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WO2019132367A1 - Feuille de diffusion ayant une performance de protection améliorée et unité de rétroéclairage la comprenant - Google Patents

Feuille de diffusion ayant une performance de protection améliorée et unité de rétroéclairage la comprenant Download PDF

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Publication number
WO2019132367A1
WO2019132367A1 PCT/KR2018/016072 KR2018016072W WO2019132367A1 WO 2019132367 A1 WO2019132367 A1 WO 2019132367A1 KR 2018016072 W KR2018016072 W KR 2018016072W WO 2019132367 A1 WO2019132367 A1 WO 2019132367A1
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WIPO (PCT)
Prior art keywords
layer
light
pattern
scattering
sheet
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Ceased
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PCT/KR2018/016072
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English (en)
Korean (ko)
Inventor
이기욱
이태준
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LMS Co Ltd
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LMS Co Ltd
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Publication date
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Publication of WO2019132367A1 publication Critical patent/WO2019132367A1/fr
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer

Definitions

  • the present invention relates to a diffusion sheet having improved shielding performance, and more particularly, to a diffusion sheet having improved shielding performance including a shielding layer having a different haze value in a diffusion sheet and a backlight unit having the same.
  • the liquid crystal display requires a backlight unit that provides uniform light throughout the screen, unlike the conventional CRT.
  • the backlight unit is provided with a light source lamp, a light guide unit for reflecting the light of the lamp, and a light condensing sheet unit, and converts the light into a surface light source.
  • the light source is disposed adjacent to the side surface of the light guide portion, and the light incident into the light guide portion is transmitted to the upper portion and is condensed by the light condensing sheet portion.
  • the light transmitted from the light guiding portion to the light converging sheet portion is refracted and reflected by the lower portion and is transmitted to the upper portion, so that the light is not uniformly dispersed and a variation occurs in each region.
  • a diffusion sheet is provided between the light collecting sheet portion and the light guiding portion to diffuse the light transmitted from the lower portion and disperse the light uniformly.
  • the diffusion sheet is made of a light-transmitting material and is configured to have a certain pattern on the upper surface or lower surface.
  • the light transmitted from the lower portion is diffused and transmitted to the upper portion, so that light is uniformly condensed in the light condensing sheet portion.
  • the present invention has been made to solve the above problems and it is an object of the present invention to provide a liquid crystal display device having a shield layer having a different haze value and a pattern scattering layer having a scattering pattern on an upper surface thereof, And a backlight unit having the diffusion sheet, which is capable of minimizing the luminance degradation, and having improved shielding performance.
  • a diffusion sheet having an improved shielding performance according to one aspect of the present invention.
  • the diffusion sheet is formed of a light transmitting material and has a predetermined thickness.
  • the diffusion sheet has a predetermined haze value,
  • a shielding layer including a plurality of particles and a scattering pattern formed on at least one of an upper surface and a lower surface of the shielding layer, the scattering pattern having a part protruded therein, a plurality of beads dispersed therein, And a scattering layer, wherein the beads are formed in a size relatively smaller than the particles contained in the shielding layer.
  • a backlight unit including a diffusion sheet having improved shielding performance.
  • the present invention has the following effects.
  • the diffusion sheet is provided on the upper and lower surfaces with a shielding layer having a predetermined haze value, and a pattern scattering layer having a scattering pattern and scattering light is provided, so that the pattern of the light guide plate disposed under the diffusion sheet is prevented from being viewed by the user There is an advantage to be able to do.
  • a separate bead is provided in the pattern scattering layer to increase the scattering and diffusing effect of light transmitted from below, and the bead is formed to have a size where mie-scattering occurs, Is transmitted to the upper portion, thereby minimizing the decrease in luminance.
  • FIG. 1 schematically shows a structure of a backlight unit having a diffusion sheet with improved shielding performance according to an embodiment of the present invention
  • FIG. 2 is a side view of the backlight unit of FIG. 1;
  • FIG. 3 is a schematic view of the configuration of a diffusion sheet in the backlight unit of Fig. 1; Fig.
  • FIG. 4 is a view showing whether a lower pattern is visible depending on the presence or absence of a shielding layer in the diffusion sheet of FIG. 3;
  • FIG. 5 illustrates a configuration in which separate beads are included in a pattern scattering layer in the diffusion sheet of FIG. 1;
  • FIG. 6 is a diagram showing scattering of light according to the arrangement of beads in the pattern scattering layer of FIG. 5;
  • FIG. 7 is a view showing a form in which scattering of light occurs according to the size of particles in the diffusion sheet of FIG. 5;
  • FIG. 8 shows a modified form of the pattern scattering layer of FIG. 5 in the diffusion sheet of FIG. 1;
  • FIG. 9 is a view showing a state in which a shielding layer is composed of multiple layers in the diffusion sheet of FIG. 1; FIG. And
  • FIG. 10 is a view showing a pattern in which the pattern scattering layer in the diffusion sheet of FIG. 1 is composed of multiple layers.
  • the diffusion sheet with improved shielding performance will be described as an example in which the diffusion sheet is applied to a backlight unit of a flat panel liquid crystal display device such as an LCD or an LED panel.
  • the present invention is not limited to this, and may be used alone as a diffusion sheet with improved shielding performance, or may be a backlight unit applied to a mechanism other than that applied to a liquid crystal display, And any device that changes the path.
  • FIG. 1 a configuration of a backlight unit according to the present invention will be schematically described with reference to FIGS. 1 to 4.
  • FIG. 1 a configuration of a backlight unit according to the present invention will be schematically described with reference to FIGS. 1 to 4.
  • FIG. 1 is a schematic view of a backlight unit having a diffusion sheet with improved shielding performance according to an exemplary embodiment of the present invention
  • FIG. 2 is a side view of the backlight unit of FIG.
  • FIG. 3 is a schematic view of the structure of the diffusion sheet in the backlight unit of FIG. 1
  • FIG. 4 is a view illustrating whether or not the lower pattern is visible depending on the presence or absence of the shielding layer in the diffusion sheet of FIG.
  • a backlight unit (BLU) for providing light to a liquid crystal panel must be provided in a liquid crystal display device.
  • the backlight unit according to the present invention mainly includes a light source 100, a light guide unit 200, a light condensing sheet unit 300, and a diffusion sheet 400.
  • the light source 100 generates light at the side of the light guide unit 200 and transmits light to the light guide unit 200 to minimize the volume of the backlight unit.
  • a light emitting diode (LED) and a cold cathode fluorescent lamp (CCFL) may be selectively used.
  • the light source 100 is composed of at least one light source, and emits light toward the side of the light guide unit 200.
  • the light guiding portion 200 has a thickness and is formed in a flat plate shape to transmit the light incident through the side surface to the upper portion.
  • the light incident on the light guide unit 200 is totally reflected in the light guide unit 200 and is emitted upward.
  • the light guiding unit 200 moves the light transmitted from the light source 100 along a flat plate, and is transmitted as an upper surface light source.
  • the light guide unit 200 may include a reflection plate 210 at a lower portion thereof, and reflect the light transmitted through the light guide unit 200 to the lower portion.
  • the light collecting sheet unit 300 is stacked on the light guiding unit 200 and collects the light transmitted from the lower part and transmits the collected light to the upper part in the form of a surface light source.
  • the light collecting sheet unit 300 is formed by stacking a plurality of sheets so as to condense light, or to form a single sheet, and to transmit the light transmitted from the lower portion to the upper portion.
  • the light collecting sheet unit 300 includes a pair of lower optical sheets 310 and an upper optical sheet 320, and the lower optical sheet 310 includes a first base film 312, 1 light collecting portion 314.
  • the first base film 312 is formed of a light transmitting material and has a predetermined thickness and is formed in a flat plate shape.
  • the first light collecting part 314 is formed on the upper surface to condense the light transmitted from the lower part.
  • the first condensing unit 314 is formed on the upper surface of the first base film 312, and the first unit condenser is continuously and repeatedly formed with a decreasing cross sectional area.
  • the first light collecting part 314 collects light transmitted through the first base film 312 and transmits the light to the upper part, and a plurality of first unit light collectors are formed.
  • the first unit condenser has a sloped surface and a cross-sectional area becomes smaller toward the upper portion, so that light is condensed through the sloped surface.
  • the first unit condenser has a pair of inclined surfaces, and is formed in a prism shape having a triangular cross-section along the up-and-down direction.
  • first unit condensers may be formed in a protrusion shape.
  • each of the first unit condensers may be elongated in a strip shape to form the first base film 312 As shown in FIG.
  • the first light collecting part 314 has a plurality of first unit collecting bodies formed so that the upper and lower end faces of the triangular shape extend along one direction, and light is condensed through the first unit collecting bodies.
  • the upper optical sheet 320 is stacked on the lower optical sheet 310 and includes a second base film 322 and a second light collecting part 324 to form the lower optical sheet 310, Converge the light together.
  • the second base film 322 is formed in a shape similar to that of the first base film 312, and a second light collecting portion 324 is formed on the upper surface.
  • the second light collecting part 324 is provided on the upper surface of the second base film 322 to condense the light transmitted from the lower part. Specifically, the second light collecting part 324 is formed in a shape similar to that of the first light collecting part 314, and the second unit light collecting material whose cross-sectional area decreases as it goes upward is continuously and repeatedly formed.
  • the second unit condenser has a pair of inclined surfaces and is formed to have a triangular top and bottom surfaces to condense light through the inclined surfaces.
  • the second unit condensers are formed on the upper surface of the second base film 322, respectively, in the same manner as the first unit condensers.
  • the first and second light collecting parts 314 and 324 may be elongated to intersect with the first and second base films 312 and 322, do.
  • the light collecting sheet unit 300 includes the first base film 312 and the second base film 322, and collects light transmitted from the lower portion of the light collecting sheet unit 300 and transmits the collected light.
  • the diffusion sheet 400 is provided between the light collecting sheet unit 300 and the light guiding unit 200 to diffuse and shield the light transmitted to the upper part and transmit the light to the light collecting sheet unit 300.
  • the diffusion sheet 400 not only diffuses and diffuses the light transmitted from the lower part, but also shields the light to make it uniform.
  • the diffusion sheet 400 includes a shielding layer 410 and a pattern scattering layer 420.
  • the shielding layer 410 is formed of a light transmitting material and has a predetermined thickness and is formed in a sheet shape to prevent the pattern of the light guide plate from being visible to a user by shielding the light transmitted from the lower portion and transmitting the light. .
  • a plurality of particles 412 are dispersed therein to have a predetermined haze value.
  • the haze characteristic is a characteristic that, when light passes through a transparent material, it diffuses depending on the kind of the material, as well as reflection or absorption, depending on the intrinsic properties of the material.
  • the shielding layer 410 is formed in a shape in which the particles 412 are dispersed therein, and is formed in a sheet form at the lower portion of the light condensing sheet portion 300 and stacked.
  • the particles 412 are made of materials such as silica, PMMA, and PBMA and have a size of 1 to 9 ⁇ and have a refractive index of about 1.5 and are dispersed in the shielding layer 410.
  • the particles 412 have a non-uniform size and scatter light transmitted from the lower part to shield the pattern of the light guide plate 200 from being visible.
  • the shielding layer 410 has a thickness of 18 to 130 ⁇ ⁇ and includes a plurality of the particles 412 therein.
  • the shielding layer 410 shields the pattern of the light guide plate 200 from being visually recognized by dispersing the particles uniformly dispersed in the inside of the shielding layer 410 and diffusing light transmitted from the bottom.
  • the shielding layer 410 is configured such that the particles 412 are dispersed therein to have a predetermined haze value.
  • the shielding layer 410 may have a specific pattern on the surface of the shielding layer 410 It is possible.
  • the pattern scattering layer 420 is stacked or bonded to at least one of the upper surface and the lower surface of the shielding layer 410 and a scattering pattern 422 protruding at least partially is formed to diffuse the light transmitted from the lower portion. .
  • the pattern scattering layer 420 is formed on the upper surface or the lower surface of the shielding layer 410 as shown in FIG.
  • the pattern scattering layer 420 has a refractive index different from that of the shielding layer 410 and is laminated or bonded.
  • the pattern scattering layer 420 diffuses light through the scattering pattern 422.
  • the pattern scattering layer 420 is laminated on the upper and lower surfaces of the shielding layer 410, and the scattering patterns 422 are protruded in the upper and lower directions.
  • the scattering pattern 422 has a curved surface in a spherical shape, and a plurality of the scattering patterns 422 are protruded and formed with nonuniform density and size.
  • the diffusion sheet 400 includes the shielding layer 410 and the pattern scattering layer 420, and the particles 412 dispersed in the shielding layer 410 and the pattern scattering
  • the layer 420 may shield and diffuse light transmitted from below.
  • the shielding layer 410 diffuses the light transmitted from the lower portion through a unique haze value and maintains the pattern scattering layer 420 like the base film.
  • the pattern scattering layer 420 diffuses the light transmitted from the lower portion together with the shielding layer 410 to prevent the diffusion sheet 400 and the light guide plate 200 from being attracted to each other or from being abraded.
  • the shield layer 410 and the pattern scattering layer 420 are formed to have different materials and refractive indices.
  • a diffusion sheet 400 is stacked on top of a general pattern to photograph an image to be transmitted.
  • a lower pattern is visible depending on the presence or absence of the shielding layer 410 Can be confirmed.
  • the shielding layer 410 does not have a haze value.
  • the shielding layer 410 does not have a haze value equal to or higher than a certain level, it can be confirmed that scattering occurs, but the lower pattern is visible.
  • the shielding layer 410 has no haze value
  • the light transmitted from the lower portion is diffused by the pattern scattering layer 420, but the light is not dispersed by the shielding layer 410, ) Is visible to the user.
  • the shielding layer 410 and the pattern scattering layer 420 are not provided, the light transmitted from the light guide plate 200 does not have a sufficient diffusion effect, so that the pattern of the light guide plate 200, And can be projected and recognized by the user in the form of a spot, a pattern, or the like.
  • the diffusion sheet 400 according to the present invention is arranged in a laminated structure on a specific pattern as in FIG. 4A.
  • the shielding layer 410 is configured to have a predetermined haze value or more, and in such a case, the lower pattern is diffused to such an extent that it can not be recognized.
  • the luminance can be minimized as the light transmitted from the lower portion is transmitted to the upper portion of the scattered light in the course of passing through the shielding layer 410 and the pattern scattering layer 420, have.
  • the shape of the scattering layer 420 can be adjusted by using structural deformations of the pattern scattering layer 420 and a separate bead 424, and a specific structure thereof will be described later with reference to FIG.
  • the diffusion sheet 400 not only diffuses light, but also increases the shielding performance of the light transmitted by the shielding layer 410 so that it can be diffused evenly.
  • FIG. 5 a modified form of the diffusion sheet 400 according to the present invention will be described with reference to FIGS. 5 to 7.
  • FIG. 5 is a modified form of the diffusion sheet 400 according to the present invention.
  • FIG. 5 is a view showing a configuration in which a separate bead 424 is included in the pattern scattering layer 420 in the diffusion sheet 400 of FIG. 1
  • FIG. 6 is a schematic view of a pattern scattering layer according to the arrangement of beads in the pattern scattering layer of FIG.
  • FIG. 7 is a view showing a form in which scattering of light occurs according to the size of the particles 412 in the diffusion sheet 400 of FIG. 5.
  • the basic structure of the diffusion sheet 400 is similar to that described above, but further includes a separate bead 424 inside the pattern scattering layer 420.
  • the pattern scattering layer 420 is formed on at least one of the upper surface and the lower surface with respect to the shielding layer 410.
  • the pattern scattering layer 420 includes a plurality of beads 424 therein, and further increases the shielding performance by further scattering and diffusing the light transmitted from the bottom by the beads 424, At the same time, the decrease in luminance is reduced.
  • the beads 424 are added to the pattern scattering layer 420 to further diffuse and scatter light due to the main purpose of increasing the shielding performance of light transmitted from the bottom.
  • the beads 424 have a spherical shape and are uniformly dispersed in the pattern scattering layer 420, and a plurality of the beads 424 are formed to have a non-uniform size. At this time, the beads 424 are formed to have a different material or refractive index from the pattern scattering layer 420, so that light scattering occurs in the pattern scattering layer 420.
  • the pattern scattering layer 420 includes the beads 424 therein, light scattered from the bottom of the bead 424 as well as the scattering pattern 422 can be scattered and diffused.
  • the beads 424 have a size that causes mie-scattering corresponding to the wavelength of the light transmitted from the lower part, and the beads 424 are relatively smaller than the particles 412 contained in the shield layer 410 .
  • the size of the beads 424 according to the present invention has a fine size of several hundreds of nanometers to several micrometers, and is configured so that scattering of light transmitted from below can occur.
  • scattering is a phenomenon in which light collides with a specific particle and is scattered in various directions. It refers to a phenomenon in which waves or high-speed particle beams collide with many molecules, atoms, and particles to change direction of motion and scatter. Gas, liquid, and solid. However, in solid or liquid, scattered light is synthesized and is more likely to be refracted or reflected.
  • Representative scattering includes Rayleigh scattering and Mie-scattering.
  • Rayleigh scattering refers to scattering occurring when the size of particles causing scattering is very small and is smaller than the wavelength of light, which is inversely proportional to the fourth power of the wavelength of light. That is, the amount of scattered light decreases sharply as the wavelength becomes longer.
  • Such Rayleigh scattering scatters light both forward and backward when light collides against a specific particle as shown in FIG. 7 (a).
  • Such scattering is influenced by the density, size and shape of the particles, and particularly scattering occurs in spherical particles.
  • the bead 424 according to the present invention is configured such that no scattering occurs in which forward scattering occurs in order to diffuse and transmit the light transmitted from the light source 100 in the upward direction.
  • the beads 424 have a spherical shape and are configured to have a size corresponding to the wavelength of the visible light region so that the light generated from the light source 100 can be scattered forward.
  • the beads 424 may be formed of at least one of Alumina, TiO 2 , Melamine, Silica, PMMA, PBMA, and PDMS, and may be formed in a spherical shape.
  • the refractive index of the bead 424 is preferably 1.67.
  • the beads 424 are formed to have a size of 0.1 to 1 ⁇ and maximize the mie scattering effect of the light of the visible light wavelength band emitted from the light source 100, 424 in the forward direction.
  • the bead 424 is more than 1000 nm in size, the bead 424 is fragile due to breaking or being touched upon contact with the light guide plate 200, resulting in deterioration of quality.
  • the bead 424 according to the present invention can scatter the light transmitted from the lower portion and is not damaged by the interference with the light guide plate 200, thereby diffusing the light transmitted from the lower portion.
  • the pattern scattering layer 420 according to the present invention can efficiently transmit the light transmitted from the lower light guide plate 200 to the upper portion by including the beads 424 therein, The decrease in luminance due to the layer 410 can be minimized.
  • the beads 424 are arranged such that the distribution density is relatively increased in the pattern scattering layer 420 so as to be closer to the shielding layer 410, thereby reducing light directivity transmitted from the lower portion,
  • the shielding performance of the diffusion sheet 400 may be increased.
  • the pattern scattering layer 420 is formed on the upper and lower surfaces of the shielding layer 410, and the beads 424 are contained therein.
  • the pattern scattering layer 420 can be divided into an A region along the vertical direction and a B region adjacent to the shielding layer 410.
  • the scattering pattern 422 is formed in the A region and the shielding layer 410 In the direction away from the center.
  • the beads 424 are distributed in the A region and the B region as shown in the region adjacent to the shielding layer 410, but the beads 424 are distributed in the region B more than the A region, Is distributed.
  • the beads 424 are distributed more in the region B than the region A in the region B adjacent to the shielding layer 410 in the pattern scattering layer 420, thereby increasing the shielding performance of the diffusion sheet 400.
  • FIG. 6A shows a state in which the beads 424 are uniformly distributed in the pattern scattering layer 420 and FIG. 6B shows a state in which the beads 424 are scattered in the pattern scattering layer 420, And the distribution density increases in the vicinity of the shielding layer 410.
  • the probability that the beads 424 are adjacent to the shielding layer 410 and the light transmitted from the lower part increases, thereby causing a difference in scattering degree of light.
  • the distribution density of the beads 424 is relatively higher in a region adjacent to the shielding layer 410 than in a uniform shape, so that light transmitted from the lower portion passes through the beads 424.
  • the beads 424 are arranged such that the distribution density is relatively larger in the region adjacent to the shielding layer 410 than in the remaining regions, as shown in FIG. 6B, It is possible to increase diffusion and scattering of the transmitted light.
  • the pattern scattering layer 420 according to the present invention is formed such that the distribution density of the beads 424 is increased toward the shielding layer 410 and the diffusion effect of light transmitted from the lower part is increased, .
  • the beads 424 have a nonuniform size in a spherical shape as described above, and are formed to have a size such that light transmitted from the lower portion is not scattered.
  • FIG. 8 is a view showing a modified form of the pattern scattering layer 420 of FIG. 5 in the diffusion sheet of FIG.
  • the basic structure is similar to that of FIG. 5, but the arrangement of the beads 424 provided in the pattern scattering layer 420 is different.
  • the pattern scattering layer 420 is formed on the upper and lower surfaces with respect to the shielding layer 410.
  • the bead 424 has a density (density) closer to the shielding layer 410, Is increased.
  • the beads 424 are uniformly distributed in the lower pattern scattering layer 420.
  • the beads 424 are dispersed inside as described above with reference to FIG. 4, and the distribution density increases when the shielding layer 410 is adjacent to the upper pattern scattering layer 420, Minimizing the pathway maximizes scattering and diffusion effects.
  • the light passing through the shielding layer 410 is diffused and scattered by the upper pattern scattering layer 420 to improve the shielding performance.
  • the lower pattern scattering layer 420 uniformly distributes the beads 424 therein, thereby maximizing the non-scattering effect due to the beads 424.
  • the lower pattern scattering layer 420 may be formed using the bead (424) are uniformly distributed.
  • the beads 424 inside the lower pattern scattering layer 420 may not be distributed evenly, and may be configured to have a relatively high density at a specific position.
  • the diffusion sheet 400 includes the pattern scattering layer 420 on the upper surface of the shielding layer 410,
  • the bead 424 has a relatively high distribution density in the B region.
  • the beads 424 should be formed to have a size capable of causing non-scattering as described above, so that the brightness is not reduced.
  • the diffusion and shielding of light can be performed only with the diffusion sheet 400 according to the present invention without lowering the brightness.
  • FIG. 9 is a view showing a state in which the shielding layer 410 in the diffusion sheet 400 of FIG. 1 is composed of multiple layers.
  • the shielding layer 410 is composed of a plurality of sheets and each has a predetermined haze value.
  • the shielding layer 410 is not a single layer, but a plurality of sheets are stacked.
  • the shielding layer 410 is composed of a first sheet 410a and a second sheet 410b.
  • the first sheet 410a has a first haze value as a light transmitting material
  • the second sheet 410b has a second haze value.
  • the first sheet 410a and the second sheet 410b may have different thicknesses.
  • the first sheet 410a and the second sheet 410b have mutually different haze values and are stacked and bonded together to form the shielding layer 410, thereby increasing the shielding performance of light transmitted from the lower portion .
  • the first sheet 410a has a thickness L1 and the second sheet 410b has a thickness L2.
  • the first sheet 410a and the second sheet 410b are configured to have a first haze value and a second haze value, respectively.
  • the first sheet 410a and the second sheet 410b may include the particles 412, And is configured to have a different haze value.
  • the pattern scattering layer 420 is coupled to an upper portion of the shielding layer 410 including the first sheet 410a and the second sheet 410b.
  • the shielding layer 410 may be formed of a plurality of sheets and may have different thicknesses or different haze values to increase the shielding performance of light transmitted from the lower portion of the shielding layer 410, ) The entire thickness can be adjusted.
  • the pattern scattering layer 420 may further include the beads 424, and the light transmitted from the lower portion may be diffused by the beads 424, .
  • the beads 424 have a non-uniform size in a spherical shape and are dispersed in the pattern scattering layer 420.
  • the shielding layer 410 may be configured to have a plurality of layers and have different haze values, thereby increasing the shielding performance of light .
  • the pattern scattering layer 420 is formed of multiple layers in the diffusion sheet 400 of the present invention.
  • FIG. 10 is a diagram showing a pattern scattering layer 420 in the diffusion sheet of FIG. 1, which is composed of multiple layers.
  • the pattern scattering layer 420 is formed on the first layer 420a having the scattering pattern 422 and the first layer 420a having the scattering pattern 422. However, And a second layer 420b disposed between the first electrode layer 420 and the shielding layer 410.
  • the first layer 420a is continuously formed in the second layer 420b, and the scattering pattern 422 protruding upward is formed.
  • the scattering pattern 422 is the same as the structure described above with reference to FIG. 1, and scatters light transmitted from the bottom in a nonuniform form.
  • the bead 424 is not included in the first layer 420a.
  • the bead 424 may be formed at a relatively lower density than the second layer 420b, 424 may be provided.
  • the second layer 420b is formed in a sheet shape, and a plurality of the beads 424 are dispersed therein, and the beads 424 spread and scatter light.
  • the second layer 420b is laminated on the upper surface of the shielding layer 410 in a sheet form, and the first layer 420a is laminated on the upper layer.
  • the beads 424 provided in the second layer 420b have a size smaller than that of the particles 412 as described above and are formed to have a size capable of scattering light transmitted from below.
  • the pattern scattering layer 420 is composed of the first layer 420a and the second layer 420b and the bead 424 is included in the second layer 420b,
  • the beads 424 are concentratedly distributed on the entire surface of the substrate 420 adjacent to the shielding layer 410.
  • the distribution density of the beads 424 increases as the shielding layer 410 is closer to the shielding layer 410, thereby increasing diffusion and scattering effect of light transmitted from the lower portion.
  • the diffusion sheet 400 having improved shielding performance according to the present invention and the backlight unit including the diffusion sheet 400 have been described.
  • the diffusion sheet 400 includes a shielding layer 410 having a predetermined haze value, It is possible not only to diffuse the light to be scattered but also to increase the shielding performance through scattering.
  • the light can be uniformly transmitted by preventing the pattern of the light guide plate 200 from being transmitted to the upper portion, and the bead 424 is not scattered It is possible to minimize the luminance drop due to diffusion and scattering of light.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

La présente invention concerne une feuille de diffusion ayant une performance de protection améliorée, la feuille de diffusion comprenant : une couche de protection constituée d'un matériau transmettant la lumière, formée pour avoir une épaisseur prédéterminée, et contenant une pluralité de particules selon une valeur de trouble prédéterminée ; et une couche de diffusion à motifs formée sur au moins la surface supérieure et/ou la surface inférieure de la couche de protection, comprenant un motif de diffusion partiellement en saillie, et ayant une pluralité de billes dispersées dans celle-ci de façon à diffuser la lumière transmise depuis le côté inférieur de celle-ci, les billes étant formées pour avoir une taille relativement plus petite que les particules contenues dans la couche de protection.
PCT/KR2018/016072 2017-12-29 2018-12-18 Feuille de diffusion ayant une performance de protection améliorée et unité de rétroéclairage la comprenant Ceased WO2019132367A1 (fr)

Applications Claiming Priority (2)

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KR10-2017-0183284 2017-12-29
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