KR101639565B1 - Backkight apparatus - Google Patents

Abstract

The present invention relates to a backlight structure, including a diffusion plate for diffusing irradiated light to the outside; A lower plate which reflects the light diffused into the irradiation space toward the diffusion plate side; Housings coupled around the diffuser plate and the bottom plate; And a light source coupled to the one housing and irradiating light into the irradiation space; A diffuser is formed on the diffuser plate so that the diffuser diffuses when the light irradiated from the light source to the irradiation space hits the surface of the diffuser plate; A housing reflector is installed on the surface of the mounting portion of the other housing facing the housing provided with the light source so that the light irradiated from the light source is reflected toward the irradiation space side; A lower plate reflector is provided on the upper surface of the lower plate so that the light irradiated from the light source is reflected to the irradiation space side.
Accordingly, since the light source is installed only in one housing, it is very convenient to maintain lamps and the like, and the light source radiates an irradiation space with excellent light diffusion, so that light diffusibility is improved, light sources are assembled in one housing, If the housings are pushed around the plate and the bottom plate, the backlight structure having the irradiation space is assembled, so that the entire assembly of the backlight is very simple. Further, when the light is irradiated from the light source, more diffuse reflection occurs in the dark part of the inner surface of the diffusing plate, so that the inner surface of the diffusing plate is uniformly emitted, thereby uniformly emitting the entire diffusing plate.

Description

BACKLIGHT APPARATUS

The present invention relates to a backlight structure, and more particularly, because a light source is installed only on one side of a housing, it is very convenient to maintain a lamp, such as replacing a lamp in the field, and even when the light source is irradiated from only one side of the backlight, To a backlight structure that is very easy to assemble in its entirety.

2. Description of the Related Art In general, a liquid crystal display device is one of the most widely used flat panel display devices. The liquid crystal display device is composed of two display panels on which electric field generating electrodes are formed and a liquid crystal layer interposed therebetween. To adjust the transmittance of light passing through the liquid crystal layer.

Such a liquid crystal display device includes a backlight unit for generating light and a liquid crystal panel for displaying an image using light generated from the backlight unit.

The liquid crystal panel of the liquid crystal display device displays image information in such a manner as to block or pass light generated in the backlight unit without emitting light. Therefore, the liquid crystal display device necessarily requires a light source, and the backlight located behind the liquid crystal panel is used as the plane light.

The backlight unit is composed of a lamp, a reflection plate, a light guide plate and an optical film, and the optical film is composed of a reflection film, a diffusion film and a prism film. 2. Description of the Related Art Liquid crystal display devices are widely used for display devices such as notebooks, monitors, TVs, mobile phones, and the like, depending on their applications.

Such a conventional backlight structure for a display has a light guide plate, a light source is installed on one side of the light guide plate, and a light source cover is installed so that light emitted from the light source is collected toward the light guide plate. A reflective sheet is provided on the lower part of the light guide plate to reflect the light reflected toward the opposite side of the screen to the light guide plate side.

In the flat panel display having the above-described structure, since the distance to reach the light is limited, even though the light source is configured on both sides, there is a problem that the size of the flat panel display can not exceed 100 inches.

In addition, even when a light source having a large light amount is used, the amount of light scattered by the pattern at the lower portion of the conduit diverges a large amount of light near the light source. However, as the distance from the light source increases, a small amount of light is emitted. There was difficulty.

In order to solve such a problem, Korean Patent Laid-Open Publication No. 10-2001-58167 and Korean Patent Laid-Open No. 10-2001-58167 have been developed.

Korean Patent Laid-Open Publication No. 10-2001-58167 discloses that the light source irradiated by piercing a plurality of through holes in the light guide plate diffuses while bumping into the through hole, thereby improving the illuminance of the backlight.

However, in this method, since the through hole penetrates through the upper and lower portions of the light guide plate, the light reaching the through hole can not be diffused to the both sides of the through hole. Therefore, since the conventional backlight structure is concentratedly illuminated only on the upper portion of the through hole, the entire light guide plate can not be uniformly emitted.

Korean Patent Laid-Open Publication No. 10-2001-58167 discloses a backlight structure in which a plurality of grooves opened to the lower end side of a light guide plate are formed at equal intervals, and a plurality of light scattering balls are embedded in these grooves.

In the conventional backlight structure, the light emitted from the light source strikes the light scattering balls embedded in the plurality of grooves and grooves to scatter light, so that the light is uniformly diffused to one side of the light guide plate. However, in the conventional backlight structure, the size and spacing of the grooves are constant, and accordingly, a relatively large amount of light is irradiated in the groove adjacent to the light source, but the amount of light reaching as the grooves are moved away from the light source is relatively reduced. Therefore, the portion of the light guide plate close to the light source has high illuminance, while the portion of the light guide plate away from the light source has low illuminance.

Such a conventional backlight structure has to incorporate a plurality of balls for light scattering in a plurality of grooves formed at equal intervals, so that the number of parts and assemblies increases, resulting in a decrease in productivity and an increase in the unit price of products.

Korean Patent Publication No. 10-2001-58167 Korean Patent Publication No. 10-2001-58167

An object of the present invention to solve such a problem is to provide a backlight structure which is very convenient to maintain, such as replacing a lamp in the field, and is improved in light diffusibility.

It is another object of the present invention to provide a backlight structure in which assembly of the backlight is greatly simplified, thereby greatly improving the assemblability.

Another object of the present invention is to provide a backlight structure in which the inner surface of the diffusing plate is uniformly emitted because the more diffuse reflection occurs in the dark part of the inner surface of the diffusing plate when the light is irradiated from the light source.

According to an aspect of the present invention, there is provided a backlight structure including: a diffusion plate for diffusing irradiated light to the outside; A lower plate spaced from the diffusion plate so as to secure an irradiation space and reflecting the light diffused into the irradiation space toward the diffusion plate; Housings which are coupled to the periphery of the diffusion plate and the lower plate to fix them and secure an irradiation space between the diffusion plate and the lower plate; And a light source coupled to the housing of any one of the four housings and irradiating light into the irradiation space; A diffuser is formed on the diffuser plate so that the diffuser diffuses when the light irradiated from the light source to the irradiation space hits the surface of the diffuser plate; A housing reflector is installed on the surface of the mounting portion of the other housing facing the housing provided with the light source so that the light irradiated from the light source is reflected toward the irradiation space side; And a lower plate reflector is provided on the upper surface of the lower plate so that light irradiated from the light source is reflected toward the irradiation space side.

Another characteristic of the backlight structure of the present invention is that the housing is formed with coupling grooves such that the end portions of the diffusion plate and the lower plate are inserted into the upper and lower portions when viewed from the cross section, and the light source fitting portions are formed between the pair of coupling grooves have.

Another feature of the backlight structure of the present invention is that the inner surface of the diffuser plate has a first diffusing surface which is located between the light sources and which forms a blind spot out of the angle of light irradiation and which is darkest among the inner surfaces of the diffuser plate, The second diffused surface corresponding to the inner surface of the third portion from the light source and the second darkest of the inner surfaces of the diffuser plate and the inner surface of the diffuser plate are divided into four halves A third diffusing surface corresponding to the inner surface of the fourth portion from the light source and the third darkest among the inner surfaces of the diffusing plate and a third diffusing surface located between the light source and the light source and formed on the inner surface of the diffusing plate along the longitudinal direction of the diffusing plate The fourth diffusing surface being the fourth darkest among the inner surfaces of the diffusing plate; Diffusing grooves are formed on the first to fourth diffusing surfaces so that light irradiated from the light source is irregularly reflected, and the number of diffusely reflecting grooves per unit area differs from the fourth diffusing surface to the third diffusing surface, the second diffusing surface, As shown in FIG.

As described above, according to the present invention, there are provided a diffuser plate for diffusing irradiated light to the outside, a bottom plate spaced apart from the diffuser plate so as to secure an irradiation space, housings which are coupled to the peripheries of the diffuser plate and the bottom plate, The diffusion plate is formed with a diffusion part for diffusing light emitted from the light source into the irradiation space when the diffusion plate hits the surface of the diffusion plate. A housing reflector is provided on the surface of the mounting portion of the other housing opposite to the housing in which the light source is installed so that the light irradiated from the light source is reflected toward the irradiation space side. The lower plate reflector is installed. Therefore, since the light source is installed only on one side of the housing, the maintenance of the lamp is very convenient, such as replacing the lamp in the field, and the light source radiates an irradiation space having a very good light diffusion. Thus, the light diffusing property is improved, and the diffuser, So that even if the light source is irradiated only from one side of the backlight, the entire diffusion plate is made to emit light evenly.

In addition, the housing of the present invention is formed with coupling grooves for respectively inserting the end portions of the diffusion plate and the lower plate at the upper and lower portions when viewed from the cross section, and the light source fitting portion is formed between the pair of coupling grooves. Therefore, when the light sources are assembled into one housing and the housings are pushed around the diffusion plate and the lower plate, the backlight structure securing the irradiation space is assembled, and screws and the like are fastened to the housing, the diffusion plate and the lower plate. Therefore, the assemblability is greatly improved because the entire assembly of the backlight is very simple.

The first diffusing surface to the fourth diffusing surface are formed on the inner surface of the diffusing plate of the present invention. The first diffusing surface to the fourth diffusing surface are formed with four diffused portions. And the number of irregularly reflecting grooves per unit area is gradually increased from the fourth diffusion surface toward the third diffusion surface, the second diffusion surface, and the first diffusion surface. Therefore, the most diffusely irregular grooves are formed on the darkest first diffusing surface among the inner surfaces of the diffuser plate, the second most diffusely irregular grooves are formed on the dark second diffusing surface, the third dark diffusing surface And the fourth most diffusely reflective groove is formed on the dark fourth diffusing surface. Therefore, when the light is irradiated from the light source, more diffuse reflection occurs in the dark part of the inner surface of the diffusing plate, so that the inner surface of the diffusing plate is uniformly emitted, thereby uniformly emitting the entire diffusing plate.

1 is a schematic exploded perspective view showing the backlight structure of the present invention.
Figure 2 is a cross-
Figure 3 is a schematic plan view of Figure 2;
4 is a schematic plan view showing a diffusion plate in a state in which light is irradiated from a light source
5 is a schematic plan view showing a state where different numbers of irregularly reflecting grooves are formed per unit area on the first to fourth diffusing surfaces formed on the inner surface of the diffuser plate

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Fig. 1 is a schematic exploded perspective view showing the backlight structure of the present invention, Fig. 2 is an engagement sectional view of Fig. 1, and Fig. 3 is a schematic plan view of Fig. FIG. 4 is a schematic plan view showing a diffusion plate in a state in which light is irradiated from a light source, FIG. 5 is a schematic view showing a state in which a different number of irregular reflection grooves are formed per unit area on the first diffusion surface to the fourth diffusion surface, Fig.

The present invention is constituted by a hot spot type spotlight illumination method in which a reflector (not shown) is attached to each of the edge type LED light sources 40 and directly transmits most of the light amount of the LED light sources 40 directly.

Also, since the length of the hotspot can be extended by using the LED light source 40 on one side of the backlight structure and by using the LED light source 40 of high luminance LED, that is, 350 mA or more, a high luminance large backlight can be realized. Such a backlight structure can realize a large size advertising signboard or a rooftop advertisement signboard and can reduce the power consumption by using the LED light source 40, so that the energy saving effect can be expected when applied to a large advertisement signboard. In addition, it has advantages such as easy manufacturing and cost reduction, simplification of assembly process, ease of transportation and effective construction. Since the replacement of the light source 40 is simple, replacement of the light source 40 for maintenance is simple.

Since the light source 40 is installed only on one side of the housing 30, it is very convenient to maintain the lamp 40 such as replacing the lamp in the field. Even if the light source 40 is irradiated from only one side of the backlight, And the entire assembly is very simple.

The backlight structure of the present invention will be described in detail as follows.

The backlight structure of the present invention comprises a diffusion plate 10, a lower plate 20, a housing 30, and a light source 40.

The diffusion plate 10 diffuses the irradiated light to the outside. The inner surface of the diffusion plate 10 is located between the light sources 40 and has a darkest first diffusing surface 11 which is the darkest of the inner surfaces of the diffusing plate 10, When the inner surface of the diffuser plate 10 is divided into four equal parts in the lateral direction, the second diffuser surface 12 corresponding to the inner surface of the third portion from the light source and darkest in the inner surface of the diffuser plate 10, The third diffused surface 13 corresponding to the inner surface of the fourth portion from the light source 40 and darkest among the inner surfaces of the diffuser plate 10 A fourth diffuser plate 10 positioned between the light source 40 and the light source 40 and formed on the inner surface of the diffuser plate 10 along the longitudinal direction of the diffuser plate 10, And a surface 14.

The diffusive grooves 16 are formed on the first to fourth diffusing surfaces 14 to diffuse the light emitted from the light sources so that the number of the diffusing grooves 16 per unit area becomes equal to the number of the diffusing surfaces 14, The second diffusing surface 12, and the first diffusing surface 11 of the first diffusing surface 13, the third diffusing surface 13, the second diffusing surface 12, and the first diffusing surface 11, respectively.

The lower plate 20 is provided so as to be spaced apart from the diffusion plate 10 so as to secure the irradiation space 50 and reflects the light diffused into the irradiation space 50 toward the diffusion plate 10 side.

The housing 30 is coupled to the periphery of the diffusion plate 10 and the lower plate 20 to fix them and to secure the irradiation space 50 between the diffusion plate 10 and the lower plate 20. [ The housing 30 is formed with coupling grooves 32 so that end portions of the diffusion plate 10 and the lower plate 20 are inserted into the upper and lower portions of the housing 30 with respect to the transverse section, (40).

The light source 40 is coupled to the housing 30 of any one of the housings 30 arranged in four directions and irradiates light into the irradiation space 50.

The diffusion plate 10 is formed with a diffusion portion 15 so that the light diffused when the light irradiated from the light source 40 to the irradiation space 50 hits the surface of the diffusion plate 10. A housing reflector 31 is installed on the surface of the mounting portion 33 of the other housing 30 facing the housing 30 in which the light source 40 is installed so that the light emitted from the light source 40 is reflected toward the irradiation space 50 . A lower plate reflector 21 is provided on the upper surface of the lower plate 20 so that the light emitted from the light source 40 is reflected toward the irradiation space 50 side.

Reference numerals 34 denote fixing brackets for engaging the housings 30 by being coupled to the corners of the housings 30.

The backlight structure of the present invention has the following features.

A diffuser plate 10 for diffusing the irradiated light to the outside and a lower plate 20 spaced apart from the diffuser plate 10 so as to secure the irradiation space 50; And a light source 40 which is coupled to the housing 30 of any one of the housings 30 arranged in a four-sided manner, and the diffuser plate 30 10 is formed with a diffusion portion 15 for diffusing light emitted from the light source 40 to the irradiation space 50 when it hits the surface of the diffusion plate 10.

A housing reflector 31 is provided on the surface of the mounting portion 33 of the other housing 30 facing the housing 30 on which the light source 40 is installed so that light irradiated from the light source 40 is reflected toward the irradiation space 50. [ And a lower plate reflector 21 is provided on the upper surface of the lower plate 20 so that the light emitted from the light source 40 is reflected toward the irradiation space 50 side.

Therefore, since the light source 40 is installed only on one side of the housing 30, it is very convenient to perform maintenance such as replacing the lamp in the field, and the light source 40 irradiates the irradiation space 50 with excellent light diffusion, And the light diffusing is further improved by the diffusion part 15, the housing reflector 31 and the lower plate reflector 21 so that even if the light source 40 is irradiated from only one side of the backlight, Illuminates evenly.

Second, the housing 30 of the present invention is formed with coupling grooves 32 so that the ends of the diffusion plate 10 and the lower plate 20 are inserted into upper and lower portions of the housing 30, A mounting portion 33 for coupling the light source 40 is formed.

Therefore, when the light sources 40 are assembled in one housing 30 and the housings 30 are pushed around the diffusion plate 10 and the lower plate 20, the backlight structure securing the irradiation space 50 is assembled, The housing 30, the diffuser plate 10 and the lower plate 20 are fastened with screws or the like. Therefore, the assemblability is greatly improved because the entire assembly of the backlight is very simple.

The first diffusing surface 11 to the fourth diffusing surface 14 are formed on the inner surface of the diffusing plate 10 according to the present invention. Diffusing grooves 16 are formed in the diffusing surface 14 so that the light irradiated from the light source 40 is irregularly reflected and the number of the diffusely reflecting grooves 16 per unit area is changed from the fourth diffusing surface 14 to the third diffusing surface 14 13, the second diffusion surface 12, and the first diffusion surface 11, respectively.

Therefore, the most diffuse reflection grooves 16 are formed on the darkest first diffusing surface 11 of the inner surface of the diffuser plate 10 and the second most diffusely diffusive grooves 16 are formed on the second dark diffusing surface 12, A fourth diffusing surface 16 is formed on the third diffusing surface 13 and a fourth diffusely diffusing groove 16 is formed on the fourth diffusing surface 14 which is the fourth most. (16) is formed.

Therefore, when the light is irradiated from the light source 40, more diffuse reflection occurs in the dark part of the inner surface of the diffusion plate 10, so that the inner surface of the diffusion plate 10 is uniformly emitted, ) Is uniformly emitted.

On the other hand, the outer surface of the housing 30 provided with the light source may be coated with a discoloring portion that changes color depending on the temperature. The discoloring portion is coated on the surface of the housing 30 with two or more color-changing substances whose color changes when the temperature is equal to or higher than a predetermined temperature, and is separated into two or more sections according to the temperature change, A protective film layer is coated on the discolored portion to prevent the discolored portion from being damaged.

Here, the discoloring portion may be formed by coating a temperature-discoloring material having a discoloration temperature of 40 DEG C or more and 60 DEG C or more, respectively. The discoloring portion is for detecting a change in the temperature of the paint by changing the color according to the temperature of the housing 30. [

The discoloring portion may be formed by coating a surface of the housing 30 with a color-changing material whose color changes when the temperature of the discoloring portion becomes a predetermined temperature or more. In addition, the temperature discoloring substance is generally composed of a microcapsule structure having a size of 1 to 10 탆, and the microcapsules can exhibit a colored and transparent color due to the bonding and separation phenomenon depending on the temperature of the electron donor and the electron acceptor.

In addition, the temperature-changing materials can change color quickly and have various coloring temperatures such as 40 ° C, 60 ° C, 70 ° C, and 80 ° C, and such coloring temperature can be easily adjusted by various methods. Such a temperature-coloring material may be various kinds of temperature-coloring materials based on principles such as molecular rearrangement of an organic compound and spatial rearrangement of an atomic group.

For this purpose, it is preferable that the discoloring portion is formed so as to be separated into two or more sections according to the temperature change by coating two or more temperature discoloring materials having different discoloration temperatures. The temperature-coloring layer preferably uses a temperature-coloring material having a relatively low temperature of the discoloration temperature and a temperature-discoloring material having a relatively high discoloration temperature, more preferably a discoloration temperature of not lower than 40 ° C and not lower than 60 ° C A color change portion can be formed by using a temperature coloring material.

Accordingly, the change in the temperature of the housing 30 can be checked step by step, and the temperature change of the light source 40 can be detected. Accordingly, the light source 40 can be operated in an optimum state, 40 can be prevented from being damaged.

In addition, the protective film layer is coated on the discolored portion to prevent the discolored portion from being damaged due to the external impact, and it is easily confirmed whether the discolored portion is discolored or not, and at the same time, the transparent discoloration material .

The outer surface of the diffusion plate 10 may be coated with a coating composition for antifouling coating so as to effectively prevent and remove the adhesion of the contaminants. The composition for antifouling coating contains boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2, and the total content of boric acid and sodium carbonate is 1 to 10% by weight based on the total aqueous solution. In addition, sodium carbonate or calcium carbonate may be used as the material for improving the coating property of the coating layer, but sodium carbonate is preferably used. The molar ratio of boric acid to sodium carbonate is preferably 1: 0.01 to 1: 2. If the molar ratio is out of the above range, the coating property of the substrate may be decreased or the moisture adsorption on the surface of the coating may increase.

The boric acid and sodium carbonate are preferably used in an amount of 1 to 10% by weight based on the total weight of the composition. When the amount is less than 1% by weight, the coating properties of the base material deteriorate. When the amount exceeds 10% by weight, easy to do.

On the other hand, as a method of coating the composition for antifouling coating on a substrate, it is preferable to coat it by a spray method. The thickness of the final coating film on the substrate is preferably 500 to 2000 angstroms, and more preferably 1000 to 2000 angstroms. When the thickness of the coating film is less than 500 ANGSTROM, there is a problem that it deteriorates in the case of a high-temperature heat treatment. When the thickness of the coating film is more than 2000 ANGSTROM, crystallization of the coating surface tends to occur.

Further, the composition for antifouling coating may be prepared by adding 0.1 mol of boric acid and 0.05 mol of sodium carbonate to 1000 mL of distilled water and then stirring.

The fixing bracket 34 may be made of a ductile cast iron. This dough tile cast iron is heated to 1600 ~ 1650 캜 to be molten, then subjected to desulfurization treatment, spherodizing treatment agent containing 0.3 ~ 0.7% by weight of magnesium, spheronized at 1500 ~ 1550 캜, and heat treated.

Dough tile cast iron is a cast iron in which graphite is spherically crystallized during the solidification process by adding magnesium and the like to the molten metal of the common gray cast iron, so the shape of the graphite is spherical compared to gray cast iron. Since the ductile cast iron has a less notch effect, the stress concentration phenomenon is reduced and the strength and toughness are greatly improved.

The fixing bracket 34 of the present invention is formed by melting a cast iron of duck tile 1600 to 1650 캜 into a molten metal, subjecting it to desulfurization, adding a spheroidizing agent containing magnesium in an amount of 0.3 to 0.7% by weight, Followed by heat treatment.

Here, when the cast iron of the duck tile is heated to less than 1600 ° C, the entire structure is not sufficiently melted. If the cast iron is heated above 1650 ° C, unnecessary energy is wasted. Therefore, it is desirable to heat the dirt tile cast iron to 1600 ~ 1650 ℃.

If the amount of magnesium is less than 0.3 wt%, the effect of injecting the spheroidizing agent is negligible. If the amount of magnesium is more than 0.7 wt%, the effect of injecting spheroidizing agent There is a problem in that an expensive material cost is increased. Therefore, the mixing ratio of magnesium in the spheroidizing agent is preferably about 0.3 to 0.7% by weight.

When the spheroidizing treatment agent is injected into the molten dull tile cast iron, it is subjected to spheroidizing treatment at 1500~1550 ° C. If the spheroidizing treatment temperature is lower than 1500 ° C., the spheroidizing treatment is not properly performed. If the spheroidizing treatment temperature is higher than 1550 ° C., the spheroidizing treatment effect is not greatly improved, but unnecessary energy is wasted. Therefore, the spheroidization treatment temperature is preferably 1500 to 1550 ° C.

Since the fixing bracket 34 of the present invention is made of the ductile cast iron, the stress concentration phenomenon is reduced because of the small notch effect, and the strength and toughness are greatly improved.

Further, the diffusion plate 10 may be formed of a polypropylene resin composition having excellent impact resistance against external impact or external environment. The polypropylene resin composition comprises a polypropylene random block copolymer composed of 75 to 95% by weight of an ethylene-propylene-alphaolefin random copolymer and 5 to 25% by weight of an ethylene-propylene block copolymer having an ethylene content of 20 to 50% by weight .

The polypropylene random block copolymer is preferably 75 to 95% by weight of the ethylene-propylene-alphaolefin random copolymer and 5 to 25% by weight of the ethylene-propylene block copolymer. The ethylene- When the content of the ethylene-propylene block copolymer is less than 5% by weight, the impact resistance is deteriorated. When the content of the ethylene-propylene block copolymer is more than 25% by weight, the rigidity is deteriorated do. Wherein the ethylene-propylene-alpha olefin random copolymer comprises 0.5 to 7% by weight of ethylene and 1 to 15% by weight of an alpha-olefin having 4 to 5 carbon atoms and improves mechanical stiffness and heat resistance of the polypropylene resin composition, As shown in Fig. The ethylene content is preferably from 0.5 to 5% by weight, more preferably from 1 to 3% by weight. When the content of ethylene is less than 0.5% by weight, the whitening resistance is deteriorated. When the content is more than 7% by weight, .

Further, the alpha olefin means any alpha olefin except ethylene and propylene, and is preferably butene. When the number of carbon atoms is less than 4 or more than 5, the reactivity of the alpha-olefin with the comonomer is low during the production of the random copolymer, making it difficult to produce the copolymer. Further, it may contain 1 to 15% by weight, preferably 1 to 10% by weight, and more preferably 3 to 9% by weight of the above-mentioned alpha olefin. If the amount of the alpha-olefin is less than 1% by weight, the crystallinity becomes higher than necessary and the transparency is lowered. When the amount of the alpha-olefin is more than 15% by weight, the crystallinity and rigidity are lowered and the heat resistance is significantly lowered.

In addition, the ethylene-propylene block copolymer contains 20 to 50% by weight of ethylene and imparts impact resistance to the polypropylene resin composition and enables finely dispersing, thereby imparting both whitening resistance and transparency. The ethylene content may preferably be 20 to 40% by weight, and if it is less than 20% by weight, the impact resistance is deteriorated. If it exceeds 50% by weight, the impact resistance and whitening resistance may be deteriorated.

As described above, since the diffusion plate 10 of the present invention is made of the polypropylene resin composition, the impact resistance against the external impact or the external environment is greatly improved.

In addition, the housing reflector 31 and the lower plate reflector 21 may be made of light diffusing paper. This light diffusing layer is formed by a protective sheet attached to the housing 30 and the lower plate 20 to protect them, an adhesive layer adhered to one surface of the protective sheet, and a light diffusion sheet provided on one surface of the adhesive layer, And diffusive protrusions formed on one surface of the light diffusion layer so that light emitted from the light source 40 is diffused and diffused to the periphery.

Here, the light diffusing film is coated with an adhesive agent, spherical lenses for diffusing the transmitted light are attached to the adhesive agent, and the adhesive agent and the spherical lens are protected on the surface of the adhesive agent, A plastic layer is attached.

Accordingly, the light emitted from the light source 40 is uniformly diffused by the diffusing film and the spherical lenses in which the diffusive projections are formed, and the entire diffusing plate 10 is made to emit light. Accordingly, It can be kept constant.

10: diffusion plate 11: first diffusion surface
12: second diffusing surface 13: third diffusing surface
14: fourth diffusion surface 15: diffusion part
16: diffuse reflection groove 20: lower plate
21: lower plate reflector 30: housing
31: Housing Reflector 32: Coupling groove
33: mounting part 34: fixing bracket
40: light source 50: irradiation space

Claims (3)

A diffusion plate (10) for diffusing the irradiated light to the outside;
A lower plate 20 spaced apart from the diffusion plate 10 so as to secure the irradiation space 50 and reflecting the light diffused into the irradiation space 50 toward the diffusion plate 10;
Housings (30) coupled to the periphery of the diffusion plate (10) and the lower plate (20) to fix them and to secure an irradiation space (50) between the diffusion plate (10) and the lower plate (20);
And a light source (40) coupled to the housing (30) of any one of the housings (30) arranged in all directions and irradiating light into the irradiation space (50);
The diffusion plate 10 is formed with a diffusion portion 15 so that the light diffused when the light irradiated from the light source 40 to the irradiation space 50 hits the surface of the diffusion plate 10;
A housing reflector 31 is installed on the surface of the mounting portion 33 of the other housing 30 facing the housing 30 in which the light source 40 is installed so that the light emitted from the light source 40 is reflected toward the irradiation space 50 ;
A lower plate reflector 21 is installed on the upper surface of the lower plate 20 so that light emitted from the light source 40 is reflected toward the irradiation space 50;
The housing (30)
A coupling groove 32 is formed in the upper and lower portions of the lower plate 20 so as to insert the end portions of the diffusion plate 10 and the lower plate 20 with respect to the transverse section, (33) are formed;
The inner surface of the diffusion plate (10)
The first diffusing surface 11 and the inner surface of the diffusing plate 10 which are located between the light sources 40 and form a dead zone deviated from the angle of light irradiation and are darkest among the inner surfaces of the diffusing plate 10, The second diffused surface 12 which corresponds to the inner surface of the third portion from the light source and is darkest in the inner surface of the diffuser plate 10 and the inner surface of the diffuser plate 10 in the horizontal direction The third diffused surface 13 corresponding to the inner surface of the fourth portion from the light source 40 and third in the inner surface of the diffuser plate 10 and the third diffused surface 13 between the light source 40 and the light source 40 And a fourth dark diffused surface (14) formed on the inner surface of the diffuser plate (10) along the longitudinal direction of the diffuser plate (10) and fourth in the inner surface of the diffuser plate (10);
The diffusive grooves 16 are formed on the first to fourth diffusing surfaces 14 to diffuse the light emitted from the light sources so that the number of the diffusing grooves 16 per unit area becomes equal to the number of the diffusing surfaces 14, The second diffusing surface 12, and the first diffusing surface 11 of the first diffusing surface 13, the third diffusing surface 13, the second diffusing surface 12, and the first diffusing surface 11;
The discoloring unit changes color depending on the temperature on the outer surface of the housing 30 where the light source is installed. The discoloring unit is coated on the surface of the housing 30 with two or more temperature-coloring materials whose color changes when the temperature is higher than a predetermined temperature And a protective film layer is coated on the discoloring part to prevent a discoloration part from being damaged.
The coating composition for antifouling coating comprises boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2, and the thickness of the coating layer is Wherein the thickness of the backlight structure is 500 to 2000 ANGSTROM. delete delete

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