[go: up one dir, main page]

WO2014084525A1 - Plaque de diffusion de lumière et unité de rétro-éclairage la comportant - Google Patents

Plaque de diffusion de lumière et unité de rétro-éclairage la comportant Download PDF

Info

Publication number
WO2014084525A1
WO2014084525A1 PCT/KR2013/010232 KR2013010232W WO2014084525A1 WO 2014084525 A1 WO2014084525 A1 WO 2014084525A1 KR 2013010232 W KR2013010232 W KR 2013010232W WO 2014084525 A1 WO2014084525 A1 WO 2014084525A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
diffusion
pattern
layer
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2013/010232
Other languages
English (en)
Korean (ko)
Inventor
이명원
최정민
금중한
심재호
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongwoo Fine Chem Co Ltd
Original Assignee
Dongwoo Fine Chem Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongwoo Fine Chem Co Ltd filed Critical Dongwoo Fine Chem Co Ltd
Publication of WO2014084525A1 publication Critical patent/WO2014084525A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • 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
    • G02B5/0236—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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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 light diffusion plate having improved brightness and uniformity of emitted light and a backlight unit including the same.
  • Image display apparatuses which are mainly dominated by conventional CRT monitors, have recently been rapidly developed, and wider, lighter and even bent image display apparatuses such as LCDs, OLEDs, and electronic papers have been introduced one after another.
  • a backlight unit may be provided on a rear surface thereof.
  • the backlight unit can be largely divided into a direct type mainly used for a large display device such as a television, and an edge type type mainly used in a small display device such as a computer monitor and a notebook computer.
  • a direct type a plurality of light sources are arranged in a bar shape (CCFL: Cold Cathode Fluorescent Lamp) or a dot (LED: Light Emitting Diode), so that some areas have high brightness and some areas have low brightness. There is a problem that the front uniformity is lowered.
  • the backlight unit is provided with a light diffusion plate for uniformly distributing the light over the entire liquid crystal display panel, and at least one diffusion film, a prism sheet, and the like are provided on the upper side of the diffusion plate, if necessary, so that the light propagation path is vertical. It is changed in the direction so that it is focused on the front of the display surface.
  • At least one diffusion film, a prism sheet, or the like is used in addition to the diffusion plate.
  • a method not only has a problem that it is difficult to achieve low cost and high thickness of the backlight unit, but also shows a limitation when a high brightness of a 32-inch or larger liquid crystal display is required, in which the number of lamps is reduced and the demand is increasing. .
  • An object of the present invention is to provide a light diffusion plate having high luminance and uniformity of emitted light.
  • an object of this invention is to provide the backlight unit and image display apparatus provided with the said light-diffusion plate.
  • a diffusion base layer interposed between the lower diffusion layer on the light incidence side and the upper diffusion layer on the light exit side and having light diffusing particles dispersed therein and having a linear first pattern on the light emission surface side with a curved upper portion.
  • the upper diffusion layer having a line-shaped second pattern having an upper surface at a light exit surface side.
  • the thickness of the diffusion substrate layer is 50 to 90% of the total thickness of the light diffusion plate.
  • the lower diffusion layer is a light diffusion plate formed with irregularities on the light incident surface side surface.
  • Backlight unit having a light diffusion plate of any one of the above 1 to 7.
  • the backlight unit of claim 8 further comprising a light source on the lower side of the lower diffusion layer of the light diffusion plate.
  • An image display device having the backlight unit of 9 above.
  • the light diffusion plate of the present invention can maintain the brightness of the light emitted excellently.
  • the light diffusion plate of the present invention is excellent in concealing performance and uniformity to uniformly emit the light of the backlight light source when applied to the direct type backlight unit to prevent the difference in contrast due to the position of the light source on the entire display screen.
  • the light diffusing plate of the present invention can be improved in scratch resistance when provided with irregularities in the lower layer.
  • FIG. 1 is a perspective view schematically showing an embodiment of the light diffusion plate of the present invention.
  • FIG. 2 is a schematic longitudinal cross-sectional view of the lenticular pattern (a) and the round prism pattern (b) as an example according to the present invention.
  • FIG. 3 is a vertical longitudinal cross-sectional view schematically showing an embodiment of the light diffusion plate of the present invention.
  • FIG 4 is an enlarged longitudinal cross-sectional view of a portion of the diffusion base layer 100 and the upper diffusion layer 200 of the light diffusion plate of the present invention.
  • FIG. 5 is a vertical longitudinal sectional view schematically showing another embodiment of the light diffusion plate of the present invention.
  • Example 6 is an enlarged photograph of a portion of the diffusion base layer and the upper diffusion layer of Example 1 (a) and Example 2 (b).
  • the present invention includes a diffusion substrate layer interposed between the lower diffusion layer on the light incident surface side and the upper diffusion layer on the light exit surface side and having light diffusing particles dispersed therein and having a linear first pattern on the light exit surface side.
  • the upper diffusion layer relates to a light diffusion plate having a brightness and uniformity of the emitted light by providing a line-shaped second pattern having a curved upper surface on the light exit surface side, and a backlight unit having the same.
  • FIG. 1 schematically shows an embodiment of a light diffusing plate 10 according to the present invention.
  • the configuration described in the embodiments and drawings described below are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.
  • the light diffusion plate 10 of the present invention includes a diffusion base layer 100, an upper diffusion layer 200, and a lower diffusion layer 300.
  • the diffusion base layer 100 is a layer interposed between the upper diffusion layer 200 on the light exit surface side and the lower diffusion layer 300 on the light exit surface side.
  • the diffusion base layer 100 includes a first line-shaped pattern having a curved upper surface on the light exit surface side in contact with the upper diffusion layer 200.
  • the line-shaped pattern whose upper surface is curved has a cross-sectional shape (cross section viewed in the x direction in FIG. 1, hereinafter same) in the form of a rectangular shape having the same height from one end to the opposite end of the light diffusion plate, and the longitudinal cross section (Fig. 1).
  • the upper part of the cross section viewed from 1 in the y direction, hereinafter identical) is a pattern forming a curve. Examples of such a pattern include a lenticular pattern or a round prism pattern.
  • FIG. 2 is a schematic cross-sectional view of the lenticular pattern (a) and the round prism pattern (b).
  • the lenticular pattern has a cross-sectional shape in the form of a rectangle having the same height from one end to the other end of the light diffusing plate, the longitudinal section is a curved top, preferably a semi-circle or semi-ellipse.
  • the pattern of the diffusion base layer 100 and the upper diffusion layer 200 shown in FIG. 1 is an example of a lenticular pattern.
  • the round prism pattern is in the form of a rectangle whose cross section has the same height from one end to the other end of the light diffuser plate, and the longitudinal section is a pattern in which the upper vertex portion is arc shaped in a triangular structure.
  • the line connecting the two end points of the bottom edge of the longitudinal section to the end points of the upper arc of the longitudinal section is a straight line pattern.
  • the first pattern of the diffusion base layer 100 according to the present invention functions to diffuse light transmitted from the inside to the outside at the upper curved interface
  • the light diffusion plate 10 of the present invention exhibits high luminance and uniformity. Contributes to
  • the diffusion base layer 100 includes all resins that can be used in the light diffusion plate, but is not limited thereto.
  • Transparent, translucent, white or colored resins and the like can be used, and preferably acrylic resins, styrene-acrylic copolymer resins, styrene resins, styrene-acrylonitrile resins, polys having excellent properties in light transmittance, light resistance, and the like.
  • Carbonate resin and the like may be used alone or in combination of two or more, but is not limited thereto.
  • the acrylic resin may be a methacrylic acid alkyl ester such as methyl methacrylate, ethyl methacrylate, butyl methacrylate or 2-ethylhexyl methacrylate; Alkyl acrylates such as methyl acrylate, ethyl acrylate and butyl acrylate; Methacrylic acid cycloalkyl esters such as cyclohexyl methacrylate, 2-methylcyclohexyl methacrylate and dicyclopentanyl methacrylate; Acrylic acid cycloalkyl esters such as cyclohexyl acrylate and 2-methylcyclohexyl acrylate; Methacrylic acid aryl esters such as phenyl methacrylate and benzyl methacrylate; It is preferable that it is any one homopolymer or their copolymers chosen from acrylic acid aryl esters, such as phenyl acrylate and benzyl acrylate.
  • the styrene-acrylic copolymer resin includes at least one selected from alkyl methacrylate, alkyl acrylate, cycloalkyl methacrylate, cycloalkyl ester of acrylic acid, aryl methacrylate and aryl acrylate, and styrene and ⁇ -methyl styrene. and at least one copolymer selected from m-methylstyrene, p-methylstyrene and p-methoxystyrene.
  • the styrene resin is preferably any one homopolymer or copolymer thereof selected from styrene, ⁇ -methylstyrene, m-methylstyrene, p-methylstyrene, and p-methoxystyrene.
  • the styrene-acrylonitrile copolymer resin is preferably a copolymer of an acrylonitrile monomer with at least one selected from styrene, ⁇ -methylstyrene, m-methylstyrene, p-methylstyrene and p-methoxystyrene.
  • Polycarbonate resins are groups of linear and branched aromatic polycarbonate homopolymers, polyester copolymers or mixtures of one or more thereof prepared by reacting dihydroxy phenol with phosgene or by reaction of dihydroxy phenol with a carbonate precursor. This is preferred.
  • the resin may further include one or more various additives such as ultraviolet absorbers, bluing agents, antioxidants, mold release agents, antistatic agents and the like.
  • the light diffusion particles 110 are dispersed in the diffusion base layer 100.
  • 3 schematically shows a vertical longitudinal cross-sectional view of the light diffusing plate 10 of the present invention.
  • the light diffusing particles 110 are means for further enhancing the diffusion of light passing through the diffusion base layer 100 through reflection, refraction, and scattering of light on the surface and the inside thereof.
  • the light diffusing particles 110 are present in the diffusion base layer 100 and are not present in the upper diffusion layer 200 and the lower diffusion layer 300.
  • the light diffusing plate 10 of the present invention includes the light diffusing particles 110 only in the diffusion base layer 100, thereby obtaining the effect of disposing the light diffusing particles 110 only in the vicinity of the center portion in the thickness direction of the light diffusing plate. This exerts an excellent effect on improving the brightness of the light diffusion plate.
  • the light diffusing particles 110 may be used as long as the material is used in the art, and organic or inorganic light diffusing particles may be used alone or in combination.
  • organic or inorganic light diffusing particles may be used alone or in combination.
  • crosslinked or uncrosslinked fine particles of polycarbonate-based, olefin-based, silicone-based, acryl-based, styrene-based, methyl-styrene copolymers (MS-based), silica, talc, calcium carbonate, barium sulfate, titanium dioxide ( TiO 2 ) and the like can be used.
  • the particle size may range from 0.2 to 50 ⁇ m, and the amount of the particles may be used in an amount of 0.001 to 40 parts by weight based on 100 parts by weight of the base resin of the diffusion base layer 100, and more preferably 0.005 to 10 parts by weight. Wealth is good. It is possible to achieve the desired total light transmittance and haze in the content in the above range.
  • the thickness of the diffusion base layer 100 is not particularly limited, but may be, for example, thicker than that of the upper diffusion layer 200 and the lower diffusion layer 300, and preferably, the sum of the upper diffusion layer 200 and the lower diffusion layer 300. It can be thick. For example, it may have a thickness of 50 to 90% of the total thickness of the light diffusion plate. It is preferable to have the thickness range in view of high luminance and uniformity.
  • the upper diffusion layer 200 is disposed on the light exit surface side of the diffusion base layer 100.
  • the upper diffusion layer 200 includes a second line-shaped pattern having a curved upper surface on a surface from which light is emitted.
  • the line-shaped pattern having an upper curved surface functions to diffuse light transmitted from the inside to the outside. Therefore, by further scattering the light passing through the diffusion base layer 100 according to the present invention, it contributes to further improve the uniformity of the light diffusion plate 10 of the present invention.
  • the second pattern of the upper diffusion layer 200 may include a lenticular pattern or a round prism pattern.
  • the light diffusing plate 10 of the present invention has both the diffusion base layer 100 and the upper diffusion layer 200 each having a line-shaped pattern having a curved upper surface, the light diffusion plate 10 maximizes the light diffusion characteristics to increase the uniformity and brightness of the light.
  • Periods of the line-shaped pattern of which the upper surface of each of the diffusion base layer 100 and the upper diffusion layer 200 are curved are independent of each other, and the pattern period of each layer can be appropriately selected. For example, as illustrated in FIGS. 1 and 3, the periods may be the same so that the unit patterns of the line pattern having the curved upper surface of the diffusion base layer 100 and the upper diffusion layer 200 correspond one-to-one.
  • the height of the first pattern of the diffusion base layer 100 and the height of the second pattern of the upper diffusion layer 200 may be formed at a predetermined ratio.
  • the height of a line-shaped pattern having a curved upper surface means a vertical straight distance from a straight line connecting a portion where the pattern starts at the longitudinal end surface of the pattern to the highest point of the pattern.
  • the height h1 of the first pattern may be 10 to 200 ⁇ m.
  • the material forming the upper diffusion layer 200 may be appropriately selected and used in the same range as the materials forming the diffusion base layer 100 described above.
  • the lower diffusion layer 300 functions to guide light incident on the light diffusion plate 10 to the diffusion base layer 100.
  • the lower diffusion layer 300 may further include irregularities on the surface of the light incident side.
  • the light diffusion plate 10 may be scratched on the bottom surface of the light diffusion plate 300, that is, during the manufacturing process or during use. Such scratches cause a decrease in the uniformity of light.
  • the present invention may not only solve such a problem by further providing irregularities on the surface of the light incidence surface side of the lower diffusion layer 300, but also may further improve the light uniformity of the light diffusion plate.
  • Such irregularities may be formed by methods known in the art such as sand blast.
  • the unevenness of the lower diffusion layer 300 is preferably fine irregularities, for example, unevenness may be generated so that the surface roughness (Ra) is 0.1 ⁇ 10.0 ⁇ m. Within this range, scratch resistance and uniformity improving characteristics may be most effectively exhibited.
  • the lower diffusion layer 300 may further include a pattern on the surface of the light incident side in order to ensure uniformity of the light.
  • the pattern may be an engraved pattern or an embossed pattern.
  • the intaglio pattern may be formed by irradiating a laser onto the light incident surface side of the lower diffusion layer 300, and the embossed pattern may be formed by spraying and curing ink droplets on the light incident surface side of the lower diffusion layer 300. have.
  • the unevenness of the lower diffusion layer 300 described above may be formed after the pattern is formed.
  • the light diffusing plate 10 of the present invention may further include a functional layer in any one of the lower and upper diffusion layers 300 and 200, or impart functionality to the light diffusing plate.
  • the base resin of the functional layer may be a resin exemplified as the base resin of the light diffusion plate, which is the diffusion base layer 100, and may be the same as the base resin of the light diffusion plate, but other materials may be used.
  • Such functional layers may further include one or more of ultraviolet absorbers, heat stabilizers, antioxidants, antistatic agents, fluorescent brighteners, mold release agents, and diffusing agents, and include these functional materials in the base resin or to be coated on the surface. It may be.
  • the manufacturing method of the light diffusion plate 10 is not particularly limited, and various methods such as extrusion molding, vacuum molding, hot press molding, film lamination, solvent bonding, surface coating, ultraviolet curing, and thermal curing can be used. have.
  • extrusion molding to ultraviolet curing method is preferable, and extrusion molding is preferable in consideration of manufacturing cost and productivity.
  • the light diffusing plate 10 of the present invention having a three-layer structure can be easily manufactured by a coextrusion method.
  • the light diffusion plate 10 of the present invention may configure a backlight unit together with a light source.
  • the light emitted from the light source is incident on the lower diffusion layer 300 of the light diffusion plate 10.
  • the light source may be located at the lower side of the lower diffusion layer surface of the light diffusion plate 10.
  • the direct type backlight unit in which the light source is located opposite the lower diffusion layer 300 of the light diffusion plate 10 is preferable, but if a separate reflecting means can properly inject light into the lower diffusion layer surface of the light diffusion plate 10.
  • the light source may be located elsewhere.
  • the light source can be used without limitation, for example, a light emitting diode (LED), an organic light emitting diode (OLED), a hot cathode tube, a cold cathode tube, and the like.
  • a diffusion sheet, a micro lens sheet, a prism sheet, a brightness enhancement (DBEF) sheet, a protective sheet, and the like may be further included on the upper side of the upper diffusion layer 200 of the light diffusion plate 10 as necessary.
  • the light diffusion plate 10 of the present invention may be included as one component of the image display device.
  • the image display device is not particularly limited as long as a separate surface light source is required to display an image, and may be, for example, a liquid crystal display.
  • the light diffusing plate 100 as described above may also be used as one component for supplying a surface light source to a general lighting device.
  • the light diffusion plate was manufactured by coextrusion with the upper diffusion layer, the diffusion base layer, and the lower diffusion layer using polystyrene (refractive index: 1.59) as the base resin.
  • polystyrene reffractive index: 1.59
  • silicon-based particles were dispersed with light diffusing particles, and the amount of light diffusing particles was all the same.
  • the patterns shown in Table 1 were each formed with a pattern period of 300 ⁇ m, and the height of the pattern was 100 ⁇ m in height h1 of the first pattern, and the height of h2 was determined according to Table 1. Formed while changing.
  • FIGS. 6A and 6B show optical micrographs of the upper and upper diffusion layers of the diffusion base layer among the light diffusing plate longitudinal cross sections of Examples 1 (a) and 2 (b).
  • the light diffusing plate manufactured above is positioned above the direct type LED, so that the total light emitted from 9 points (3X3) becomes 1/6, 1/2, and 5/6 horizontally and vertically in the light diffusing plate plane. Average luminance was measured.
  • the light diffusing plate manufactured above is positioned above the direct type LED, and among light emitted from a total of 9 points (3X3) which becomes 1/6, 1/2, and 5/6 horizontally and vertically in the light diffusing plate plane, respectively.
  • the uniformity of the minimum and maximum luminance was measured.
  • the measured average brightness and uniformity are shown in Table 2 below.
  • photographs of light diffusing plates of Examples and Comparative Examples for emitting light in this Test Example are shown in FIGS. 7 (Example) and 8 (Comparative Example).
  • the light diffusing plates of the embodiments are superior in terms of average luminance and uniformity than the comparative example.
  • Comparative Example 3 which does not have a lenticular pattern in the diffusion base layer, can be confirmed that the luminance is almost similar to that of Example 1, but the uniformity is low.
  • Comparative Example 1 having no lenticular pattern in both the diffusion base layer and the upper diffusion layer, the average luminance and uniformity were remarkably low even when the light diffusion particles were distributed throughout the light diffusion plate. .
  • Example 1 which has a smaller thickness of the diffusion base layer, is excellent in average brightness but excellent in Example 2 in uniformity.
  • Example 2 and Example 3 it can be seen that if the irregularities are formed on the light incident surface side of the lower diffusion layer, not only the scratch resistance mentioned above is improved but also the uniformity is further improved.
  • diffusion base layer 110 light diffusing particles

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne une plaque de diffusion de lumière et une unité de rétro-éclairage la comportant, et plus particulièrement une plaque de diffusion de lumière et une unité de rétro-éclairage la comportant qui sont susceptibles de renforcer la luminosité et l'uniformité de la lumière émise, la plaque de diffusion de lumière comportant: une couche de matrice de diffusion interposée entre la couche inférieure de diffusion du côté de la surface d'incidence de lumière et la couche supérieure de diffusion du côté de la surface d'émission de lumière, des particules diffusant la lumière étant dispersées à l'intérieur de celle-ci, et formée avec un premier motif de revêtement présentant une surface supérieure courbe du côté de la surface d'émission de lumière; et la couche supérieure de diffusion étant formée avec un deuxième motif de revêtement présentant un sommet de surface courbe du côté de la surface d'émission de lumière.
PCT/KR2013/010232 2012-11-29 2013-11-12 Plaque de diffusion de lumière et unité de rétro-éclairage la comportant Ceased WO2014084525A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2012-0136754 2012-11-29
KR1020120136754A KR20140072255A (ko) 2012-11-29 2012-11-29 광확산판 및 이를 포함하는 백라이트 유닛

Publications (1)

Publication Number Publication Date
WO2014084525A1 true WO2014084525A1 (fr) 2014-06-05

Family

ID=50828107

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2013/010232 Ceased WO2014084525A1 (fr) 2012-11-29 2013-11-12 Plaque de diffusion de lumière et unité de rétro-éclairage la comportant

Country Status (3)

Country Link
KR (1) KR20140072255A (fr)
TW (1) TWI626476B (fr)
WO (1) WO2014084525A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI699606B (zh) * 2019-01-17 2020-07-21 友達光電股份有限公司 訊號處理方法及顯示裝置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100907231B1 (ko) * 2007-07-31 2009-07-10 신화인터텍 주식회사 광학 시트, 이를 포함하는 백라이트 어셈블리 및 액정 표시장치
KR100983908B1 (ko) * 2008-11-03 2010-09-27 주식회사 상보 광학시트
KR20110034432A (ko) * 2009-09-28 2011-04-05 웅진케미칼 주식회사 확산필름이 일체화된 도광판
KR20110075232A (ko) * 2009-12-28 2011-07-06 동우 화인켐 주식회사 광확산판, 이를 구비한 백라이트 유닛, 액정표시장치 및 조명장치
JP2012142142A (ja) * 2010-12-28 2012-07-26 Nippon Zeon Co Ltd 面光源装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100907231B1 (ko) * 2007-07-31 2009-07-10 신화인터텍 주식회사 광학 시트, 이를 포함하는 백라이트 어셈블리 및 액정 표시장치
KR100983908B1 (ko) * 2008-11-03 2010-09-27 주식회사 상보 광학시트
KR20110034432A (ko) * 2009-09-28 2011-04-05 웅진케미칼 주식회사 확산필름이 일체화된 도광판
KR20110075232A (ko) * 2009-12-28 2011-07-06 동우 화인켐 주식회사 광확산판, 이를 구비한 백라이트 유닛, 액정표시장치 및 조명장치
JP2012142142A (ja) * 2010-12-28 2012-07-26 Nippon Zeon Co Ltd 面光源装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI699606B (zh) * 2019-01-17 2020-07-21 友達光電股份有限公司 訊號處理方法及顯示裝置

Also Published As

Publication number Publication date
TWI626476B (zh) 2018-06-11
KR20140072255A (ko) 2014-06-13
TW201421078A (zh) 2014-06-01

Similar Documents

Publication Publication Date Title
WO2013019025A2 (fr) Dispositif d'éclairage, et afficheur à cristaux liquides utilisant ledit dispositif
WO2011081351A2 (fr) Plaque de guide de lumière à motif, procédé de fabrication, et unité de rétroéclairage d'affichage à cristaux liquides l'utilisant
WO2016064205A1 (fr) Appareil d'éclairage et lampe de véhicule le comprenant
TWI528082B (zh) 照明系統及使用該照明系統的顯示裝置
WO2012039532A1 (fr) Feuille optique, unité optique et dispositif d'éclairage les utilisant
WO2009151217A2 (fr) Feuille optique, ensemble de rétroéclairage et dispositif d'affichage à cristaux liquides comprenant la feuille optique
WO2021002655A1 (fr) Appareil d'affichage et sa plaque de diffuseur
KR20090083875A (ko) 광확산판, 면광원, 및 액정표시장치
KR100893520B1 (ko) 액정표시장치의 백라이트 유닛용 광확산판
WO2017173703A1 (fr) Module de rétroéclairage et afficheur à cristaux liquides
WO2011014006A2 (fr) Feuille optique à condensation lumineuse
WO2012030084A1 (fr) Unité de rétro-éclairage
WO2014084525A1 (fr) Plaque de diffusion de lumière et unité de rétro-éclairage la comportant
WO2020171506A1 (fr) Structure optique pour dispositif à diode électroluminescente et dispositif à diode électroluminescente pour application d'éclairage comprenant celle-ci
WO2012030085A1 (fr) Unité de rétro-éclairage et procédé pour la produire
KR100654241B1 (ko) 액정표시장치의 백라이트 유닛용 광확산판
WO2010047557A2 (fr) Film optique et son emploi dans une unité de rétro-éclairage
KR20110061843A (ko) 광확산판, 이를 구비한 백라이트 유닛, 액정표시장치 및 조명장치
WO2010114345A2 (fr) Plaque de guide de lumière comprenant des particules de diffusion de lumière
KR100851558B1 (ko) 프리즘 시트, 이를 포함하는 백라이트 어셈블리 및 액정표시 장치
WO2011062461A2 (fr) Feuille optique unifiée et dispositif optique la comprenant
WO2012030113A2 (fr) Plaque guide de lumière pour diffuser de la lumière, et unité de rétro-éclairage et écran à cristaux liquides associé
WO2014137087A1 (fr) Plaque de diffusion de lumière et unité de rétroéclairage la comprenant
WO2010005205A2 (fr) Plaque de condensateur à diffusion élevée et ensemble de rétroéclairage utilisant ladite plaque
WO2015141957A1 (fr) Plaque de guidage de lumière, et unité de rétroéclairage comportant cette plaque

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13858967

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13858967

Country of ref document: EP

Kind code of ref document: A1