WO2016204438A1 - 벤딩 저감이 가능한 집광모듈 및 이를 구비한 백라이트 유닛 - Google Patents
벤딩 저감이 가능한 집광모듈 및 이를 구비한 백라이트 유닛 Download PDFInfo
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- WO2016204438A1 WO2016204438A1 PCT/KR2016/005887 KR2016005887W WO2016204438A1 WO 2016204438 A1 WO2016204438 A1 WO 2016204438A1 KR 2016005887 W KR2016005887 W KR 2016005887W WO 2016204438 A1 WO2016204438 A1 WO 2016204438A1
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- sheet
- light
- reflective polarizing
- polarizing sheet
- shrinkage
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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
- G02B6/005—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
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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
- G02B6/005—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
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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
- G02B6/005—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
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement 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
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
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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
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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
- G02B6/0065—Manufacturing aspects; Material aspects
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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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0085—Means for removing heat created by the light source from the package
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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
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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
- G02F1/133528—Polarisers
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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
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
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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
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133567—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the back side
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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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/54—Arrangements for reducing warping-twist
Definitions
- the present invention relates to a light collecting module capable of reducing bending and a backlight unit having the same, and more particularly, to prevent bending of a reflective polarizing sheet due to a shrinkage difference generated during manufacturing of a reflective polarizing sheet transmitting only light having a specific polarization.
- the present invention relates to a light condensing module capable of reducing bending and a backlight unit having the same.
- liquid crystal display requires a backlight unit that provides uniform light to the entire screen, unlike a conventional CRT.
- the backlight unit is configured to provide uniform light at the rear side of the liquid crystal display, and an LED, which is a light source, is disposed on one side of the light guide plate, and the light guide plate is provided with a reflector on the lower surface thereof, so that the light emitted from the light source is upward. Configured to deliver.
- the light generated by the light source is transmitted upward by the light guide plate and the reflecting plate, and the transmitted light is uniformly transmitted upward through the light collecting sheet.
- a separate reflective polarizing sheet is provided on the top of the light collecting sheet to transmit only the light of a specific polarization to the top to stably transmit the focused light to the outside.
- the light collecting sheet may be applied to a general prism sheet.
- the backlight unit is configured such that the light generated from the light source provided at the side is transferred upward by the light guide plate and the reflective sheet, and the reflected light is uniformly collected through the light collecting sheet.
- the light polarizing sheet is transmitted from the backlight unit as the light is delivered in a uniformly condensed state in the backlight unit, it is used a lot, but in the case of the reflective polarizing sheet due to the long use of the backlight unit, the warpage occurs There is a problem.
- the reflective polarizing sheet is formed by curing a plurality of stacks in an expanded state, and configured to contract again when the temperature rises.
- cooling and curing are performed by using a separate cooling roll, which has different shrinkage rates due to differences in cooling rates of one surface in contact with the cooling roll and one surface that is not.
- the reflective polarizing sheet is bent, and thus there is a problem that the light transmitted from the lower part cannot be evenly transmitted to the outside.
- the technical problem of the present invention is to solve the problems mentioned in the background art, and it is possible to reduce the bending that can reduce the bending caused by the temperature rise of the reflective polarizing sheet due to the shrinkage difference between the reflective polarizing sheet and the light collecting sheet.
- the present invention provides a light collecting module and a backlight unit having the same.
- a plurality of stacks having different refractive indices are stacked to selectively transmit light, and a reflective polarizing sheet having both sides with different shrinkage rates and a cross-sectional area thereof decreasing toward the top.
- the first unit condenser has a first structured pattern that is continuously repeated, wherein the first unit condenser comprises a first condensing sheet bonded to any one surface of the reflective polarizing sheet, the shrinkage ratio of the first condensing sheet and the By the difference in shrinkage of one surface of the reflective polarizing sheet is characterized in that the reflective polarizing sheet shrinks and bends as the temperature rises.
- the reflective polarizing sheet is characterized in that it comprises a cooling surface that is cooled in contact with a separate cooling roll in a heated state and an external exposure surface that is disposed in a stacked form on top of the cooling surface and gradually cooled by exposure to air. can do.
- the first light collecting sheet may be characterized in that the first unit condenser is bonded to the cooling surface, and has a shrinkage ratio that is relatively smaller than the shrinkage of the cooling surface due to the temperature rise.
- the first light collecting sheet may be characterized in that the first unit condenser is bonded to the external exposure surface, and has a shrinkage rate that is relatively greater than the shrinkage of the external exposure surface due to the temperature rise.
- the reflective polarizing sheet may be formed by stacking a plurality of stacks, and the shrinkage may increase from the external exposure surface toward the cooling surface along the stacking direction.
- the first unit condenser is bonded to any one of the cooling surface or the external exposure surface of the reflective polarizing sheet in the upper end portion, characterized in that the shape of the cross section trajectory is deformed by the pressure during the bonding process Can be.
- the reflective polarizing sheet may be cooled in a laminated state through the cooling roll, and may be manufactured in a state in which the cooling surface is bent from the cooling surface toward the external exposure surface by the shape of the cooling roll.
- the reflective polarizing sheet may be formed by curing a plurality of stacks in an expanded state, and may contract again when the temperature rises.
- a separate adhesive layer may be further included between the reflective polarizing sheet and the first light collecting sheet, and a portion of the first unit light collector may be embedded in the adhesive layer.
- the first light collecting sheet may be characterized in that the vertical distance from the bottom end to the top end of the first unit light collecting body is non-uniform.
- the first structured pattern may be repeatedly formed in a form in which the first unit condenser is elongated, and the height of the first structured pattern is changed in the extending direction.
- a light guide plate is provided on one side to transmit the light generated from the light source to the lower side, to be evenly spread on the light guide plate laminated on the light guide plate
- a plurality of optical modules having different refractive indices and a plurality of optical modules including a diffusing sheet and a second condensing sheet coupled to an upper portion of the diffusing sheet and having a second structured pattern in which a second unit condenser having a cross sectional area decreasing toward an upper portion is continuously repeated.
- the stack is stacked to selectively transmit light, and has a reflective polarizing sheet having both sides with different shrinkage rates, and a first structured pattern in which a first unit condenser having a cross-sectional area decreases toward the top thereof is continuously repeated.
- a sieve comprises a first light collecting sheet bonded to any one surface of the reflective polarizing sheet, the second structured pattern Characterized to include a light collecting modules are stacked on top, and reduced to by the shrinkage difference between any surface of the first light collecting sheet shrinkage and the reflective polarizing sheet of the reflective polarizing sheet it is bent by contraction in accordance with temperature rise.
- the reflective polarizing sheet is characterized in that it comprises a cooling surface that is cooled in contact with a separate cooling roll in a heated state and an external exposure surface that is disposed in a stacked form on top of the cooling surface and gradually cooled by exposure to air. can do.
- FIG. 1 is an exploded perspective view schematically showing the configuration of a backlight unit provided with a light collecting module according to the present invention
- FIG. 2 is a view schematically showing the configuration of a light converging module and an optical module in the backlight unit of FIG. 1;
- FIG. 3 is a view showing that the reflective polarizing sheet transmits only a part of light in the backlight unit of FIG. 1;
- FIG. 4 is a view illustrating a state in which a reflective polarizing sheet is bent by a shrinkage difference between a cooling surface and an external exposure surface in the backlight unit of FIG. 1;
- FIG. 5 is a view illustrating a state in which the reflective polarizing sheet of FIG. 4 is manufactured
- FIG. 6 is a view showing that shrinkage occurs due to a temperature increase in a state in which the shrinkage rate of the first light collecting sheet is relatively larger than the shrinkage rate of the cooling surface in a state in which the first light collecting sheet is bonded to the reflective polarizing sheet of FIG. 1;
- FIG. 7 is a view showing that shrinkage occurs due to a temperature increase in a state in which the shrinkage rate of the first light collecting sheet is relatively smaller than the shrinkage rate of the cooling surface when the first light collecting sheet is bonded to the reflective polarizing sheet of FIG. 1;
- FIG. 8 is a view illustrating a state in which a first light collecting sheet is bonded to an external exposure surface in the backlight unit of FIG. 1;
- FIG. 9 is a view showing a state in which a separate adhesive layer is further provided between the reflective polarizing sheet and the first light collecting sheet in the light collecting module of FIG. 1;
- FIG. 10 is a view showing a state in which the vertical height of the first unit condenser is unevenly formed in the condensing module of FIG. 1;
- FIG. 11 is a view illustrating a form in which the heights of the first unit condensers in the condensing module of FIG.
- a backlight unit having a light collecting module will be described with reference to what is applied to a flat panel liquid crystal display device such as an LCD or an LED panel.
- the present invention is not necessarily limited thereto, and may be used alone as an optical sheet, or may be a backlight unit applied to other apparatuses other than the liquid crystal display device, or the characteristics and path of light such as a lighting apparatus. It may be applied to any device that changes the power.
- FIGS. 1 to 5 a schematic configuration of a backlight unit to which a light collecting module according to an embodiment of the present invention is applied is as follows.
- FIG. 1 is an exploded perspective view schematically illustrating a configuration of a backlight unit having a light collecting module according to the present invention
- FIG. 2 is a view schematically illustrating a configuration of a light collecting module and an optical module in the backlight unit of FIG. 1.
- FIG. 3 is a view showing that the reflective polarizing sheet transmits only a part of the light in the backlight unit of FIG. 1
- FIG. 4 is the reflective polarizing sheet bending in the backlight unit of FIG. 1 due to a shrinkage difference between the cooling surface and the external exposure surface.
- 5 is a view illustrating a state in which the reflective polarizing sheet of FIG. 4 is manufactured.
- a backlight unit for providing light to the liquid crystal panel should be provided.
- a backlight unit includes a light source 100, a light guide plate 200, an optical module 300, and a light collecting module 400.
- the light source 100 generally includes a light emitter that emits light, and emits light from the side of the light guide plate 200 to transmit light toward the light guide plate 200.
- the light guide plate 200 transmits the light transmitted from the light source 100 toward the optical module 300.
- the optical module 300 is disposed on the light guide plate 200 to diffuse the light transmitted from the light guide plate 200, and condenses the diffused light again and transfers the light to the top, the diffusion sheet 310 and The second light collecting sheet 320 is included.
- the diffusion sheet 310 is disposed on the light guide plate 200 to diffuse light and to be evenly transferred to the second light collecting sheet 320.
- the diffusion sheet 310 is configured to uniformly diffuse the light transmitted to the upper part through the light guide plate 200 provided at the lower part and to transmit the diffused sheet 310 to the second light collecting sheet 320 positioned at the upper side.
- Non-uniform diffusion patterns are formed in the light diffusion.
- the second light collecting sheet 320 has a second structured pattern 322 that is coupled to the upper portion of the diffusion sheet 310 and the second unit light collecting body 322a of which cross-sectional area decreases toward the top is continuously repeated. .
- the second light collecting sheet 320 largely includes a second base film 324 and a second structured pattern 322.
- a light transmissive film is generally used so that light incident from the lower part can be easily transmitted.
- An upper surface of the second base film 324 is formed such that the second structured pattern 322, which refracts and collects incident light, is integrated with the second base film 324.
- the second structured pattern 322 is continuously repeated on the upper surface of the second base film 324 and the plurality of second unit condensers 322a having an inclined surface which protrudes in an upper direction and has a smaller cross sectional area toward an upper portion thereof. It is composed of
- the second unit light collector 322a refracts and condenses the light transmitted through the second base film 324 and transmits the light to the upper portion.
- the second structured pattern 322 includes a plurality of prismatic shapes formed so that the upper and lower end surfaces of the triangular shape extend in one direction.
- the second unit light collector 322a may be configured in plural and may have the same size and shape.
- the second unit light collectors 322a may have different sizes and inclination angles of inclined surfaces.
- the second unit light collector 322a may have a double inclined surface and may have a polygonal cross-sectional shape along the vertical direction so that each of the second unit light collectors 322a has different inclination angles.
- the second unit light collecting body 322a is formed to extend in one direction along the upper surface of the second light collecting sheet 320, and a plurality of the second light collecting sheets 322a are continuously arranged.
- the optical module 300 is disposed on the diffusion sheet 310 and the diffusion sheet 310 for diffusing the light transmitted through the light guide plate 200 to condense and transmit the diffused light to the upper portion.
- the light condensing module 400 is arranged in a stacked form on the upper portion of the optical module 300 described above and condenses and polarizes the light transmitted from the lower portion and transmits the light uniformly to the upper portion.
- the light collecting sheet 410 and the reflective polarizing sheet 420 are included.
- the reflective polarizing sheet 420 transmits only light having a specific polarization among the light collected and transmitted by the first light collecting sheet 410 to be described later, and reflects the rest to the bottom again. It is stacked on top of the combined.
- a reflective polarizing sheet includes a multilayer stack in which at least two materials are alternately stacked. Since at least one material has the property of tensile stress induced birefringence, the refractive index n of the material is affected by the stretching treatment.
- the refractive index of the material increases in the stretching direction, and part of the light beam is reflected due to the difference in refractive index at each boundary between the two layers.
- Such multilayer stacks can be usefully manufactured as reflective polarizers or mirrors.
- the light directed toward the reflective polarization sheet 420 is light of P1 having polarization of the region transmitted by the reflective polarization sheet 420 as light of different polarizations is mixed. And light of P2 having polarized light in a region that the reflective polarizing sheet 420 does not transmit.
- the light passing through the first light collecting sheet 410 and the second light collecting sheet 320 is a mixed state of P1 and P2, but the reflective polarizing sheet 420 transmits only P1 light and the light of P2 Reflect again in the downward direction.
- the light of P1 is emitted to the outside, but the light of P2 is reflected and returned to the bottom, and is reflected back by the first light collecting sheet 410, the second light collecting sheet 320, the light guide plate 200, and the like to the top again. Move. Through this process, the light of P2 is changed in the polarization state, and through this repetition, the reflective polarizing sheet 420 is converted into a state suitable for transmission.
- the reflective polarizing sheet 420 having the above characteristics has a cooling surface 422 and the cooling surface which are cooled by a separate cooling roll C in a heated state as shown in FIG. 5.
- 422 is disposed on top of the stack 422 and includes an external exposure surface 424 exposed to air and gradually cooled.
- the reflective polarizing sheet 420 is formed by repeatedly stacking a plurality of stacks having different refractive indices, and is cooled while passing through the cooling roll C in a high temperature state.
- the reflective polarizing sheet 420 is laminated and cured in a state where the stack of synthetic resin material is expanded, and gradually shrinks during the cooling process.
- the cooling surface 422 which is rapidly cooled in contact with the cooling roll C, it is hardened in an ecology in which shrinkage is relatively low, and that of the external exposure surface 424 facing the cooling surface 422 is reduced. In the case of being in contact with air is gradually cooled, so harden in a state where a lot of shrinkage occurs.
- the reflective polarizing sheet 420 manufactured as described above is manufactured in the form of a sheet, and on one side thereof, the cooling surface 422 which is rapidly cooled in contact with the cooling roll C and the external exposure surface which is gradually cooled in contact with air ( 424) each.
- the reflective polarizing sheet 420 manufactured through the manufacturing process according to this causes shrinkage when the temperature rises due to external factors, and the shrinkage ratio I1 of the cooling surface 422 is the external exposure surface 424. ) Is larger than the shrinkage (I2).
- the reflective polarizing sheet 420 is formed by curing a plurality of stacks in an expanded state, and configured to contract again when the temperature rises.
- the shrinkage ratio increases from the external exposure surface 424 to the cooling surface 422 along the stacking direction.
- the outer exposed surface 424 is curved to be convex due to the difference in shrinkage ratio I2 between the cooling surface 422 and the external exposed surface 424. Will occur.
- the reflective polarizing sheet 420 is formed to have the cooling surface 422 and the external exposure surface 424 having different shrinkage rates, respectively, and only a part of the light collected and transmitted from the first light collecting sheet 410 is provided. Is selectively transmitted through.
- the first light collecting sheet 410 is configured to have the first structured pattern 412 in which the first unit light collector 412a, the cross-sectional area of which decreases toward the upper portion, is continuously repeated, so that the second light collecting sheet 410 is formed. It is disposed on the upper surface of 320.
- the light condensed by the second light condensing sheet 320 is condensed again to be transmitted to the upper portion.
- the first unit condenser 412a may be formed in the same manner as the second unit condenser 322a described above or may be formed differently.
- the first light collecting sheet 410 includes a first base film 414 and the first structured pattern 412 similar to the second light collecting sheet 320 described above.
- the first structured pattern 412 is disposed under the reflective polarization sheet 420 and is formed on an upper surface of the first base film 414.
- first base film 414 and the second base film 324 may be made of acryl or urethane, and have a high light transmittance so as to transmit light transmitted from the diffusion sheet 310. It is preferably made of a material.
- the first light collecting sheet 410 formed as described above is disposed in a stacked form below the reflective polarizing sheet 420, and at least a part of the first unit light collecting body 412a is the cooling surface 422 or the outside. It is bonded to at least one of the exposed surface 424.
- the first light collecting sheet 410 and the reflective polarizing sheet 420 may maintain an adhesive state.
- the first light collecting sheet 410 shrinks as the temperature of the reflective polarizing sheet 420 increases due to a difference in shrinkage rate I2 between the cooling surface 422 and the external exposure surface 424. It is configured to reduce the bending.
- the first light collecting sheet 410 is configured to be bonded to the cooling surface 422, so that the first light collecting sheet 410 has a shrinkage ratio I1 of the cooling surface 422. It is configured to have a relatively larger shrinkage than).
- the first polarizing sheet 410 shrinks relatively to reduce the bending of the reflective polarizing sheet 420. Can be.
- the reflective polarizing sheet 420 according to the embodiment of the present invention as shown in Figure 5 inevitably the cooling roll (C) in the manufacturing process of cooling in a laminated state using the cooling roll (C) By the shape of the may be manufactured in a state bent from the cooling surface 422 toward the external exposure surface 424.
- the bending degree of the reflective polarizing sheet 420 is insignificant, the bending may occur in the bending direction when the temperature rises and the shrinkage may occur, and thus, according to the shrinkage ratio I3 of the first light collecting sheet 410 The degree to which the reflective polarizing sheet 420 is bent by the temperature rise may be reduced.
- each of the first structured pattern 412 and the second structured pattern 322 is formed to extend in the transverse direction, and the extending direction of the first structured pattern 412 is the first direction.
- the two structured patterns 322 are disposed in a direction intersecting with an extension direction.
- the extending direction of the first structured pattern 412 and the second structured pattern 322 is disposed to vertically intersect.
- the first structured pattern 412 and the second structured pattern 322 may be arranged to be simply crossed.
- the light diffused from the diffusion sheet 310 and transmitted upward may be stably collected through the first unit light collector 412a and the second unit light collector 322a.
- the light collecting module 400 includes the reflective polarizing sheet 420 and the first collecting sheet 410, and the cooling surface 422 and the outside of the reflective polarizing sheet 420. It is comprised so that bending by the shrinkage difference of the exposed surface 424 can be reduced.
- the deflection of the reflective polarization sheet 420 is reduced to enable the display device to be stably used.
- the backlight unit of the present invention configured as described above is stacked and coupled in the order of the light guide plate 200, the optical module 300, and the light condensing module 400, respectively, and stably receives the light generated from the light source 100. Can be diffused and focused.
- the bending of the reflective polarizing sheet 420 is reduced according to the shrinkage ratio I3 of the first light collecting sheet 410 as follows.
- FIG. 6 illustrates a shrinkage rate of the first light collecting sheet 410 rather than a shrinkage rate I1 of the cooling surface 422 in a state in which the first light collecting sheet 410 is bonded to the reflective polarizing sheet 420 of FIG. 1.
- I3 is relatively larger
- the shrinkage is caused by the temperature increase
- FIG. 7 is the state in which the first light collecting sheet 410 is bonded to the reflective polarizing sheet 420 of FIG. 1.
- the shrinkage rate I3 of the first light collecting sheet 410 is smaller than the shrinkage rate I1 of the cooling surface 422.
- the first light collecting sheet 410 is configured to be smaller than or equal to the shrinkage ratio I3.
- the reflective polarizing sheet 420 is configured such that the shrinkage rate I1 of the cooling surface 422 is larger than the shrinkage rate I2 of the external exposure surface 424 as described above.
- the efficiency of the light collecting module 400 is reduced and durability of the backlight unit itself is reduced.
- the first light collecting sheet 410 is bonded to the cooling surface 422 as in the embodiment of the present invention, the first light collecting sheet is smaller than the shrinkage ratio I1 of the cooling surface 422. Shrinkage ratio I3 of 410 is comprised relatively small.
- the cooling surface 422 contracts to bend the portion of the external exposure surface 424 to be convex.
- the shrinkage rate I3 of the first light condensing sheet 410 bonded to the cooling surface 422 is smaller than the shrinkage rate I1 of the cooling surface 422, the shrinkage is relatively less and thus the polarized light is reflected.
- the sheet 420 is supported to reduce bending.
- the shrinkage ratio I3 of the first light collecting sheet 410 is smaller than that of the cooling surface 422.
- the reflective polarizing sheet is controlled by bonding and adjusting the shrinkage ratio of the first condensing sheet to be bonded to the reflective polarizing sheet so as to reduce the warpage generated when the temperature of the reflective polarizing sheet increases due to the difference in shrinkage generated during the manufacture of the reflective polarizing sheet.
- FIG. 8 is a view illustrating a state in which the first light collecting sheet 410 is bonded to the external exposure surface 424 in the backlight unit of FIG. 1.
- the first light collecting sheet 410 may be bonded to the external exposure surface 424 instead of the cooling surface 422.
- the shrinkage of the cooling surface 422 and the first light collecting sheet 410 is not compared, but the shrinkage ratio I3 of the external exposure surface 424 and the first light collecting sheet 410 is compared. Therefore, the shrinkage ratio I3 of the first light collecting sheet 410 is configured to be relatively larger.
- shrinkage rate of the external exposure surface 424 is smaller than that of the cooling surface 422
- shrinkage occurs when the temperature of the reflective polarizing sheet 420 rises, and convex downwards due to a difference in shrinkage rate. Warping occurs to dissolve.
- the reflective polarizing sheet 420 is reversed. Pulling in the direction can reduce the overall warpage.
- the shrinkage rate I3 of the first light collecting sheet 410 is relative to the shrinkage rate I2 of the external exposure surface 424.
- the shrinkage rate I3 of the first light collecting sheet 410 is the shrinkage rate of the cooling surface 422. It is preferable to comprise so that it may become comparatively smaller than (I1).
- the first light collecting sheet 410 when the first light collecting sheet 410 is bonded to the cooling surface 422, the first light collecting sheet 410 is configured to have a shrinkage smaller than that of the cooling surface 422, and the first light collecting sheet 410 is the external exposure surface.
- the reflective polarizing sheet 420 When bonded to 424, the reflective polarizing sheet 420 may be reduced in temperature due to a higher shrinkage ratio than the external exposed surface 424.
- a separate adhesive layer 430 is further provided between the reflective polarizing sheet 420 and the first light collecting sheet 410 as follows.
- FIG. 9 is a view showing a state in which the adhesive layer 430 is further provided between the reflective polarizing sheet 420 and the first light collecting sheet 410 in the light collecting module 400 of FIG. 1.
- the light condensing module 400 is the lamination of the reflective polarizing sheet 420 and the first condensing sheet 410 in a stacked form, and the adhesive layer 430 is formed on the lower surface of the reflective polarizing sheet 420. ) Is further included.
- the adhesive layer 430 may be applied to a part or the whole of the lower surface of the reflective polarizing sheet 420 and may have a uniform thickness or a non-uniform thickness.
- the adhesive layer 430 is provided on a lower surface of the cooling surface 422, and an upper end of the first structured pattern 412 formed on the first light collecting sheet 410 is inside the adhesive layer 430. Is reclaimed.
- the adhesion area between the first light collecting sheet 410 and the reflective polarizing sheet 420 is increased, thereby increasing the adhesive strength, and thus the first light collecting sheet 410 is more stably provided by the reflective polarizing sheet 420.
- By supporting the bending of the can be reduced stably.
- the reflective polarizing sheet is coated by applying the adhesive layer 430 having a shrinkage ratio relatively smaller than the shrinkage rate I1 of the cooling surface 422.
- the warpage of 420 may be more stably supported.
- the shrinkage of the adhesive layer 430 is larger than that of the external exposure surface 424. It is preferable to use.
- FIG. 10 is a view illustrating a state in which the vertical height of the first unit condenser 412a is unevenly formed in the condensing module 400 of FIG. 1, and FIG. 11 is the first condensing module 400 of FIG. 1. It is a figure which shows the form which each height changes in the federal direction of the one-unit light collector 412a.
- a plurality of first unit light collectors 412a are spaced apart from each other along an upper surface of the first base film 414.
- each of the plurality of first unit light collectors 412a is formed to extend along an upper surface of the first base film 414 and is spaced apart from each other.
- the plurality of first unit light collectors 412a have a non-uniform vertical distance from the lowermost part to the uppermost part.
- the plurality of first unit condensers 412a may be configured to have non-uniform vertical heights, such that the first base film 414 and the reflective polarizing sheet 420 are bonded to each other. Only a part of the unit light collector 412a is bonded to the bottom surface of the reflective polarizing sheet 420.
- the reflective polarization sheet 420 and the first base film 414 may be contracted or expanded. It is possible to maintain the bonded state without generating the sheet 420.
- the first unit condenser 412a is deformed on an upper surface of the first base film 414, and a plurality of the first unit condensers 412a are formed on the first base film 414. It is formed to extend along the upper surface of the base film 414, each of which is repeatedly arranged along the transverse direction.
- the plurality of first unit light collectors 412a are formed to have a nonuniform height along the extending direction, so that only a part of the first unit light collectors 412a are bonded to the bottom surface of the reflective polarizing sheet 420.
- the plurality of first unit condensers 412a have a predetermined pattern and are uniformly spaced apart from each other, and each of the first unit condensers 412a is formed to have a non-uniform height along the extending direction. Only one portion of the first unit light collector 412a is bonded to the bottom surface of the reflective polarizing sheet 420.
- each of the first unit light collectors 412a may be changed with a constant period P, but the height may be changed irregularly along the extension direction.
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Abstract
Description
Claims (13)
- 굴절률이 서로 다른 복수 개의 스택이 적층되어 빛을 선택적으로 투과시키며, 수축률이 상이한 양면을 갖는 반사편광시트; 및상부로 갈수록 횡단면적이 감소하는 제1단위집광체가 연속적으로 반복되는 제1구조화패턴을 가지며, 상기 제1단위집광체가 상기 반사편광시트의 어느 일면에 접합되는 제1집광시트; 를 포함하며,상기 제1집광시트의 수축률과 상기 반사편광시트의 어느 일면의 수축률 차이에 의해 상기 반사편광시트가 온도 상승에 따라 수축하여 휘어지는 것을 저감시키는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제1항에 있어서,상기 반사편광시트는,가열된 상태에서 별도의 냉각롤에 접촉하여 냉각되는 냉각면; 및상기 냉각면의 상부에서 적층 형태로 배치되며 공기에 노출되어 서서히 냉각되는 외부노출면을 포함하는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제2항에 있어서,상기 제1집광시트는,상기 냉각면에 상기 제1단위집광체가 접합되며, 온도 상승에 의한 상기 냉각면의 수축률보다 상대적으로 더 작은 수축률을 가지는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제2항에 있어서,상기 제1집광시트는,상기 외부노출면에 상기 제1단위집광체가 접합되며, 온도 상승에 의한 상기 외부노출면의 수축률보다 상대적으로 큰 수축률을 가지는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제2항에 있어서,상기 반사편광시트는,복수 개의 스택이 적층되어 형성되며, 상기 외부노출면에서 적층방향을 따라 상기 냉각면으로 갈수록 수축률이 증가하는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제2항에 있어서,상기 제1단위집광체는,상부방향 끝단부가 상기 반사편광시트의 상기 냉각면 또는 상기 외부노출면 중 어느 하나에 접합되며, 접합과정에서 압력에 의해 단면 궤적의 형상이 변형되는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제2항에 있어서,상기 반사편광시트는,상기 냉각롤을 통해 적층상태로 냉각되며 상기 냉각롤의 형상에 의해 상기 냉각면에서 상기 외부노출면 방향으로 벤딩된 상태로 제조되는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제1항에 있어서,상기 반사편광시트는,복수 개의 스택이 팽창된 상태로 경화되어 형성되며, 온도가 상승하면 다시 수축하는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제1항에 있어서,상기 반사편광시트와 상기 제1집광시트 사이에 별도의 접착층이 더 포함되며, 상기 제1단위집광체의 일부가 상기 접착층 내부로 매립되는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제1항에 있어서,상기 제1집광시트는,상기 제1단위집광체의 최하단부에서 최상단부에 이르는 수직거리가 불균일하게 구성되는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 제1항에 있어서,상기 제1구조화패턴은,상기 제1단위집광체가 길게 연장된 형태로 반복하여 형성되며 연장방향을 따라 높이가 변화되는 것을 특징으로 하는 벤딩 저감이 가능한 집광모듈.
- 일측에 광원이 구비되어 상기 광원으로부터 발생되는 빛을 하부로 전달하는 도광판;상기 도광판의 상부에 적층되어 하부로부터 전달되는 빛을 고르게 확산시키는 확산시트 및 상기 확산시트의 상부에 결합되며 상부로 갈수록 횡단면적이 감소하는 제2단위집광체가 연속적으로 반복되는 제2구조화패턴을 가지는 제2집광시트를 포함하는 광학모듈; 및굴절률이 서로 다른 복수 개의 스택이 적층되어 빛을 선택적으로 투과시키며, 수축률이 상이한 양면을 갖는 반사편광시트 및 상부로 갈수록 횡단면적이 감소하는 제1단위집광체가 연속적으로 반복되는 제1구조화패턴을 가지며, 상기 제1단위집광체가 상기 반사편광시트의 어느 일면에 접합되는 제1집광시트를 포함하며, 상기 제2구조화패턴의 상부에 적층되는 집광모듈; 을 포함하고,상기 제1집광시트의 수축률과 상기 반사편광시트의 어느 일면의 수축률 차이에 의해 상기 반사편광시트가 온도 상승에 따라 수축하여 휘어지는 것을 저감시키는 것을 특징으로 하는 백라이트 유닛.
- 제12항에 있어서,상기 반사편광시트는,가열된 상태에서 별도의 냉각롤에 접촉하여 냉각되는 냉각면; 및상기 냉각면의 상부에서 적층 형태로 배치되며 공기에 노출되어 서서히 냉각되는 외부노출면을 포함하는 것을 특징으로 하는 백라이트 유닛.
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JP2017565118A JP6561293B2 (ja) | 2015-06-17 | 2016-06-03 | ベンディングの低減が可能な集光モジュール及びこれを備えたバックライトユニット |
US15/737,215 US10302843B2 (en) | 2015-06-17 | 2016-06-03 | Light concentrating module capable of reducing bending, and backlight unit comprising same |
CN201680034856.8A CN107820583B (zh) | 2015-06-17 | 2016-06-03 | 能减小弯曲的聚光模块及具备其的背光单元 |
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KR1020150085709A KR101733627B1 (ko) | 2015-06-17 | 2015-06-17 | 벤딩 저감이 가능한 집광모듈 및 이를 구비한 백라이트 유닛 |
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KR102205118B1 (ko) * | 2019-08-27 | 2021-01-20 | 주식회사 엘엠에스 | 더스트 커버필름 및 이를 구비한 헤드업 디스플레이 장치 |
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- 2016-06-03 WO PCT/KR2016/005887 patent/WO2016204438A1/ko active Application Filing
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- 2016-06-03 JP JP2017565118A patent/JP6561293B2/ja active Active
- 2016-06-03 CN CN201680034856.8A patent/CN107820583B/zh active Active
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JP2018521472A (ja) | 2018-08-02 |
JP6561293B2 (ja) | 2019-08-21 |
US20180172891A1 (en) | 2018-06-21 |
KR20160148915A (ko) | 2016-12-27 |
CN107820583A (zh) | 2018-03-20 |
KR101733627B1 (ko) | 2017-05-10 |
US10302843B2 (en) | 2019-05-28 |
CN107820583B (zh) | 2021-07-20 |
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