US20060133109A1 - Light diffusion member, back light assembly including the same and display device including the same - Google Patents

Light diffusion member, back light assembly including the same and display device including the same Download PDF

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Publication number
US20060133109A1
US20060133109A1 US11/268,027 US26802705A US2006133109A1 US 20060133109 A1 US20060133109 A1 US 20060133109A1 US 26802705 A US26802705 A US 26802705A US 2006133109 A1 US2006133109 A1 US 2006133109A1
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Prior art keywords
light
polymer
diffusion member
light diffusing
transition temperature
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US11/268,027
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Inventor
Geun-Hyung Kim
Jong-Dae Park
Tae-Seok Kim
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, GEUN-HYUNG, KIM, TAE-SEOK, PARK, JONG-DAE
Publication of US20060133109A1 publication Critical patent/US20060133109A1/en
Priority to US13/079,510 priority Critical patent/US8268441B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • 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
    • G02B5/0226—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 having particles on the surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/06—Substrate layer characterised by chemical composition
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31507—Of polycarbonate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • the present invention relates to a light diffusion member, a back light assembly including the same, a display device including the same, and a copolymer for the light diffusion member. More particularly, the present invention relates to a light diffusion member exhibiting an improved light luminance and an improved light diffusing efficiency with a reduced manufacturing cost, a back light assembly including the same, and a display device including the same.
  • a display device transforms data having electric signals after being processed by an information processing unit into an image.
  • a liquid crystal display device is one type of display device and displays an image utilizing an electric characteristic and an optical characteristic of liquid crystal.
  • the liquid crystal display device includes a liquid crystal display panel and a device for providing light to display the image. Light generated from the device for providing light passes through liquid crystal included in the liquid crystal panel to display the image on the liquid crystal display panel.
  • the quality of the displayed image on the liquid crystal display device is largely dependent on the luminance and luminance uniformity of the light generated from the device for providing light.
  • an optical membrane is provided between the device for providing light and the liquid crystal display panel.
  • the optical membrane improves the uniformity of the luminance and the luminance uniformity of the light generated from the device for providing light to improve the quality of the image displayed on the liquid crystal display panel.
  • a diffusion member such as a diffusion plate and a diffusion sheet, is used to induce the diffusion of light.
  • the diffusion plate is commonly used in a liquid crystal display device for a television set, and the diffusion sheet is generally provided on the diffusion plate.
  • the diffusion plate is generally manufactured using polymethyl methacrylate (“PMMA”). This material functions to induce a light diffusing phenomenon when the light passes there through to increase the uniformity of the non-uniform light luminance of the light from a light source to some degree.
  • the diffusion sheet includes PMMA beads coated on a base matrix and diffuses light.
  • the base matrix is generally obtained by using polyethylene terephthalate (“PET”).
  • the PET based material of the base matrix is affected when the diffusion plate is deformed. Also, the PET base itself might be deformed due to an applied heat that might then induce a wrinkling phenomenon of the diffusion sheet.
  • the light diffusion member including the diffusion plate and the diffusion sheet according to the conventional method might generate luminance loss due to an air gap present between the diffusion plate and the diffusion sheet.
  • the present invention provides a light diffusion member providing an improved light luminance and an improved light diffusing efficiency, preventing a wrinkling phenomenon, and reducing the manufacturing cost.
  • the present invention also provides a back light assembly including the above light diffusion member.
  • the present invention still also provides a liquid crystal display device including the above light diffusion member.
  • the present invention still also provides a copolymer applicable for the above light diffusion member.
  • a light diffusion member including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a polymer mixture obtained by uniformly blending a first polymer having a first glass transition temperature and a second polymer having a second transition temperature higher than the first transition temperature.
  • the light diffusing body diffuses an incident light through a light exiting surface of the light diffusing body.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a light diffusion member including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a polymer mixture of polyethylene terephthalate/polycarbonate obtained by uniformly blending polyethylene terephthalate and polycarbonate.
  • the light diffusing body diffuses incident light through a light exiting surface of the light diffusing body.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin including beads.
  • a light diffusion member including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a polymer mixture obtained by uniformly blending a plurality of polymers.
  • the light diffusing body diffuses an incident light towards a light exiting surface of the light diffusing body.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a light diffusion member including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a copolymer having a first polymer having a first glass transition temperature and a second polymer having a second glass transition temperature higher than the first glass transition temperature.
  • the first and second polymers are arranged as repeating units.
  • the light diffusing body diffuses an incident light through a light exiting surface of the light diffusing body.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a light diffusion member including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a copolymer including polyethylene terephthalate and polycarbonate as repeating units.
  • the light diffusing body diffuses an incident light through a light exiting surface.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a light diffusion member including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a copolymer including a plurality of polymers as repeating units.
  • the light diffusing body diffuses an incident light through a light exiting surface.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a copolymer for a light diffusion member including a first repeating unit of at least one polymer selected from a group consisting of polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate and a second repeating unit of at least one polymer selected from a group consisting of polycarbonate, cyclic olefin copolymer, and polymethyl methacrylate in a mixing ratio of 2-4:6-8 by weight.
  • the copolymer has a glass transition temperature in a range of from about 100 to about 125° C.
  • a back light assembly including a receiving container, a light source generating light, the light source received in the receiving container, and a light diffusion member provided on the light source and including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a polymer mixture obtained by uniformly blending a first polymer having a first glass transition temperature and a second polymer having a second glass transition temperature higher than the first glass transition temperature.
  • the light diffusing body diffuses an incident light through a light exiting surface of the light diffusing body.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a back light assembly including a receiving container, a light source generating light, the light source received in the receiving container, and a light diffusion member provided on the light source and including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes a copolymer including a first polymer having a first glass transition temperature and a second polymer having a second glass transition temperature higher than the first glass transition temperature as repeating units.
  • the light diffusing body diffuses an incident light through a light exiting surface of the light diffusing body.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a liquid crystal display device including a back light assembly and a display unit provided on a light diffusion member of the back light assembly, the display unit changing diffused light into an image light including information.
  • the back light assembly includes a receiving container, a light source generating light, the light source received in the receiving container, and a light diffusion member provided on the light source and including a light diffusing body and a light diffusing layer.
  • the light diffusing body includes one of a polymer mixture obtained by uniformly blending a first polymer having a first glass transition temperature and a second polymer having a second glass transition temperature higher than the first glass transition temperature and a copolymer of the first polymer and the second polymer as repeating units.
  • the light diffusing body diffuses an incident light through a light exiting surface of the light diffusing body.
  • the light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads.
  • a light luminance and a light diffusing efficiency of a liquid crystal display device including the light diffusion member can be improved and a wrinkling phenomenon of the light diffusion member may be prevented.
  • the manufacturing cost of the liquid crystal display device may be reduced.
  • FIG. 1 is a schematic cross-sectional view showing an exemplary embodiment of a light diffusion member according to the present invention
  • FIG. 2 is a schematic cross-sectional view showing an exemplary embodiment of a back light assembly according to the present invention
  • FIG. 3 is an exploded perspective view showing an exemplary embodiment of a liquid crystal display device according to the present invention.
  • FIG. 4 is a graph illustrating an exemplary embodiment of the change in the elastic modulus of PET/PC polymer mixture with respect to the temperature according to the present invention
  • FIG. 5 is a graph illustrating an exemplary embodiment of the change in a glass transition temperature of a PET/PC polymer mixture in the light diffusing body with respect to PET weight fraction according to the present invention.
  • FIG. 6 is a graph illustrating an exemplary embodiment of a heat absorbing amount of a PET/PC polymer mixture in the light diffusing body according to the present invention.
  • FIG. 1 is a schematic cross-sectional view showing an exemplary embodiment of a light diffusion member according to the present invention.
  • a light diffusion member 100 includes a light diffusing body 10 and a light diffusing layer 20 formed on the light diffusing body 10 .
  • the light diffusion member 100 diffuses incident light from a light source 50 through a light exiting surface of the light diffusing body 10 , where the light exiting surface may be a layer of the light diffusing body 10 , or may simply be the outermost surface of the light diffusing body 10 that faces the light diffusing layer 20 .
  • the light diffusion member 100 includes a polymer mixture obtained by uniformly blending a first polymer and a second polymer.
  • a complex material having a novel physical property can be prepared through the blending process.
  • the blending process is preferably implemented until a uniform product is obtained.
  • the glass transition temperature or a humidity absorbance of the polymer mixture is not constant and thus the obtained mixture would not be made commercially available.
  • the polymers are preferably selected so that the polymer mixture exhibits a high glass transition temperature and a low humidity absorbance. Different polymers having complementary properties can be selected to optimize the desired properties of the polymer mixture. In addition, the price of each polymer also might be considered as a factor in determining which polymers to utilize in the polymer mixture.
  • the preferred glass transition temperature of the polymer mixture is about 100° C. or higher.
  • the glass transition temperature of polymethyl methacrylate (“PMMA”) included in the conventional light diffusing body is about 104° C. Accordingly, a polymer mixture of which the glass transition temperature is at least 100° C. or higher is required for the manufacture of the light diffusing body 10 in place of the conventional light diffusing body of PMMA.
  • the first polymer and the second polymer included in the polymer mixture polymers producing a polymer mixture having a glass transition temperature of 100° C. or higher and a lower humidity absorbance than PMMA through the blending process can be used.
  • the first polymer includes a polyester-based polymer such as polyethylene terephthalate (“PET”), polyethylene naphthalate, and polybutylene terephthalate.
  • PET polyethylene terephthalate
  • the polyester-based first polymer has an advantage of having a low humidity absorbance.
  • the second polymer includes polycarbonate (“PC”), cyclic olefin copolymer (“COC”), polymethyl methacrylate, and the like.
  • the glass transition temperature of the first polymer is about 70 to about 80° C. and the glass transition temperature of the second polymer is about 130 to about 150° C.
  • the first and second polymers are blended in a predetermined mixing ratio to prepare the polymer mixture having the glass transition temperature of about 100° C. or higher.
  • the light diffusing layer 20 includes a binder resin 22 having a plurality of beads 24 distributed throughout the binder resin 22 .
  • the beads 24 are formed using PMMA, PET, etc.
  • an acryl-based resin such as PMMA can be used.
  • the light diffusing body 10 is manufactured as follows. The first polymer and the second polymer are blended in a blending apparatus and then the obtained product is cooled. The cooled product is extruded and cut to a predetermined shape, such as, but not limited to, a rectangular plate shape.
  • the thickness of the formed light diffusing body 10 is set when the light diffusing body 10 is passed through a T-Die after the blending.
  • the preferred thickness of the light diffusing body is from about 0.7 to about 1.2 mm. When the thickness of the light diffusing body 10 is less than 0.7 mm, the elastic modulus of the light diffusing body 10 is too low and a surface wrinkling due to the contraction of the material may be generated. When the thickness of the light diffusing body 10 exceeds 1.2 mm, a curvilinear motion of the light diffusing body 10 while moving on a roll for coating the light diffusing layer 20 becomes difficult.
  • an adhesion preventing layer facing the light exiting surface of the light diffusing body 10 may be formed on the light diffusion member 100 , such as on the light diffusing body 10 .
  • the adhesion preventing layer functions to prevent the slip of the light diffusing body 10 while moving on the roll for coating the light diffusing layer 20 .
  • the adhesion preventing layer may be formed using PMMA, PET, and the like.
  • the light diffusing body 10 is preferably formed using a PET/PC polymer mixture obtained by uniformly blending PET with PC.
  • PC is prepared by using a solvent polymerization method.
  • a reaction proceeds at an interface of an aqueous layer in which bisphenol A (“BPA”) is dissolved and an organic solvent layer in which phosgene (“CDC”) is dissolved, under the presence of an acid binder and a solvent.
  • BPA bisphenol A
  • CDC phosgene
  • the polymer mixture includes about 20-40% by weight of PET and about 60-80% by weight of PC.
  • the mixing ratio is determined by considering the high humidity absorbance of PET and the high glass transition temperature of PC.
  • the glass transition temperature of the PET/PC polymer mixture is calculated by following Equation 1.
  • T g ( T g1 T g2 )/( w 1 T g2 +w 2 T g1 ) [Equation 1]
  • T g , T g1 and T g2 respectively represent the glass transition temperature T g of the polymer mixture, the glass transition temperature T g1 of the first polymer, and the glass transition temperature T g2 of the second polymer.
  • W 1 and W 2 represent the weight percents of the first polymer and the second polymer, respectively.
  • the glass transition temperature T g1 of PET is about 78° C. and the glass transition temperature T g2 of PC is about 140° C. Accordingly, the glass transition temperature T g of the PET/PC polymer mixture obtained by mixing 20% by weight of PET and 80% by weight of PC is approximately 116° C. Because this temperature T g is higher than the glass transition temperature of PMMA, about 104 to 106° C., the probability of generating deformation due to heat, etc. can be reduced. In addition, since this PET/PC polymer mixture includes PET having very low humidity absorbance, the durability thereof is very good.
  • the preferred glass transition temperature T g is about 100-121° C.
  • the polymer mixture in the light diffusing body 10 has been described as including a first polymer and a second polymer
  • the polymer mixture included in the light diffusing body 10 might include three or more polymers.
  • Each polymer may have different glass transition temperatures and humidity absorbances from one another.
  • polymers that give a polymer mixture having an optimized glass transition temperature T g , humidity absorbance, and lower cost are selected.
  • the light diffusing layer 20 is formed on the light diffusing body 10 by means of a coating method.
  • the light diffusing layer 20 is directly coated on the light diffusing body 10 by means of the coating method to produce the light diffusion member 100 and thus does not require a base matrix as part of the light diffusion member 100 . Therefore, the wrinkling phenomenon due to a deformation of the base matrix is not generated in the light diffusion member 100 . That is, in the light diffusion member 100 , the light diffusing body 10 and the light diffusing layer 20 are formed in one integrally body, as a solitary unit rather than as separate sheets. Therefore, the manufacturing efficiency is improved and the unit manufacturing cost is reduced. Also, the thickness of the liquid crystal display device may be reduced and a gap between the light diffusing body 10 and the light diffusing layer 20 is eliminated.
  • the light diffusion member 100 includes the same components described in Embodiment 1 except utilizes a different arrangement for the light diffusing body 10 . Therefore, the same reference numerals are given to the same components and repeated explanation will be omitted.
  • the light diffusion member 100 includes a copolymer within the light diffusing body 10 having the first and the second polymers arranged as repeating units. That is, for example, instead of blending the first and second polymers to form a polymer mixture as in Embodiment 1, at least one layer of the first polymer and at least one layer of the second polymer form the light diffusing body 10 .
  • the copolymer exhibits an improved stability or uniformity of physical properties such as glass transition temperature and humidity absorbance, when compared with the polymer mixture prepared by Example 1.
  • the second polymer preferably has a higher glass transition temperature (T g2 ) and a higher humidity absorbance than the first polymer.
  • T g2 glass transition temperature
  • the preferred glass transition temperature T g of the copolymer is about 100° C. or higher.
  • the glass transition temperature of PMMA included in the conventional light diffusing body is about 104° C. Therefore, in order to replace PMMA for the preparation of the light diffusing body 10 , a copolymer having a glass transition temperature of at least 100° C. is required.
  • first and the second polymers polymers producing a copolymer having the glass transition temperature T g of about 100° C. or higher and the humidity absorbance lower than that of PMMA can be used.
  • first polymer polyester-based polymer such as PET, polyethylene naphthalate, and polybutylene terephthalate can be used.
  • second polymer PC, cyclic olefin copolymer, and PMMA, and the like can be used.
  • the preferred glass transition temperature T g1 of the first polymer is about 70-80° C. and the preferred glass transition temperature T g2 of the second polymer is about 130-150° C.
  • a copolymer including the two polymers as repeating units having the glass transition temperature of about 100° C. or higher is used.
  • the light diffusing body 10 preferably includes the copolymer including PET and PC as repeating units.
  • the repeating units of PET and PC are linearly arranged in a mixing ratio of 2-4:6-8 by weight.
  • the units, or layers, of the polymers may have varying thicknesses.
  • the mixing ratio by weight is determined so that the high humidity absorbance of PET and the high glass transition temperature of PC can be maximized.
  • the transition temperature T g of the copolymer can be calculated by following Equation 1.
  • T g ( T g1 T g2 )/( w 1 T g2 +w 2 T g1 ) [Equation 1]
  • T g , T g1 and T g2 represent the glass transition temperature T g of the copolymer, the glass transition temperature T g1 of the first polymer, and the glass transition temperature T g2 of the second polymer.
  • W 1 and W 2 respectively, represent the weight percents of the first polymer and the second polymers repeated in the copolymer.
  • the glass transition temperature T g1 of PET is about 78° C. and the glass transition temperature T g2 of PC is about 140° C.
  • the glass transition temperature T g of the copolymer becomes approximately 116° C. according to the above-described Equation 1. Since this temperature T g is higher than the glass transition temperature of PMMA, which is about 104 to 106° C., the probability of deformation due to heat can be reduced. In addition, since the physical property of PET having a very low humidity absorbance is exhibited, the durability thereof is also very good.
  • the glass transition temperature T g of the PET/PC copolymer is preferably in the range of about 100 to 121° C. when considering the humidity absorbance.
  • the light diffusing body 10 may also include a copolymer having three or more polymers arranged as repeating units or layers according to this embodiment. Each polymer exhibits a different glass transition temperature T g and humidity absorbance. By considering the properties of polymers, appropriate polymers giving the copolymer an optimized glass transition temperature T g and humidity absorbance are selected.
  • the copolymer for the light diffusion member 100 includes the first repeating unit of PET, polyethylene naphthalate, or polybutylene terephthalate and the second repeating unit of PC, cyclic olefin copolymer, or PMMA, and the first and second repeating units are arranged repeatedly, that is, there may be a plurality of each repeating unit or layer provided within the copolymer and the first and second repeating units may be alternatingly arranged in a pattern or irregularly.
  • the copolymer includes the first polymer and the second polymer in a mixing ratio of 2-4:6-8 by weight and has a glass transition temperature of about 100-125° C.
  • the molecular weight of the copolymer for the light diffusion member 100 is about 10,000 to 100,000.
  • the humidity absorbance of the copolymer is about 0.01-1.0%.
  • the preferred copolymer for the light diffusion member is a block copolymer including the first repeating unit of PET and the second repeating unit of PC in a mixing ratio of 2:8 by weight, and the first and second repeating units are arranged repeatedly and irregularly.
  • the glass transition temperature T g of the block copolymer is about 116° C. and the molecular weight thereof is about 10,000 to 100,000.
  • the copolymer has a higher glass transition temperature T g and a lower humidity absorbance than the conventionally used PMMA, the probability of deformation of the light diffusion member 100 due to heat and the change of the physical properties due to humidity may be reduced, thereby improving the performance of the light diffusion member 100 .
  • FIG. 2 is a schematic cross-sectional view showing an exemplary embodiment of a back light assembly according to the present invention.
  • a back light assembly 500 includes a receiving container (not shown), a light source 50 and a light diffusion member 100 .
  • a plurality of vertically downward radiating lamps is used as the light source 50 , however other types of lamps and lamp arrangements are within the scope of these embodiments.
  • the light source 50 is received in the receiving container and generates light to radiate the light to the light diffusion member 100 .
  • the light diffusion member 100 includes a light diffusing body 10 and a light diffusing layer 20 . Since the light diffusion member 100 in this embodiment is illustrated and described with respect to FIG. 1 and Embodiment 1, the same reference numerals are given to the same components of the light diffusion member 100 and the same explanation of the components will be omitted.
  • the back light assembly 500 further includes a light collecting member 110 and a passivation layer 120 .
  • the light collecting member 110 is provided on the light diffusion member 100 .
  • the light collecting member 110 refracts light passed through the light diffusion member 100 and collects the light toward a displaying unit (not shown). Therefore, the light collecting member 110 improves a front side luminance.
  • the passivation layer 120 is provided on the light collecting member 110 and physically protects the light collecting member 110 .
  • an edge-type lamp may alternatively be used.
  • a back light assembly according to this embodiment includes the same components as described with respect to Embodiment 3 except for a different light diffusion member 100 . Accordingly, the explanation on the same components will be omitted.
  • the back light assembly 500 includes the light diffusion member 100 .
  • the light diffusion member 100 includes the light diffusing body 10 including the copolymer described in Embodiment 2.
  • FIG. 3 is an exploded perspective view showing an exemplary embodiment of a liquid crystal display device according to the present invention.
  • the explanation of the light diffusion member 100 will be omitted and the same reference numerals are given to the same components because the same light diffusion member 100 illustrated in FIG. 1 and described with respect to Embodiments 1 and 2 is used.
  • a liquid crystal display device 1000 includes a display unit 400 for displaying an image by an applied image signal and a back light assembly 500 for providing light to the display unit 400 .
  • the display unit 400 includes a liquid crystal display panel 410 , a data printed circuit board 420 , a gate printed circuit board 430 , a data tape carrier package (“TCP”) 440 , and a gate TCP 450 .
  • the liquid crystal display panel 410 includes a TFT substrate 411 and a color filter substrate 413 , and liquid crystal (not shown) is injected between the TFT substrate 411 and the color filter substrate 413 .
  • the TFT substrate 411 is a transparent glass substrate on which TFTs (not shown) are formed in a matrix shape.
  • a data line is connected to a source terminal of the TFT, and a gate line is connected to a gate terminal thereof.
  • a pixel electrode includes a transparent and conductive material such as, but not limited to, indium tin oxide (“ITO”).
  • ITO indium tin oxide
  • the color filter substrate 413 is a substrate on which color pixels of red, blue, and green (“RGB”) pixels are formed for illustrating predetermined color when the light transmits.
  • the front surface of the color filter substrate 413 is coated with a common electrode including a transparent and conductive material such as, but not limited to, ITO.
  • a data TCP for determining the applying time of a data driving signal is attached to the data line of the liquid crystal display panel 410
  • a gate TCP 450 for determining the applying time of a gate driving signal is attached to the gate line.
  • the data printed circuit board 420 connects to the data TCP 440 , receives external image signals of the liquid crystal display panel 410 , and applies a driving signal to the data line.
  • the gate printed circuit board 430 connects to the gate TCP 450 and applies a driving signal to the gate line.
  • the liquid crystal display device 1000 separately includes the data printed circuit board 420 and the gate printed circuit board 430 .
  • the liquid crystal display device 1000 may alternatively include a combined printed circuit board (not shown) of the data printed circuit board 420 and the gate printed circuit board 430 .
  • the back light assembly 500 includes a plurality of lamps 52 as the light source 50 , a reflecting plate 40 , a light diffusion member 100 , a light collecting member 110 , a passivation layer 120 for protecting the light collecting member 110 , and a receiving container 30 for receiving the above components.
  • the lamps 52 generate light
  • the light diffusion member 100 is provided on the light source 50 to diffuse the light provided from the light source 50 to output light having uniform luminance.
  • the light collecting member 110 collects the diffused light from the light diffusion member 100 toward a display unit 400 .
  • the liquid crystal display device 1000 includes a lower mold frame 200 and an upper mold frame 300 .
  • the lower mold frame 200 includes two or more lower mold frame members 210 , 220 , 230 , and 240 and the lower mold frame members 210 , 220 , 230 , and 240 are combined to form a rectangular frame shape.
  • a plurality of lamps 52 are received in parallel and within a stepped portion formed on the lower mold frame 200 .
  • the light diffusion member 100 , the light collecting member 110 , and the passivation layer 120 are placed on the stepped portion of the lower mold frame 200 .
  • the upper mold frame 300 is placed on the passivation layer 120 .
  • the upper mold frame 300 has a rectangular shape and presses the light diffusion member 100 , the light collecting member 110 , and the passivation layer 120 towards the lower mold frame 200 .
  • the liquid crystal display panel 410 is placed on the upper mold frame 300 for a stable support.
  • a top chassis 700 is provided on the liquid crystal display panel 410 .
  • the light diffusing body 10 of the light diffusion member 100 of the liquid crystal display device 1000 may include either the polymer mixture prepared as described with respect to Embodiment 1 or the copolymer prepared as described with respect to Embodiment 2.
  • a conventional light diffusing body was used as Comparative Example 1.
  • the light diffusing body included a diffusion plate having a thickness of about 2 mm and comprised PMMA and a diffusing sheet formed by coating PMMA beads on a base matrix formed using PET.
  • HAZE VALUE (diffused and transmitted amount of light/total transmitted amount of light) ⁇ 100 [Equation 2] TABLE 1 Item Example 1 Comparative Example 1 Haze value (%) 93.3 93.4 Transparency (%) 62.76 47.99 Diffraction degree (%) 58.56 58.26 Straight light ratio (%) 4.2 3.17
  • the light diffusion member of the present invention exhibits similar optical characteristics when compared with PMMA and even better result for the transparency and diffraction degree.
  • FIG. 4 is a graph illustrating an exemplary embodiment of the change in elastic modulus of PET/PC polymer mixture with respect to the temperature according to the present invention.
  • the light diffusing body 10 including the PET/PC polymer mixture prepared by Example 1 was used.
  • the diffusing plate manufactured by Comparative Example 1 was used.
  • the elastic modulus was measured using a dynamic mechanical thermal analyzer (vibration number 1 hz, strain 1%).
  • the bending stiffness of a material is proportional to Et 3 of a plate-shaped structure, where E represents the elastic modulus of a material and t represents the thickness of the material. Accordingly, as the thickness and elastic modulus decrease, the stiffness also decreases. When the stiffness is small, not much force is applied when contacting with the display panel 410 of the liquid crystal display device 1000 , thereby reducing the generation of strain on the panel.
  • FIG. 5 is a graph illustrating an exemplary embodiment of the change of a glass transition temperature T g of a PET/PC polymer mixture in the light diffusing body 10 with respect to PET weight fraction according to the present invention.
  • the glass transition temperature T g of the PET/PC polymer mixture decreases as the amount of PET increases.
  • the humidity absorbance increases, however, the deformation due to external heat becomes easier. Therefore, the preferred amount of PET is about 20% by weight.
  • the glass transition temperature T g of the polymer mixture is about 116° C. when the amount of PET is 20%. This temperature is higher than the glass transition temperature of PMMA, about 106° C. Therefore, the heat resistance of the light diffusing body 10 of the present invention is better than that of the conventional light diffusing plate.
  • FIG. 6 is a graph illustrating an exemplary embodiment of a heat absorbing amount of a PET/PC polymer mixture in the light diffusing body 10 according to the present invention.
  • the light diffusing body 10 including a PET/PC polymer mixture prepared by Example 1 was used.
  • the PMMA light diffusing plate manufactured by the Comparative Example 1 was used.
  • the temperature of the point of inflection for PMMA was about 109.2° C. and that of the PET/PC polymer mixture was about 117.6° C.
  • the temperature of the point of inflection corresponds to the glass transition temperature T g of each material.
  • the light diffusion member 100 of the present invention includes the components in one body, such as one body formed in a solitary unit. Therefore, the efficiency of the manufacturing process is improved and the manufacturing cost is lowered.
  • the light diffusion member of the present invention is thinner than the conventional light diffusing plate, the manufacturing of a thinner liquid crystal display device can be accomplished. Also, the light transparency is good and the luminance can be improved.
  • the light diffusion member of the present invention has a good durability with respect to heat or humidity.
  • the deformation thereof due to heat is rarely generated. Accordingly, the wrinkling phenomenon exhibited by the conventional diffusing sheet can be effectively prevented.

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TWI379106B (en) 2012-12-11
US8268441B2 (en) 2012-09-18
CN1769976A (zh) 2006-05-10
CN100514142C (zh) 2009-07-15
TW200626970A (en) 2006-08-01
US20110176088A1 (en) 2011-07-21
KR101095631B1 (ko) 2011-12-19
JP2006133717A (ja) 2006-05-25
JP4890768B2 (ja) 2012-03-07
KR20060040485A (ko) 2006-05-10

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