WO2010114345A2 - Light guide plate comprising light diffusing particles - Google Patents
Light guide plate comprising light diffusing particles Download PDFInfo
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- WO2010114345A2 WO2010114345A2 PCT/KR2010/002056 KR2010002056W WO2010114345A2 WO 2010114345 A2 WO2010114345 A2 WO 2010114345A2 KR 2010002056 W KR2010002056 W KR 2010002056W WO 2010114345 A2 WO2010114345 A2 WO 2010114345A2
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- light
- guide plate
- light guide
- pattern
- optical
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- 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
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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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
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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
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- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
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- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
Definitions
- the present invention relates to a backlight unit of a liquid crystal display (LCD) device, and in particular, by providing an optical pattern and / or light diffusing particles in a lower part of a light guide plate, hot spots and bright lines are generated in the light incident part.
- the present invention relates to a light guide plate and a backlight unit using the same, which can prevent and improve luminance and luminance uniformity.
- LCD liquid crystal display
- PDP plasma display panel
- ELD electro luminescent display
- VFD vacuum fluorescent display
- LCD is widely used as a mobile flat panel display because of its excellent image quality, light weight, thinness, and low power consumption.
- the LCD structure further includes a backlight unit as a light source of the liquid crystal display panel in addition to the liquid crystal display panel, and the backlight unit uniformly supplies a high brightness light source to the liquid crystal display panel, thereby realizing high quality images.
- backlights of liquid crystal displays are classified into edge-lighting and direct-lighting backlights according to the manner in which the light sources are arranged.
- the side backlight is mainly used in LCDs for thinning portable communication devices, and the direct backlight is mainly used in LCDs for large screens such as notebooks or TV monitors due to high efficiency.
- FIG. 1 is a diagram illustrating a general side type backlight unit structure.
- the backlight unit 10 includes a light source 1, a reflecting plate 2, a light guide plate 3, a diffusion film 4, a first prism sheet 5, and a second prism sheet 6. And a protective sheet 7.
- the light source 1 emits light for the first time, and includes cylindrical fluorescent lamps such as Cold Cathode Fluorescent Lamp (CCFL), Hot Cathode Fluorescent Lamp (HCFL), and External Electrode Fluorescent Lamp (EEFL), and LED (Light Emitting Diode) devices.
- CCFL Cold Cathode Fluorescent Lamp
- HCFL Hot Cathode Fluorescent Lamp
- EEFL External Electrode Fluorescent Lamp
- LED Light Emitting Diode
- EL Electro Luminescent
- the light emitted from the light source 1 is incident on the light guide plate 3 to cause total reflection inside the light guide plate 3, and the light incident on the surface of the light guide plate 3 at an angle of incidence smaller than the critical angle is not totally reflected. Because it is transmitted without, it is emitted to the upper side and the lower side.
- the reflector 2 reflects the light emitted downward and re-enters the light guide plate 3 to improve the light efficiency, and the diffuser film 4 diffuses the light emitted through the upper surface of the light guide plate 3. To make the luminance uniform and to widen the viewing angle.
- the first prism sheet 5 is composed of a base portion 5-1 and a prism pattern arrangement portion 5-2 to firstly condense the light incident from the diffusion film 4 to vertically enter the LCD element.
- the second prism sheet 6 has the same configuration as that of the first prism sheet 5, and the second prism sheet 6 emits light by secondary condensing in order to increase the luminance uniformity of the light primarily collected in the first prism sheet 5.
- the first prism sheet 5 and the second prism sheet 6 may be arranged such that the prism patterns of the first prism sheet 5 and the prism patterns of the second prism sheet 6 are perpendicular to each other. Is common.
- the protective sheet 7 is positioned on the upper surface of the first prism sheet 5 or the upper surface of the second prism sheet 6 to generate scratches on the first prism sheet 5 or the second prism sheet 6. Prevent it.
- the conventional backlight unit includes a reflector 2, a light guide 3, a diffusion film 4, a prism sheet 5, 6, and a protective sheet 7 to provide light in a direction perpendicular to the front of the LCD element. Since many parts, such as the manufacturing process is complicated, there is a problem that takes a lot of manufacturing costs.
- a prism light guide plate may be used to form a prism on the rear surface of the light guide plate for high brightness and low cost.
- the prism light guide plate is a light guide plate having a fine pitch prism pattern formed on a rear surface thereof.
- the luminance may be higher than that of the conventional backlight unit.
- FIG. 2 is a diagram illustrating a structure of a backlight unit using a conventional prism light guide plate
- FIG. 3 is a diagram illustrating a luminance distribution of a backlight unit using a conventional prism light guide plate.
- the backlight unit 10 includes a prism light guide plate 13, a plurality of point light sources 23 disposed on one side of the prism light guide plate 13, and a reflector plate disposed on a bottom surface of the prism light guide plate 13. 27).
- the light When light is irradiated from the point light source 23, the light is incident on the light incidence part 13a provided on the side of the prism light guide plate 13, and then reflected inside the prism light guide plate 13, so that the upper light exit part of the prism light guide plate 13 is formed. Exit through 13b).
- the light irradiated from the point light source 23 to the light incidence portion 13a generates a point-shaped light condensation portion having a relatively high light intensity near the light incidence portion 13a, and is caused by the prism pattern 16 of the prism light guide plate 13.
- Light collected in such a light condensing unit is spectroscopic, and bright lines are generated in an oblique direction (see FIG. 3).
- the prism is formed to be rounded or the prism pattern 16 is applied to the light incident portion 13a.
- the prism is formed to be rounded or the prism pattern 16 is applied to the light incident portion 13a.
- there is a limit in removing such oblique lines since the side light emitting unit is used in a notebook or a mobile phone, there is a problem that the prism light guide plate cannot be used due to the oblique line in the diagonal direction.
- an object of the present invention is to prevent the occurrence of hot spots and bright lines generated at the light incidence portion of the light guide plate, to improve luminance and brightness uniformity, and to reduce the number of optical films used on the top surface of the light guide plate. It is an object of the present invention to provide a light guide plate having light diffusing particles which can reduce the unit manufacturing time and cost.
- the light guide plate of the present invention includes a pattern part layer having a plurality of optical patterns formed on at least one surface in a light guide plate capable of emitting light incident from a side light source to an upper surface, and in the optical pattern of the pattern part layer.
- a plurality of light diffusing particles are dispersed and the refractive index of the base material of the pattern portion layer and the light diffusing particles is different.
- the backlight unit of the present invention includes a side light source disposed on one side, and a light guide plate for emitting light incident from the side light source to an upper surface, wherein the light guide plate has a plurality of optical patterns on at least one surface thereof.
- the pattern part layer is formed, and a plurality of light diffusing particles are dispersed in the optical pattern of the pattern part layer, and the refractive indexes of the base material of the pattern part layer and the light diffusing particles are different.
- the backlight unit according to the present invention provides a light guide plate coated with light diffusing particles having diffusion and condensing effects, and thus, when a light guide plate having a plurality of optical patterns formed thereon is used, a bright line and a hot spot generated in a conventional backlight unit ( Appearance problems such as hot spots can be improved, and brightness uniformity can be improved.
- the light guide plate according to the present invention when used, instead of using a plurality of prism sheets, only one inverted prism sheet can be used to obtain higher luminance than a conventional backlight unit, thereby reducing the time and cost of manufacturing the backlight unit. There is a saving effect.
- FIG. 1 is a diagram illustrating a general side type backlight unit structure.
- FIG. 2 is a diagram illustrating a structure of a backlight unit using a conventional prism light guide plate.
- FIG. 3 is a diagram illustrating luminance distribution of a backlight unit using a conventional prism light guide plate.
- FIG. 4 is a side view and a light path of a backlight unit including a light guide plate according to a first embodiment of the present invention
- Figure 5 is a top view of a backlight unit including a light guide plate according to a second embodiment of the present invention
- FIG. 6 is a diagram illustrating a top view of a backlight unit including a light guide plate according to a third embodiment of the present invention.
- FIG. 7 to 10 illustrate the shape of an optical pattern formed on a pattern portion layer of a light guide plate according to an embodiment of the present invention.
- FIG. 11 illustrates a method of manufacturing a light guide plate according to an embodiment of the present invention
- FIG. 12 illustrates a method of manufacturing a light guide plate according to another embodiment of the present invention.
- FIG. 13 illustrates the shape of light diffusing particles included in the light guide plate according to the exemplary embodiment of the present invention
- FIG. 14 illustrates the light diffusing degree according to the shape of the light diffusing particles included in the light guide plate according to the embodiment of the present invention. It is a figure which shows the result of a simulation.
- FIG. 15 illustrates the shape of light diffusing particles included in the light guide plate according to the exemplary embodiment of the present invention
- FIG. 16 illustrates the light diffusing degree according to the shape of the light diffusing particles included in the light guide plate according to the embodiment of the present invention. It is a figure which shows the result of a simulation.
- 17 is a view for explaining the length to the vertex of the optical pattern of the pattern portion layer according to the present invention.
- FIG. 18 is a diagram for measuring luminance uniformity and average luminance of the backlight unit according to the present invention.
- FIG. 19 is a view illustrating a light incident part of a backlight unit using a general light guide plate
- FIG. 20 is a view illustrating a light incident part of a backlight unit using a light guide plate according to the present invention.
- FIG. 4 is a side view and a light path of the backlight unit including the light guide plate according to the first embodiment of the present invention
- FIG. 5 is a top view of the backlight unit including the light guide plate according to the second embodiment of the present invention
- FIG. 6 is a diagram illustrating a top view of a backlight unit including a light guide plate according to a third embodiment of the present invention.
- the backlight unit 1000 includes a light guide plate 100, a light source 200, and a reflector 300.
- the light guide plate 100 emits light incident from the side light source 200 to an upper surface, and includes a pattern part layer 110 having a plurality of optical patterns formed on at least one side thereof, and a plurality of lights in the optical pattern of the pattern part layer. Diffusion particles 120 are dispersed.
- the light diffusing particles 120 are applied to the pattern part layer 110 so as to be integrated with each other, and the light diffusing particles 120 having a different refractive index from the base material of the pattern part layer 110 are coated to be dispersed.
- the pattern portion layer 110 of the light guide plate 100 may be formed only on the top or bottom surface of the light guide plate 100, as shown in FIGS. 4 and 5, and as shown in FIG.
- the pattern part layers 110a and 110b formed on the upper and lower surfaces may be formed in parallel to each other or vertically.
- FIG. 7 to 10 illustrate the shape of an optical pattern formed on a pattern portion layer of a light guide plate according to an embodiment of the present invention, wherein the optical pattern is a polygon pattern (FIGS. 7 and 8) and a polygon pattern having a curved upper surface ( 9) and an arc pattern (FIG. 10) may be variously formed.
- the optical pattern is a polygon pattern (FIGS. 7 and 8) and a polygon pattern having a curved upper surface ( 9) and an arc pattern (FIG. 10) may be variously formed.
- FIG. 11 illustrates a method of manufacturing a light guide plate according to an embodiment of the present invention
- FIG. 12 illustrates a method of manufacturing a light guide plate according to another embodiment of the present invention.
- an optical pattern in one embodiment, a triangular prism pattern
- a substrate for example, PET: Poly Ethylene Terephthalate
- the particles 120 are dispersed, and as shown in FIG. 12, a coating layer including the light diffusing particles 120 is formed on the substrate 110 (eg, a UV resin including light diffusing beads).
- the coating layer may be formed by irregularly dispersing light diffusing particles, which are fine particles, by coating and curing a coating liquid containing light diffusing particles, and the light diffusing particles may be formed by refracting or transmitting light transmitted therethrough. To diffuse uniformly.
- FIGS. 14 and 16 illustrate the light diffusing particles included in the light guide plate according to the embodiment of the present invention.
- the light diffusing particles according to the present invention may be formed in various forms such as hollow spheres, hollow spheres, polygonal shapes, and the like, and the material of the light diffusing particles may be glass, acrylic, nylon, or silicon-based compounds, or the materials. It may be composed of a compound containing at least one.
- the light diffusion particles have a hollow, the outer shell may be made of a material having a refractive index smaller than the pattern portion layer.
- the shell of the light diffusing particles may be formed of glass bubbles made of glass and the hollows produced in vacuum.
- the pattern portion layer A including the light diffusing particles is formed of a material having a refractive index of 1.58, and the light diffusing particles B have a hollow shape and have a refractive index of 1.52. It is formed of a substance. Referring to the light diffusivity shown in FIG. 14, light incident from the point light source is refracted or reflected through the pattern sublayer and the light diffusing particles having different refractive indices.
- the pattern portion layer A including the light diffusing particles is formed of a material having a refractive index of 1.58, and the light diffusing particles B have a hollow sphere with a refractive index of 1.52. It is formed of a phosphorous material and is maintained in a vacuum state with a refractive index of 1.00 in the hollow.
- the light diffusivity shown in FIG. 16 light incident from a point light source is primarily refracted or reflected at the surface of the light diffusing particle and the pattern sublayer having different refractive index, and is transmitted to the hollow inside the light diffusing bead. Refraction or reflection is achieved differentially. Therefore, the light transmitted from the point light source can be diffused into a uniform surface light source.
- the backlight unit includes a side light source disposed on one side, and a light guide plate for emitting the light incident from the side light source to the upper surface, the light guide plate is provided with a pattern portion layer formed with a plurality of optical patterns on one side In the optical pattern of the pattern part layer, a plurality of light diffusing particles are dispersed, and the refractive indexes of the base material of the pattern part layer and the light diffusing particles are different.
- the backlight unit may further include an inverted prism sheet disposed on the light guide plate, the prism being formed in a direction perpendicular to the extension direction of the plurality of optical patterns formed on the light guide plate to collect light diffused on the light guide plate.
- the brightness of the backlight unit is determined according to the size and content of the light diffusing particles dispersed in the pattern portion layer of the light guide plate. That is, light diffusivity may vary depending on the size and content of the light diffusing particles, thereby determining turbidity, light transmittance, average luminance, and light uniformity.
- the light-diffusing particle content in the optical pattern of the pattern portion layer of the light guide plate according to the present invention is characterized in that it is contained in a ratio of 1% or more and 27% or less with respect to the coating layer for fixing the light diffuser particles.
- the size of the light diffusing particles is characterized in that the ratio of the height of the optical pattern to the diameter length of the light diffusing particles is formed from 0.5% to 15%.
- the relationship between the content, turbidity, and transmittance of the light diffusing particles is shown in [Table 1], and the light transmittance must be 90% or more to be utilized as a backlight unit.
- the content of the light diffusing particles is calculated as (volume of the light diffusing particles / volume of the coating layer) * 100.
- the content of the light diffusing particles is preferably contained in a ratio of 1% or more and 27% or less with respect to the coating layer. That is, when the light diffusing particle content exceeds 27%, the light transmittance of the backlight unit may be 90% or less, which may cause a problem of deterioration in brightness.
- the light diffusing particle content is less than 1%, the turbidity becomes less than 80%. There is a problem that the function of diffusing light cannot be sufficiently performed.
- the relationship between the size of the light diffusing particles included in the light guide plate according to the present invention and the height of the optical pattern of the pattern part layer is shown in Table 2, and the size of the light diffusing particles is 90% or more in average luminance and 80% in light uniformity. It is preferable to be formed above.
- the size (%) of the light diffusing particles is calculated as (the diameter of the light diffusing particles / the height of the optical pattern) * 100, the height of the optical pattern as shown in Figure 17, when the optical pattern is a triangular prism pattern It means the length from the bottom to the vertex of the triangular prism pattern, in the case of the polygon shape means the length from the lowest point to the highest point of the optical pattern.
- the average luminance (%) represents the sum of the luminance values of the points measuring the luminance divided by the number of measurement points as a percentage, and the luminance uniformity (%) is the minimum luminance value among the luminance values of the measurement points.
- the value divided by the value is multiplied by 100 (see FIG. 18).
- the length of the diameter of the light diffusing particles to the height of the optical pattern is preferably 0.5% or more and 15% or less. That is, when less than 0.5%, the uniformity is lowered, and when it exceeds 15%, the average brightness is lowered, which causes a problem that the product quality is not satisfied.
- the pattern portion layer is formed as the optical pattern is densely spaced apart from any one side to improve the light diffusion effect, characterized in that the light diffusion particles are disposed between the optical pattern of the pattern layer portion. . That is, a plurality of light diffusing particles formed between the optical patterns of the pattern portion layer protruding toward the reflecting plate side are formed, and serves to diffuse the light transmitted from the light source to the top.
- FIG. 19 illustrates a light incidence part of a backlight unit using a general prism light guide plate
- FIG. 20 illustrates a light incidence part of a backlight unit using a light guide plate according to the present invention.
- the present invention is not limited to the above-described typical preferred embodiment, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions in the art réelle who has this can easily understand it. If such improvement, change, substitution or addition is carried out within the scope of the appended claims, the technical spirit should also be regarded as belonging to the present invention.
- the present invention relates to a light guide plate having strongly diffusing particles, and is an invention that can be usefully used in the technical field of the present invention to improve uniform light scattering and pattern non-incident phenomenon which have been a problem in the conventional light guide plate.
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The present invention relates to a backlight unit of a liquid crystal display (LCD) apparatus, and more specifically to a light guide plate capable of condensing incident light from a side light source with respect to a horizontal or vertical view angle distribution according to an optical pattern formed on the lower surface of the light guide plate and then emitting said light towards an upper surface. The light guide plate of the present invention comprises: a patterned layer having a plurality of optical patterns formed on at least one surface, and a plurality of light diffusing particles dispersed in the optical patterns of the patterned layer, wherein a preform of the patterned layer and the light diffusing particles have different indexes of refraction. With the present invention, hot spots and bright lines that occur at a light source and incident light are suppressed, brightness and brightness uniformity are improved, and light, by nature of the light guide plate, is condensed with respect to horizontally and vertically directed view angle distributions according to a given optical pattern, so a reduced number of optical sheets for use in central emission of light onto the upper surface of the light guide plate can be used, which in turn reduces time and cost required for manufacturing such backlight units, thereby making the present invention useful for improving optical characteristics and for lowering manufacturing costs.
Description
본 발명은 액정 디스플레이(Liquid Crystal Display: LCD) 장치의 백라이트 유닛에 관한 것으로, 특히 도광판의 하부에 광학패턴 및/또는 광확산 입자를 구비함으로써 입광부에서의 핫스팟(Hot-spot) 및 휘선 발생을 방지하고, 휘도 및 휘도 균일성을 향상시킬 수 있는 도광판 및 이를 이용한 백라이트 유닛에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit of a liquid crystal display (LCD) device, and in particular, by providing an optical pattern and / or light diffusing particles in a lower part of a light guide plate, hot spots and bright lines are generated in the light incident part. The present invention relates to a light guide plate and a backlight unit using the same, which can prevent and improve luminance and luminance uniformity.
최근 정보화 사회가 도래함에 따라 표시장치에 대한 요구도 다양한 형태로 증가하고 있으며, 이에 따라 LCD(Liquid Crystal Display)나 PDP(Plasma Display Pannel), ELD(Electro Luminescent Display), VFD(Vacuum Fluorescent Display) 등의 여러 가지 평판형 표시 장치가 연구 개발되어 활용되고 있다. 여기서 LCD는 화질이 우수하고 경량, 박형, 저소비 전력의 장점으로 인해 이동형 평판 표시 장치로 많이 사용되고 있다. Recently, as the information society arrives, the demand for display devices is increasing in various forms. Accordingly, liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and vacuum fluorescent display (VFD) Various flat panel display devices have been researched and developed. Here, LCD is widely used as a mobile flat panel display because of its excellent image quality, light weight, thinness, and low power consumption.
그러나, LCD는 그 자체에서 빛을 발하지 못하여 고품질의 화상을 실현하기 위해서는 별도의 외부 광원을 필요로 한다. 따라서 이러한 LCD의 구조는 액정표시패널 외에 상기 액정표시패널의 광원으로 백라이트 유닛을 더 포함하여 구성되며, 백라이트 유닛이 액정표시패널로 고휘도의 광원을 균일하게 공급함으로써 고품질의 화상을 구현하게 된다. However, LCDs do not emit light by themselves and require a separate external light source to realize a high quality image. Therefore, the LCD structure further includes a backlight unit as a light source of the liquid crystal display panel in addition to the liquid crystal display panel, and the backlight unit uniformly supplies a high brightness light source to the liquid crystal display panel, thereby realizing high quality images.
일반적으로, 액정표시장치의 백라이트는 광원이 배치되는 방식에 따라 측면형(Edge-lighting)과 직하형(Direct-lighting) 백라이트로 구분된다. In general, backlights of liquid crystal displays are classified into edge-lighting and direct-lighting backlights according to the manner in which the light sources are arranged.
측면형 백라이트는 비교적 얇은 두께로 인하여 휴대용 통신기기 등의 박형화를 목적으로 하는 LCD에 주로 사용되며, 직하형 백라이트는 높은 효율에 의해 노트북이나 TV 모니터 등의 대화면을 목적으로 하는 LCD에 주로 사용된다.Due to the relatively thin thickness, the side backlight is mainly used in LCDs for thinning portable communication devices, and the direct backlight is mainly used in LCDs for large screens such as notebooks or TV monitors due to high efficiency.
도 1은 일반적인 측면형 백라이트 유닛 구조를 도시한 도면이다.1 is a diagram illustrating a general side type backlight unit structure.
도 1에 도시된 바와 같이, 백라이트 유닛(10)은 광원(1), 반사판(2), 도광판(3), 확산필름(4), 제1프리즘시트(5), 제2프리즘시트(6) 및 보호시트(7)로 구성된다. As shown in FIG. 1, the backlight unit 10 includes a light source 1, a reflecting plate 2, a light guide plate 3, a diffusion film 4, a first prism sheet 5, and a second prism sheet 6. And a protective sheet 7.
광원(1)은 최초로 광을 발산하는 부분으로, CCFL(Cold Cathode Fluorescent Lamp), HCFL(Hot Cathode Fluorescent Lamp), EEFL(External Electrode Fluorescent Lamp) 등의 원통형 형광램프와 LED(Light Emitting Diode) 소자, EL(Electro Luminescent) 소자 등이 사용된다. The light source 1 emits light for the first time, and includes cylindrical fluorescent lamps such as Cold Cathode Fluorescent Lamp (CCFL), Hot Cathode Fluorescent Lamp (HCFL), and External Electrode Fluorescent Lamp (EEFL), and LED (Light Emitting Diode) devices. EL (Electro Luminescent) elements and the like are used.
광원(1)에서 방출된 빛은 도광판(3)으로 입사되어, 도광판(3) 내부에서 전반사를 일으키며 진행하며, 임계각보다 작은 각도의 입사각으로 도광판(3) 내부의 표면에 입사되는 광은 전반사되지 않고 투과되므로, 상측과 하측으로 방출된다.The light emitted from the light source 1 is incident on the light guide plate 3 to cause total reflection inside the light guide plate 3, and the light incident on the surface of the light guide plate 3 at an angle of incidence smaller than the critical angle is not totally reflected. Because it is transmitted without, it is emitted to the upper side and the lower side.
이때, 반사판(2)은 하측으로 방출된 광을 반사하여 도광판(3)으로 재입사시켜 광효율을 향상시켜 주고, 확산필름(4)은 상기 도광판(3)의 상부면을 통해 방출되는 광을 확산시켜 휘도를 균일하게 하고, 시야각을 넓혀준다. In this case, the reflector 2 reflects the light emitted downward and re-enters the light guide plate 3 to improve the light efficiency, and the diffuser film 4 diffuses the light emitted through the upper surface of the light guide plate 3. To make the luminance uniform and to widen the viewing angle.
제1프리즘시트(5)는 기저부(5-1)와 프리즘 패턴 배열부(5-2)로 구성되어 확산필름(4)으로부터 입사하는 광을 굴절시켜 LCD 소자에 수직으로 입사하도록 1차 집광하여 방출하고, 제2프리즘시트(6)는 제1프리즘시트(5)와 동일한 구성을 가지며, 제1프리즘시트(5)에서 1차 집광된 광의 휘도 균일성을 높이기 위해 2차 집광하여 방출한다. 휘도 균일성을 향상시키기 위해서 제1프리즘시트(5)와 제2프리즘시트(6)는 제1프리즘시트(5)의 프리즘 패턴과 제2프리즘시트(6)의 프리즘 패턴들이 수직이 되도록 배치하는 것이 일반적이다. The first prism sheet 5 is composed of a base portion 5-1 and a prism pattern arrangement portion 5-2 to firstly condense the light incident from the diffusion film 4 to vertically enter the LCD element. The second prism sheet 6 has the same configuration as that of the first prism sheet 5, and the second prism sheet 6 emits light by secondary condensing in order to increase the luminance uniformity of the light primarily collected in the first prism sheet 5. In order to improve luminance uniformity, the first prism sheet 5 and the second prism sheet 6 may be arranged such that the prism patterns of the first prism sheet 5 and the prism patterns of the second prism sheet 6 are perpendicular to each other. Is common.
보호시트(7)는 제1프리즘시트(5) 상부면 또는 제2프리즘시트(6) 상부면에 위치하여 제1프리즘시트(5) 또는 제2프리즘시트(6)에 스크래치(scratch)가 발생하는 것을 방지한다.The protective sheet 7 is positioned on the upper surface of the first prism sheet 5 or the upper surface of the second prism sheet 6 to generate scratches on the first prism sheet 5 or the second prism sheet 6. Prevent it.
상술한 바와 같이 종래 백라이트 유닛은 LCD 소자 전면에 수직하는 방향으로 광을 제공하기 위해 반사판(2), 도광판(3), 확산필름(4), 프리즘시트(5, 6) 및 보호시트(7) 등과 같은 많은 부품을 필요로 하므로 제조공정이 복잡해지고 제조비용도 많이 소요되는 문제점이 있다.As described above, the conventional backlight unit includes a reflector 2, a light guide 3, a diffusion film 4, a prism sheet 5, 6, and a protective sheet 7 to provide light in a direction perpendicular to the front of the LCD element. Since many parts, such as the manufacturing process is complicated, there is a problem that takes a lot of manufacturing costs.
고휘도화 및 저비용화를 위해 도광판의 후면에 프리즘을 형성시키는 프리즘 도광판을 사용할 수 있다. 프리즘 도광판은 후면에 미세 피치의 프리즘 패턴이 형성된 도광판으로서, 이를 사용하면 다수의 프리즘 시트 대신 역프리즘 시트 1매만을 사용하여도 종래의 백라이트 유닛보다 높은 휘도를 얻을 수 있다. A prism light guide plate may be used to form a prism on the rear surface of the light guide plate for high brightness and low cost. The prism light guide plate is a light guide plate having a fine pitch prism pattern formed on a rear surface thereof. When the prism light guide plate is used, even if only one inverted prism sheet is used instead of a plurality of prism sheets, the luminance may be higher than that of the conventional backlight unit.
도 2는 종래의 프리즘 도광판을 사용하는 백라이트 유닛의 구조를 도시한 도면이고, 도 3은 종래의 프리즘 도광판을 사용한 백라이트 유닛의 휘도 분포를 나타낸 도면이다.2 is a diagram illustrating a structure of a backlight unit using a conventional prism light guide plate, and FIG. 3 is a diagram illustrating a luminance distribution of a backlight unit using a conventional prism light guide plate.
도 2에 도시된 바와 같이, 백라이트 유닛(10)은 프리즘 도광판(13), 프리즘 도광판(13)의 일측면에 위치한 복수의 점광원(23), 프리즘 도광판(13)의 하면에 배치된 반사판(27)을 포함하여 구성된다. As illustrated in FIG. 2, the backlight unit 10 includes a prism light guide plate 13, a plurality of point light sources 23 disposed on one side of the prism light guide plate 13, and a reflector plate disposed on a bottom surface of the prism light guide plate 13. 27).
점광원(23)으로부터 광이 조사되면, 광은 프리즘 도광판(13)의 측면에 마련된 입광부(13a)로 입사된 뒤에 프리즘 도광판(13) 내부에서 반사되어 프리즘 도광판(13)의 상부 출광부(13b)를 통하여 출사된다. 점광원(23)에서 입광부(13a)로 조사된 빛은 입광부(13a) 근처에 광도가 상대적으로 높아지는 점형태의 광집광부가 발생하고, 프리즘 도광판(13)의 프리즘 패턴(16)에 의하여 이러한 광집광부에 모아진 광이 분광됨으로써 사선 방향으로 휘선이 발생된다(도 3 참고).When light is irradiated from the point light source 23, the light is incident on the light incidence part 13a provided on the side of the prism light guide plate 13, and then reflected inside the prism light guide plate 13, so that the upper light exit part of the prism light guide plate 13 is formed. Exit through 13b). The light irradiated from the point light source 23 to the light incidence portion 13a generates a point-shaped light condensation portion having a relatively high light intensity near the light incidence portion 13a, and is caused by the prism pattern 16 of the prism light guide plate 13. Light collected in such a light condensing unit is spectroscopic, and bright lines are generated in an oblique direction (see FIG. 3).
이러한 문제점을 해결하기 위하여 프리즘을 라운드지게 형성하거나 입광부(13a)에 프리즘 패턴(16)을 적용하고 있으나, 이와 같은 사선 형태의 휘선을 제거하는 데에 한계가 있다. 특히, 측면발광형 백라이트 유닛의 경우 노트북이나 휴대폰에 사용되므로 사선방향의 휘선으로 인하여 프리즘 도광판을 사용할 수 없다는 문제점이 있다. In order to solve this problem, the prism is formed to be rounded or the prism pattern 16 is applied to the light incident portion 13a. However, there is a limit in removing such oblique lines. In particular, since the side light emitting unit is used in a notebook or a mobile phone, there is a problem that the prism light guide plate cannot be used due to the oblique line in the diagonal direction.
따라서, 본 발명의 목적은 도광판의 입광부에서 발생하는 핫스팟(Hot-spot) 및 휘선 발생을 방지하고, 휘도 및 휘도 균일성을 향상시킬 수 있으며, 도광판 상면에 사용되는 광학필름 수를 줄임으로써 백라이트 유닛 제작 시간 및 비용을 줄일 수 있는 광확산 입자를 구비한 도광판을 제공하는데 그 목적이 있다.Accordingly, an object of the present invention is to prevent the occurrence of hot spots and bright lines generated at the light incidence portion of the light guide plate, to improve luminance and brightness uniformity, and to reduce the number of optical films used on the top surface of the light guide plate. It is an object of the present invention to provide a light guide plate having light diffusing particles which can reduce the unit manufacturing time and cost.
상기한 목적을 달성하기 위하여 본 발명의 도광판은 측면 광원으로부터 입사된 빛을 상면으로 출사 가능한 도광판에 있어서, 다수의 광학패턴이 적어도 일면에 형성된 패턴부층이 구비되며, 상기 패턴부층의 광학패턴 내에는 다수의 광확산 입자가 분산되며 상기 패턴부층의 모재와 상기 광확산 입자의 굴절율이 다른 것을 특징으로 한다.In order to achieve the above object, the light guide plate of the present invention includes a pattern part layer having a plurality of optical patterns formed on at least one surface in a light guide plate capable of emitting light incident from a side light source to an upper surface, and in the optical pattern of the pattern part layer. A plurality of light diffusing particles are dispersed and the refractive index of the base material of the pattern portion layer and the light diffusing particles is different.
상기한 목적을 달성하기 위하여 본 발명의 백라이트 유닛은 일 측면에 배치되는 측면 광원, 및 상기 측면 광원으로부터 입사된 빛을 상면으로 출사하는 도광판을 포함하되, 상기 도광판은 다수의 광학패턴이 적어도 일면에 형성된 패턴부층이 구비되며, 상기 패턴부층의 광학패턴 내에는 다수의 광확산 입자가 분산되며 상기 패턴부층의 모재와 상기 광확산 입자의 굴절율이 다른 것을 특징으로 한다.In order to achieve the above object, the backlight unit of the present invention includes a side light source disposed on one side, and a light guide plate for emitting light incident from the side light source to an upper surface, wherein the light guide plate has a plurality of optical patterns on at least one surface thereof. The pattern part layer is formed, and a plurality of light diffusing particles are dispersed in the optical pattern of the pattern part layer, and the refractive indexes of the base material of the pattern part layer and the light diffusing particles are different.
따라서, 본 발명에 따른 백라이트 유닛은 확산 및 집광 효과가 있는 광확산 입자가 코팅된 도광판을 제공함으로써 하부에 다수의 광학패턴이 형성된 도광판을 사용하는 경우 종래의 백라이트 유닛에서 발생되는 휘선 및 핫 스팟(Hot spot) 현상과 같은 외관문제를 개선할 수 있으며, 휘도 균일성을 향상시킬 수 있는 우수한 효과가 있다.Therefore, the backlight unit according to the present invention provides a light guide plate coated with light diffusing particles having diffusion and condensing effects, and thus, when a light guide plate having a plurality of optical patterns formed thereon is used, a bright line and a hot spot generated in a conventional backlight unit ( Appearance problems such as hot spots can be improved, and brightness uniformity can be improved.
또한, 본 발명에 따른 도광판을 사용하면 다수의 프리즘 시트를 사용하는 대신 역프리즘 시트 1매만을 사용하여도 종래의 백라이트 유닛 보다 높은 휘도를 얻을 수 있으며, 그에 따라 백라이트 유닛을 제작하는 시간 및 비용을 절감할 수 있는 효과가 있다.In addition, when the light guide plate according to the present invention is used, instead of using a plurality of prism sheets, only one inverted prism sheet can be used to obtain higher luminance than a conventional backlight unit, thereby reducing the time and cost of manufacturing the backlight unit. There is a saving effect.
도 1은 일반적인 측면형 백라이트 유닛 구조를 도시한 도면이다.1 is a diagram illustrating a general side type backlight unit structure.
도 2는 종래의 프리즘 도광판을 사용하는 백라이트 유닛의 구조를 도시한 도면이다. 2 is a diagram illustrating a structure of a backlight unit using a conventional prism light guide plate.
도 3은 종래의 프리즘 도광판을 사용한 백라이트 유닛의 휘도 분포를 나타낸 도면이다.3 is a diagram illustrating luminance distribution of a backlight unit using a conventional prism light guide plate.
도 4는 본 발명의 제1 실시예에 따른 도광판를 포함하는 백라이트 유닛의 측면도 및 광경로를 도시한 도면이고, 도 5는 본 발명의 제2 실시예에 따른 도광판을 포함하는 백라이트 유닛의 상면도를 도시한 도면이고, 도 6는 본 발명의 제3 실시예에 따른 도광판을 포함하는 백라이트 유닛의 상면도를 도시한 도면이다. 4 is a side view and a light path of a backlight unit including a light guide plate according to a first embodiment of the present invention, Figure 5 is a top view of a backlight unit including a light guide plate according to a second embodiment of the present invention FIG. 6 is a diagram illustrating a top view of a backlight unit including a light guide plate according to a third embodiment of the present invention.
도 7 내지 10는 본 발명의 일실시예에 따른 도광판의 패턴부층에 형성된 광학패턴의 형태를 도시한 도면이다.7 to 10 illustrate the shape of an optical pattern formed on a pattern portion layer of a light guide plate according to an embodiment of the present invention.
도 11는 본 발명의 일실시예에 따른 도광판의 제작방법을 도시한 도면이고, 도 12는 본 발명의 다른 실시예에 따른 도광판의 제작방법을 도시한 것이다.FIG. 11 illustrates a method of manufacturing a light guide plate according to an embodiment of the present invention, and FIG. 12 illustrates a method of manufacturing a light guide plate according to another embodiment of the present invention.
도 13는 본 발명의 일실시예에 따른 도광판에 포함된 광확산 입자의 형태를 도시한 것이고, 도 14는 본 발명의 일실시예에 따른 도광판에 포함된 광확산 입자의 형태에 따른 광확산도를 시뮬레이션한 결과를 도시한 도면이다.FIG. 13 illustrates the shape of light diffusing particles included in the light guide plate according to the exemplary embodiment of the present invention, and FIG. 14 illustrates the light diffusing degree according to the shape of the light diffusing particles included in the light guide plate according to the embodiment of the present invention. It is a figure which shows the result of a simulation.
도 15는 본 발명의 일실시예에 따른 도광판에 포함된 광확산 입자의 형태를 도시한 것이고, 도 16는 본 발명의 일실시예에 따른 도광판에 포함된 광확산 입자의 형태에 따른 광확산도를 시뮬레이션한 결과를 도시한 도면이다.FIG. 15 illustrates the shape of light diffusing particles included in the light guide plate according to the exemplary embodiment of the present invention, and FIG. 16 illustrates the light diffusing degree according to the shape of the light diffusing particles included in the light guide plate according to the embodiment of the present invention. It is a figure which shows the result of a simulation.
도 17는 본 발명에 따른 패턴부층의 광학패턴의 꼭지점까지의 길이를 설명하기 위한 도면이다. 17 is a view for explaining the length to the vertex of the optical pattern of the pattern portion layer according to the present invention.
도 18은 본 발명에 따른 백라이트 유닛의 휘도 균일도 및 평균휘도를 측정하기 위한 도면이다.18 is a diagram for measuring luminance uniformity and average luminance of the backlight unit according to the present invention.
도 19는 일반적인 도광판을 사용하는 백라이트 유닛의 입광부를 도시한 것이고, 도 20는 본 발명에 따른 도광판을 사용하는 백라이트 유닛의 입광부를 도시한 도면이다.19 is a view illustrating a light incident part of a backlight unit using a general light guide plate, and FIG. 20 is a view illustrating a light incident part of a backlight unit using a light guide plate according to the present invention.
이하 도면을 참조하여 본 발명에 따른 도광판 및 백라이트 유닛의 구성을 설명한다. Hereinafter, a configuration of a light guide plate and a backlight unit according to the present invention will be described with reference to the drawings.
도4는 본 발명의 제1 실시예에 따른 도광판를 포함하는 백라이트 유닛의 측면도 및 광경로를 도시한 도면이고, 도5는 본 발명의 제2 실시예에 따른 도광판을 포함하는 백라이트 유닛의 상면도를 도시한 도면이고, 도6는 본 발명의 제3 실시예에 따른 도광판을 포함하는 백라이트 유닛의 상면도를 도시한 도면이다.FIG. 4 is a side view and a light path of the backlight unit including the light guide plate according to the first embodiment of the present invention, and FIG. 5 is a top view of the backlight unit including the light guide plate according to the second embodiment of the present invention. FIG. 6 is a diagram illustrating a top view of a backlight unit including a light guide plate according to a third embodiment of the present invention.
본 발명에 따른 백라이트 유닛(1000)은 도광판(100), 광원(200), 반사판(300)을 포함하여 구성된다. 도광판(100)는 측면 광원(200)으로부터 입사된 빛을 상면으로 출사하며, 다수의 광학패턴이 적어도 일 측면에 형성된 패턴부층(110)이 구비되며, 상기 패턴부층의 광학패턴 내에는 다수의 광확산 입자(120)가 분산된다. The backlight unit 1000 according to the present invention includes a light guide plate 100, a light source 200, and a reflector 300. The light guide plate 100 emits light incident from the side light source 200 to an upper surface, and includes a pattern part layer 110 having a plurality of optical patterns formed on at least one side thereof, and a plurality of lights in the optical pattern of the pattern part layer. Diffusion particles 120 are dispersed.
상기 광확산 입자(120)는 상기 패턴부층(110)에 도포되어 일체화되도록 구비되며, 상기 패턴부층(110)의 모재와 굴절율이 상이한 복수의 광확산 입자(120)가 분산되도록 코팅된다. The light diffusing particles 120 are applied to the pattern part layer 110 so as to be integrated with each other, and the light diffusing particles 120 having a different refractive index from the base material of the pattern part layer 110 are coated to be dispersed.
상기 도광판(100)의 일측에 배치된 광원(200)으로부터 입사된 빛 중에서 일부는 도광판(100)의 상부로 출사되고, 일부는 상기 도광판(100)을 통해 횡방향으로 전달된다. 횡방향으로 전달되는 빛의 일부는 패턴부층(110)에 형성된 광학패턴 또는 광확산 입자(120)에서 굴절되어 상부로 전달되거나, 하부로 전달되어 반사판에서 반사되어 상면으로 전달된다. 상기 도광판(100)의 패턴부층(110)은 도4 및 도5에 도시된 바와 같이, 도광판(100)의 상면 또는 하면에만 형성될 수 있으며, 도6에 도시된 바와 같이, 상면 및 하면에 함께 형성될 수 있고, 상기 상면과 하면에 형성된 패턴부층(110a, 110b)은 서로 평행하게 형성되거나 수직하게 형성될 수 있다. Some of the light incident from the light source 200 disposed on one side of the light guide plate 100 is emitted to the upper part of the light guide plate 100, and a part of the light is transmitted in the transverse direction through the light guide plate 100. A part of the light transmitted in the lateral direction is refracted by the optical pattern or the light diffusing particles 120 formed in the pattern part layer 110 and transmitted to the upper part, or transmitted to the lower part and reflected from the reflecting plate to the upper surface. The pattern portion layer 110 of the light guide plate 100 may be formed only on the top or bottom surface of the light guide plate 100, as shown in FIGS. 4 and 5, and as shown in FIG. The pattern part layers 110a and 110b formed on the upper and lower surfaces may be formed in parallel to each other or vertically.
도7 내지 도 10는 본 발명의 일실시예에 따른 도광판의 패턴부층에 형성된 광학패턴의 형태를 도시한 것으로, 상기 광학패턴은 다각형 패턴(도7, 도8), 상부가 곡면인 다각형 패턴(도 9) 및 원호 패턴(도 10) 등으로 다양하게 형성될 수 있다. 7 to 10 illustrate the shape of an optical pattern formed on a pattern portion layer of a light guide plate according to an embodiment of the present invention, wherein the optical pattern is a polygon pattern (FIGS. 7 and 8) and a polygon pattern having a curved upper surface ( 9) and an arc pattern (FIG. 10) may be variously formed.
도 11는 본 발명의 일실시예에 따른 도광판의 제작방법을 도시한 것이고, 도 12는 본 발명의 다른 실시예에 따른 도광판의 제작방법을 도시한 것이다.11 illustrates a method of manufacturing a light guide plate according to an embodiment of the present invention, and FIG. 12 illustrates a method of manufacturing a light guide plate according to another embodiment of the present invention.
본 발명에 따른 도광판의 제작 방법은 도 11에 도시된 바와 같이, 기재(예를 들어, PET: Poly Ethylene Terephthalate)에 광학패턴(일실시예로 삼각 프리즘 패턴)을 형성(110)한 후 광확산 입자(120)를 분산시키는 방법과, 도 12에 도시된 바와 같이, 기재(110)에 광확산 입자(120)가 포함된 코팅층(예를 들어, 광확산 비드를 포함하는 UV 레진)이 형성된 후 광학패턴을 성형하는 방법이 있다. 상기 코팅층은 미립자인 광확산 입자가 불규칙하게 분포하는 것으로, 광확산 입자가 포함된 코팅액을 도포하여 경화시키는 것에 의해 형성될 수 있으며, 상기 광확산 입자는 투과되는 광을 굴절 또는 투과시키는 것에 의해 광을 균일하게 확산시키게 된다.In the manufacturing method of the light guide plate according to the present invention, as shown in FIG. 11, an optical pattern (in one embodiment, a triangular prism pattern) is formed on a substrate (for example, PET: Poly Ethylene Terephthalate), and then light diffuses. After the particles 120 are dispersed, and as shown in FIG. 12, a coating layer including the light diffusing particles 120 is formed on the substrate 110 (eg, a UV resin including light diffusing beads). There is a method of molding an optical pattern. The coating layer may be formed by irregularly dispersing light diffusing particles, which are fine particles, by coating and curing a coating liquid containing light diffusing particles, and the light diffusing particles may be formed by refracting or transmitting light transmitted therethrough. To diffuse uniformly.
도 13 및 도 15는 본 발명의 일실시예에 따른 도광판에 포함된 광확산 입자의 형태를 도시한 것이고, 도 14 및 도 16는 본 발명의 일실시예에 따른 도광판에 포함된 광확산 입자의 형태에 따른 광확산도를 시뮬레이션한 결과를 도시한 도면이다.13 and 15 illustrate the shape of light diffusing particles included in the light guide plate according to the embodiment of the present invention, and FIGS. 14 and 16 illustrate the light diffusing particles included in the light guide plate according to the embodiment of the present invention. The figure which shows the result of simulating the light diffusivity according to the form.
본 발명에 따른 광확산 입자는 중공이 있는 구형, 중공이 없는 구형, 다각형 형태 등 다양한 형태로 형성될 수 있으며, 광확산 입자의 재료는 유리, 아크릴계, 나일론계, 또는 실리콘계 화합물, 또는 상기 재료를 적어도 하나 포함하는 화합물로 구성될 수 있다. 바람직하게 상기 광확산 입자는 중공을 가지며, 상기 패턴부층보다 작은 굴절율을 갖는 물질로 외피가 제작될 수 있다. 가장 바람직하게, 광확산 입자의 외피는 유리로 제작되고 중공은 진공 상태로 제작되는 글라스 버블로 형성될 수 있다.The light diffusing particles according to the present invention may be formed in various forms such as hollow spheres, hollow spheres, polygonal shapes, and the like, and the material of the light diffusing particles may be glass, acrylic, nylon, or silicon-based compounds, or the materials. It may be composed of a compound containing at least one. Preferably, the light diffusion particles have a hollow, the outer shell may be made of a material having a refractive index smaller than the pattern portion layer. Most preferably, the shell of the light diffusing particles may be formed of glass bubbles made of glass and the hollows produced in vacuum.
도 13에 도시된 실시예를 참고하면, 상기 광확산 입자가 포함된 패턴부층(A)은 굴절율이 1.58인 물질로 형성되고, 상기 광확산 입자(B)는 중공이 없는 구형으로 굴절율이 1.52인 물질로 형성된다. 도 14에 도시된 광확산도를 참고하면, 점광원으로부터 입사된 빛은 굴절율이 상이한 패턴부층과 광확산 입자를 통해 굴절 또는 반사된다. Referring to the embodiment illustrated in FIG. 13, the pattern portion layer A including the light diffusing particles is formed of a material having a refractive index of 1.58, and the light diffusing particles B have a hollow shape and have a refractive index of 1.52. It is formed of a substance. Referring to the light diffusivity shown in FIG. 14, light incident from the point light source is refracted or reflected through the pattern sublayer and the light diffusing particles having different refractive indices.
도 15에 도시된 다른 실시예를 참고하면, 상기 광확산 입자가 포함된 패턴부층(A)은 굴절율이 1.58인 물질로 형성되고, 상기 광확산 입자(B)는 중공이 있는 구형으로 굴절율이 1.52인 물질로 형성되며, 중공 내에는 굴절율이 1.00인 진공 상태로 유지된다. 도 16에 도시된 광확산도를 참조하면, 점광원으로부터 입사된 빛은 굴절율이 상이한 패턴부층과 광확산 입자 표면에서 1차적으로 굴절 또는 반사가 이루어지며, 광확산 비드 내부의 중공으로 전달될 때 2차적으로 굴절 또는 반사가 이루어진다. 따라서, 점광원으로부터 전달된 빛을 균일한 면광원으로 확산시킬 수 있다. Referring to another embodiment illustrated in FIG. 15, the pattern portion layer A including the light diffusing particles is formed of a material having a refractive index of 1.58, and the light diffusing particles B have a hollow sphere with a refractive index of 1.52. It is formed of a phosphorous material and is maintained in a vacuum state with a refractive index of 1.00 in the hollow. Referring to the light diffusivity shown in FIG. 16, light incident from a point light source is primarily refracted or reflected at the surface of the light diffusing particle and the pattern sublayer having different refractive index, and is transmitted to the hollow inside the light diffusing bead. Refraction or reflection is achieved differentially. Therefore, the light transmitted from the point light source can be diffused into a uniform surface light source.
본 발명에 따른 백라이트 유닛은 일 측면에 배치되는 측면 광원, 및 상기 측면 광원으로부터 입사된 빛을 상면으로 출사하는 도광판을 포함하되, 상기 도광판은 다수의 광학패턴이 일 측면에 형성된 패턴부층이 구비되며, 상기 패턴부층의 광학패턴 내에는 다수의 광확산 입자가 분산되며 상기 패턴부층의 모재와 상기 광확산 입자의 굴절율이 다른 것을 특징으로 한다. The backlight unit according to the present invention includes a side light source disposed on one side, and a light guide plate for emitting the light incident from the side light source to the upper surface, the light guide plate is provided with a pattern portion layer formed with a plurality of optical patterns on one side In the optical pattern of the pattern part layer, a plurality of light diffusing particles are dispersed, and the refractive indexes of the base material of the pattern part layer and the light diffusing particles are different.
또한, 상기 백라이트 유닛은 상기 도광판 상부에 배치되며, 상기 도광판에 형성된 다수의 광학패턴의 연장 방향과 수직 방향으로 프리즘이 형성되어 상기 도광판 상부로 확산된 빛을 집광하는 역프리즘 시트를 더 포함할 수 있다.The backlight unit may further include an inverted prism sheet disposed on the light guide plate, the prism being formed in a direction perpendicular to the extension direction of the plurality of optical patterns formed on the light guide plate to collect light diffused on the light guide plate. have.
상기 백라이트 유닛의 휘도는 도광판의 패턴부층에 분산된 광확산 입자의 크기 및 함유량에 따라 결정된다. 즉, 상기 광확산 입자의 크기 및 함유량에 따라 광확산도가 달라질 수 있으며, 이에 따라 혼탁도, 광투과율, 평균휘도, 및 광균일도가 결정된다.The brightness of the backlight unit is determined according to the size and content of the light diffusing particles dispersed in the pattern portion layer of the light guide plate. That is, light diffusivity may vary depending on the size and content of the light diffusing particles, thereby determining turbidity, light transmittance, average luminance, and light uniformity.
본 발명에 따른 도광판의 패턴부층의 광학패턴 내에서의 상기 광확산 입자 함유량이 상기 광확산 입자를 고정하는 코팅층에 대하여 1퍼센트 이상 27퍼센트 이하의 비율로 함유되는 것을 특징으로 한다. 또한, 광확산 입자의 크기는 상기 광확산 입자의 지름 길이 대비 상기 광학패턴의 높이의 비율이 0.5퍼센트 이상 15퍼센트 이하로 형성되는 것을 특징으로 한다. The light-diffusing particle content in the optical pattern of the pattern portion layer of the light guide plate according to the present invention is characterized in that it is contained in a ratio of 1% or more and 27% or less with respect to the coating layer for fixing the light diffuser particles. In addition, the size of the light diffusing particles is characterized in that the ratio of the height of the optical pattern to the diameter length of the light diffusing particles is formed from 0.5% to 15%.
광확산 입자의 함유량, 혼탁도, 및 투과율과의 관계는 [표1]에 나타나 있으며, 백라이트 유닛으로 활용되기 위해서 광투과율이 90% 이상이 되어야 한다. 여기서, 광확산 입자의 함유량은 (광확산 입자의 부피/코팅층의 부피)*100으로 계산된다.The relationship between the content, turbidity, and transmittance of the light diffusing particles is shown in [Table 1], and the light transmittance must be 90% or more to be utilized as a backlight unit. Here, the content of the light diffusing particles is calculated as (volume of the light diffusing particles / volume of the coating layer) * 100.
표 1
Table 1
광확산 입자 함유량 | 혼탁도(Haze) | 투과율 |
0% | 5% | 99% |
1% | 80% | 96% |
3% | 82% | 95% |
5% | 85% | 95% |
7% | 87% | 95% |
9% | 90% | 94% |
11% | 93% | 94% |
13% | 95% | 93% |
15% | 98% | 93% |
17% | 98% | 92% |
19% | 98% | 92% |
21% | 98% | 91% |
23% | 98% | 91% |
25% | 98% | 90% |
27% | 98% | 90% |
29% | 99% | 89% |
31% | 99% | 89% |
33% | 99% | 88% |
Light Diffusion Particle Content | Haze | Transmittance |
0% | 5% | 99% |
One% | 80% | 96% |
3% | 82% | 95% |
5% | 85% | 95% |
7% | 87% | 95% |
9% | 90% | 94% |
11% | 93% | 94% |
13% | 95% | 93% |
15% | 98% | 93% |
17% | 98% | 92% |
19% | 98% | 92% |
21% | 98% | 91% |
23% | 98% | 91% |
25% | 98% | 90% |
27% | 98% | 90% |
29% | 99% | 89% |
31% | 99% | 89% |
33% | 99% | 88% |
따라서, 본 발명에 따른 백라이트 유닛의 광투과율이 90% 이상으로 유지되기 위해서는 상기 광확산 입자의 함유량이 코팅층에 대하여 1퍼센트 이상 27퍼센트 이하의 비율로 함유되는 것이 바람직하다. 즉, 광확산 입자 함유량이 27%를 초과하게 되면 백라이트 유닛의 광투과율이 90% 이하가 되어 휘도 저하 문제가 발생될 수 있으며, 광확산 입자 함유량이 1% 미만일 경우 혼탁도가 80% 미만이 되므로 광을 확산시키는 기능을 충분히 수행할 수 없는 문제가 있다. Therefore, in order for the light transmittance of the backlight unit according to the present invention to be maintained at 90% or more, the content of the light diffusing particles is preferably contained in a ratio of 1% or more and 27% or less with respect to the coating layer. That is, when the light diffusing particle content exceeds 27%, the light transmittance of the backlight unit may be 90% or less, which may cause a problem of deterioration in brightness. When the light diffusing particle content is less than 1%, the turbidity becomes less than 80%. There is a problem that the function of diffusing light cannot be sufficiently performed.
본 발명에 따른 도광판에 포함된 광확산 입자의 크기 대비 패턴부층의 광학패턴의 높이와의 관계는 [표2]와 같으며, 상기 광확산 입자의 크기는 평균휘도 90% 이상이고 광균일도 80% 이상에서 형성되는 것이 바람직하다.The relationship between the size of the light diffusing particles included in the light guide plate according to the present invention and the height of the optical pattern of the pattern part layer is shown in Table 2, and the size of the light diffusing particles is 90% or more in average luminance and 80% in light uniformity. It is preferable to be formed above.
표 2
TABLE 2
광확산입자의 크기 | 평균휘도 | 균일도 |
0% | 100% | 65% |
0.3% | 98% | 70% |
0.5% | 96% | 80% |
1% | 95% | 81% |
3% | 94% | 82% |
5% | 94% | 83% |
7% | 93% | 85% |
9% | 93% | 89% |
11% | 93% | 93% |
13% | 91% | 93% |
15% | 90% | 93% |
17% | 89% | 92% |
19% | 88% | 92% |
Size of Light Diffusion Particles | Average luminance | Uniformity |
0% | 100% | 65% |
0.3% | 98% | 70% |
0.5% | 96% | 80% |
One% | 95% | 81% |
3% | 94% | 82% |
5% | 94% | 83% |
7% | 93% | 85% |
9% | 93% | 89% |
11% | 93% | 93% |
13% | 91% | 93% |
15% | 90% | 93% |
17% | 89% | 92% |
19% | 88% | 92% |
즉, 광확산 입자의 크기(%)는 (광확산 입자의 지름/광학패턴의 높이)*100으로 계산되며, 광학패턴의 높이는 도 17에 도시된 바와 같이, 상기 광학패턴이 삼각 프리즘 패턴인 경우 밑면으로부터 삼각 프리즘 패턴의 꼭지점까지의 길이를 의미하며, 다각형 형태인 경우 광학패턴의 최하위 점으로부터 최상위 점까지의 길이를 의미한다. That is, the size (%) of the light diffusing particles is calculated as (the diameter of the light diffusing particles / the height of the optical pattern) * 100, the height of the optical pattern as shown in Figure 17, when the optical pattern is a triangular prism pattern It means the length from the bottom to the vertex of the triangular prism pattern, in the case of the polygon shape means the length from the lowest point to the highest point of the optical pattern.
상기 평균휘도(%)는 휘도를 측정하는 지점의 휘도값들의 합을 측정 지점의 개수로 나눈값을 퍼센트로 나타낸 것이며, 휘도 균일도(%)는 측정 지점의 휘도값들 중에서 최소 휘도값을 최대 휘도값으로 나눈 값에 100을 곱한 것을 의미한다(도 18 참고).The average luminance (%) represents the sum of the luminance values of the points measuring the luminance divided by the number of measurement points as a percentage, and the luminance uniformity (%) is the minimum luminance value among the luminance values of the measurement points. The value divided by the value is multiplied by 100 (see FIG. 18).
따라서, 본 발명에 따른 백라이트 유닛이 평균휘도 90% 이상, 균일도 80% 이상의 화질 특성을 갖기 위해서 광학패턴 높이 대비 광확산 입자의 지름의 길이가 0.5% 이상 15% 이하로 되는 것이 바람직하다. 즉, 0.5% 미만일 경우에는 균일도가 떨어지며, 15%를 초과하는 경우에는 평균 휘도가 떨어져서 제품의 품질을 만족시키지 못하는 문제가 발생된다. Therefore, in order for the backlight unit according to the present invention to have an image quality characteristic of 90% or more of average luminance and 80% or more of uniformity, the length of the diameter of the light diffusing particles to the height of the optical pattern is preferably 0.5% or more and 15% or less. That is, when less than 0.5%, the uniformity is lowered, and when it exceeds 15%, the average brightness is lowered, which causes a problem that the product quality is not satisfied.
또한, 상기 패턴부층은 어느 일측면으로부터 거리가 멀어질수록 광학패턴이 조밀한 간격으로 형성되어 광확산 효과를 향상시키고, 상기 광확산 입자는 상기 패턴층부의 광학패턴 사이에 배치되는 것을 특징으로 한다. 즉, 반사판 측으로 돌출된 패턴부층의 광학패턴 사이에 형성된 복수의 광확산 입자가 형성되며, 광원으로부터 하부로 전달된 빛을 상부로 확산시키는 기능을 한다.In addition, the pattern portion layer is formed as the optical pattern is densely spaced apart from any one side to improve the light diffusion effect, characterized in that the light diffusion particles are disposed between the optical pattern of the pattern layer portion. . That is, a plurality of light diffusing particles formed between the optical patterns of the pattern portion layer protruding toward the reflecting plate side are formed, and serves to diffuse the light transmitted from the light source to the top.
도 19는 일반적인 프리즘 도광판을 사용하는 백라이트 유닛의 입광부를 도시한 것이고, 도 20는 본 발명에 따른 도광판을 사용하는 백라이트 유닛의 입광부를 도시한 것이다.FIG. 19 illustrates a light incidence part of a backlight unit using a general prism light guide plate, and FIG. 20 illustrates a light incidence part of a backlight unit using a light guide plate according to the present invention.
일반적인 프리즘 도광판을 사용한 백라이트 유닛의 경우 입광부에 사선 모양의 휘선이 발생하여 외관상 문제가 되는 반면, 본 발명에 따른 도광판을 사용하는 백라이트 유닛의 입광부는 균일한 광확산을 관찰 할 수 있다. In the case of a backlight unit using a general prism light guide plate, an oblique line of light is generated in the light incident part, so that the light incident part of the backlight unit using the light guide plate according to the present invention can observe uniform light diffusion.
한편, 본 발명은 전술한 전형적인 바람직한 실시예에만 한정되는 것이 아니라 본 발명의 요지를 벗어나지 않는 범위 내에서 여러 가지로 개량, 변경, 대체 또는 부가하여 실시할 수 있는 것임은 당해 기술분야에서 통상의 지식을 가진 자라면 용이하게 이해할 수 있을 것이다. 이러한 개량, 변경, 대체 또는 부가에 의한 실시가 이하의 첨부된 특허청구범위의 범주에 속하는 것이라면 그 기술사상 역시 본 발명에 속하는 것으로 보아야 한다. On the other hand, the present invention is not limited to the above-described typical preferred embodiment, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions in the art Anyone who has this can easily understand it. If such improvement, change, substitution or addition is carried out within the scope of the appended claims, the technical spirit should also be regarded as belonging to the present invention.
본 발명은 강확산 입자를 가지는 도광판에 관한 것으로, 기존 도광판에서 문제시 되었던 균일한 광분산 및 패턴 비침현상을 개선한 것으로 본 발명의 기술분야에서 유용하게 사용될 수 있는 발명이다. The present invention relates to a light guide plate having strongly diffusing particles, and is an invention that can be usefully used in the technical field of the present invention to improve uniform light scattering and pattern non-incident phenomenon which have been a problem in the conventional light guide plate.
Claims (9)
- 측면 광원으로부터 입사된 빛을 상면으로 출사 가능한 도광판에 있어서, In the light guide plate which can emit the light incident from the side light source to the upper surface,다수의 광학패턴이 적어도 일면에 형성된 패턴부층이 구비되며,A pattern part layer having a plurality of optical patterns formed on at least one surface is provided,상기 패턴부층의 광학패턴 내에는 다수의 광확산 입자가 분산되며 상기 패턴부층의 모재와 상기 광확산 입자의 굴절율이 다른 것을 특징으로 하는 도광판. The light guide plate, characterized in that a plurality of light diffusion particles are dispersed in the optical pattern of the pattern portion layer and the refractive index of the base material of the pattern portion layer and the light diffusion particles are different.
- 제1항에 있어서,The method of claim 1,상기 광확산 입자는 상기 패턴부층의 굴절율보다 작은 굴절율을 갖는 폴리머 또는 글라스로 제작되는 것을 특징으로 하는 도광판.The light diffusing particle is a light guide plate, characterized in that made of a polymer or glass having a refractive index smaller than the refractive index of the pattern portion layer.
- 제1항에 있어서,The method of claim 1,상기 광확산 입자는 중공을 가지며, 상기 광확산 입자는 상기 패턴부층보다 작은 굴절율을 갖는 물질로 외피가 제작되는 것을 특징으로 하는 도광판.The light diffusing particle has a hollow, the light diffusing particle is a light guide plate, characterized in that the outer skin is made of a material having a refractive index smaller than the pattern portion layer.
- 제1항에 있어서,The method of claim 1,상기 패턴부층의 광학패턴 내에서의 광확산 입자의 함유량이 1퍼센트 이상 27퍼센트 이하인 것을 특징으로 하는 도광판.A light guide plate having a content of light diffusing particles in the optical pattern of the pattern portion layer of 1% or more and 27% or less.
- 제1항에 있어서,The method of claim 1,상기 광확산 입자의 크기는 상기 광확산 입자의 지름 길이 대비 상기 광학 패턴 높이의 비율이 0.5퍼센트 이상 15퍼센트 이하로 형성되는 것을 특징으로 하는 도광판.The size of the light diffusing particles is a light guide plate, characterized in that the ratio of the height of the optical pattern to the diameter length of the light diffusing particles is formed from 0.5% to 15%.
- 일 측면에 배치되는 측면 광원; 및A side light source disposed on one side; And상기 측면 광원으로부터 입사된 빛을 상면으로 출사하는 도광판을 포함하되,It includes a light guide plate for emitting the light incident from the side light source to the upper surface,상기 도광판은 다수의 광학패턴이 적어도 일면에 형성된 패턴부층이 구비되며, 상기 패턴부층의 광학패턴 내에는 다수의 광확산 입자가 분산되며 상기 패턴부층의 모재와 상기 광확산 입자의 굴절율이 다른 것을 특징으로 하는 백라이트 유닛. The light guide plate includes a pattern part layer having a plurality of optical patterns formed on at least one surface, and a plurality of light diffusing particles are dispersed in the optical pattern of the pattern part layer, and the refractive index of the base material of the pattern part layer and the light diffusing particles are different. Backlight unit.
- 제6항에 있어서, The method of claim 6,상기 도광판 상부에 배치되며, 상기 도광판에 형성된 다수의 광학패턴이 연장되는 방향과 수직이되도록 다수의 프리즘이 형성되어 상기 도광판의 상부로 확산된 빛을 집광하는 역프리즘 시트를 더 포함하는 것을 특징으로 하는 백라이트 유닛.And an inverted prism sheet disposed on the light guide plate, the plurality of prisms being formed to be perpendicular to a direction in which the plurality of optical patterns formed on the light guide plate extend, to collect light diffused to the upper portion of the light guide plate. Backlight unit.
- 제6항에 있어서, The method of claim 6,상기 광확산 비드는 중공을 가지며, 상기 광확산 비드는 상기 패턴부층보다 작은 굴절율을 갖는 물질로 외피가 제작되는 것을 특징으로 하는 백라이트 유닛.And the light diffusing beads have hollows, and the light diffusing beads are made of a material having a refractive index smaller than that of the pattern portion layer.
- 제8항에 있어서,The method of claim 8,상기 광확산 입자의 상기 패턴부층의 내에서의 함유량이 1퍼센트 이상 27퍼센트 이하이고, 상기 광확산 입자의 크기는 상기 광확산 입자의 지름 길이 대비 상기 광학패턴의 비율이 0.5퍼센트 이상 15퍼센트 이하로 형성되는 것을 특징으로 하는 백라이트 유닛.The content of the light diffusion particles in the pattern portion layer is 1% or more and 27% or less, and the size of the light diffusion particles is such that the ratio of the optical pattern to the diameter length of the light diffusion particles is 0.5% or more and 15% or less. The backlight unit, characterized in that formed.
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KR20080085658A (en) * | 2007-03-20 | 2008-09-24 | 주식회사 코오롱 | Multi-functional optic film |
KR20080099496A (en) * | 2007-05-09 | 2008-11-13 | 엘지전자 주식회사 | Optical sheet, method for manufacturing the optical sheet, backlight unit comprising the optical sheet and liquid crystal display comprising the optical sheet |
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KR20080085658A (en) * | 2007-03-20 | 2008-09-24 | 주식회사 코오롱 | Multi-functional optic film |
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WO2020171506A1 (en) * | 2019-02-20 | 2020-08-27 | Corning Incorporated | Optical structure for light-emitting diode device and light-emitting diode device for lighting application including the same |
CN113491019A (en) * | 2019-02-20 | 2021-10-08 | 康宁股份有限公司 | Optical structure for light emitting diode device and light emitting diode device for lighting application comprising same |
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