KR101100962B1 - Method for Producing United Reflector Used in Backlight Unit of Liquid Crystal Display And United Reflector Used in Backlight Unit of Liquid Crystal Display Produced by Method - Google Patents

Abstract

The present invention provides a method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The manufacturing method of the present invention includes the steps of extruding and obtaining an integral reflector by injection molding the extruded material. In the extrusion process, the thermoplastic resin is first introduced into the main feeder at the start of the screw of the extruder, and the white inorganic dielectric material is introduced into the side feeder of the extruder and the molten thermoplastic resin Allow the white mineral dielectric material to be kneaded. In addition, the reflector is integrally formed of the same material as the lamp reflector, the lamp housing, the lower plate, and the mold frame. Therefore, the present invention can simplify the manufacturing process, has an excellent reflectance of the material itself, there is an advantage that does not require an additional process for increasing the reflectance, it is possible to reduce the manufacturing cost and to make the product lighter, slimmer.

Liquid Crystal Display, Backlight Unit, Integrated Reflector, Thermoplastic, White Inorganic Dielectric, Extruder, Injection Molding

Description

A method for manufacturing an integrated reflector for a backlight unit of a liquid crystal display device and an integrated reflector for a backlight unit of a liquid crystal display device manufactured according to the method.Method for Producing United Reflector Used in Backlight Unit of Liquid Crystal Display And United Reflector Used in Backlight Unit of Liquid Crystal Display Produced by Method}

The present invention relates to a method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device, and more particularly, to an integrated reflective plate of a lamp reflector, a lamp housing, a lower plate, and a mold frame in an edge type backlight unit structure of a liquid crystal display device. It relates to a manufacturing method of a reflecting plate formed of.

In general, a liquid crystal display (LCD) requires a light source because it does not have a self-luminous function, and the backlight unit serves as the light source. The backlight unit has a top-down method system that illuminates the entire surface of a substrate by placing a light source, or lamp, on the bottom of the liquid crystal panel, and an edge that distributes light evenly through the light guide plate and reflector by placing the light source on both sides or one side of the unit. It is divided into edge illumination system.

In the case of the direct method, the light source directly illuminates the substrate, so the light utilization rate is high, and there is no size limitation, so it can be applied to large LCD TVs and monitors, but since the light source is located very close to the panel and the number of lamps increases, Increasing problems may occur, and excessive generation of heat may cause screen staining, which may be a major cause of shortening the life of the LCD panel.

The edge method has uniform brightness and low power consumption, so it is mainly used for small LCD monitors or notebook computers, but a light guide plate is necessary to evenly distribute light on the side.

The structure of a general edge type backlight unit is shown in FIG. 1.

The edge type backlight unit has a light guide plate (located between the diffusion sheet 5 and the reflective film 6; not shown) in the center to transmit the light of the light source 7 located on the side of the product to the center. The lamp 7 as a light source is located on one or both sides of the backlight unit, and a lamp reflector 8 for reflecting the light of the lamp toward the light guide plate surrounds the lamp. The outside of the lamp reflector is wrapped around the lamp housing 8 to maintain the shape of the lamp and the reflector. A reflective film 6 is positioned below the light guide plate to reflect light from the lamp 7 through the light guide plate toward the front panel. A lower plate of a metal material is positioned below the reflective film 6 to support the reflective film. Do it. Optical film parts such as the diffusion film 5 and the prism films 3 and 4 are positioned on the upper part of the light guide plate, and a mold frame 9 is positioned on the entire exterior of the product to provide the light guide plate, the lamp housing, the metal lower plate, and the optical film part. It maintains the shape of the backlight unit.

Among the components of the backlight unit, the white polyester film is improved in Japanese Patent Application Laid-Open No. Hei 4-239540, Japanese Patent Application Laid-Open Nos. 2002-98811, 2002-138150 and 2001-305321. Disclosed is a technique.

U.S. Patent No. 5,837,757, Japanese Patent Application Laid-open No. Hei 7-242781 and Japanese Patent Application Laid-open No. Hei 9-176471 disclose a technique for reflectance and impact resistance of a white polycarbonate resin.

Japanese Laid-Open Patent Publication No. 1999-181267 discloses a technique for manufacturing a reflective sheet using a flame retardant white polycarbonate resin.

The reflective sheet manufactured by the conventional reflector plate manufacturing technique has an excellent reflectance but has a disadvantage in that it is difficult to apply to a liquid crystal display such as a notebook or a monitor because the thickness is relatively thick. In the case of the reflective film manufactured by the conventional reflector plate manufacturing technique, excellent reflectance performance can be obtained, but since the reflective film and the film, the mold frame, the lamp reflector, and the like are all separated parts, an additional assembly process is required, which is expensive. There is a disadvantage that the loss of light may occur in the fastening part of the component.

Korean Patent Laid-Open Publication No. 2006-093956 proposes a technology for forming a bezel for supporting the back of the backlight unit, a reflector for reflecting light from a light source to the light guide plate, and a mold frame for combining the reflector and the bezel with a metal or plastic material. I've done it. In this case, the process can be simplified by integrating parts, but it is impossible to reduce the weight of the product because it is necessary to use a metal material with high reflectance of the material itself. There is a disadvantage that an additional process is required to increase the manufacturing cost.

The Korean Patent Application Nos. 2005-0080738 and 2005-0080739 filed by the applicant are related to an integrated reflector structure composed of the same material, such as a reflector plate, a metal lower plate, a lamp holder, an optical film support, and a heat conductive resin composition applicable thereto. The technology was presented. The above technology is mainly focused on the manufacture of integrated reflectors and materials applied to direct-size backlight units for large-sized TVs, and is applicable to small- and medium-sized backlight units such as monitors and notebooks, particularly thin structures such as edge-type backlight units. This is difficult.

Accordingly, an object of the present invention is to manufacture an integrated reflector which is used in an edge type backlight unit of a liquid crystal display device such as a monitor and a notebook computer, in particular, a reflector formed integrally with the same plastic material as a lamp reflector, a lamp housing, a lower plate, and a mold frame. To provide a way. Such reflectors may be further processed, such as plating of highly reflective metals such as silver or aluminum, or surface treatment using conventional reflecting film or sheet material, in order to increase the reflectance on the surfaces of the reflector, lamp reflector and mold frame parts. It has excellent reflectance even without treatment.

In particular, it is an object of the present invention to provide a method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device having a high reflectivity, in particular, a high reflectivity of 95% or more at a thickness of 200 µm or more, and having excellent moldability and mechanical properties.

The above and other objects of the present invention can be achieved by the present invention described below.

The present invention provides a method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The manufacturing method according to the present invention comprises the steps of extruding a material comprising a thermoplastic resin and a white inorganic dielectric material by an extruder, and by inserting the extruded material into an injection molding machine, the backlight unit of the liquid crystal display device Obtaining a reflector used for the. In the extruding step, the thermoplastic resin is first introduced into a main feeder at the start of the screw of the extruder, and the white inorganic dielectric material is injected into a side feeder of the extruder and melted. The reflector plate obtained by kneading thermoplastic resin and the white inorganic dielectric material and obtained by injection molding includes: a lamp reflector reflecting light emitted from a lamp of the backlight unit toward a light guide plate; a lamp housing supporting the lamp and the lamp reflector; Integrally made of the same material as the at least one member selected from the group consisting of a reflecting plate for reflecting light emitted from the light guide plate back to the panel toward the panel, a lower plate for supporting the lower part of the backlight unit, and a mold frame for supporting the optical members; Formed The features. In particular, the integrated reflector may be integrally formed with all of the lamp reflector, the lamp housing, the lower plate, and the mold frame. It is preferable that such a reflecting plate has a thickness of 200 µm or more and maintains a reflectance measured at a total reflectance of light having a wavelength of 550 nm of 95% or more. The amount of the thermoplastic resin is 50 to 85% by weight, and the white inorganic dielectric material is 15 to 50% by weight based on the total weight of the thermoplastic resin and the white inorganic dielectric material.

In another aspect, the present invention provides an integrated reflector for a backlight unit of a liquid crystal display device manufactured by the above method.

The manufacturing method of the integrated reflector for the backlight unit of the liquid crystal display device of the present invention can simplify the manufacturing process by integrally forming the lamp reflector, the lamp housing, the reflecting film (reflective plate), the lower plate, and the mold frame with the same plastic material. It can be manufactured through one injection molding, and the material itself has an excellent reflectance, which does not require an additional process to increase the reflectance. This has the advantage of reducing the manufacturing cost, weight and slim product.

The present inventors have studied a method of extruding a material containing a thermoplastic base resin and a white inorganic dielectric material by an extruder so that the reflecting plate for a backlight unit of a liquid crystal display can have excellent reflectivity and thermal conductivity. By manufacturing the reflector material by the method and then manufacturing the reflector by the injection processing method, it was confirmed that a reflector having excellent optical properties, in particular, high reflectance and excellent thermal conductivity, could be obtained. In addition, if the reflector is formed integrally with other components of the backlight unit of the liquid crystal display using a material having excellent reflectance, it has been found to be advantageous in simplifying the process, lightening the product, and reducing the manufacturing cost.

Accordingly, in the present invention, in the extrusion process of a material comprising a thermoplastic resin and a white inorganic dielectric material, the thermoplastic resin is first introduced into a main feeder at the start of the screw of the extruder, and the white inorganic dielectric material is It is injected into the side feeder of the extruder to mix the molten thermoplastic resin and the white inorganic dielectric material to obtain a material for injection molding, in particular in the form of pellets and put it into an injection molding machine to injection molding It is to obtain an integrated reflector of a desired shape.

In the present invention, the integrated reflector is a component used in an edge type backlight unit of a liquid crystal display device, and includes a lamp reflector reflecting light from a lamp of the backlight unit toward the light guide plate, a lamp housing supporting the lamp and the lamp reflector, and the light guide plate. At least one member selected from the group consisting of a reflecting plate (reflective film or reflective sheet) for reflecting light emitted from the back of the panel toward the panel, a lower plate supporting the lower part of the backlight unit, and a mold frame supporting the optical members. It is formed integrally with the material, and is preferably formed integrally with all of the lamp reflector, the lamp housing, the bottom plate and the mold frame. The integral reflector manufactured by the present invention preferably has a product thickness of 200 μm or more and a reflectance measured by total reflectance of light having a wavelength of 550 nm of 95% or more.

The lamp reflector, lamp housing, reflective film, metal lower plate and mold frame of the backlight unit are generally made of different materials. Conventionally, technologies for manufacturing a part of the parts with the same material have been proposed, but a technology for manufacturing the entire part with the same plastic material and requiring no additional process for improving the reflectance has not been proposed yet. When manufacturing a backlight unit through such a conventional manufacturing method, the manufacturing process is complicated, there is a disadvantage that the weight of the product is heavy by using a metal material. The integrated reflector product proposed in the present invention is made of the same plastic material as the whole part, and can be manufactured by one injection molding, and the material itself has excellent reflectance, so that the backlight unit is not required to further improve the reflectance. It is possible to reduce the manufacturing cost and to make the product lighter and slimmer by simplifying the process in manufacturing. These advantages make it easy to apply to small and medium-sized liquid crystal displays, such as notebooks and monitors, where slimness and weight are important.

Hereinafter, the present invention will be described in more detail.

In general, a molded product manufactured from a thermoplastic resin material is directly manufactured into a desired shape by melting the thermoplastic resin by an extruder or a pellet-shaped intermediate material by extrusion processing, and then finally a desired shape by a method such as injection molding. Is processed. When there is an inorganic material added during extrusion processing of the thermoplastic resin, the thermoplastic resin is decomposed due to the interaction with the inorganic material, thereby increasing the possibility of color change, optical property deterioration, and mechanical property deterioration. This is especially true at higher temperatures. Therefore, the conventional extrusion process is difficult to produce a part that requires excellent physical properties.

The present invention provides a reflecting member for use in a backlight unit of a liquid crystal display by extruding a material containing a thermoplastic resin and a white inorganic dielectric material for obtaining high reflectance by an extruder. Accordingly, the present invention improves the above problems, and the thermoplastic resin is introduced into the extruder first through the main feeder of the extruder, rather than simultaneously introducing the thermoplastic resin and the white inorganic dielectric material in the extruder. After melting to have a white inorganic dielectric material is introduced later through the side feeder of the extruder. The cause of the decomposition of the resin in the extruder can be caused by the heat energy supplied for melting the resin from the extruder and the frictional heat between the resin and the resin, or the resin and the inorganic material, and the heat energy due to the viscous dissipation of the resin melt. The present invention is characterized in that the white inorganic dielectric material is introduced after the resin plasticization zone of the extruder barrel in order to significantly reduce the possibility of denaturation or decomposition of the thermoplastic resin at high temperature by interaction with the white inorganic dielectric material. By introducing the white inorganic dielectric material after the resin plasticization zone of the extruder barrel, it is possible to reduce the generation of thermal energy due to frictional heat between the resin and the inorganic material and viscous dissipation, thereby significantly reducing the possibility of resin decomposition.

At this time, on the one hand, the thermoplastic resin and the white inorganic dielectric material must be sufficiently kneaded to achieve the desired properties and performance of the desired product, so that the white inorganic dielectric material can satisfy the conditions that sufficient kneading with the thermoplastic resin can be achieved even if it is introduced later. Should be Under such conditions, it is important to reduce the contact time of the thermoplastic resin with the white inorganic dielectric material at the highest possible temperature. Thus, the screw combination of the extruder barrel after the addition of the white mineral dielectric material can be arbitrarily selected under conditions that allow sufficient kneading to occur. At this time, it is preferable to use a twin screw extruder as the extruder.

Extrusion processing method according to the present invention can suppress the modification or decomposition of the thermoplastic resin by heat to enable the ideal kneading, blending of the raw materials and thereby does not cause a decrease in physical properties.

The integrated reflector used in the edge type backlight unit structure of the liquid crystal display device as shown in FIG. Can be prepared. 2 shows a lamp reflector reflecting light from the lamp 7 toward a light guide plate (located between the diffusion sheet 5 and the reflecting film 6; not shown), a lamp housing supporting the lamp and the lamp reflector, and a reflecting film ( 6) and the lower plate supporting the lower part of the backlight unit, and the mold frame for supporting the optical member and the optical film are shown in the unitary mold frame 10 structure made of the same plastic material. In FIG. 2, the reflective film 6 is clearly distinguished from the integrated mold frame 10 in order to clearly express the reflective film 6. However, in the present invention, the reflective film 6 is formed of the integrated mold frame 10. It can be formed integrally. That is, the reflective film 6 may be integrally formed through one injection molding from the same plastic material as the integrated mold frame 10.

The reflecting plate obtained as described above may have a high reflectance of 95% or more when the reflectance of a region having a thickness of 200 μm or more in the entire product region is measured by total reflectance of light having a wavelength of 550 nm. At this time, as the thickness of the product becomes thinner, the amount of light passing through the material increases, resulting in a decrease in reflectance, so that sufficient luminance cannot be obtained, and mechanical properties are also degraded, making it difficult to maintain the shape of the product. When the thickness of the product is 200 μm or less, it is difficult to form the product through general injection molding, and the reflectance is greatly reduced, so that the reflecting plate cannot obtain sufficient luminance. Moreover, even if the thickness of the product is 200 µm or more, sufficient luminance is difficult to be obtained when the reflectance of the site becomes 95% or less. Accordingly, the present invention provides a material capable of producing an integrated reflector, wherein the reflectance of a portion having a thickness of 200 µm or more in the whole product is maintained at 95% or more.

The raw material used in the present invention basically comprises a thermoplastic resin and a white inorganic dielectric material, based on the total weight of the thermoplastic resin and the white inorganic dielectric material, the thermoplastic resin is preferably 50 to 85% by weight, white inorganic The dielectric material is preferably 15 to 50% by weight.

As the thermoplastic resin used in the present invention, polyethylene terephthalate, polyamide, polycarbonate, polystyrene, polyphenylene sulfide, polysulfone, polyether sulfone, polyetherimide, polyether ether ketone, polyarylate, polymethylmethyl At least one member of the group consisting of acrylate, polyvinyl alcohol, polypropylene, polyethylene, polyacrylonitrile butadiene styrene copolymer, and a copolymer containing styrene, fluorine resin, polyvinyl chloride and polyacrylonitrile It can be selected and used above. The thermoplastic resin is not particularly limited as long as it can be used as the material of the above-described reflecting plate, but may preferably be a polycarbonate resin. As the polycarbonate resin, both homopolycarbonate and copolycarbonate resin can be used, and blends thereof can also be used.

The white inorganic dielectric material used in the present invention serves to improve the reflectance in combination with the thermoplastic resin, and at least one member from the group consisting of TiO ₂ , BaSO ₄ , SiO ₂ , B ₂ O _3, and Al ₂ O ₃ . It can be used alone or in combination. In particular, TiO ₂ is preferable.

In addition, the raw material used in the present invention may further include a filler selected from the group consisting of flakes and glass fibers and halogen or non-halogen flame retardant. The filler may be added in an amount of 5 to 90 wt% based on the total weight of the thermoplastic resin and the white inorganic dielectric material, and the flame retardant may be added in an amount of 0.01 to 20 wt%. The halogen or non-halogen flame retardant is bromine carbonate oligomer, Sb ₂ O ₃ , phosphorus and phosphate flame retardant, melamine cyanurate, melamine, triphenyl isocyanurate, melamine phosphate, melamine pyrophosphate, ammonium polyphosphate , Alkyl amine phosphate, melamine resin and zinc borate can be selected from the group consisting of one or more.

In addition, the raw material may further include 0.01 wt% to 10 wt% of the UV stabilizer based on the total weight of the thermoplastic resin and the white inorganic dielectric material.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples. Table 1 shows the physical properties of the molded specimens prepared in Examples and Comparative Examples. Films were prepared from the resins prepared in Examples and Comparative Examples, and the change values of reflectances different in thickness are shown in Table 2.

[Example]

Specimens of the following Examples and Comparative Examples were prepared by injection molding to the specimen standard according to each measurement method after the extrusion process described below. In order to confirm the change in reflectance by thickness of the product, a film having a thickness of 200 μm, 500 μm, and 1000 μm was manufactured at 220 ° C. using a single extruder manufactured by Haake. The physical properties of the resin compositions and the specimens of Examples and Comparative Examples were measured based on the following methods.

Tensile Strength and Elongation: ASTM D638

Flexural Strength and Flexural Modulus: ASTM D790

Impact Strength: ASTM D256

Heat Deflection Temperature: ASTM D648

Reflectance: Spectrophotometer (Gretagmacbeth, Color-Eye 7000A) was used to measure the total reflectance of the wavelength of 550 nm using a D65 light source.

Example  One

75% by weight of polycarbonate resin (manufactured by LG-Dow) and antioxidants, lubricants, and UV stabilizers were introduced into the main inlet, which is the beginning of the screw in the coaxial twin extruder, and 25% by weight of TiO ₂ was added to the side of the extruder, It injected | threw-in to the part to which the resin plasticization area | region is complete | finished, and it processed at 240 degreeC and 200 rpm.

Example  2

85 wt% of polycarbonate resin (manufactured by LG-Dow) and antioxidants, lubricants, and UV stabilizers were introduced into the main inlet, which is the beginning of the screw of the coaxial twin screw extruder, and 15 wt% of TiO ₂ was added to the side of the extruder and the plasticizing zone of the resin. It was put in the end portion was processed at 240 ℃, 200rpm.

Comparative example  One

75% by weight of polycarbonate resin (manufactured by LG-DOW), 25% by weight of TiO ₂ , an antioxidant, a lubricant, and an ultraviolet stabilizer were introduced into the main inlet, which is the beginning of the screw of the twin screw extruder, and processed at 240 ° C. and 200 rpm.

Comparative example  2

Total reflectance was compared using a PET reflective film (Toray Co., Ltd., product name: E60L), which is used as a reflective film of the liquid crystal display backlight unit.

Properties unit Example 1 Example 2 Comparative Example 1 Comparative Example 2 The tensile strength kg / cm ² 580 610 460 - Tensile elongation % 30 60 30 - Flexural strength kg / cm ² 1100 1100 980 - Flexural modulus kg / cm ² 27000 25000 25000 - Impact strength kgcm / cm 30 40 25 - Heat distortion temperature ℃ 120 122 120 -

Properties Film thickness Example 1 Example 2 Comparative Example 1 Comparative Example 2 reflectivity 200 μm 95.3 - 92.7 96.1 500 μm 95.8 - 93.5 - 1000 μm 95.9 - 95.2 -

As shown in the table, the high reflectance material produced by the extrusion processing method according to the present invention is excellent in the overall physical properties, it is understood that the reflectance according to the thickness maintains a high reflectance of 95% or more at 200㎛ or more Can be.

1 is a cross-sectional view illustrating a structure of an edge type backlight unit used in a liquid crystal display device.

2 is a cross-sectional view illustrating a structure of an edge type backlight unit to which an integrated reflector according to the present invention is applied.

<Description of the symbols for the main parts of the drawings>

1: metal tops 2: protective sheet

3: Prism Sheet-U 4: Prism Sheet-L

5: diffusion sheet 6: reflective film

7: Lamp 8: Lamp reflector and lamp housing

9: mold frame 10: integral mold frame

Claims (12)

Extruding a material comprising a thermoplastic resin and a white inorganic dielectric material by an extruder and obtaining the reflector used in the backlight unit of the liquid crystal display device by injecting the extruded material into an injection molding machine. and, In the extruding step, the thermoplastic resin is first introduced into a main feeder at the start of the screw of the extruder, and the white inorganic dielectric material is injected into a side feeder of the extruder and melted. To mix the thermoplastic resin with the white inorganic dielectric material, The reflector plate obtained by injection molding includes a lamp reflector reflecting light emitted from a lamp of the backlight unit toward a light guide plate, a lamp housing supporting the lamp and the lamp reflector, and reflecting light emitted from the light guide plate toward the panel back toward the panel. Integrally formed of the same plastic material as the at least one member selected from the group consisting of a reflecting plate, a lower plate supporting the lower portion of the backlight unit, and a mold frame supporting the optical members of the backlight unit, The feed point of the white inorganic dielectric material in the extruder is after the plasticization zone in the extruder barrel A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, The integrated reflector is formed integrally with all of the lamp reflector, the lamp housing, the lower plate and the mold frame. A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, The reflecting plate has a thickness of 200 μm or more, and the reflectance measured by total reflectance of light having a wavelength of 550 nm maintains 95% or more. A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, The amount of the thermoplastic resin is 50 to 85% by weight, and the white inorganic dielectric material is 15 to 50% by weight based on the total weight of the thermoplastic resin and the white inorganic dielectric material. A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. delete The method of claim 1, The thermoplastic resin is polyethylene terephthalate, polyamide, polycarbonate, polystyrene, polysulfone, polyether sulfone, polyetherimide, polyetheretherketone, polyarylate, polymethylmethylacrylate, polyvinyl alcohol, polypropylene, polyethylene , A polyacrylonitrile butadiene styrene copolymer, a copolymer containing styrene, fluorine resin, polyvinyl chloride, and at least one member selected from the group consisting of polyacrylonitrile A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, The thermoplastic resin is characterized in that the polycarbonate resin A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, The white inorganic dielectric material is at least one selected from the group consisting of TiO ₂ , BaSO _{4 ,} SiO ₂ , B ₂ O ₃ and Al ₂ O ₃ A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, The white inorganic dielectric material is characterized in that the TiO ₂ A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, Barrel temperature of the extruder is characterized in that the range of 220 ~ 340 ℃ A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. The method of claim 1, 5 to 90% by weight of a filler selected from the group consisting of flakes and glass fibers, or halogen or non-halogen based on the total weight of the thermoplastic resin and the white inorganic dielectric material as a material for manufacturing the reflecting plate Characterized in that it further comprises 0.01 to 20% by weight of flame retardant A method of manufacturing an integrated reflector for a backlight unit of a liquid crystal display device. A lamp reflector manufactured according to any one of claims 1 to 4 or 6 to 11 and reflecting light from a lamp of a backlight unit toward a light guide plate, a lamp supporting the lamp and the lamp reflector. At least one member selected from the group consisting of a housing, the reflecting plate for reflecting light emitted from the light guide plate back to the panel toward the panel, a lower plate for supporting the lower part of the backlight unit, and a mold frame for supporting the optical members of the backlight unit; Integrally formed from the same plastic material, The reflectance measured by the total reflectance of light having a thickness of 200 μm or more and having a wavelength of 550 nm maintains 95% or more. Integrated reflector for backlight unit of liquid crystal display device.

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