KR101353889B1 - Reflection member - Google Patents

Abstract

The present invention relates to a reflective member, by providing a reflective member comprising a fiber imparted with metallic properties, it is possible to provide a reflective member capable of providing a display having excellent reflectance and more reliable.

Description

Reflection member {Reflection member}

The present invention relates to a reflective member, and more particularly to a reflective member comprising a fiber imparted metallicity.

The liquid crystal display, which is used as a main component of portable electronic devices such as desktop computers, notebook computers, TVs, and mobile phones, uses a liquid crystal layer of non-light-emitting material, and thus includes a backlight unit as a separate light source.

Such a backlight unit includes a direct type and an edge type according to the shape of the light source. In the direct type, a plurality of linear, dotted, and planar light sources are disposed below the image display unit, and light emitted from the light source passes through the liquid crystal display device toward the front of the liquid crystal display device to display a specific image. In the edge type method, a plurality of linear or point light sources are disposed on the side of the image display unit, and light is scattered by using an optical component such as a light guide plate so that the light source can reach the image display device on the front surface uniformly. Directed to the front face of the liquid crystal display device, this light passes through the liquid crystal display device to display a specific image. Linear light sources used here include CCFL (Cold Cathode Fluorescent Lamp), EEFL (External Electrode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp), etc. The light source of LED is LED (Light Emitted Diode).

In the direct type backlight unit, a thin tubular light source is applied. The light is radiated from the tubular light source to the front. The point type light source used in the direct type or edge type is a junction point of a lamp and a supporting structure. Except for the light is generated to the front. Therefore, when the light irradiated from the light source is irradiated in a direction other than the image display unit, it is necessary to change the direction of the light to the image display unit to increase the amount of hostile light to improve visibility of the liquid crystal display device. To this end, a reflection sheet is installed on the side or the back of the light source to reflect light emitted to the rear portion.

In this case, the reflective sheet should have reflectivity to reflect the light of the light source lamp to improve the brightness so that the liquid crystal display does not flash, and concealability so that devices, frames, and the like arranged on the rear surface of the backlight unit cannot be identified.

The most representative method for manufacturing a conventional reflective sheet is to form bubbles by impregnation / foaming method with a film-like product made of a raw material such as polyethylene (Poly-ethylene), for example, a PET (Poly-ethylen Terephthalate) film. will be. This process is to produce a film fabric from the material of the raw material of the film, put the prepared film fabric in a reactor that can inject gas, impregnated with gas by pressurization, and the impregnated film fabric is foamed through a heating foaming process After forming the fine pores therein is prepared through a cooling flattening process.

Or when manufacturing the product on the film, the filler is included, and the foamed through the stretching process by the included filler to form a fine construction and then through the cooling process to make a reflective sheet.

Actually, the above processes are known, but it is not easy to distinguish the process used in the final product by the companies that make the reflective sheet. Toray (Japan, Toray's E60L, E6SL, E6TV, SKC's RP05U, RP10, RP17N, SY64, and Shinhwa's SRU810G.

They use fillers such as titanium dioxide (TiO ₂ ), barium sulfate (BaSO ₄ ), and calcium carbonate (CaCO ₃ ) to exhibit foaming properties, and antimony trioxide (Sb ₂ O ₃ ) and dioxide to improve reflection properties. It may be coated with titanium (TiO ₂ ) or the like.

However, when the white pigment is dispersed, the amount of pigment should be increased to suppress the leakage of light to the back side. Since the white pigment absorbs light of a specific wavelength, there is a problem that the increase of the amount of the pigment increases and the reflectance decreases. .

In addition, when metal deposition is applied to the surface, there is a problem that manufacturing cost is high first, and there is a problem that luminance stain occurs even with a slight distortion of the sheet because diffusion reflection is difficult to occur. In the case of vapor deposition, there is a problem that high luminance cannot be obtained depending on the type of the metal, or the durability is insufficient, so that deterioration proceeds quickly, resulting in deterioration of luminance over time.

In addition, a method of drawing or foaming is used to form bubbles in the sheet made of synthetic resin. When such a method is used, it is difficult to control the particle size or distribution of the fine bubbles, and thus the reflectance variation may be large. In addition, in the case of chemical foams, problems such as discoloration and odor of the foams occur due to decomposition residues of the foams remaining in the foams, and foams manufactured by the physical foaming method have flammability or toxicity, and air pollution problems. There is a possibility to generate. In addition, such a method has a limit in producing fine bubbles at a level capable of maximizing reflectance.

There is also a diffuse reflecting sheet made of nonwoven fabrics. Diffuse reflection sheet from DuPont (USA, DuPont) is being made using a conventional nonwoven fabric (Korean Patent Publication No. 2006-0119784). This nonwoven application diffuse reflecting sheet is made by laminating a pleated spun fiber or flexi filament of an irregular web structure of polyethylene including a plurality of pores to a backing support layer. In the nonwoven fabric applied diffused reflective sheet, the nonwoven fabric includes an inorganic particulate filler such as antimony trioxide (Sb ₂ O ₃ ), titanium dioxide (TiO ₂ ), clay, mica, glass powder, etc. This possible viscoelastic pressure sensitive adhesive is utilized to bond to the support layer.

In the case of the diffuse reflecting sheet to which such a non-woven fabric is applied, reflection characteristics are shown by using the characteristics of the pores, and since the pores formed between the various fibers of the nonwoven fabric are utilized, the thickness is thicker than other types of products, and foreign materials are easily generated. There was a vulnerability to external stimuli.

The present invention is to provide a reflective member having excellent reflectance using a fiber structure.

In addition, the present invention is to provide a reflective member capable of providing a more reliable display.

To this end, the present invention provides a reflective member including at least one or more layers of metallic structures imparted with metal as a preferred embodiment.

The reflective member according to the embodiment may be a textile structure provided with metallic property is a woven fabric of a wire wound metal.

Reflective member according to the embodiment may be a metal structure is a metal structure is plated with a metal fabric.

In this embodiment, the plating of the metal on the fabric may be by electroless plating.

In the above embodiment, the metal may be a white metal.

Reflective member according to the embodiment may be a non-woven fabric is a metal structure imparted.

Reflecting member according to the embodiment may be to include a support.

In another aspect, the present invention provides a backlight unit assembly including the reflective member.

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

The reflective member of the present invention includes at least one or more layers of metallic structures imparted with metallic properties.

The fibrous structure may be woven or nonwoven.

The term woven herein is a form of fibers that are knitted or woven in the same pattern. These fabrics are produced in various forms depending on how the strings and the strings are used. Fabrics that can be used here are simply collections of fibers formed in the same pattern, such as knitted fabrics made from loops, and knitted from the loops, which are made by reading from each other, forming a new loop by hooking the threads, while the nonwoven fabric refers to a random way Refers to a structure including individual fibers having a flat shape including fibers not knitted or woven and not having the same pattern, and may be in the form of a network in which the fibers are connected to each other, or may be in a form in which each fiber is stacked.

Fiber polymers used in the production of the above woven or nonwoven fabrics include polyolefins (e.g. polyethylene, polypropylene, polybutylene, etc.), acrylonitrile-butadiene-styrene (ABS) resins, polystyrene, styrene-acrylonitrile, Styrene-butadiene, styrene-maleic anhydride, vinyl plastics (e.g. polyvinyl chloride (PVC)), acrylics, acrylonitrile-base resins, acetals, perfluoropolymers, hydrofluoropolymers, polyamides, poly Amides-imides, polyaramids, polyarylates, polycarbonates, polyesters (e.g. polyethylenenaphthalate (PEN)), polyketones, polyphenyleneethers, polyphenylenesulfides and polysulfones, viscose rayon Can be.

Specific examples of the fiber polymers described above include polyester f. F. Yarn 150 denier and the like. (Denier: Standard Density: 450m, Unit Weight 0.05g: 1 Denier)

Polyester fiber polymers given as specific examples above are generally made as follows.

The polyester polymer, which is a thermoplastic polymer, is extruded through a spinneret at a temperature above the melting point to be solidified by cooling, followed by a melt spinning process of winding. In order to impart strength to the melt-stretched unstretched yarn, a stretched yarn is made through a stretching process of expressing the orientation and crystallization in the fiber structure.

If said process is further subdivided, (1) the drying process of a chip | tip is performed in order to prevent molecular weight fall by the hydrolysis of a fiber polymer, and to make the molecular weight difference of a chip | tip uniform. The chip is dried in two stages of preliminary drying at 100 to 120 ° C. for 10 minutes and main drying at 160 to 200 ° C. for 1 to 3 hours. (2) Next, the polyester chip dried by the melting and spinning process is melt-spun at a temperature of 290 ° C through an extruder. (3) Next, the fiber extruded by the cooling process is cooled by a cooling air stream in the air, where it solidifies to form a basic form. (3) Next, in order to impart the winding stability of the non-drawn yarn in the emulsion applying process, and to facilitate the handling of the post-process, a combination of a smoothing agent, an antistatic agent, and the like is processed and wound using a winder.

The reflective member of the present invention includes a fiber structure imparted with metallicity, and the following methods may be used to impart metallicity to the fiber structure.

First, a metal structure is imparted to the fiber itself, and a fiber structure is manufactured using the fiber imparted with this metal property.

The form to which the metallicity is imparted is not particularly limited, and for example, the forms shown in FIGS. 1 to 3 are possible, and various changes and modifications can be made by those skilled in the art without departing from the technical spirit, and the technical field to which the present invention belongs. It includes those that can be changed or modified by those skilled in the art.

The fibrous structure imparted with metallicity may be a woven or nonwoven fabric which is woven or formed from the fibers 10 wound with the linear metal 20.

It is also possible to use products imparted with metallic properties to the fiber. Specific examples include Hwayoung Industry Co., Ltd. (MX, MHS, ST Type).

When producing the above-mentioned metallic fibers, it is advantageous to use a white metal such as aluminum or silver so that the metal wire used for the metallicity does not affect the color to be expressed in the image display unit.

Second, metal plating is performed on the fiber structure made of fibers.

After the chemical activation step is made through the prefabricated fabric structure, the electroless plating of the metal on it can be carried out by the following method.

(1) Pretreatment step: In the pretreatment step, the electroless plating is easily performed when imparting metallicity to the fabric by electroless plating.

The pretreatment step uses an acidic aqueous solution to activate the fabric to be subjected to the electroless plating. In the aqueous solution, one or more of alcohol, ketones such as acetone, and aldehydes such as formaldehyde are diluted with water.

(2) Washing step: The pretreatment solution is washed with distilled water flowing through the fabric treated in the pretreatment step and dried using a hot air dryer.

(3) Etching Step: The washed fabric is etched on the surface using acid. Etching is used to corrode the surface using acid and to make plating more easily. Dilute it to 5 to 20% by using strong acid such as hydrochloric acid, hydrofluoric acid, sulfuric acid, and chromic acid alone or mixed. do. The treatment time is within 5 to 30 minutes, the temperature is less than 60 ℃, at this time, if the treatment time is too long or the temperature is too high, the fabric is oxidized due to the phenomenon of weakening, so that there is no change in physical properties.

(4) Washing step: The etching solution is washed with distilled water flowing through the fabric treated in the etching step, and dried completely using a hot air dryer.

(5) Electroless Plating Step: Electroless plating is carried out by putting the washed fabric in a solution containing metal ions and reacting. The electroless plating step is usually carried out in acidic conditions and the temperature is carried out at 60-70 ° C.

In this case, the thickness of the metal to be electroless plated is determined according to the temperature and time at which the electroless plating is performed, and thus, the time is adjusted according to the desired thickness. The speed is shown and its thickness can be adjusted by temperature, concentration of electroless plating metal solution, time, etc. as necessary. The thickness of the plating may be 0.01 μm to 10 μm as necessary.

As the metal used for the electroless plating, nickel, silver, aluminum, or the like, which may appear white after the electroless plating is performed, is used.

The reflective member of the present invention may be one having a support formed on one surface of the fabric or nonwoven fabric provided with the metallicity. The metal or woven fabric imparted with the metallicity is hard to maintain its original shape due to its rigidity, and at this time, the support may be formed on the surface opposite to the image display portion of the metallic structure.

The support may be used to maintain the shape of the fabric or nonwoven fabric provided with metallic properties regardless of its type, and may be used without limitation to a specific material as long as it can maintain the shape. For example, paper, fabric, foamed polymer, polymer film, metal Foil or metallized film and the like can be used. Alternatively, the adhesive may be coated on the back surface of the woven or nonwoven fabric to be directly attached to the backlight unit.

Meanwhile, when forming a support on one surface of the fiber structure, it can be formed by attaching with an adhesive.

When attaching the support or attaching the fiber structure to the backlight unit, an adhesive is used that maintains permanent adhesiveness to minimize post-deformation after attachment. In general, as the adhesive that maintains such permanent adhesiveness, a polyurethane-based adhesive or an acrylic / polyacryl-based adhesive may be used.

The reflective member of the present invention may include a single-layered or two or more multilayered fiber structures provided with the metallicity described above.

When the fiber structure is formed in multiple layers, the plurality of fiber structures may be bonded to each other and bonded using the above-mentioned adhesive, and in the case of the nonwoven fabric, the fiber structure may be formed by weakly thermally bonding the sheets under pressure.

In particular, the reflective member of the present invention is preferably thin so that it can be applied to the field of small display or slim liquid crystal display, and the overall thickness is 200 to 800 so as to have a sufficient thickness to reflect all the light without passing through the light source. May be μm.

The present invention can provide an optical display unit including the reflective member described above.

At this time, the light source that can be used in the backlight unit for a liquid crystal display to which the reflective member of the present invention can be applied may be a single or multiple light sources emitting visible light, for example, incandescent, mercury, metal halide, and low pressure. Sodium type, high pressure sodium type, arc type, compact fluorescent type, stabilizer built-in fluorescent type, cold cathode fluorescent lamp (CCFL) type, light emitting diode (LED) type, bulb or tube lamp of similar device type that can emit visible light, etc. Can be.

Hereinafter, examples of the present invention will be described in more detail, but the scope of the present invention is not limited to these examples.

<Examples 1 and 2>

Fiber having a metallicity was used in the rayon fiber manufactured by Hwayoung Industry Co., Ltd. ST type wound the entire wire, the specific model is shown in Table 1.

model name Length per kg Denier Viscose Rayon 75D / 1 64,200 m 140 Viscose Rayon 120D / 1 48,600 m 185

The fabrics were made of the above metallic fibers, and the thicknesses were 191 μm and 207 μm, respectively.

<Examples 3 to 6>

Kolon Co., Ltd. polyester f. A fabric having a thickness of 150 μm and 183 μm was prepared using F. Yarn 150 denier and 250 denier fibers, and the fabric was subjected to nickel electroless plating in the following manner. For each fabric, the plating thickness was set to 3 µm and 5 µm.

 Nickel electroless plating solution was used by Poongwon Chemical.

(1) The fabric was soaked for 5 minutes in a solution diluted to 10% by weight in ethyl alcohol.

(2) The fabric was taken out and washed with running distilled water for 3 minutes. After the washing was completed using a hot air dryer.

(3) The fabric was immersed for 3 minutes in a solution of commercial sulfuric acid diluted to 5% by volume in water.

(4) The fabric was taken out and washed with running distilled water for 3 minutes. After the washing was completed using a hot air dryer.

(5) 200 mL per 800 mL of distilled water was added to the NIP-LT solution of Pungwon Chemical Co., Ltd., and electroless plating (nickel plating) was performed at 70 ° C. At this time it was plated at the level of ~ 0.1 ㎛ per minute.

(6) The fabric was taken out and washed with running distilled water for 3 minutes. After the washing was completed using a hot air dryer.

&Lt; Examples 7 to 10 &

In order to manufacture nonwoven fabrics having metallic properties, Kolon's Finon C3020NW (weight 20g / m ² , thickness 90㎛) and C3025NW (weight 25g / m ² , thickness 120㎛) were used in the same manner as in Examples 3 to 6, respectively. 3 micrometers and 5 micrometers plating were performed.

<Examples 11-14>

The metallic structures imparted with the above metal may be configured in multiple layers in order to improve its performance. In order to manufacture nonwoven fabrics having metallic properties, Kolon's Finon C3020NW (weight 20g / m ² , thickness 90㎛) and C3025NW (weight 25g / m ² , thickness 120㎛) were used in the same manner as in Examples 3 to 6, respectively. 3 micrometers and 5 micrometers plating were performed, and two plated nonwoven fabrics were adhere | attached using Topcos Co., Ltd. highly transparent double-sided adhesive PET film (thickness 20 micrometers).

&Lt; Comparative Example 1 &

Kolon Co., Ltd. polyester f. A fabric having a thickness of 150 μm was prepared using fibers of F. Yarn 150 denier.

Comparative Example 2

Kolon Co., Ltd. polyester f. A fabric of 183 μm was prepared using F. Yarn 250 denier fibers.

&Lt; Comparative Example 3 &

Kolon Corporation's Finon C3020NW (weight 20g / m ² , thickness 90㎛) was prepared.

&Lt; Comparative Example 4 &

Kolon Corporation's Finon C3025NW (weight 25g / m ² , thickness 120㎛) was prepared.

The fabrics and non-woven fabrics of Examples 1 to 14 and Comparative Examples 1 to 4 were bonded and fixed to Toray Saean Excell XJ332 (100 μm thick) using a high-transparent double-sided adhesive PET film (20 μm thick) from Topcos, Reflectance was measured as shown in Table 2 below.

How to measure reflectance

Reflectance was measured using a Minolta Spectrophotometer CM-3500d.

The measurement conditions are measured based on JIS Z8700 condition C, ISO 7724/1, and a Xenon lamp is used for the light source for measurement. In this measurement, reflectance was measured on the basis of 550 nm, and relative comparison was performed.

Reflectance measurement result

division Detail structure Total thickness (탆) reflectivity(%) Example 1 Viscose Rayon 75D / 1 applied 311 97.5 Example 2 Viscose Rayon 120D / 1 applied 327 98.0 Example 3 Kolon F.Yan Plated 3㎛ on 150 Denier 276 95.3 Example 4 Kolon F.Yan Plating 5㎛ on 150 Denier 280 95.8 Example 5 Kolon F.Yan Plated 3㎛ on 250 Denier 309 97.1 Example 6 Kolon F.Yan Plating 5㎛ on 250 Denier 313 97.9 Example 7 3μm plating on Kolon Finon C3020NW 216 96.5 Example 8 5μm plating on Kolon Finon C3020NW 220 97.2 Example 9 3μm plating on Kolon Finon C3025NW 246 97.8 Example 10 5㎛ Plating on Kolon Finon C3025NW 250 98.9 Example 11 2 sheets of 3㎛ plating on Kolon Finon C3020NW 332 98.8 Example 12 2 sheets of 5㎛ plating on Kolon Finon C3020NW 340 98.9 Example 13 2 sheets of 3㎛ plating on Kolon Finon C3025NW 392 98.8 Example 14 2 sheets of 5㎛ plating on Kolon Finon C3025NW 400 99.2 Comparative Example 1 Kolon F.Jan 150 Denier 150 68.9 Comparative Example 2 Kolon F. Jan 250 Denier 183 72.3 Comparative Example 3 Kolon Finon C3020NW 90 60.2 Comparative Example 4 Kolon Finon C3025NW 120 67.4

1 is a view showing a preferred form of the fiber that can produce a metal structured fiber structure included in the reflective member of the present invention,

2 and 3 are views showing another preferred form of the fiber that can produce a metal structured fiber structure included in the reflective member of the present invention.

* Explanation of the main symbols in the drawings

10: fiber

20: metal

Claims (8)

At least one layer of a structure made of a fiber imparted with metallic properties, The structure is made of a fiber imparted with metallicity, the fabric is woven from a fiber wound in a metal line; Or a reflective member for a backlight unit assembly in which a metal is electroless plated on the fabric. delete delete delete The method of claim 1, Reflective member, characterized in that the metal is a white metal. delete The method of claim 1, Reflective member, characterized in that it comprises a support. 8. A backlight unit assembly comprising the reflective member of any one of claims 1, 5 and 7.

Images