WO2020222358A1 - 광 경로 제어 기능을 갖는 확산판 및 백라이트 장치 - Google Patents

광 경로 제어 기능을 갖는 확산판 및 백라이트 장치 Download PDF

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Publication number
WO2020222358A1
WO2020222358A1 PCT/KR2019/009185 KR2019009185W WO2020222358A1 WO 2020222358 A1 WO2020222358 A1 WO 2020222358A1 KR 2019009185 W KR2019009185 W KR 2019009185W WO 2020222358 A1 WO2020222358 A1 WO 2020222358A1
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WO
WIPO (PCT)
Prior art keywords
light
diffusion plate
plate
backlight device
dimensional pattern
Prior art date
Application number
PCT/KR2019/009185
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English (en)
French (fr)
Korean (ko)
Inventor
박세희
Original Assignee
희성전자 주식회사
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Publication of WO2020222358A1 publication Critical patent/WO2020222358A1/ko

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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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—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
    • G02B5/0215—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 a regular 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present invention relates to a display device, and more particularly, to a diffuser plate and a backlight device having a function of controlling the path of light emitted from an LED point light source.
  • a display device is a device that receives and displays an image signal, and includes a TV or a monitor, and is a liquid crystal display device (LCD) and an organic light emitting device (OLED) as a means for displaying an image.
  • LCD liquid crystal display device
  • OLED organic light emitting device
  • Emitting Display plasma display device
  • PDP Plasma Display Panel
  • the LCD further includes a backlight device of a surface light source in addition to the liquid crystal panel, and the backlight device uniformly supplies a high-intensity light source to the liquid crystal panel, thereby realizing a quality image.
  • the backlight device refers to a surface lighting device for realizing an image of a display device such as an LCD, and is classified into a direct lighting type or an edge lighting type according to a position at which a light source is disposed.
  • a light source of a backlight device a light emitting diode (hereinafter referred to as'LED') having advantages such as small size, low power consumption, and high reliability is mainly used.
  • a direct type backlight device a plurality of LED light sources are arranged to face upward, a diffusion plate and an optical sheet are arranged at a predetermined distance from the LED light source, and light from the LED light source is emitted directly upward through the diffusion plate and optical sheet. do.
  • Such a direct type backlight device is advantageous for a large-screen backlight device because there is no limitation on the arrangement area of the LED light source.
  • the direct type backlight device has a minimum optical distance (OD) that allows sufficient light mixing between the LED light source and the diffusion plate. Since it must be secured, there is a disadvantage in slimming.
  • OD optical distance
  • various techniques have been proposed to solve the problem caused by hot spots.
  • 1 and 2 are cross-sectional views showing the main configuration of a conventional direct-type backlight device.
  • a plurality of LED light sources 12 are mounted on a substrate 11, and the LED light source 12 has a light scattering material 13a mixed therein. Sealed by the diffusion plate 13, the optical sheet 14 is disposed on the diffusion plate 13, and the reflective sheet 15 is disposed between the substrate 11 and the diffusion plate 13.
  • the light emitted from the LED light source 12 is scattered or reflected in the diffuser plate 13 by the light scattering material 13a, and is diffused to the entire area of the diffuser plate 13 of a transparent resin material. Light of uniform luminance is emitted from the top surface of the plate 13 without a hot spot.
  • a light scattering material 13a having a high concentration of 5% or more is mixed to block hot spots on the diffuser plate 200 of a transparent resin material, and the process is scattered or reflected by the light scattering material 13a.
  • a large amount of light is dissipated in the diffuser so that the diffuser plate has a very low light transmittance.
  • the diffuser plate exhibits a low light transmittance of about 56%. Therefore, since the conventional backlight device lowers the luminance due to the low transmittance by the light scattering material, there is a need to minimize the light loss due to the light scattering material.
  • a diffuser plate 13 having a reflective pattern 13b formed on a lower surface thereof is disposed on an upper portion while forming a predetermined distance from the LED light source 12.
  • This backlight device repeats the process of reflecting the light emitted from the LED light source 12 downward by the reflection pattern 13b having a simple flat structure, and reflecting it upward by the reflection sheet 15, while repeating the diffusion plate 13 ) It is emitted to the top. That is, the light emitted from the LED light source 12 repeats infinite reflection between the reflection pattern 13b and the reflection sheet 15.
  • the reflective pattern 13b and the reflective sheet 15 have a reflectance of about 92%. Since light loss of about 8% occurs in the process of reflecting light each time, light loss increases as the reflection is repeated. Accordingly, the backlight device of FIG. 2 has a problem of lowering luminance due to high light loss due to infinite reflection occurring between the reflective pattern and the reflective sheet.
  • An object of the present invention is to provide a diffuser plate and a backlight device capable of minimizing light loss due to the light scattering material and improving luminance by reducing the concentration of the light scattering material dispersed inside the diffuser plate.
  • an object of the present invention is to provide a diffuser plate and a backlight device capable of improving the structure of a reflection pattern to minimize light loss due to infinite reflection and to improve brightness.
  • the present subject is to provide a diffuser plate and a backlight device capable of improving luminance while minimizing light loss by combining a light scattering material and a reflective pattern.
  • the present embodiment for solving the above problem is a diffuser plate of a backlight device disposed above a plurality of light sources to diffuse light from the light source, wherein the light scattering material is dispersed inside the plate of a transparent material, and the light source below And a three-dimensional pattern formed by filling a light reflective material inside the cavity while the upper surface of the plate at a position corresponding to 1:1 forms a concave-shaped cavity, and the light emitted from the light source includes the light scattering material and It is diffused by the three-dimensional pattern.
  • the plate in which the light scattering material is dispersed may have a light transmittance of 65 to 90%.
  • the three-dimensional pattern may have a curved or inclined reflective surface having a lower surface.
  • the reflective surface may have an asymmetric structure.
  • a transparent resin layer having a refractive index greater than that of the plate may be further formed on an upper surface of the plate.
  • the transparent resin layer may include a light pattern layer formed on the upper surface.
  • the backlight device of this embodiment for achieving the above-described task includes a light source module that emits light upward by mounting a plurality of light sources on a substrate, and a light scattering material is dispersed inside a plate made of a transparent material to cover the light source. While the diffusion plate is coupled to the substrate, and a three-dimensional pattern formed by forming a concave-shaped cavity on an upper surface of the diffusion plate and filled with a light reflecting material inside the cavity, the light emitted from the light source is scattered It is diffused and emitted by the ash and the three-dimensional pattern.
  • the diffusion plate may be coupled to the substrate to seal the light source.
  • the backlight device of the present embodiment may further include a reflective sheet interposed between the substrate and the diffusion plate.
  • the diffuser plate and the backlight device according to the present embodiment can improve luminance by minimizing light loss occurring inside the diffuser plate, and at the same time control the direction of light traveling inside the diffuser plate to achieve uniform brightness.
  • the diffusion plate and the backlight device of the present embodiment can be manufactured to be slimmer by controlling the light path by combining the concentration of the light scattering material and the three-dimensional pattern.
  • FIG. 1 is a cross-sectional view showing a direct type backlight device according to the prior art
  • FIG. 2 is a cross-sectional view showing a direct-type backlight device according to another conventional technology
  • FIG. 3 is a cross-sectional view showing a direct type backlight device according to a first embodiment of the present subject
  • FIG. 4 is a cross-sectional view showing a direct type backlight device according to a second embodiment of the present subject
  • FIG. 5 is a cross-sectional view showing a direct type backlight device according to a third embodiment of the present subject
  • FIG. 6 is a cross-sectional view showing a direct type backlight device according to a fourth embodiment of the present subject.
  • FIG 3 is a cross-sectional view illustrating a direct type backlight device according to a first embodiment of the present subject.
  • the backlight device seals the light source module 100 on which a plurality of LED elements 120 are mounted on the substrate 110 and the LED elements 120 while sealing the LED element 120 on the substrate 110.
  • a diffusion plate 200 formed to a predetermined thickness, a reflective sheet 300 intervening between the substrate 110 and the diffusion plate 200, a three-dimensional pattern 400 formed on the upper surface of the diffusion plate 200, and an upper portion of the diffusion plate It includes an optical sheet 500 disposed on.
  • a liquid crystal panel (not shown) is disposed on the optical sheet 500 to configure a display device.
  • the light of the point light source emitted from the LED element 120 is diffused and scattered while passing through the inside of the diffusion plate 200, and at the same time, the side or lower diagonal line by the upper three-dimensional pattern 400 It is reflected in the direction and is distributed as light of a uniform surface light source as a whole inside the diffuser plate 200 and is emitted to the upper surface.
  • the LED module 100 is a light source of a backlight device, and a plurality of LED elements 120 are mounted on a substrate 110 at predetermined intervals in a horizontal, vertical, diagonal, or arbitrary direction.
  • a predetermined circuit is printed on the substrate 110, and the LED element 120 is composed of a top view type element emitting light upward or a multi-faceted light emitting element including an upper light emitting surface. Light emitted from each LED element 120 is incident into the diffuser plate 200.
  • the diffuser plate 200 absorbs light from the LED element 120 while sealing the LED element 120, diffuses the absorbed light to the entire area of the diffuser plate 200, and induces it to be emitted to the upper surface.
  • the diffusion plate 200 is composed of a plate made of a resin material having high transparency to minimize light loss inside, for example, including any one or more of PS, PC, PMMA, PE, PET, PP, and MMA-styrene. It can be composed of a transparent material.
  • the diffuser plate 200 is not limited to its type as long as it is a material having high transparency.
  • the diffusion plate 200 is integrated with the light source module 100 through a process such as injection molding, dispensing molding or hot melt molding using the light source module 100 as an insert. It can be formed as Accordingly, the light emitted from the LED element 120 is directly incident on the diffusion plate 200 without passing through the air layer, thereby preventing light loss in the air layer due to a difference in refractive index.
  • the diffusion plate 200 includes a light scattering material 210 that scatters and reflects light incident therein.
  • the light scattering material 210 is mixed at a concentration such that the diffuser plate 200 has a predetermined light transmittance, and in this embodiment, the light scattering material 210 is used to have a light transmittance of 65 to 90%. Is mixed.
  • the diffusion plate 200 has a light transmittance of less than 65%, luminance decreases, and when it exceeds 90%, uniformity of luminance decreases.
  • the reflective sheet 300 is disposed between the substrate 110 and the diffusion plate 200, that is, on the upper surface of the substrate 110, and the light scattered and reflected by the light scattering material 210 or reflected by the three-dimensional pattern 400 is It is reflected to be emitted to the upper surface of the diffusion plate 200.
  • the reflective sheet 300 may be formed by bonding a sheet or film having a high reflectivity to the upper surface of the substrate 110 or coating a material having a high reflectivity on the upper surface of the substrate 110.
  • the three-dimensional pattern 400 diffuses light emitted from the LED device 120 vertically upward or scattered and reflected from the light scattering material 210 to the side so that the light is uniformly distributed over the entire area of the diffusion plate 200. .
  • the three-dimensional pattern 400 is formed by being coupled to the upper surface of the diffusion plate 200 at a position corresponding to the position of the LED element 120. That is, the three-dimensional pattern 400 is formed at a position where the vertical central axis coincides with each LED element 120 and corresponds to 1:1.
  • the three-dimensional pattern 400 is formed to have a larger diameter than the light exit surface of the LED element 120 so as to cover the light exit surface of the LED element 120.
  • the three-dimensional pattern 400 forms a three-dimensional shape of a 3D structure and has a reflective surface 410 having a curved structure, and the three-dimensional pattern 400 for this has a hemispherical shape or a semi-elliptic shape.
  • the three-dimensional pattern 400 may be formed by filling a light reflecting material in a cavity in which the upper surface of the diffusion plate 200 is concavely engraved.
  • the light reflective material constituting the three-dimensional pattern 400 may be composed of a single or a mixture including any one or more of TiO2, CaCO3, ZnS, Si, Ag, Al, SiO2, BaSO4, and Al2O3.
  • the three-dimensional pattern 400 may be formed by filling all regions of the cavity with a light reflective material or coating along the surface. At this time, the three-dimensional pattern 400 is formed to have a reflectance of about 60 to 90%. When the three-dimensional pattern 400 has a reflectance of less than 60%, a hot spot may occur, and if the three-dimensional pattern 400 has a reflectance of 90% or more, a dark portion may be generated by the three-dimensional pattern 400.
  • the optical sheet 500 controls a traveling direction of light emitted from the diffusion plate 200.
  • the optical sheet 500 for this may include a diffusion sheet or a prism sheet.
  • the light emitted from the LED element 120 is scattered or reflected by the light scattering material 210, and in particular, the light emitted vertically upward is side or inclined by the three-dimensional pattern 400. After being reflected in the direction, it is reflected again by the reflective sheet 300 or directly emitted to the top surface of the diffusion plate 200. Therefore, in the backlight device of this embodiment, since the light emitted from the LED element 120 is diffused by the three-dimensional pattern 400, the concentration of the light scattering material 210 can be reduced to reduce light loss caused by the light scattering material 210. have. In addition, the backlight device minimizes a process in which light emitted from the LED element 120 is reflected between the three-dimensional pattern 400 and the reflective sheet 300 to be emitted, thereby minimizing light loss occurring in the reflection process.
  • 4 to 6 are cross-sectional views illustrating a direct type backlight device according to various embodiments of the present disclosure.
  • the backlight device has a reflective surface 410 having an inclined structure while the three-dimensional pattern 400 forms an inverted cone or inverse repamide shape.
  • the inverse cone or inverse pyramid shape refers to a shape whose diameter is relatively narrowed toward the lower side so that light can be reflected in the lateral oblique direction, and the vertex angle may form a round shape having a predetermined curvature.
  • the three-dimensional pattern 400 may have a circular or rectangular cross section.
  • the three-dimensional pattern 400 may form a polyhedral structure in which a cross section forms various shapes such as polygons, and the shape is not limited thereto.
  • the three-dimensional pattern 400 may have a wedge shape, a lenticular shape, and an asymmetric shape. That is, the three-dimensional pattern 400 is configured to have the reflective surface 410 having an asymmetric structure, so that the light is more evenly distributed inside the diffusion plate.
  • a transparent resin layer 600 is further formed on the upper surface of the diffusion plate 200.
  • the transparent resin layer 600 is formed on the top surface of the diffusion plate 200 including the three-dimensional pattern 400 to have a predetermined thickness, and diffuses the light emitted from the diffusion plate 200 again so that more uniform light is emitted.
  • the transparent resin layer 600 is made of a transparent resin material having a larger refractive index than the diffusion plate so that total reflection does not occur at the interface with the diffusion plate 200.
  • the transparent resin layer 600 may form a light pattern 610 on the upper surface.
  • the light pattern 610 is a configuration that enhances the diffusivity of the emitted light, and may form various shapes such as a dot shape, a pyramid shape, and a lenticular shape.
  • [Table 1] is a result of testing the optical characteristics of the backlight device of this embodiment.
  • a diffuser plate (Comparative Example, Reference) in which a transparent resin without a light scattering material was used and a reflective pattern of a flat structure was formed on the top surface, and a light scattering material was mixed so as to have a light transmittance of 59% on the top surface.
  • a diffusion plate in which a three-dimensional pattern in an inverted pyramid shape is formed (Experimental Example 2), and a diffusion plate in which a light scattering material is mixed so as to have a light transmittance of 70% in a transparent resin and a three-dimensional pattern in an inverted pyramid shape is formed on the upper surface (Experimental Example 3).
  • optical properties were measured on the top of the optical sheet composed of a diffusion sheet and a pair of prism sheets, respectively, and the results are shown.
  • the diffuser plate (Experimental Example 1) in which the light scattering material was mixed so as to have a light transmittance of 59% and the three-dimensional pattern was formed on the upper surface was 20.3. It can be seen that a luminance increase of% appears and the luminance uniformity is also improved by 4.1%. In addition, even in the case of a diffuser plate having a light transmittance of 70% (Experimental Example 2), the luminance increase of 20.4% and the uniformity improvement effect of 3.1% are exhibited. Therefore, the diffuser plate and the backlight device of the present embodiment have a concentration of the light scattering material. Light loss can be improved, and the diffuser plate having a high light transmittance can be combined with a three-dimensional pattern to simultaneously improve luminance and uniformity of luminance.
PCT/KR2019/009185 2019-04-30 2019-07-24 광 경로 제어 기능을 갖는 확산판 및 백라이트 장치 WO2020222358A1 (ko)

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KR1020190050215A KR20200127064A (ko) 2019-04-30 2019-04-30 광 경로 제어 기능을 갖는 확산판 및 백라이트 장치
KR10-2019-0050215 2019-04-30

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