WO2016186410A1 - 파티클이 구비된 반사편광모듈 및 이를 구비한 백라이트 유닛 - Google Patents
파티클이 구비된 반사편광모듈 및 이를 구비한 백라이트 유닛 Download PDFInfo
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- WO2016186410A1 WO2016186410A1 PCT/KR2016/005156 KR2016005156W WO2016186410A1 WO 2016186410 A1 WO2016186410 A1 WO 2016186410A1 KR 2016005156 W KR2016005156 W KR 2016005156W WO 2016186410 A1 WO2016186410 A1 WO 2016186410A1
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- Prior art keywords
- light
- reflective polarizing
- sheet
- polarizing sheet
- reflective
- Prior art date
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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
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
Definitions
- the present invention relates to a reflective polarizing module having a separate particle and a backlight unit having the same. More specifically, the light is collected by a coating layer provided with a separate particle in a reflective polarizing sheet for transmitting only light having a specific polarization.
- the present invention relates to a reflective polarization module for diffusing light 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 bottom surface, so that the light emitted from the light source is upward. It is configured to deliver.
- the light generated by the light source in the state configured as described above is transmitted to the upper portion by the light guide plate and the reflecting plate, and the transmitted light passes through the condensing sheet again and uniformly moves upward.
- the light collecting sheet may be a sheet on which a general prism is formed.
- the luminance of the liquid crystal display may be increased.
- 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 reflecting plate, and the transmitted light is uniformly collected through the light collecting sheet.
- the reflective polarizing sheet is provided in the backlight unit, since the luminance of the LCD may be increased, the upper end of the prism having the inclined surface when the condensing sheet having the plurality of prisms and the reflective polarizing sheet is bonded is used. It forms a bonding surface and disappears.
- the upper end of the prism is lost, and the bonding surface is formed to form a bonding surface with the reflective polarizing sheet, whereby the reflective polarizing sheet and the light collecting sheet can be stably maintained.
- the surface of the bonding surface is visually recognized or a color shift phenomenon occurs due to optical interference of the reflective polarizing sheet composed of multilayer thin films.
- the problem of deterioration of the screen quality occurs, and an unintended moiré phenomenon caused by optical interference with the liquid crystal panel occurs.
- the technical problem of the present invention is to solve the problems mentioned in the background art, and includes a separate coating layer provided with particles on the reflective polarizing sheet to diffuse light transmitted through the reflective polarizing sheet to generate a bonding line with the prism.
- the present invention provides a reflective polarizing module including particles and a backlight unit having the same, which prevents moiré phenomenon caused by a bonding line.
- the reflective polarization module a plurality of layers having different refractive indices are stacked to selectively transmit light, the polarizing sheet, the cross-sectional area is reduced toward the top
- a first condensing sheet having a first structured pattern in which one unit condenser is continuously repeated, and a first condensing sheet and the reflection of which an upper end portion of the first unit condenser has a first width in a transverse direction from a lower portion of the reflective polarizing sheet;
- Located on the upper surface of the polarizing sheet and comprises a coating layer having a plurality of particles for diffusing the light transmitted through the reflective polarizing sheet, at least some of the plurality of particles are formed relatively smaller in diameter than the first width It is characterized by.
- the coating layer may be characterized in that a plurality of diffusion patterns protruding from the upper surface is formed to diffuse the light transmitted through the reflective polarizing sheet.
- the diffusion pattern may be formed non-uniformly, the width along each transverse direction may be formed to be relatively smaller than the first width.
- the display device may further include an adhesive layer positioned on a lower surface of the reflective polarizing sheet and buried and bonded to have an upper end portion of the first unit condenser having a boundary surface corresponding to a second width in a transverse direction, and at least a portion of the plurality of particles. It may be characterized in that the diameter is formed relatively smaller than the second width.
- the adhesive layer may have a plurality of non-uniform bonding patterns and may be positioned on a lower surface of the reflective polarizing sheet.
- the diameter in the transverse direction of the bonding pattern formed on the adhesive layer may be characterized in that it is formed relatively smaller than the second width.
- the adhesive layer may be characterized in that a plurality of the particles are provided therein.
- the particles may be made of a material having a different refractive index than the coating layer.
- the first structured pattern may be characterized in that the vertical distance from the lowermost part to the uppermost part of each of the first unit condensers on the vertical cross section is non-uniform.
- the first structured pattern may be repeatedly formed in a form in which the first unit condenser is elongated and its height is changed in the extending direction.
- the backlight unit for solving the above problems, the light guide plate which is provided with a light source on one side to transfer the light generated from the light source, laminated on the lower surface of the light guide plate and transmitted through the light guide plate
- a reflector plate for reflecting light upwards, a diffusion sheet stacked on top of the light guide plate to diffuse light evenly from the bottom, and a second unit condenser coupled to an upper portion of the diffusion sheet, the cross-sectional area of which decreases toward the top thereof, continuously
- An optical module including a second light collecting sheet having a second structured pattern repeated as a plurality of layers and a reflective polarizing sheet for selectively transmitting light by stacking a plurality of layers having different refractive indices, and crossing from a lower portion of the reflective polarizing sheet to an upper portion thereof
- the first unit condenser having a reduced area has a first structured pattern that is repeated continuously, An upper end of the first unit condenser is disposed on an upper surface of the first condensing
- the reflective polarizing sheet is diffused by providing a coating layer having particles on the upper surface of the reflective polarizing sheet, the moiré phenomenon generated by a periodic pattern formed by the bonding surface of the reflective polarizing sheet and the light collecting sheet is eliminated. There is an advantage that can be reduced.
- a coating layer having particles is provided on the reflective polarizing sheet, and the light is diffused by the particles, so that the ends of the structured patterns formed on the reflective polarizing sheet and the light collecting sheet are lost to reduce the light collection efficiency due to the bonding surface. There is an advantage that can be minimized.
- FIG. 1 is an exploded perspective view schematically showing the configuration of a backlight unit equipped with a reflective polarization module according to the present invention
- FIG. 2 is a view schematically illustrating the configuration of a reflective polarization module and an optical module in the backlight unit of FIG. 1;
- FIG. 3 is a view showing that the reflective polarizing sheet transmits and reflects incident light in the backlight unit of FIG. 1;
- FIG. 4 is a view illustrating a state in which a particle inside a coating layer is formed to be relatively smaller than a first width of a first unit light collector in the reflective polarizing sheet of FIG. 1;
- FIG. 5 is a view illustrating a state in which a separate diffusion pattern is formed on a coating layer in the reflective polarization module of FIG. 1;
- FIG. 6 is a view illustrating a separate adhesive layer formed on a bottom surface of a reflective polarizing sheet in the backlight unit of FIG. 1;
- FIG. 7 is a side view of the reflective polarization module of FIG. 6;
- FIG. 8 is a view illustrating a state in which a separate bonding pattern is formed on an adhesive layer formed on a lower surface of the reflective polarizing sheet of FIG. 6;
- FIG. 9 is a view illustrating a state in which the vertical heights of the first unit light collectors are irregularly formed in the reflective polarization module of FIG. 1;
- FIG. 10 is a view illustrating a form in which the heights of the first unit light collectors in the reflective polarization module of FIG. 1 change according to the federal direction.
- a backlight unit having a reflective polarization module according to an embodiment of the present invention will be described by taking an example that 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 paths of light such as lighting fixtures may be Any device that changes can be applied.
- FIGS. 1 to 4 a schematic configuration of a backlight unit to which a reflective polarization module according to an embodiment of the present invention is applied will be described with reference to FIGS. 1 to 4.
- FIG. 1 is an exploded perspective view schematically illustrating a configuration of a backlight unit having a reflective polarization module according to the present invention
- FIG. 2 is a view schematically illustrating a configuration of a reflective polarization module and an optical module in the backlight unit of FIG. 1.
- FIG. 3 is a view showing that the reflective polarizing sheet transmits and reflects the incident light in the backlight unit of FIG. 1
- FIG. 4 is a first width of the first unit condenser having particles inside the coating layer in the reflective polarizing sheet of FIG. 1. It is a figure which shows the state formed relatively smaller.
- a backlight unit for providing light to the liquid crystal panel.
- a backlight unit includes a light source 100, a light guide plate 200, a reflective plate 500, an optical module 300, and a reflective polarization module 400.
- the light source 100 generally generates light at the side of the light guide plate 200 and transmits light to the light guide plate 200.
- a light emitting diode (LED) and a cold cathode fluorescent lamp (CCFL) may be selectively used.
- the light incident on the light guide plate 200 proceeds with total reflection inside the light guide plate 200, and the light incident on the surface of the light guide plate 200 is transmitted at the angle of incidence smaller than the critical angle without being totally reflected. Is released.
- the reflector 500 reflects the light emitted downward and re-enters the light guide plate 200 to improve light efficiency. Through this process, the light guide plate 200 transmits the incident light toward the optical module 300.
- the optical module 300 is disposed on the light guide plate 200 to diffuse light transmitted from the light guide plate 200, and condense the diffused light again to transfer the light to the top.
- 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 evenly spreads the light transmitted to the upper part through the light guide plate 200 and the reflecting plate 500 provided at the lower part and transmits the light to the second light collecting sheet 320 positioned at the upper part.
- a nonuniform diffusion pattern is formed on the upper or lower surface to diffuse the light.
- 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 to easily transmit light incident from the bottom.
- 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 to diffuse the light transmitted through the light guide plate 200 and the reflective plate 500 to diffuse the light.
- the optical module 300 Including the second condensing sheet 320 to condense and transmit to the upper side, the light transmitted from the lower side condenses and transmits to the upper side.
- the reflective polarization module 400 is arranged in a stacked form in the upper portion of the above-described optical module 300 and condenses and polarizes the light transmitted from the bottom to transmit the light uniformly, in the present invention,
- the reflective polarizing sheet 420, the first light collecting sheet 410, and the coating layer 430 are largely included.
- the reflective polarizing sheet 420 transmits only light having a specific polarization among the light collected and transmitted by the optical module 300 and reflects the rest back to the bottom, and is stacked on the optical module 300. Are combined.
- the reflective polarizing sheet 420 may operate as a reflective polarizer or a mirror reflecting light of a specific polarization in a stack composed of multiple layers. It can also function as a wavelength selective reflector, such as a 'cold mirror' that reflects visible light and passes infrared light or a 'hot mirror' that passes visible light and reflects infrared light.
- the reflective polarizing sheet 420 as used in the present invention has a high reflectance not only for normal light but also for an off angle, and shows a low absorption rate for incident light. This property typically determines whether the reflective polarizing sheet 420 is used for simple reflection or reflective polarization of light.
- the reflective polarizing sheet 420 is formed by stacking tens, hundreds, or thousands of layers of different high refractive index films and low refractive index films.
- the reflective polarizing sheet 420 has a state in which the light directed toward the reflective polarizing sheet 420 is mixed with light of different polarizations as shown in FIG. 3. It consists of the light of P1 which has the polarization of the area
- 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 lower side, and again, the first light collecting sheet 410, the second light collecting sheet 320, the light guide plate 200, the reflecting plate 500, and the like. Is reflected back to the top.
- the light of P2 is changed in the polarization state, and through this repetition, the light of the polarization sheet 420 is converted into the polarization state suitable for transmission.
- the coating layer 430 according to the present invention is located on the upper surface of the reflective polarizing sheet 420 is configured to diffuse the light transmitted through the reflective polarizing sheet 420, the plurality of particles ( 432).
- the particle 432 is formed in various forms and is made of a material different from the coating layer 430 is configured to diffuse the light transmitted through the reflective polarizing sheet 420.
- the particle 432 is composed of a plurality is included in the coating layer 430, it is disposed unevenly within the coating layer 430.
- the particle 432 is configured to have a different material or different refractive index than the coating layer 430.
- the light transmitted through the reflective polarizing sheet 420 is stably diffused.
- the particle 432 is formed in a spherical shape is configured to diffuse the light transmitted through the reflective polarizing sheet 420 by reflecting or refracting the light at various angles.
- the particles 432 are not spherical, but may be formed in various forms of polygons or asymmetrical shapes.
- 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 the sheet 320.
- the second light collecting sheet 320 is configured to condense and transmit the light transmitted from the second light collecting sheet 320 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 the 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.
- 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 portion of the first unit light collecting body 412a is bonded to the reflective polarizing sheet 420. do.
- the first light collecting sheet 410 and the reflective polarizing sheet 420 are stably bonded while maintaining an adhesive state.
- 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 may be stably collected through the first unit light collector 412a and the second unit light collector 322a.
- the first light collecting sheet 410 is bonded so that the upper end portion of the first structured pattern 412 has a first width in the transverse direction at the bottom of the reflective polarizing sheet 420.
- the first unit light collector 412a is bonded to the lower surface of the reflective polarizing sheet 420, and a part of the upper end portion is lost and bonded when the bonding is performed.
- the width along the transverse direction of the missing upper end of the first unit light collector 412a is configured to have a first width.
- the first unit light collector 412a is bonded to the lower surface of the reflective polarizing sheet 420 and then bonded so that the lateral length of the bonded portion is the first width.
- the first unit light collector 412a is directly bonded to the lower surface of the reflective polarizing sheet 420 as shown, and the upper end portion of the first unit light collector 412a is lost and serves as an adhesive. At this time, the first width of the portion bonded to the lower surface of the reflective polarizing sheet 420 is L1.
- the particle 432 provided inside the coating layer 430 described above is configured to have a diameter of at least some of the plurality of particles relatively smaller than the first width.
- the maximum diameter of the particle 432 is L2, which is relatively smaller than the first width L1.
- the particle 432 may be a result of diffusion particles such as beads diffused into the polymer resin, and a part of the diffusion particles may be embedded in the polymer resin, and only the remaining parts may be exposed.
- the maximum diameter of the particle 432 is configured to be smaller than the first width L1. Accordingly, light passing through the first unit light collector 412a and transmitted to the reflective polarizing sheet 420. It is possible to prevent the luminance from being lowered by refracting upward from the particle 432.
- the angle of the light refracted by the first unit light collector 412a is refracted by the particle 432 at a larger angle.
- the light is refracted to the side rather than the center.
- the luminance of the light passing through the coating layer 430 is reduced overall.
- the maximum diameter L2 of the particle 432 is formed to be smaller than the first width L1, so that the light refracted and transmitted from the first unit light collector 412a is transmitted to the particle 432. The light is diffused upwards.
- the light passing through the coating layer 430 by the particles 432 minimizes the decrease in luminance and at the same time, internal diffusion occurs to bond the first unit light collector 412a to the reflective polarizing sheet 420. It is possible to prevent quality deterioration such as moiré phenomenon caused by cotton.
- the coating layer 430 is formed on the upper surface of the reflective polarizing sheet 420 having a plurality of the particles 432, the diameter of the particle 432 is formed relatively smaller than the first width, thereby The light passing through the coating layer 432 may be prevented from being diffused to the side other than the center to prevent the luminance from being reduced.
- the backlight unit of the present invention configured as described above is stacked and coupled in the order of the reflecting plate 500, the light guide plate 200, the optical module 300 and the reflective polarization module 400, respectively, the light source 100
- the light generated from the light may be stably diffused and collected and transmitted, and the light passing through the reflective polarizing sheet 420 may be diffused to the center by the particles 432.
- the particles 432 are provided in the coating layer 430, the light passing through the first light collecting sheet 410 and the reflective polarizing sheet 420 is diffused at a predetermined angle, such as a bonding line. To shield defects that are problematic for quality deterioration.
- the first light collecting sheet 410 and the reflective polarizing sheet 420 are bonded to each other, a portion of the upper end portion of the first unit light collecting body 412a is lost, and thus an inclined surface refracting light transmitted from the lower portion. The part where light is not condensed by the absence of the is generated.
- the first light collecting sheet ( The particle 432 together with the 410 may focus and diffuse the light transmitted from the bottom at a predetermined angle.
- the coating layer It is diffused by the particles 432 provided in the 430 can be prevented from decreasing the brightness.
- the light passing through the coating layer 432 may be prevented from being diffused to a side other than the center to prevent the luminance from being reduced.
- the diameter of the particle 432 of the largest size among the plurality of particles 432 is preferably smaller than the first width. Accordingly, the first unit light collector 412a and Through the reflective polarizing sheet 420, light may be stably diffused so that shadows due to the bonding surface do not occur.
- the diameter of the particle 432 is smaller than the first width, so that at least one or more of the particles 432 are disposed on an upper surface of the bonding surface of the first unit light collector 412a and the reflective polarizing sheet 420. This is arranged, whereby light can be stably diffused.
- the diameter of the particle 432 is formed to be relatively smaller than the first width and at the same time may have a variety of sizes in the coating layer 430, when manufacturing the coating layer 430 to adjust the size of the brightness You can also adjust.
- the coating layer 430 is provided with the particles 432 and has a diameter relatively smaller than the first width, whereby the bonding surface of the first light collecting sheet 410 and the reflective polarizing sheet 420 is formed. It is possible to diffuse the light that has not been collected. Accordingly, the light passing through the first light collecting sheet 410 and the reflective polarizing sheet 420 is diffused at a predetermined angle so that a moire phenomenon or color occurs in the liquid crystal display device. A shift phenomenon can be prevented from occurring.
- the coating layer 430 having the particles 432 is provided on the reflective polarizing sheet 420, the light is diffused by the particles 432, the reflective polarizing sheet 420 and the first light collecting sheet 410 An end portion of the first structured pattern 412 formed at the end of the bonding layer may be lost, thereby reducing the reduction of light collection efficiency due to the bonding surface.
- FIG. 5 is a view illustrating a state in which the diffusion pattern 434 is formed on the coating layer 430 in the reflective polarization module 400 of FIG. 1.
- a separate diffusion pattern 434 is further formed on the coating layer 430 provided with the particles 432 on the upper surface of the reflective polarizing sheet 420.
- the diffusion pattern 434 is formed to protrude on the upper surface of the coating layer 430 is composed of a plurality, it is configured to have a non-uniform pattern.
- the diffusion pattern 434 is formed as a general spherical protrusion as shown, and is irregularly arranged on the top surface of the coating layer 430. At this time, the size of the diffusion pattern 434 is not uniform and has a non-uniform size, the width along each transverse direction is formed relatively smaller than the first width described above.
- the particles 432 transmit light transmitted through the reflective polarizing sheet 420 without being collected by the first light collecting sheet 410. Can be spread together.
- the first structured pattern 412 and the reflective polarizing sheet 420 are formed by forming a maximum size L3 in the transverse direction of the diffusion pattern 434 formed in the shape of a protrusion relatively smaller than the first width L1. It is possible to diffuse the light transmitted without being focused through the bonding surface generated by the adhesion of the lower surface.
- the diffusion pattern 434 may be formed by a method of replicating using a master, or may be formed using a separate processing roll.
- the adhesive layer 440 is further included in the reflective polarization module 400 according to the present invention with reference to FIGS. 6 to 8.
- FIG. 6 is a view illustrating a state in which the adhesive layer 440 is formed on a lower surface of the reflective polarizing sheet 420 in the backlight unit of FIG. 1, and FIG. 7 is a side view of the reflective polarizing module 400 of FIG. 6.
- FIG. 8 is a view illustrating a state in which the bonding pattern 442 is formed on the adhesive layer 440 formed on the bottom surface of the reflective polarizing sheet 420 of FIG. 6.
- a separate adhesive layer 440 is further included in the backlight unit of the present invention.
- the coating layer 430 is formed on the upper surface of the reflective polarizing sheet 420.
- the adhesive layer 440 is formed on the bottom surface of the reflective polarizing sheet 420.
- the adhesive layer 440 may be disposed on 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 440 is provided on the bottom surface of the reflective polarizing sheet 420 with a uniform thickness, and an upper end of the first structured pattern 412 formed on the first light collecting sheet 410 is It is embedded into the adhesive layer 440.
- an upper end portion of the first unit light collector 412a embedded in the adhesive layer 440 disposed on the bottom surface of the reflective polarizing sheet 420 crosses the boundary surface of the second width in the transverse direction with the adhesive layer 440. It is desirable to be buried as much as it has.
- the horizontal length of the buried portion becomes L3 having the second width, and the particles 432 included in the coating layer 430. It is formed relatively smaller than the diameter of L2.
- the light transmitted from the lower portion may be diffused by the diffusion pattern 434 or the particle 432. Can be.
- the adhesion area between the first light collecting sheet 410 and the reflective polarizing sheet 420 is increased, thereby increasing adhesive strength.
- the adhesion state of the first light collecting sheet 410 and the reflective polarizing sheet 420 may be maintained more stably.
- the adhesive layer 440 may be made of the same material as the first light collecting sheet 410 or may be made of a material having different refractive indices.
- a plurality of non-uniform bonding patterns 442 may be further formed on the adhesive layer 440.
- the bonding pattern 442 is protruded downwardly in the form of a protrusion like the diffusion pattern 434 described above, and a plurality of the bonding patterns 442 are formed, and the diameter of each of the protrusions in the transverse direction is relatively larger than that of the second width L3. It can be formed small.
- the bonding pattern 442 is formed on the adhesive layer 440 as described above, even if a bonding surface is generated by a portion in which the first unit light collector 412a is embedded, the light transmitted from the lower portion is diffused.
- the light is diffused by the pattern 434 or the particle 432, and as a part of the first unit light collector 412a is embedded in the adhesive layer 440, the loss of the inclined surface may be minimized to increase the light condensing effect. Can be.
- a plurality of particles 432 are provided not only in the coating layer 430 but also in the adhesive layer 440 to collect the light collected by the first light collecting sheet 410. It may also be configured to diffuse.
- FIG. 9 is a diagram illustrating a state in which the first structured pattern 412 of the plurality of first unit light collectors 412a is unevenly formed in the reflective polarization module 400 of FIG. 1, and FIG. 10 is illustrated in FIG. 10.
- FIG. 1 is a view illustrating a shape in which the respective heights of the reflective polarization module 400 in the extending direction of the first unit light collector 412a are changed.
- a plurality of first unit light collectors 412a are spaced apart from each other along the upper surface of the first base film 414.
- each of the plurality of first unit light collectors 412a may be disposed to be spaced apart from each other on an upper surface of the first base film 414.
- 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 reflective polarizing sheet 420, and the other part is not bonded.
- the optical module 300 It is possible to minimize the reduction in the light collection effect of the transmitted light.
- 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 (11)
- 굴절률이 서로 다른 복수 개의 레이어가 적층되어 광을 선택적으로 투과시키는 반사편광시트;상부로 갈수록 횡단면적이 감소하는 제1단위집광체가 연속적으로 반복되는 제1구조화패턴을 가지며, 상기 제1단위집광체의 상측 끝단부가 상기 반사편광시트의 하부에서 횡 방향으로 제1폭을 가지도록 접합되는 제1집광시트; 및상기 반사편광시트의 상면에 위치하며, 상기 반사편광시트를 투과하여 전달되는 광을 확산시키는 복수 개의 파티클을 가지는 코팅층; 을 포함하며,상기 복수 개의 파티클 중 적어도 일부는 직경이 상기 제1폭보다 상대적으로 작게 형성되는 것을 특징으로 하는 반사편광모듈.
- 제1항에 있어서,상기 코팅층은,상면에 돌출 형성된 복수 개의 확산패턴이 형성되어 상기 반사편광시트를 투과하여 전달되는 광을 확산시키는 것을 특징으로 하는 반사편광모듈.
- 제2항에 있어서,상기 확산패턴은,불균일하게 형성되며, 각각의 횡 방향에 따른 폭이 상기 제1폭보다 상대적으로 작게 형성되는 것을 특징으로 하는 반사편광모듈.
- 제1항에 있어서,상기 반사편광시트의 하면에 위치하여 상기 제1단위집광체의 상측 끝단부가 횡 방향으로 제2폭만큼의 경계면을 가지도록 매립되어 접합되는 접착층을 더 포함하는 것을 특징으로 하는 반사편광모듈.
- 제4항에 있어서,상기 접착층은,불균일한 복수 개의 접합패턴을 가지며 상기 반사편광시트의 하면에 위치하는 것을 특징으로 하는 반사편광모듈.
- 제5항에 있어서,상기 접착층에 형성된 상기 접합패턴의 횡 방향에 따른 직경이 상기 제2폭 보다 상대적으로 작게 형성되는 것을 특징으로 하는 반사편광모듈.
- 제4항에 있어서,상기 접착층은,내부에 복수 개의 상기 파티클이 구비되는 것을 특징으로 하는 반사편광모듈.
- 제1항에 있어서,상기 파티클은,상기 코팅층과 굴절률이 다른 재질로 구성되는 것을 특징으로 하는 반사편광모듈.
- 제1항에 있어서,상기 제1구조화패턴은,수직 단면상에서, 각 제1단위집광체의 최하단부에서 최상단부에 이르는 수직거리가 불균일하게 형성되는 것을 특징으로 하는 반사편광모듈.
- 제8항에 있어서,상기 제1구조화패턴은,상기 제1단위집광체가 길게 연장된 형태로 반복하여 형성되며 연장방향을 따라 높이가 변화되는 것을 특징으로 하는 반사편광모듈.
- 일측에 광원이 구비되어 상기 광원으로부터 발생되는 광을 전달하는 도광판;상기 도광판의 하면에 적층되어 상기 도광판을 통과하여 전달되는 광을 상부로 반사시키는 반사판;상기 도광판의 상부에 적층되어 하부로부터 전달되는 광을 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 레이어가 적층되어 광을 선택적으로 투과시키는 반사편광시트, 상기 반사편광시트의 하부에서 상부로 갈수록 횡단면적이 감소하는 제1단위집광체가 연속적으로 반복되는 제1구조화패턴을 가지며, 상기 제1단위집광체의 상측 끝단부가 상기 반사편광시트의 하부에서 횡 방향으로 제1폭을 가지도록 접합되는 제1집광시트 및 상기 반사편광시트의 상면에 위치하며, 상기 반사편광시트를 투과하여 전달되는 광을 확산시키는 복수 개의 파티클을 가지는 코팅층을 포함하는 반사편광모듈을 가지며,상기 복수 개의 파티클 중 적어도 일부는 직경이 상기 제1폭보다 상대적으로 작게 형성되는 것을 특징으로 하는 백라이트 유닛.
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US15/574,899 US10191321B2 (en) | 2015-05-18 | 2016-05-16 | Reflective polarizing module having particles and backlight unit including same |
CN201680028836.XA CN107636523B (zh) | 2015-05-18 | 2016-05-16 | 具有颗粒的反射型偏振模块及具备其的背光单元 |
JP2017560241A JP6745819B2 (ja) | 2015-05-18 | 2016-05-16 | パーティクルが備えられた反射偏光モジュール及びこれを備えたバックライトユニット |
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