WO2004034136A1 - Bulk diffuser for flat panel display - Google Patents

Bulk diffuser for flat panel display Download PDF

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Publication number
WO2004034136A1
WO2004034136A1 PCT/US2003/024843 US0324843W WO2004034136A1 WO 2004034136 A1 WO2004034136 A1 WO 2004034136A1 US 0324843 W US0324843 W US 0324843W WO 2004034136 A1 WO2004034136 A1 WO 2004034136A1
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WO
WIPO (PCT)
Prior art keywords
set forth
light
poly
diffusing particles
display device
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/US2003/024843
Other languages
English (en)
French (fr)
Inventor
John F. Graf
Eugene G. Olczak
Grant Hay
Ramesh Hariharan
Philippe Schottland
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to EP03808056A priority Critical patent/EP1549996B1/en
Priority to DE60330261T priority patent/DE60330261D1/de
Priority to AU2003259067A priority patent/AU2003259067A1/en
Priority to AT03808056T priority patent/ATE449980T1/de
Priority to CA002501163A priority patent/CA2501163A1/en
Priority to JP2004543236A priority patent/JP2006502442A/ja
Publication of WO2004034136A1 publication Critical patent/WO2004034136A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • 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
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C08L83/06—Polysiloxanes containing silicon bound to oxygen-containing groups
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/007—Incandescent lamp or gas discharge lamp
    • G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube

Definitions

  • This invention relates to optical sheet material and, more specifically, to such sheet material characterized by bulk diffusion of light.
  • optical films or sheet material are commonly used to direct, diffuse or polarize light.
  • brightness enhancement films use prismatic structures on the surfaces thereof to direct light along a viewing axis (i.e., an axis normal to the display). This enhances the brightness of the light viewed by the user of the display and allows the system to consume less power in creating a desired level of on-axis illumination.
  • Such films can also be used in a wide range of other optical designs, such as in projection displays, traffic signals, and illuminated signs.
  • diffusing components In cunent displays systems, for example in Liquid Crystal Displays (LCD), it is desirable to have diffusing components.
  • diffusing components include (but are not limited to) masking artifacts, such as seeing electronic components located behind the diffuser film, improved uniformity in illumination and increased viewing angle.
  • diffusing components include (but are not limited to) masking artifacts, such as seeing electronic components located behind the diffuser film, improved uniformity in illumination and increased viewing angle.
  • diffusion of light is introduced into the backlight assembly by adding separate films (i.e., a stack) that are comprised of a non-diffusing substrate to which a highly irregular, diffusing surface treatment is applied or attached. It is thus desirable to generate diffuse light with out the added cost of separate films.
  • the invention features a bulk light diffuser material.
  • the bulk light diffuser material comprises about 95 to about 99.8 percent by weight of polycarbonate and about 0.2 to about 2.5 percent by weight of a particulate light diffusing component, based on the total weight of the polycarbonate and the light diffusing particles.
  • the sheet material has a percent transmittance of at least 70% and a haze of at least 10% measured according to the American Society for Testing and Materials (ASTM) standard D 1003.
  • a backlight display device comprises an optical source for generating light; a light guide for guiding the light therealong including a reflective surface for reflecting the light out of the light guide; and the aforesaid bulk light diffuser material as a sheet material receptive of the light from the reflective surface.
  • FIGURE 1 is a cross sectional view of a backlight display device including an optical substrate or optical sheet material.
  • FIGURE 2 is a graphical representation of two particle size distributions of light diffusing particles introduced into an optical substrate or optical sheet material.
  • FIGURE 3 is a graphical representation of the theoretical transmission of light through a polycarbonate film or optical sheet material with diffuser particles introduced thereto according to the particle size distributions of Figure 2, as a function of scattering angle as compared to prior art polycarbonate film.
  • FIGURE 4 is a cross sectional view of an optical substrate or optical sheet material receptive of light and diffusing the light emanating therefrom.
  • FIGURE 5 is a graphical representation of experimental results of the predicted transmission of light vs the measured transmission of light for PMMA and TOSPEARL® particles distributed in a polycarbonate film or optical sheet material.
  • FIGURE 6 is a graphical representation of experimental results of the predicted haze vs the measured haze for PMMA and TOSPEARL® particles distributed in a polycarbonate film or optical sheet material.
  • FIGURE 7 is a graphical representation of the measured percent transmission of light vs the measured percent haze for matte surface and polished surface PMMA and polished surface TOSPEARL®) particles distributed in a polycarbonate film or optical sheet material.
  • FIGURE 8 is a cross sectional view of an optical substrate having prismatic structures of the surface thereof.
  • FIGURE 9 is a graphical representation of the measured percent transmission of light vs the measured percent haze for PMMA and TOSPEARL® particles distributed in a polycarbonate film or optical sheet material according to particle concentration and mean diameter size.
  • FIGURE 10 is a three dimensional view of a backlight display device including a stack of optical substrates.
  • FIGURE 11 is a three dimensional view of optical substrates oriented such that the direction of prismatic surfaces thereon are positioned at an angle with respect to one another.
  • FIG. 1 a perspective view of a backlight display 100 device is shown.
  • the backlight display device 100 comprises an optical source 102 for generating light 116.
  • a light guide 104 guides the light 116 therealong by total internal reflection.
  • a reflective device 106 positioned along the light guide 104 reflects the light 116 out of the light guide 104.
  • a first optical substrate 108 positioned above the light guide 104 is receptive of the light 116 from the light guide 104.
  • the first optical substrate 108 comprises, on one side thereof, a planar surface 110 and on a second, opposing side thereof, a prismatic surface 112 (Fig. 8) or may comprise opposing planar surfaces 110 or opposing prismatic surfaces 112.
  • the opposing surfaces may also include a matte finish, for example a surface replicated from a sand blasted, laser machined, milled or electric discharged machine master as well as the planar and prismatic surfaces.
  • the first optical substrate 108 is receptive of the light 116 and acts to turn the light 1 16 in a direction that is substantially nonnal to the first optical substrate 108 along a direction z as shown.
  • the light 116 is then directed to a second optical substrate 114 located above the first optical substrate 108 to provide diffusion of the light 116.
  • the second optical substrate 114 which may be sheet material, is receptive of the light 116 from the first optical substrate 108.
  • the light 116 proceeds from the second optical substrate 114 to a liquid crystal display (LCD) 130 (Fig. 10).
  • LCD liquid crystal display
  • the backlight display device 100 may include a plurality of optical substrates 108, 114 ananged in a stack as shown.
  • the prismatic surfaces 112 of the optical substrates 108 may be oriented such that the direction of the prismatic surfaces 112 are positioned at an angle with respect to one another, e.g., 90 degrees (Fig. 1 1).
  • the prismatic surfaces 112 of the optical substrates 108 have a peak angle, ⁇ , a height, h, a pitch, p, and a length, / which may have prescribed values or may have values which are randomized or at least psuedo-randomized.
  • Haze is the scattering or diffusion of light as light passes through a transparent material. Haze can be inherent in the material, a result of a formation or molding process, or a result of surface texture (e.g., prismatic surfaces).
  • the light diffusing particles 128 may be round or irregular in shape, and have a refractive index different from that of the second optical substrate 114. Typical refractive indices of the light diffusing particles 128 are in the range of about 1.4 to about 1.7 and that of the second optical substrate 114 in the range of about 1.45 to about 1.65.
  • the light diffusing particles 128 may be randomly, or at least pseudo-randomly, distributed or oriented in the optical substrate 114, or may be aligned in some deterministic fashion.
  • Suitable light diffusing particles may comprise organic or inorganic materials, or mixtures thereof, and do not significantly adversely affect the physical properties desired in the polycarbonate, for example impact strength or tensile strength.
  • suitable light diffusing organic materials include poly(acrylates); poly(alkyl methacrylates), for example poly(methyl methacrylate) (PMMA); poly(tetrafluoroethylene) (PTFE); silicones, for example hydrolyzed poly(alkyl trialkoxysilanes) available under the trade name TOSPEARL® from GE Silicones; and mixtures comprising at least one of the foregoing organic materials, wherein the alkyl groups have from one to about twelve carbon atoms.
  • suitable light diffusing inorganic materials include materials comprising antimony, titanium, barium, and zinc, for example the oxides or sulfides of the foregoing such as zinc oxide, antimony oxide and mixtures comprising at least one of the foregoing inorganic materials.
  • Figure 2 shows two light diffusing particle size distributions 118a, 118b wherein the frequency of the light diffusing particles is a function of particle diameter (or some characteristic dimension).
  • the average particle size is 2.4 micrometers with a standard deviation of 500.
  • the average particle size is 4.5 micrometers with a standard deviation of 500.
  • Figure 3 shows a graphical representation of the theoretical transmission of light 120, 122 (luminance in Cd/m 2 ) at 560 nm through a 0.127 mm thick polycarbonate film with light diffusing particles, having a refractive index of 1.49, and a concentration of 1.8% (122) and 1.5% (120) introduced thereinto according to the particle size distributions of Figure 2, as a function of scattering angle, as compared to the actual transmission of light 124, 126 through two prior art polycarbonate films.
  • a proper refractive index, mean particle size and particle concentration a transmission can be found that substantially follows that of actual transmission.
  • Table 1 shows data for two types of light diffusing particles suspended in a 0.178mm thick polycarbonate film with a refractive index of 1.59. Typical films are about 0.025 to 0.5mm in thickness but could be thicker or thinner if the application required it.
  • the first light diffusing particle is a polymer comprised of poly(methyl methacrylate)
  • the second is a polymer comprising hydrolyzed poly(alkyl trialkoxysilane), or a mixture thereof, where "alkyl” is defined as C ⁇ -Cj alkyl, preferably methyl.
  • Figure 7 is a graphical representation of the experimental measured percent transmission of light through a polycarbonate film relative to their measured percent haze thereof for matte surface ( ⁇ ) and polished surface ( ⁇ ) PMMA particles and polished surface (o) TOSPEARL® particles distributed in the polycarbonate film.
  • the refractive index difference between the polycarbonate film and the PMMA particles is about 0.1, which is optimum for high haze and high transmission values.
  • the refractive index difference between the polycarbonate film and the TOSPEARL® particles is about 0.16 which is larger than that between PMMA and the polycarbonate, leading to lower transmissions for the high haze samples
  • Figure 7 several of the PMMA particles (both matte and polished surfaces) show a transmission of greater than 90%) and a haze of greater than 80% by controlling the particle concentration, while no TOSPEARL® particles have a transmission of greater than 90%) even for particles with a haze of greater than 80%> even by controlling particle concentration.
  • Figure 7 also shows data indicating PMMA polished and silicone polished particles having a transmittance of about 91%> and a haze of about 15%).
  • the aforesaid matte and polished surfaces are defined by gloss values according to ASTM standard D523 where the polished surface has a gloss value of over 90 and a matte surface has a gloss value of under 50.
  • Figure 9 is a graphical representation of the measured percent transmission of light through a 0.178 mm thick polycarbonate film vs the measured percent haze thereof for PMMA and TOSPEARL® particles distributed in a polycarbonate film or optical sheet material according to particle concentration and mean diameter size.
  • PMMA particles by increasing the particle concentration from 0.2%> to 2.2%, while maintaining the mean particle size at either 2.4 micrometers or 5.0 micrometers, the transmission increased, or only decreased slightly, with an increase in haze.
  • a PMMA particle concentration of 2.2% and a mean particle size of 2.4 micrometers (•), or a PMMA particle concentration of 2.2% and 5.0 micrometers (A) possesses a measured haze of greater than 80%> and a measured transmission of greater than 90%>.
  • TOSPEARL® particles by increasing the particle concentration from 0.2% to 2.2%, while maintaining the mean particle size at either 2.0 micrometers or 4.5 micrometers, the transmission decreased, even though there was an increase in haze.
  • a TOSPEARL® particle concentration of 2.2%> and a mean particle size of 4.5 micrometers ( ⁇ ) possesses a measured haze of greater than 80%) though still possessing a measured transmission of greater than 89%.
  • FIG. 9 Also seen in Figure 9 is data indicating a TOSPEARL® concentration of about 0.2% and a 4.5 micrometer size having a haze of about 15% and a transmittance of about 91% > , as well as a PMMA concentration of 0.2%> and 5.0 micrometer size having a haze of about 17% and a transmittance of about 91%>.
  • Figures 7 and 9 thus show that PMMA particles (with both matte and polished surfaces) suspended in a polycarbonate film at a selected particle concentration of about 2.2%o and a mean particle size of either 2.4 micrometers or 5.0 micrometers are a good candidate for effecting the necessary light diffusion properties in display devices.
  • a bulk light diffuser as a polycarbonate film or optical sheet material or optical substrate comprising about 95 to about 99.8 percent by weight of a polycarbonate and about 0.2 to about 5 percent by weight of light diffusing particles, based on the total weight of the polycarbonate and the light diffusing particles.
  • Other components may be present in the polycarbonate compositions in minor amounts, as long as such components do not adversely affect the physical properties of the composition, such that the bulk light diffuser consists essentially of the polycarbonate and the light diffusing particles.
  • the light diffusing particles comprise a polymer selected from the group consisting of poly(methyl methacrylate), hydrolyzed poly(methyl trialkoxysilane), and mixtures thereof.
  • the sheet material has a percent transmittance of at least 70% and a haze of at least 10% measured according to ASTM standard D 1003-00.
  • the description of the invention herein discloses a polymer particle concentration p, a sheet material thickness, t, and a mean particle size, s, to achieve a preferred sheet material having optical properties of at least 70% transmission and at least 10% haze, a more preferred sheet material having optical properties of at least 90% transmission and at least 80% haze, and a most preferred sheet material having optical properties of at least 90%> transmission and at least 90% haze, for a polymer such as a poly(acrylate), a poly(alkyl methacrylate), a hydrolyzed poly(alkyl trialkoxysilane), or a mixture thereof, wherein alkyl is defined as C ⁇ -C ⁇ 2 alkyl, and the particles are suspended within a polycarbonate.
  • Embodiments of the bulk light diffuser material as a polycarbonate film or optical sheet material have been described with respect to backlight displays or the like. Such bulk diffusion may also be attained by adding the light diffusion particles to either the upper or lower substrate containing liquid crystal material, or both in an LCD. This can result in increased view angle and decreased artifacts from pixel boundaries.
  • the bulk diffusion of light may also be accomplished by adding the light diffusion particles to the reflective surface 106 positioned along the light guide 104 or to the light guide 104 in an edge-lit backlight or frontlight assembly.
  • the optical sheet material can replace surface texture type of diffusers in existing backlight devices or may be included in such diffusers as well as in brightness enhancement films or light turning films.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)
  • Burglar Alarm Systems (AREA)
  • Switches With Compound Operations (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Planar Illumination Modules (AREA)
PCT/US2003/024843 2002-10-03 2003-07-29 Bulk diffuser for flat panel display Ceased WO2004034136A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP03808056A EP1549996B1 (en) 2002-10-03 2003-07-29 Bulk diffuser for flat panel display
DE60330261T DE60330261D1 (de) 2002-10-03 2003-07-29 Streukörper für flachbildschirmanzeigen
AU2003259067A AU2003259067A1 (en) 2002-10-03 2003-07-29 Bulk diffuser for flat panel display
AT03808056T ATE449980T1 (de) 2002-10-03 2003-07-29 Streukörper für flachbildschirmanzeigen
CA002501163A CA2501163A1 (en) 2002-10-03 2003-07-29 Bulk diffuser for flat panel display
JP2004543236A JP2006502442A (ja) 2002-10-03 2003-07-29 フラットパネルディスプレイ用バルクディフューザー

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/065,319 2002-10-03
US10/065,319 US6908202B2 (en) 2002-10-03 2002-10-03 Bulk diffuser for flat panel display

Publications (1)

Publication Number Publication Date
WO2004034136A1 true WO2004034136A1 (en) 2004-04-22

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ATE449980T1 (de) 2009-12-15
KR20050073474A (ko) 2005-07-13
KR100989965B1 (ko) 2010-10-26
JP2006502442A (ja) 2006-01-19
AU2003259067A1 (en) 2004-05-04
CA2501163A1 (en) 2004-04-22
US20040066645A1 (en) 2004-04-08
EP1549996B1 (en) 2009-11-25
DE60330261D1 (de) 2010-01-07
EP1549996A1 (en) 2005-07-06
US6908202B2 (en) 2005-06-21
CN1703651A (zh) 2005-11-30

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