WO2004097468A1 - 液晶ディスプレイ用反射シート及びその製造方法、ならびにこの反射シートを用いたバックライトユニット - Google Patents
液晶ディスプレイ用反射シート及びその製造方法、ならびにこの反射シートを用いたバックライトユニット Download PDFInfo
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- WO2004097468A1 WO2004097468A1 PCT/JP2004/006084 JP2004006084W WO2004097468A1 WO 2004097468 A1 WO2004097468 A1 WO 2004097468A1 JP 2004006084 W JP2004006084 W JP 2004006084W WO 2004097468 A1 WO2004097468 A1 WO 2004097468A1
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- liquid crystal
- crystal display
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- parts
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Classifications
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0808—Mirrors having a single reflecting layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
- G02B5/085—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal
- G02B5/0858—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal the reflecting layers comprising a single metallic layer with one or more dielectric layers
- G02B5/0866—Multilayer mirrors, i.e. having two or more reflecting layers at least one of the reflecting layers comprising metal the reflecting layers comprising a single metallic layer with one or more dielectric layers incorporating one or more organic, e.g. polymeric layers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector
Definitions
- the present invention relates to a reflection sheet for a liquid crystal display, and more particularly to a reflection sheet for a liquid crystal display used for a reflection plate of a liquid crystal display, a reflection plate of various lighting equipment and the like.
- light sources such as cold cathode tubes and white LEDs are arranged along the edge of the light guide plate.
- a part of the light emitted from the light source is directly guided to the light guide plate, and the remaining light is reflected by the reflector disposed around the light source and guided to the light guide plate.
- the light guided to the light guide plate is reflected by the light diffusion layer printed on the back surface of the light guide plate in a halftone pattern and emitted from the light guide plate surface (illumination surface) to the liquid crystal panel side.
- the rear surface of the light guide plate is devised so that light can be reflected uniformly.
- the light leaked from the light guide plate is reflected by a reflection sheet provided on the back surface side of the light guide plate and exits from the surface of the light guide plate.
- a reflection sheet provided on the back surface side of the light guide plate and exits from the surface of the light guide plate.
- the reflection sheet has high reflection efficiency and high luminance.
- a porous white polyester film is known as a reflection sheet, but this reflection sheet has a thickness of 188 m, so it could not be incorporated into a small liquid crystal display. Attempting to reduce the thickness of this reflective sheet reduced the reflective performance. Therefore, this reflection sheet could not be used for a small liquid crystal display.
- JP-A-5-162227 discloses a reflector in which a metal thin film is laminated on one side of a flexible substrate. Since the specular reflection of metal is used, there is a problem that luminance unevenness and bright lines are easily generated. In addition, this reflector has a disadvantage that the reflection characteristic of a wavelength near 465 nm, which has the highest relative light intensity among the white LED emission spectrum, is poor.
- Japanese Patent Publication No. 8-183939 discloses a white reflective layer containing titanium oxide or the like provided on a thin Ag film via a barrier layer.
- JP-A-5-310329 discloses a light reflection coating in which a resin containing a white pigment is applied to the other surface of a plastic film on which a metal thin film is laminated. Sheets are disclosed. These films and sheets have the property that the white pigment itself absorbs a specific wavelength. In particular, light at the lower wavelength side, for example, 400 ⁇ ! It was difficult to efficiently reflect light of up to 500 nm.
- Japanese Patent Application Laid-Open No. Hei 9-63329 / 29 discloses a resin binder comprising a (meth) acrylate copolymer which is provided with a reflective property by providing a resin layer containing hollow particles.
- a reflective material in which a reflective coating obtained by mixing hollow particles with a reflective material is laminated on a support such as a resin film, but does not have sufficient reflective performance.
- Japanese Patent Application Laid-Open No. Hei 2-1 9 6 8 3 8 The gazette discloses a reflective screen in which hollow polymer particles are arranged on a surface of a substrate via an adhesive, and a light reflection layer is provided so as to protrude from the outermost surface. Have been. Disclosure of the invention
- the present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a reflective sheet which does not generate a luminance spot and a bright line, has good reflection characteristics, and has a small thickness of the entire sheet and is small in size.
- An object of the present invention is to provide a reflection sheet that can be used for a liquid crystal display.
- the reflection sheet for a liquid crystal display of the present invention has a layer containing hollow particles in a binder resin and a metal thin film, and the content of the hollow particles is 100 to 100 parts by mass of the binder resin. Not less than 800 parts by mass and not more than 800 parts by mass, and the thickness of the entire sheet is not more than 150 ⁇ m.
- it may have a transparent resin sheet.
- the transmittance of the binder resin was measured at 23 ° C. on a film having a thickness of 50 ⁇ m.
- the wavelength was 400 ⁇ ! 2.
- the metal thin film preferably contains silver as a main component.
- the method for producing a reflective sheet for a liquid crystal display comprises the step of: providing one side of the transparent resin sheet with 100 parts by mass or more of hollow particles and 100 parts by mass or less of 100 parts by mass Form a layer containing in the range And a metal thin film is formed on one surface of the support to produce a base material B, and thereafter, the base material A and the base material B are laminated.
- the backlight unit according to the present invention includes any one of the above-described reflective sheets for a liquid crystal display, or a reflective sheet for a liquid crystal display obtained by a method of manufacturing the above-described reflective sheet for a liquid crystal display. .
- the reflective sheet for liquid crystal displays and a wavelength 4 0 0 11 1 1 1-5 0 0 average reflectance at nm is 90% or more and wavelength 4 0 0 n • m to 7 0 0 nm mean According reflectance is 90% or more is preferred c present invention in, without causing luminance spots and bright lines, has good reflective properties, and a small liquid crystal display with thin thickness of the entire sheet Thus, it is possible to provide a reflection sheet that can be used for a vehicle.
- FIG. 1 is a cross-sectional view showing a layer configuration of an example of an embodiment of the reflection sheet of the present invention. .
- FIG. 2 is a schematic sectional view showing an example of the embodiment of the pack light unit according to the present invention.
- FIG. 3 is a sectional view showing a schematic configuration of a TFT LCD monitor. BEST MODE FOR CARRYING OUT THE INVENTION
- the reflecting sheet of the present invention has a layer containing hollow particles and a metal thin film.
- the layer containing hollow particles contains hollow particles in Pinda resin, and the hollow particles have an outer diameter of particles. There about 0. 0 5 is intended preferably 111 to about 1 0 1 1 1. Hollow particle outer diameter less than about 0.05 in It is difficult to form fine particles by an emulsion polymerization method, and when hollow particles having an outer diameter of less than about 0.05 ⁇ m are used, light scattering is low and luminance is liable to be low. When hollow particles with an outer diameter of more than about 10 m are used, the light is not emitted unless the shape has many small holes in the particle (unless it is a single spherical hollow hole).
- the ratio outer particle diameter of the particles inside diameter of the hollow particles is from 0.2 to 0. it is preferable 9 in the range of. If this ratio is less than 0.2, the ratio of vacancies in the layer containing the hollow particles becomes small, so that the luminance may decrease. If this ratio is greater than 0.9, the strength of the hollow particles is reduced, and when dried, the hollow particles cannot maintain the spherical shape and exhibit a distorted shape or the hollow particles are broken. And the brightness may decrease.
- the hollow particles preferably used in the present invention may be made of an organic material or an inorganic material.
- the organic hollow particles made of an organic material include those obtained by emulsion polymerization or suspension polymerization of an atalyl monomer or a styrene monomer.
- Such organic hollow particles can be produced by a known method, and are described in, for example, Japanese Patent Application Laid-Open Nos. Sho 62-127336 and Japanese Patent Publication No. 3-91124. It can be manufactured by a method.
- the amount of the hollow particles added is 100 to 800 parts by mass with respect to 100 parts by mass of the binder. And it is preferably from 100 to 500 parts by mass, more preferably from 200 to 500 parts by mass. If the amount of the hollow particles is less than 100 parts by mass, the brightness tends to be low, and if it is more than 800 parts by mass, the layer containing the hollow particles tends to be poor in film forming property, so that it is brittle. Layers may be formed.
- the binder resin used in the present invention include polyester, polyurethane, acrylic resin, polyacetate biel, silicone resin, fluororesin, and copolymers thereof.
- the binder resin used in the present invention preferably has a glass transition temperature (T g) of not more than o ° c. If the glass transition temperature is higher than o ° c, the layer containing the hollow particles may become brittle, and the layer containing the hollow particles may crack due to external force or the like.
- the transmittance of the binder resin affects the luminance. For example, thickness
- the average transmittance of light in a wavelength region of 400 nm to 800 nm is 80% or more when measured at 23 ° C for a film formed on a 50 ⁇ m film. . If the transmittance is less than 80%, the brightness may be reduced. Further, as the binder resin, a resin having excellent film-forming properties and a resin having excellent adhesiveness to a laminated object to be laminated are preferable.
- the thickness of the layer containing the hollow particles is preferably in the range of 5 ⁇ to 10 ⁇ m, more preferably 10 to 60 Xm, and particularly preferably 20 to 50 ⁇ m. It is preferable that If the thickness is less than 5 ⁇ , there may be a problem with the reflection performance.If the thickness is more than 100 ⁇ m, it is necessary to dry the layer containing hollow particles after coating it when forming the layer. The time may be prolonged, the formed layer may be cracked, and it is difficult to achieve the purpose of reducing the thickness of the entire reflecting sheet.
- the layer containing the hollow particles may be provided on the transparent resin sheet to form the base material A, for example, and may be included in the reflection sheet as the base material A.
- the transparent resin sheet examples include polypropylene, polysulfone, Examples of the sheet include nylon, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyethenoresanololefon, polyesterol, poly (meth) acrylate, polycarbonate, or a copolymer of these. It is preferable to select and use as appropriate. Further, the transparent resin sheet may be stretched at least in a uniaxial direction. The biaxially stretched polyethylene terephthalate film is suitable as a transparent resin sheet constituting the base material A from the viewpoint of heat resistance, transparency and cost. In the present invention, a sheet having high transparency and low light absorption is preferable. It is preferable to add a light stabilizer to the transparent resin sheet because the temporal stability of the layer containing the hollow particles is further improved.
- the thickness of the transparent resin sheet is preferably at least 10 m and at most 100 m. If the thickness is less than 10 ⁇ m, wrinkles may occur during handling. On the other hand, if it exceeds 100 inches, it may be difficult to reduce the film thickness or the transparency may be reduced.
- the reflection sheet of the present invention has a metal thin film.
- the metal thin film those containing silver as a main component are preferable, and a thin film of silver alone, a thin film of an alloy of another metal containing silver as a main component, a thin film of laminated silver and another metal, and the like are given.
- the thickness of the metal thin film is preferably at least 300 angstroms in consideration of the decrease in transmitted light, and is preferably at most 300 angstroms from the viewpoint of reflection performance and cost.
- the metal thin film may be formed on a support such as a plastic sheet, for example. That is, the reflective sheet may be included as a base material having a metal thin film formed on a support such as a plastic sheet.
- the metal thin film can be formed on a plastic sheet by using a method such as sputtering, vacuum evaporation, ion plating, and ionization evaporation.
- the plastic sheet used here is, for example, poly Examples include a sheet made of propylene, polyethylene terephthalate, polyethylene naphthalate, polyether sulfone, polyester, poly (meth) atalylate, polycarbonate, or a copolymer thereof. In the present invention, it is preferable to select and use as appropriate. Further, a metal thin film may be formed directly on a plastic sheet, or an undercoating layer may be formed, and a metal thin film may be formed thereon by vapor deposition or the like.
- Silver-based metal thin films have low mechanical strength, are susceptible to damage by friction, and are liable to discolor and corrode.
- a protective layer is formed on the metal thin film. It is preferable to provide them.
- the reflection sheet of the present invention is prepared, for example, by forming a layer containing hollow particles on a transparent resin sheet by coating or the like to produce a substrate A, and by vapor deposition or the like on a support such as a plastic sheet.
- a base material B is prepared by forming a metal thin film, and then manufactured by laminating the base material A and the base material B.
- the layer containing hollow particles and the metal thin film are overlapped so that they are on the inside.
- the layer containing hollow particles and the plastic sheet may be overlapped so that they are on the inside.
- the base material A and the base material B can be bonded together by, for example, dry lamination via an adhesive layer or the like. Examples of the material constituting the adhesive layer include the same materials as those listed as the resin binder above.
- a coating method a known method can be adopted, and examples thereof include a method of coating using a Rhono recorder, a gravure coater, a comma coater, and the like.
- Known devices can be employed for the laminator, the stirrer, and the like.
- the thickness of the reflection sheet is preferably set to not more than 150 m, more preferably from 40 ⁇ m to 120 / im, particularly from 50 ⁇ m to 80 ⁇ m. It is preferably ⁇ m. Liquid crystal displays are becoming thinner and smaller, and it is necessary to reduce the thickness of the reflective sheet to less than 15.5 m because of the space built into the backlight unit.
- the wavelength having the highest relative light intensity is around 465 nm, and the reflection sheet has the wavelength of 450 nm. It is preferable that the average reflectance at a wavelength of 400 nm to 480 nm is 90% or more, and it is more preferable that the average reflectance at a wavelength of 400 to 500 nm is 90% or more.
- a high reflectance in the wavelength range of 400 nm to 500 nm is effective for improving the brightness of the screen.For example, it has been confirmed that only a 1% increase in the reflectance has a very effective effect on improving the brightness. .
- the average reflectance at a wavelength of 400 nm to 700 nm is preferably 90% or more.
- the average reflectance in this wavelength range is less than 90%, sufficient brightness of the screen cannot be obtained.
- FIG. 1 shows a layer configuration of an example of an embodiment of the reflection sheet of the present invention.
- the reflection sheet 1 is composed of a base material A (indicated by reference numeral 7 in FIG. 1) having a layer 3 containing hollow particles under a transparent resin sheet 2 and a metal thin film on a plastic sheet 6.
- a base material B having a reference numeral 5 (indicated by reference numeral 8 in FIG. 1) is bonded via an adhesive layer 4.
- the reflection sheet of the present invention can be assembled with a light guide plate, a diffusion plate, and a light source such as a white LED and a cold cathode tube to form a backlight unit.
- FIG. 2 shows an example of an embodiment of the pack light unit of the present invention.
- the reflection sheet 11 of the present invention is located below the conductor plate 12.
- the diffusion plate 13 is arranged on the conductor plate 12.
- a light source 14 is arranged along the edge of the reflection sheet 11, and a light source reflection plate 15 is incorporated so as to surround the rear of the light source 14.
- the sheet is a thin product defined by JIS, and generally has a small thickness and flatness in place of length and width.
- a film is a thin, flat product whose thickness is extremely small compared to its length and width, and whose maximum thickness is arbitrarily limited, and which is usually supplied in the form of a roll (JISK 6 900). Therefore, it can be said that a film having a particularly small thickness among the sheets is a film. ”, And“ film ”in the case of“ film ”.
- an antioxidant as long as the effects of the present invention are not impaired.
- Light stabilizer, heat stabilizer, lubricant, dispersion j, ultraviolet absorber, white pigment, fluorescent whitening agent, and other additives Agents can be added.
- the reflection sheet for a liquid crystal display of the present invention has a silver-deposited film having a high shielding effect and a hollow particle layer having a high diffuse reflection property, and thus has excellent reflection performance.
- Low wavelength light for example, 40 On ⁇ ! 5500 nm can be efficiently reflected.
- the reflectance when the white barium sulfate white plate was set to 100% was obtained over a wavelength range of 240 nm to 800 nm and 1 nm. Measure at intervals. From the measured values obtained for each 1 nm, the average value for wavelengths of 400 nm to 500 nm is determined, and this value is used as the average reflectance for wavelengths of 400 nm to 500 nm, and the wavelength is 450 ⁇ !
- the average value of the wavelength from 480 nm to 480 nm is calculated, and this value is used as the average reflectance at the wavelength of 450 nm to 48 O nm.
- the average value of ⁇ 700 nm was determined, and this value was used as the average reflectance at wavelengths of 400 nm to 700 nm.
- a reflective sheet was set on a device manufactured by Samsung Corporation "TFT LCD Monitor 17 1 Nm" and illuminated from one end face, and the presence or absence of bright lines and luminance spots was visually observed. confirmed.
- a diffusion plate 23 is disposed on the conductor plate 22, and a liquid crystal panel 26 is disposed thereon.
- a reflection sheet 21 is set below the conductor plate 22 so that light is emitted from a light source 24 arranged at an edge of the conductor plate 22.
- the hollow particles, the binder resin, the transparent resin sheet, and the silver vapor-deposited sheet shown in the examples, those shown below were used.
- Atalyl-styrene hollow particle emulsion “SX866B” J (SR Co., 0.3 m outer diameter)
- Ethylene vinyl acetate “S_200” (Sumitomo Chemical Co., Ltd.)
- G Ethylene monoester “S—950” (Sumitomo Chemical Co., Ltd.)
- a silver-deposited sheet “BL film” (thickness: 25 ⁇ ) manufactured by Oike Industry Co., Ltd. was used.
- Acrylic monostyrene “ ⁇ ⁇ -49 ⁇ ” (manufactured by Soken Chemical Co., Ltd.) was dried on the metallic glossy surface of this silver-deposited sheet using a comma coater so that the thickness after drying became ⁇ ⁇ . It was coated and dried at a temperature of 80 ° C. to form an adhesive layer.
- a layer containing the hollow particles of the base material A was overlaid on the adhesive layer so as to be in contact with each other, and bonded at a temperature of 40 ° C. In this way, a reflection sheet having a total thickness of 95 m was produced.
- the reflectance of the obtained reflection sheet was measured, and the evaluation of the bright line and the luminance were performed. The results are shown in Table 1.
- Example 1 In the preparation of the substrate A in Example 1, as shown in Table 1, the entire thickness was changed in the same manner as in Example 1 except that the thickness of the layer containing hollow particles was changed from 10 ⁇ m to 20 m. A reflection sheet of 105 in was produced. The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1.
- Example 1 In the preparation of the base material A in Example 1, as shown in Table 1, the thickness of the layer containing the hollow particles was changed from 10 ⁇ m to 50 ⁇ m in the same manner as in Example 1. A reflective sheet having a total thickness of 135 ⁇ m was prepared.
- Example 1 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1.
- the reflection sheet was produced in the same manner as in Example 2 except that the content of the hollow particles was changed from 200 parts by mass to 100 parts by mass. Was prepared.
- Example 1 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1.
- Example 6 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1. (Example 6)
- a reflection sheet was produced in the same manner as in Example 2 except that the type of the element was changed from "MH-5055” to "SX866B” (outer diameter 0.3 ⁇ ) manufactured by JSR.
- Example 1 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1.
- Example 2 In the preparation of the substrate ⁇ in Example 2, as shown in Table 1, the type of the hollow particles was changed from “MH—555” to “HP—43J” manufactured by Rohm & Haas Japan Co., Ltd. A reflection sheet was produced in the same manner as in Example 2 except that the outer diameter was changed to 0.4 m).
- Example 8 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1. (Example 8)
- Example 2 In the production of the base material A in Example 2, as shown in Table 1, the type of the binder resin of the layer containing the hollow particles was changed from “AN_49B” to the polyester polyurethane “Nichika Chemical Co., Ltd.” A reflection sheet was produced in the same manner as in Example 2, except that the sheet was changed to Neo Sticker 400.
- Example 1 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1.
- Acrylic-styrene hollow particle emulsion “MH-5505” (manufactured by Zeon Corporation) and acrylic-styrene “AN-149B” (manufactured by Soken Chemical Co., Ltd.) as a binder resin are hollow particles. Solid content is binder.
- the fat was mixed in an amount of 200 parts by mass with respect to 100 parts by mass, and mixed with a stirrer for 5 minutes.
- a silver-deposited sheet “BL film” (thickness: 25 ⁇ ) manufactured by Oike Industry Co., Ltd. was used.
- the prepared mixture for forming the hollow particle layer was coated on the metallic glossy surface of the silver-deposited sheet so that the thickness after drying was 20 m, and the temperature was adjusted to 80 m. Dried at ° C.
- a reflective sheet having a total thickness of 45 ⁇ m was prepared.
- Example 1 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 1.
- a reflection sheet was produced in the same manner as in Example 9, except that the blending amount of the hollow particles was changed to 400 parts by mass.
- Example 2 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 2.
- a reflection sheet was produced in the same manner as in Example 9, except that the blending amount of the hollow particles was changed to 400 parts by mass and the thickness of the hollow particle layer was changed to 40 ⁇ . .
- Example 2 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 2.
- Example 2 In the preparation of the substrate ⁇ ⁇ in Example 2, as shown in Table 2, the type of binder resin of the layer containing the hollow particles was changed from “AN-49B” to Sumitomo Chemical. A reflecting sheet having a total thickness of 105 ⁇ m was produced in the same manner as in Example 2 except that ethylene-butyl acetate “S—200” manufactured by Gaku Kogyo Co., Ltd. was changed. The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 2.
- Example 2 In the preparation of the base material A in Example 2, as shown in Table 2, the type of binder resin in the layer containing hollow particles was changed from “AN-49B” to ethylene monohydrate manufactured by Sumitomo Chemical Co., Ltd. A reflection sheet was produced in the same manner as in Example 2, except that the special ester was changed to “S-950”.
- Example 2 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 2.
- Example 2 In the preparation of the base material A in Example 2, as shown in Table 2, the type of the binder resin of the layer containing the hollow particles was changed from “AN-49B” to a product of Nissin Chemical Co., Ltd. A reflection sheet was produced in the same manner as in Example 2 except that the vinyl acetate was changed to “4485 LL”.
- Example 2 The same measurement and evaluation as in Example 1 were performed on the obtained reflection sheet. The results are shown in Table 2.
- Example 3 In the preparation of the base material A in Example 1, as shown in Table 3, a layer having a total thickness of 9 was formed in the same manner as in Example 1 except that a layer was formed without adding hollow particles as a layer containing hollow particles. A reflection sheet of 5 ⁇ m was produced.
- Example 1 In the preparation of the base material A in Example 1, as shown in Table 3, except that the content of the hollow particles was changed to 50 parts by mass, the reflection having a total thickness of 95 ⁇ m was performed in the same manner as in Example 1. A sheet was prepared.
- a reflection sheet was produced in the same manner as in Example 9 except that the content of the hollow particles was changed to 900 parts by mass in the production of the base material A in Example 9, and the sheet was cut into a predetermined size. At that time, powder fell off, and it could not be put to practical use as a reflection sheet.
- Example 1 In the preparation of the base material A in Example 1, a reflective sheet having a total thickness of 85 ⁇ was prepared in the same manner as in Example 1 except that a layer containing hollow particles was not provided, as shown in Table 3. did.
- a silver vapor-deposited sheet “: BL film” 25 ⁇ m thick
- Oike Industry Co., Ltd. was used as a reflective sheet.
- a white porous sheet “E60L” (having a thickness of 188 ⁇ m) manufactured by Toray Industries, Inc. was used.
- Titanium oxide (“R—21” manufactured by Sakai Chemical Co., Ltd.) and polyester polyurethane “Neo Sticker 400” (manufactured by Nika Chemical Co., Ltd.) as the binder resin
- the resin was blended in an amount of 50 parts by mass with respect to 100 parts by mass and mixed with a stirrer for 5 minutes.
- This was mixed with a transparent polyethylene terephthalate finolem having a thickness of 50 Azm “T6 0 E50 ”(manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.) using a comma coater so that the thickness after drying is 20 m, and the temperature is 80 ° C. After drying with, it was rolled up.
- base material B a silver-deposited sheet “BL film” (thickness: 25 ⁇ ⁇ ) manufactured by Oike Industry Co., Ltd. was used.
- Acryl-styrene “ ⁇ ⁇ -49 ⁇ ” (manufactured by Soken Chemical Co., Ltd.) was dried on the metallic glossy surface of this silver-deposited sheet using a comma coater to a thickness of 10 m. And dried at a temperature of 80 ° C. to form an adhesive layer.
- the titanium oxide-containing layer of the base material A was overlaid on the adhesive layer so as to be in contact with the adhesive layer, and bonded at a temperature of 40 ° C.
- a reflection sheet having a total thickness of 105 m was produced.
- the reflective films for liquid crystal displays of Examples 1 to 14 of the present invention have an average reflectance at a wavelength of 400 nm to 500 nm. Is 90% or more, the average reflectance at a wavelength of 450 nm to 480 nm is 90% or more, and the average reflectance at a wavelength of 400 nm to 700 nm is 90%. It turns out that it is above. Further, no bright line and no uneven brightness were observed.
- Comparative Examples 1, 3, and 4 in which the layer containing the hollow particles was not provided, Long Average reflectance of 400 nm to 500 nm is less than 90%, Average reflectance of wavelengths 450 nm to 480 nm is less than 90%, and bright line and brightness Spots were observed. Comparative Example 2 has a wavelength of 400 ⁇ ! It was found that the average reflectance was 50 O nm, and the wavelength was 450-480 nm, and the average reflectance was less than 90%.
- the existing white porous sheet which is a reflective sheet, has a thickness of more than 150 ⁇ m, so it could not be used for thin liquid crystal displays.
- Comparative Example 6 in which a layer containing titanium oxide was provided instead of the hollow particles, had a wavelength of 400 ⁇ ⁇ ! The average reflectance at ⁇ 500 nm was found to be less than 90%.
- the present invention can be used in, for example, an image device or a combiner that transmits image data and audio data.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
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Abstract
Description
Claims
Priority Applications (1)
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JP2005505917A JPWO2004097468A1 (ja) | 2003-04-28 | 2004-04-27 | 液晶ディスプレイ用反射シート及びその製造方法、ならびにこの反射シートを用いたバックライトユニット |
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JP2003-123525 | 2003-04-28 | ||
JP2003123525 | 2003-04-28 |
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WO2004097468A1 true WO2004097468A1 (ja) | 2004-11-11 |
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PCT/JP2004/006084 WO2004097468A1 (ja) | 2003-04-28 | 2004-04-27 | 液晶ディスプレイ用反射シート及びその製造方法、ならびにこの反射シートを用いたバックライトユニット |
Country Status (5)
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JP (1) | JPWO2004097468A1 (ja) |
KR (1) | KR20060003901A (ja) |
CN (1) | CN1781035A (ja) |
TW (1) | TW200502091A (ja) |
WO (1) | WO2004097468A1 (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007037093A1 (ja) * | 2005-09-29 | 2007-04-05 | Idemitsu Kosan Co., Ltd. | 反射材及び発光ダイオード用反射体 |
JP2008231231A (ja) * | 2007-03-20 | 2008-10-02 | Idemitsu Kosan Co Ltd | 光半導体用反射材 |
JP2008243892A (ja) * | 2007-03-26 | 2008-10-09 | Idemitsu Kosan Co Ltd | 光半導体用反射材 |
JP2010128087A (ja) * | 2008-11-26 | 2010-06-10 | Mitsubishi Plastics Inc | 光学フィルムおよび光学フィルム積層金属体 |
US7883768B2 (en) * | 2007-04-25 | 2011-02-08 | Beijing Boe Optoelectronics Technology Co., Ltd. | Backlight module, diffusion plate and method of manufacturing the same |
EP3936761A1 (en) * | 2020-07-07 | 2022-01-12 | Kolonglotech. Inc | Flat lighting apparatus and method for manufacturing the same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101398507B1 (ko) * | 2006-10-27 | 2014-06-27 | 도레이 카부시키가이샤 | 광 반사판용 백색 폴리에스테르 필름 |
TWI596385B (zh) * | 2012-02-13 | 2017-08-21 | 東麗股份有限公司 | 反射膜 |
CN103018804B (zh) * | 2012-12-28 | 2016-01-20 | 合肥乐凯科技产业有限公司 | 一种反射膜 |
CN103323895B (zh) * | 2013-05-22 | 2015-06-17 | 宁波长阳科技有限公司 | 一种镀银型反射膜的制备方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04296838A (ja) * | 1991-03-27 | 1992-10-21 | Toppan Printing Co Ltd | 反射型スクリーンおよびその製造方法 |
JPH0583729U (ja) * | 1992-04-10 | 1993-11-12 | 株式会社きもと | ランプリフレクタ |
JPH0963329A (ja) * | 1995-08-30 | 1997-03-07 | Minnesota Mining & Mfg Co <3M> | 液晶バックライト用反射シート |
-
2004
- 2004-04-27 CN CNA2004800112726A patent/CN1781035A/zh active Pending
- 2004-04-27 JP JP2005505917A patent/JPWO2004097468A1/ja active Pending
- 2004-04-27 WO PCT/JP2004/006084 patent/WO2004097468A1/ja active Application Filing
- 2004-04-27 KR KR1020057020379A patent/KR20060003901A/ko not_active Application Discontinuation
- 2004-04-28 TW TW093111831A patent/TW200502091A/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04296838A (ja) * | 1991-03-27 | 1992-10-21 | Toppan Printing Co Ltd | 反射型スクリーンおよびその製造方法 |
JPH0583729U (ja) * | 1992-04-10 | 1993-11-12 | 株式会社きもと | ランプリフレクタ |
JPH0963329A (ja) * | 1995-08-30 | 1997-03-07 | Minnesota Mining & Mfg Co <3M> | 液晶バックライト用反射シート |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007037093A1 (ja) * | 2005-09-29 | 2007-04-05 | Idemitsu Kosan Co., Ltd. | 反射材及び発光ダイオード用反射体 |
JP2008231231A (ja) * | 2007-03-20 | 2008-10-02 | Idemitsu Kosan Co Ltd | 光半導体用反射材 |
JP2008243892A (ja) * | 2007-03-26 | 2008-10-09 | Idemitsu Kosan Co Ltd | 光半導体用反射材 |
US7883768B2 (en) * | 2007-04-25 | 2011-02-08 | Beijing Boe Optoelectronics Technology Co., Ltd. | Backlight module, diffusion plate and method of manufacturing the same |
JP2010128087A (ja) * | 2008-11-26 | 2010-06-10 | Mitsubishi Plastics Inc | 光学フィルムおよび光学フィルム積層金属体 |
EP3936761A1 (en) * | 2020-07-07 | 2022-01-12 | Kolonglotech. Inc | Flat lighting apparatus and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
TW200502091A (en) | 2005-01-16 |
TWI306808B (ja) | 2009-03-01 |
JPWO2004097468A1 (ja) | 2006-07-13 |
CN1781035A (zh) | 2006-05-31 |
KR20060003901A (ko) | 2006-01-11 |
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