31. An air gap is defined between the second prism pattern layer 72 and the first bonding layer 31.

(Tilt angle) between the transmission axis of the reflective polarizing film 80 and the extending direction of the first prism pattern layer 62 adjacently connected to the transmission axis of the reflective polarizing film 80 and the angle The haze value is a factor that directly affects the manufacturing cost, the viewing angle, the luminance and the moire.

Specifically, the angle (tilt angle) formed by the transmission axis of the reflective polarizing film 80 and the extending direction of the first prism pattern layer 62 is in a range of 0 ° to ± RTI ID = 0.0 > 45. ≪ / RTI > The tilt angle can be selected in consideration of the production speed and the manufacturing cost. For example, when the tilt angle is about 0 °, the soft mold can be applied when the first prism pattern layer 62 is formed, thereby reducing manufacturing cost. On the other hand, when the tilting angle is set to 45 °, the production speed and luminance are slightly increased, but the manufacturing cost can be increased because a hard mold is applied. In addition, if the tilt angle is set to 45 degrees, the viewing angle can be narrowed.

Therefore, it is preferable that the transmission axis of the reflective polarizing film 80 and the extending direction of the first prism pattern layer 62 are the same or similar when the production speed, the manufacturing cost, the luminance, the viewing angle and the like are taken into consideration comprehensively. That is, in view of manufacturing variations in the process, the tilt angle may be in the range of 0 ° to ± 3 °. When the tilt angle is within 3 [deg.], The optical characteristic difference may hardly occur when compared with the case of 0 [deg.].

On the other hand, the present inventors have repeatedly found that when the transmission axis of the reflective polarizing film 80 and the extending direction of the first prism pattern layer 62 are substantially the same, that is, when the tilt angle is in the range of 0 to 3 It was confirmed that it had excellent viewing angle characteristics. However, if the tilt angle is in the range of 0 占 to 占 占, the probability of occurrence of the moire phenomenon increases. In order to prevent such a moire phenomenon, it is preferable that the second diffusion layer 90 disposed on the upper surface of the reflective polarizing film 80 has a high haze value. However, if the haze value is excessively high, have. Therefore, it is important that the second diffusion layer 90 has a proper haze value in order to minimize the luminance drop while preventing the moire phenomenon when the tilt angle is in the range of 0 [deg.] To 3 [deg.].

The effect on the moire and the viewing angle is compared with the case where the angle formed by the transmission axis of the reflective polarizing film 80 and the extending direction of the first prism pattern layer 62 is 45 deg. Corresponding to 0 deg. And the haze value of the second diffusion layer 90 formed to compensate for this influence on the moire, the viewing angle and the luminance.

6, while the second diffusion layer 90 is manufactured so that various samples having different haze values have 0 ° and 45 ° tilt angles, and then the moire occurrence, viewing angle, and luminance according to the tilt angle are measured Respectively. The results are shown in Tables 3, 4 and 5, respectively. The degree of moire in Table 3 was expressed as a result of the sensory evaluation of the present inventors according to the haze value.

Moire Hayes Tilt angle 0% 50% 55% 60% 65% 70% 75% 80% 85% 90% 45 ° tilt River medium about weak weak weak weak X X X 0 ° tilt River River medium medium about weak weak weak weak X

Viewing angle Hayes Viewing Angle (Unit: °) 70% 75% 80% 85% 90% 95% 98% 1/2 angle 45 ° tilt 27.4 28.6 29.5 30.6 31.5 32.1 32.4 0 ° tilt 35.5 36.6 37.8 38.4 39.3 39.8 1/3 angle 45 ° tilt 31.6 34.1 36.6 38.8 40.5 40.9 41.2 0 ° tilt 50 53.3 54.9 57.2 59.1 59.6

Brightness (nit) Hayes Tilt angle 70% 75% 80% 85% 90% 95% 98% 45 ° tilt 98.7% 98.2% 97.8% 96.3% 94.9% 90.3% 88.3% 0 ° tilt 100.0% 99.5% 99.2% 97.6% 96.1% 91.4% 89.6%

Referring to Table 3, it can be seen that the Moire phenomenon is attenuated even at 0 ° tilt when the haze value is 70% or more, although it is relatively susceptible to moiré at a tilt angle of 0 ° than at 45 ° tilt.

Table 4 shows the results obtained by comparing the viewing angles (1/2 angle and 1/3 angle) in the haze value region having a satisfactory level with the moire phenomenon attenuated. Referring to Table 4, although it is possible to reduce the occurrence of moiré even if the haze value is relatively lower than that at 0 ° tilt during 45 ° tilt, it is confirmed that the viewing angle characteristic is very low. Further, in order to improve the viewing angle characteristic, even if the haze value is increased up to the maximum value of 98%, the viewing angle characteristic of the 70% haze value at the time of 0 tilt is not satisfied, and the haze value of more than 95% is not significant. On the other hand, in the case of 0 ° tilt, the viewing angle characteristics are excellent in the haze range of 70% or more.

Table 5 shows the results of comparing the luminance deviations in the haze value region having a good level due to the attenuation of the moiré phenomenon, and shows the luminance deviation with respect to the minimum haze value of 70% or more, which is the confirmed moire attenuation effect. As a result, it was confirmed that the luminance lowering rate up to 95% can be realized within 10% of the haze value.

Therefore, in order to form a 10% or less luminance reduction ratio, the haze value range of the second diffusion layer 90 is set to 70 to 95 % ≪ / RTI > range.

5 and 6, since the reflective polarizing film 80, which is another optical functional layer, is integrated and laminated on the first prism sheet 60, various optical characteristics can be realized with a single member, The mechanical strength is improved, and handling can be simplified. By defining the correlation between the angle formed by the transmission axis of the reflective polarizing film 80 and the extending direction of the first prismatic layer 62 and the haze value of the second diffusion layer 90, Can be implemented.

6, since the wavelength conversion layer 10, the two prism sheets 60 and 70 and the reflective polarizing film 80 are integrated and laminated, it is possible to realize more various optical characteristics with a single member, The strength becomes excellent, and handling can be simplified.

Hereinafter, a display device according to embodiments of the present invention employing the above-described wavelength converting member will be described.

7 is a cross-sectional view of a display device according to an embodiment of the present invention. Fig. 7 illustrates a liquid crystal display device in which the wavelength converting member 3 of Fig. 6 is employed in an edge-type backlight assembly.

Referring to FIG. 7, a display device 700 according to the present embodiment includes a backlight assembly 400, and a display panel 500.

The backlight assembly 400 includes a light source 410, a light guide plate 415 for guiding light emitted from the light source 410, a reflection film 420 disposed below the light guide plate 415, And a wavelength conversion member (3) disposed thereon.

The light source 410 is disposed on both sides of the light guide plate 415. The light source 410 may be, for example, a light emitting diode (LED) that emits blue light. In another embodiment, the light source 410 may be disposed only on one side of the light guide plate 415. [

The light guide plate 415 moves the light emitted from the light source 410 through the total internal reflection, and emits the light upward through a scattering pattern formed on the lower surface of the light guide plate 415. A reflective film 420 is disposed under the light guide plate 415 to reflect the light emitted downward from the light guide plate 415 upward.

The wavelength converting member 3 is disposed on the upper side of the light guide plate 415, which is the optical path of the light emitted from the light source 410. Since the wavelength converting member 3 has been described in detail in the foregoing, a duplicate description will be omitted. Other optical sheets may be arranged above or below the wavelength converting member 3. [ For example, a diffusion film for diffusing incident light, a prism sheet for condensing incident light, a microlens, and / or a protective film may be further provided.

The light source 410, the light guide plate 415, the reflection film 415, and the wavelength converting member 3 may be received by the bottom chassis 440.

The display panel 500 may be a liquid crystal display panel. Specifically, the display panel 500 includes a first display panel 511, a second display panel 512, and a liquid crystal layer (not shown) interposed therebetween. The first display panel 511, the second display panel 512, (Not shown) attached to the surface of the polarizing plate. The transmission axis of the polarizing plate attached to the first display panel 511 may coincide with the transmission axis of the reflective polarizing film 80 of the wavelength converting member 3. [

The display device 700 may further include a top chassis 600 covering the edges of the display panel 500 and the side surfaces of the display panel 500 and the backlight assembly 400.

8 is a cross-sectional view of a display device according to another embodiment of the present invention. Fig. 8 illustrates a liquid crystal display device in which the wavelength converting member 3 of Fig. 6 is employed in a direct-type backlight assembly.

Referring to FIG. 8, a display device 701 according to the present embodiment includes a backlight assembly 401 and a display panel 500.

Since the display panel 500 and the top chassis 600 are substantially the same as those in the embodiment of FIG. 7, a duplicate description will be omitted.

The backlight assembly 701 includes at least one light source 411 housed in a storage container 441 and a storage container 441 and a light source 411 housed in the storage container 441 and having at least one light source 411, And a conversion member (3).

A support plate 416 may further be disposed under the wavelength conversion member 3. [ The support plate 416 may be a separate shielding layer, a shielding structure such as a diffusion plate, a diffusion plate, or the like, or a composite sheet combined with a light diffusion layer.

The storage container 441 accommodates at least one light source 411 and the wavelength converting member 3. The storage container 441 may include a bottom surface formed in a substantially rectangular shape and a side wall formed perpendicularly to each side of the bottom surface. A seating end on which the wavelength converting member 3 is seated may be provided on the side wall of the storage container 441. The side wall of the storage container 441 may partially extend upward from the seating end and then be bent downward.

A reflective sheet 421 may be disposed on the bottom surface of the storage container 441. Further, a sheet supporting protrusion 450 may be disposed on the bottom surface of the storage container 441. The sheet supporting protrusions 450 serve to prevent the wavelength conversion member 3 and / or the support plate 450 from being bent or struck convexly.

At least one light source 411 may be disposed on the bottom surface of the storage container 441. The light source 411 may be, for example, a light emitting diode (LED) that emits blue light.

The plurality of light sources 411 may be disposed apart from each other. When the plurality of light sources 411 are LEDs that are point light sources, the LEDs may be arranged in a matrix array according to a predetermined arrangement rule. For example, the LEDs may be arranged at equal intervals in the matrix direction, and the LEDs may be arranged in three rows, but the numbers are different for each row, such as five for the first row, seven for the second row, six for the third row Lt; / RTI > However, it goes without saying that the present invention is not limited to the above exemplified arrangement.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: wavelength conversion member
10: Wavelength conversion layer
21: first barrier layer
22: second barrier layer
40: first diffusion layer
50: back coating layer

Claims (8)

A wavelength conversion layer;
A first barrier layer disposed on one surface of the wavelength conversion layer;
A second barrier layer disposed on the other surface of the wavelength conversion layer;
A first diffusion layer disposed on the second barrier layer;
A first coupling layer disposed on the first diffusion layer;
A first prism sheet disposed on the first bonding layer;
A second bonding layer disposed on the first prism sheet;
A reflective polarizing film disposed on the second bonding layer and having a transmission axis;
A second diffusion layer disposed on the reflective polarizing film; And
And a back coat layer disposed under the first barrier layer,
Wherein the first diffusion layer includes surface irregularities, a part of the first diffusion layer penetrates into the first bonding layer, an air gap is defined between the first diffusion layer and the first bonding layer,
The haze value of the first diffusion layer is 70% or more,
The haze value of the second diffusion layer is 70% to 95%
The haze value of the back coating layer is smaller than the haze value of the first diffusion layer,
Wherein the first prism sheet includes a first prism pattern extending in one direction,
Wherein an angle formed between the extending direction of the first prism pattern and the transmission axis of the reflective polarizing film is 0 to 3 degrees. delete The method according to claim 1,
Wherein the wavelength conversion layer comprises a binder layer, a plurality of wavelength conversion particles dispersedly disposed on the binder layer, and scattering particles dispersedly disposed on the binder layer. The method according to claim 1,
Wherein a part of the first prism pattern penetrates into the second bonding layer and an air gap is defined between the first prism pattern and the second bonding layer. delete The method according to claim 1,
Further comprising a second prism sheet and a third bonding layer sequentially disposed between the first bonding layer and the first prism sheet,
Wherein the second prism sheet includes a second prism pattern extending in one direction,
Wherein a part of the second prism pattern penetrates into the third bonding layer and an air gap is defined between the second prism pattern and the third bonding layer. The method according to claim 6,
And the second prism pattern extends in a direction perpendicular to the extending direction of the first prism pattern. Light source;
A wavelength conversion member according to any one of claims 1, 3, 4, 6, and 7 disposed on an optical path of the light source; And
And a display panel disposed on the wavelength converting member.

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