KR20140059447A - Illuminating device - Google Patents

Abstract

A resin layer formed on the printed circuit board and embedding the light source unit; a resin layer formed on the printed circuit board and the resin layer, the resin layer being formed on the printed circuit board, The light source unit includes at least one light source array in which a plurality of light sources are disposed, thereby achieving the effect of reducing the overall thickness and securing flexibility of the light source unit Accordingly, not only the effect of improving the degree of design freedom in product designing but also various arrangements of light sources according to the luminous flux and the directing angle are possible, thereby maximizing the uniformity of the entire surface light source.

Description

ILLUMINATING DEVICE

The present invention relates to a lighting device, and more particularly, to a lighting device that can reduce the thickness of a light guide plate to reduce a thickness of a light guide plate, secure a light efficiency, control hot spots by arranging various light sources, and maximize the uniformity of the entire light source To a structure of a lighting device.

The LED (Light Emitted Diode) device is a device that converts electric signals into infrared rays or light using compound semiconductor characteristics. Unlike fluorescent light, unlike harmful substances such as mercury, it does not cause environmental pollution, It has a long lifetime advantage. In addition, it consumes low power compared to conventional light sources, has high visibility due to high color temperature, and has a small glare.

Therefore, the current illumination device has been developed to use a conventional light source such as a conventional incandescent lamp or a fluorescent lamp as a light source. In particular, as disclosed in Korean Patent Laid-Open No. 10-2012-0009209, A light emitting device that performs a surface light emitting function is provided.

1 and 2 schematically show a conventional lighting apparatus 1 which performs a surface light emitting function. 1 and 2, a conventional lighting apparatus 1 includes a substrate 20 on which a planar light guide plate 30 is disposed and a plurality of side-type LEDs 10 (only one is shown) Are arranged in an array form.

The light L incident on the light guide plate 30 from the LED 10 is reflected by the reflective sheet 40 in a fine reflection pattern provided on the bottom surface of the light guide plate 30 and is emitted from the light guide plate 30, 30 to provide light to the outside through the transparent outer housing 50 and the like. 2, a plurality of diffusion sheets 31, prism sheets 32, 33, and a protective sheet 34, etc. are provided between the light guide plate 30 and the outer housing 50, The optical sheet of the present invention may be further added.

The light guide plate 30 functions to improve the brightness of the illumination device 1 and to supply uniform light. The light guide plate 30 is provided with a light source It is one of the plastic molded lenses that uniformly transmits the diverging light. Therefore, although the light guide plate 30 is basically used as an essential part of the conventional lighting apparatus 1, the thickness of the overall product can be reduced due to the thickness of the light guide plate 30 itself, It is difficult to apply to the outer housing 50 formed by bending due to the inability of its own material to be flexible, and thus the product design and deformation of the design are not easy.

Korean Patent Publication No. 10-2012-0009209

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to reduce the thickness of the entire light source by guiding light emitted from the light source unit to the outside by using a resin layer without using a light guide plate, And it is an object of the present invention to provide a lighting device structure capable of maximizing the uniformity of the entire light source by arranging the light sources in consideration of the distribution, thereby realizing an optimal surface emission image quality.

Another object of the present invention is to provide a structure of a lighting apparatus which can ensure reliability while improving the degree of freedom of product design by making the lighting apparatus itself flexible.

According to an aspect of the present invention, there is provided a lighting apparatus comprising: a printed circuit board; A light source unit formed on the printed circuit board; A resin layer formed on the printed circuit board and embedding the light source unit; And a reflective sheet formed between the printed circuit board and the resin layer and penetrating the light source unit. The light source unit may include at least one light source array in which a plurality of light sources are disposed.

In the illumination apparatus of the present invention, the light source array may be arranged in a line with a plurality of light sources at predetermined intervals.

In the illumination apparatus of the present invention, the light source unit may be composed of a first light source array and a second light source array which are electrically insulated and driven separately.

In the illumination apparatus of the present invention, the interval between the first light source array and the second light source array may be 10 to 30 mm.

In the illumination apparatus of the present invention, the distance between the light sources included in the first light source array and the distance between the light sources included in the second light source array may be 12 to 30 mm.

In the illumination apparatus of the present invention, the light sources included in the first light source array and the light sources included in the second light source array may be arranged in a zigzag manner.

In the illumination apparatus of the present invention, the light sources included in the first light source array and the light sources included in the second light source array may be arranged in a one-to-one correspondence.

In the illumination apparatus of the present invention, the light sources included in the first and second light source arrays may be individually driven.

In the illumination apparatus of the present invention, a plurality of light sources may be irregularly arranged in any one of the first light source array and the second light source array.

In the illumination apparatus of the present invention, the light emitting directions of the light sources included in the first light source array and the light sources included in the second light source array may be different from each other.

In the illumination apparatus of the present invention, the light flux of the light sources included in the first light source array may be different from the light flux of the light sources included in the second light source array.

In the illumination device of the present invention, the light source may be a side view type light emitting diode.

In the illumination device of the present invention, a reflection pattern may be formed on the reflection sheet.

In the illuminating device of the present invention, a diffusion plate may be formed on the resin layer.

In the illumination device of the present invention, an air gap may be formed between the resin layer and the diffusion plate.

The illumination device of the present invention may further include an optical sheet formed between the resin layer and the diffusion plate and dispersing light emitted therefrom.

In the illumination device of the present invention, the resin layer may be formed of silicon, silica, glass bubble, PMMA, urethane, Zn, Zr, Al ₂ O ₃ , acryl, And a bead made of any one selected from among the beads.

In the lighting apparatus of the present invention, the printed circuit board may be a flexible printed circuit board.

According to the present invention, by removing the light guide plate and guiding light by using the resin layer, it is possible to reduce the number of light sources and to reduce the overall thickness of the lighting apparatus.

Further, according to the present invention, flexibility can be ensured by forming a lighting device using a flexible printed circuit board and a resin layer, and various arrangements of light sources are possible, thereby maximizing the uniformity of the entire surface light source, Can be increased.

In addition, according to the present invention, by providing a reflection sheet and a reflection pattern, which are structures that can efficiently reflect light emitted from the light source unit, it is possible to maximize the luminance improvement as well as improve the reflectance of light, and provide a uniform planar light source There is an effect that can be done.

Figures 1 and 2 schematically illustrate a conventional illumination device structure.
3 shows a main part of a lighting apparatus according to the present invention.
FIGS. 4 to 10 are plan views illustrating embodiments of a structure in which light sources are arranged. FIG.
11 shows a structure in which a diffusion plate is added to the illumination apparatus of the present invention shown in Fig.
Fig. 12 shows a structure in which a reflection pattern is added to the illumination apparatus of the present invention shown in Fig.
13 shows a structure in which an optical substrate is added to the illumination device of the present invention shown in Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the embodiments described herein and the configurations shown in the drawings are only a preferred embodiment of the present invention, and that various equivalents and modifications may be made thereto at the time of the present application. DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention. The following terms are defined in consideration of the functions of the present invention, and the meaning of each term should be interpreted based on the contents throughout this specification. The same reference numerals are used for portions having similar functions and functions throughout the drawings.

The present invention relates to a lighting apparatus using an LED as a light source, and a structure that can reduce the total thickness of the lighting apparatus, ensure flexibility, and reduce the number of light sources by removing the light guide plate and replacing it with a resin layer To be provided.

In addition, the lighting device according to the present invention is applicable to various lamp devices requiring illumination, such as a vehicle lamp, a domestic lighting device, and an industrial lighting device. For example, when it is applied to a vehicle lamp, it can be applied to a headlight, a vehicle interior light, a door scarf, a rear light, and the like. In addition, the illumination device of the present invention can be applied to a backlight unit field applied to a liquid crystal display device, and can be applied to all lighting-related fields that are currently developed, commercialized, or can be implemented according to future technology development.

3 shows a main part of a lighting apparatus according to the present invention.

3, a lighting apparatus 100a according to the present invention includes a light source unit including a printed circuit board (PCB) 110 and a plurality of light sources 130 formed on a printed circuit board 110, A resin layer 150 formed to fill the light source unit and guide the light to be emitted to the diffusion plate 290, and a structure formed between the printed circuit board 110 and the resin layer and penetrated by the light source unit And a reflective sheet 120 formed of a transparent material.

The printed circuit board 110 may be a flexible printed circuit board (FPCB) to secure certain flexibility in the present invention.

The light source unit is a part where a plurality of light sources 130 are arranged on a printed circuit board 110 to emit light, and the light source 130 of the present invention may be a side view type light emitting diode. That is, the light emitting diode of the present invention can be used as the light source 130 of the present invention, in which the direction of the emitted light is not directly directed upward but is emitted toward the side. According to the illumination apparatus 100a of the present invention, the light source unit including the side-type light emitting diode is directly disposed, and the light is diffused in the direction of the diffusion plate 290 using the resin layer that implements the light diffusion and reflection function It is possible to reduce the total number of light sources and to innovatively reduce the total weight and thickness of the lighting apparatus. In addition, the present invention can maximize the uniformity of the entire light source 130 by controlling the hot spot while maximally utilizing the light flux and the light distribution of the light source 130 by variously arranging the arrangement of the light sources 130 . The arrangement of the light sources 130 will be described in detail with reference to FIGS. 4 to 10 below.

The resin layer 150 is formed on the printed circuit board 110 and the light source unit 130. The resin layer 150 spreads the light emitted from the light source unit forward. That is, the resin layer 150 is formed in a structure that embeds the light source unit, thereby performing the function of dispersing the light emitted laterally in the light source unit. That is, the function of the conventional light guide plate can be performed in the resin layer 150.

The resin layer 150 of the present invention can be basically made of a resin capable of diffusing light. For example, the resin layer 150 of the present invention may be formed of a resin which is an ultraviolet curable resin including an oligomer. More specifically, the resin layer 150 may be formed using a resin having a urethane acrylate oligomer as a main material. For example, a resin obtained by mixing a synthetic oligomer, a urethane acrylate oligomer and a polyacrylic polymer type, may be used. Of course, it may further comprise a monomer mixed with a low-boiling-point diluent type reactive monomer such as isobornyl acrylate (IBOA), hydroxypropyl acrylate (HPA), or 2-hydroxyethyl acrylate (HPA). A photoinitiator -hydroxycyclohexyl phenyl-ketone, etc.) or an antioxidant, etc. However, the above description is merely one example, and it is also possible to perform a light diffusing function which is currently developed, commercialized, The resin layer 150 of the present invention can be formed with all of the resins having the above-described structure.

The resin layer 150 of the present invention may further include a plurality of beads 151 having hollows (or voids) formed therein in a mixed and diffused form. The beads 151 may reflect and diffuse light, It plays a role of improving the characteristics. For example, when the light emitted from the light source unit is incident on the bead 151 inside the resin layer 150, the light is reflected and transmitted by the hollow of the bead 151 to be diffused and condensed, Edition). At this time, the reflectance and diffusivity of light are increased by the beads 151, so that the light quantity and the uniformity of the outgoing light supplied to the diffusion plate are improved, and as a result, the luminance of the illumination device can be improved.

The bead 151 may be appropriately adjusted to obtain a desired light diffusion effect. More specifically, the bead 151 may be adjusted in a range of 0.01 to 0.3% based on the weight of the entire resin layer 150, but is not limited thereto . That is, the light emitted laterally from the light source 130 is diffused and reflected through the resin layer 150 and the bead 151, and can proceed in the upward direction. The beads 151 may be made of any one selected from the group consisting of sillicon, silica, glass bubble, PMMA, urethane, Zn, Zr, Al ₂ O ₃ , And the diameter of the beads 151 may be in the range of 1 占 퐉 to 20 占 퐉, but the present invention is not limited thereto.

According to the present invention, since the thickness of the conventional light guide plate can be reduced by the presence of the resin layer 150, the entire product can be thinned, and a flexible material can be obtained. The advantage of being easily applied, the advantage of improving the degree of freedom of design, and the advantage of being applicable to other flexible displays.

The reflective sheet 120 is formed on the upper surface of the printed circuit board 110 and has a structure in which the light source unit is formed to pass through. The reflective sheet 120 of the present invention is formed of a material having a high reflection efficiency, thereby reflecting light to the upper portion of the light emitted from the light source 130, thereby reducing light loss. The reflective sheet 120 may be formed in a film form, and may include a synthetic resin dispersedly containing a white pigment in order to realize light reflection characteristics and light scattering characteristics. Examples of the white pigment include titanium oxide, aluminum oxide, zinc oxide, lead carbonate, barium sulfate, calcium carbonate and the like. As the synthetic resin, polyethyleneterephthalate, polyethylene naphthalate, acrylic resin, colicarbonate, polystyrene, polyolefin , Cellulosic acid acetate, weather-resistant vinyl chloride, and the like can be used, but the present invention is not limited thereto.

A reflection pattern may be formed on the surface of the reflection sheet 120, and the reflection pattern will be described below with reference to FIG.

FIGS. 4 to 10 are plan views illustrating embodiments of a structure in which light sources are arranged. FIG.

Referring to FIG. 4, the light source unit includes a plurality of light sources 130, and at least one light source array in which the plurality of light sources 130 are disposed. The light source unit may be composed of 1 to N (N is a natural number of 2 or more) light source arrays, and in FIG. 4, the light source unit is composed of the first light source array X1 and the second light source array X2 .

The first light source array X1 and the second light source array X2 which are adjacent to each other are electrically insulated from each other and can be individually driven. Also, the light sources 130 included in the first and second light source arrays X1 and X2 may be electrically insulated from each other and individually driven. For example, the light sources 130 included in the first light source array X1 are electrically connected to each other and simultaneously driven. However, the light sources 130 included in the second light source array X2 are electrically insulated from each other The light sources 130 included in the first light source array X1 are electrically connected to each other while the light sources 130 included in the second light source array X2 are electrically connected to each other and driven simultaneously. All of the light sources included in the first and second light source arrays X1 and X2 may be simultaneously driven or individually driven.

The plurality of light sources 130 included in the first and second light source arrays X1 and X2 are arranged in a row at upper and lower ends of the substrate 110 at predetermined intervals, The light sources 130 included in the light source array X1 and the second light source array X2 emit light toward the center of the substrate 110. [ The light fluxes of the light sources 130 included in the first and second light source arrays X1 and X2 may be the same or different. That is, the light fluxes of the light sources 130 included in the first light source array X1 and the light fluxes of the light sources 130 included in the second light source array X2 may be the same or different from each other. The light fluxes of the light sources 130 included in the first light source array X1 may be the same or may be different from each other and the light fluxes of the light sources 130 included in the second light source array X2 may be the same May be different.

The right and left positions of the light sources included in the first light source array X1 and the light sources 130 included in the second light source array X2 do not coincide with each other and can be arranged in a staggered manner. Accordingly, it is possible to improve the uniformity of the light while reducing the number of the light sources 130. At this time, the first light source array X1 and the second light source array X2 may be spaced apart by a predetermined distance d2, and the distance d2 may be 10 to 30 mm. The distance d1 between the light sources 130 included in the first and second light source arrays X1 and X2 may be 12 to 30 mm. When d1 is less than 12 mm and d2 is less than 10 mm, the number of light sources to be disposed increases. When d1 and d2 exceed 30 mm, dark portions are formed on the light emitting surface, resulting in a decrease in uniformity.

The light sources 130 included in the second light source array X2 are arranged on the vertical center line of the extension lines between the light sources 130 included in the first light source array X1, The arrangement can be changed to be laterally deflected.

Of course, unlike FIG. 4, the light sources included in the first and second light source arrays may be arranged corresponding to each other, though not shown in the drawings.

5, the light source unit includes light source arrays X1 to X4. Similar to FIG. 4, the light sources 130 included in the first and second light source arrays X1 and X2 are arranged in a zigzag And the light sources 130 included in the third light source array X3 and the fourth light source array X4 may be arranged in a zigzag manner. In this case, the arrangement of the light sources according to the light flux of the light source 130 can be changed to be deflected to the right and left, and can be arranged in a one-to-one manner instead of zigzag.

Referring to FIG. 6, the light source unit may include one light source array X1. In this case, the light source array X1 may include a plurality of light sources 130 arranged in a line at predetermined intervals, and the light emitting directions of the light sources 130 included in the light source array X1 may be arranged in the lateral direction of the substrate 110 ≪ / RTI > In addition, the interval between the light sources 130 can be adjusted according to the light flux of the light source 130. In the case where only one light source array X1 is used as described above, it is preferable that the light source is used for a light source or a substrate having a narrow width.

5, the light source unit includes four light source arrays X1, X2, X3, and X4. The light source unit includes a first light source array X1 and a second light source array X2, The light sources 130 of the third light source array X3 and the light sources 130 of the fourth light source array X4 are arranged in a zigzag manner with respect to each other, Do. That is, all of the light exit surfaces of the light sources 130 in Fig. 7 are directed to the side of the substrate 110. Fig. At this time, the interval between the light sources 130 may be adjusted according to the light flux and the directivity angle of the light source 130, and the light exit direction of the light source 130 may be directed in a direction opposite to the light exit direction in FIG. And the light output surface is inclined upward or downward according to the light flux and the directivity angle of the light source 130, thereby changing the light output direction. Although FIG. 7 illustrates a light source unit including an even number of light source arrays, it is apparent to those skilled in the art that the light source unit may include an odd number of light source arrays, as well as the light source unit may include five or more light source arrays something to do.

7, the light source unit is composed of four light source arrays X1, X2, X3, and X4, and the light sources included in the first light source array X1 and the second light source array X2, And the light sources 130 included in the third light source array X3 and the fourth light source array X4 are arranged in a zigzag manner with respect to each other, It is different. 7, the light exit surfaces of the light sources 130 included in the first and third light source arrays X1 and X3 are aligned in the right direction of the substrate 110 with the second and fourth light source arrays X2 and X4, The light emitting surfaces of the light sources 130 included in the substrate 110 are directed to the left side of the substrate 110. [ At this time, the interval between the light sources 130 can be adjusted according to the light flux of the light source 130 and the directivity angle, and the light exit direction of the light source 130 may be directed in a direction opposite to the light exit direction in FIG. And the light output surface may be inclined upward or downward according to the light flux and the directivity angle of the light source 130 to change the light output direction. Although FIG. 8 shows a light source unit including an even number of light source arrays, it is apparent to those skilled in the art that the light source unit may include an odd number of light source arrays, as well as the light source unit may include five or more light source arrays something to do.

9, a light source unit in an amorphous substrate includes a first light source array X1 in which a plurality of light sources 130 are uniformly arranged at a predetermined interval, a second light source array X1 in which a plurality of light sources 130 are irregularly arranged, And the light source array X2. The illumination device according to the present invention can be easily applied to the irregular shape as shown in FIG. 9 by using the resin layer replacing the light guide plate and the flexible printed circuit board. It is possible to maximize the light efficiency by adjusting the arrangement of the light sources included in the first and second light source arrays X1 and X2 according to the light flux and the directivity angle of the light source 130. [

10, the light source unit is composed of the first and second light source arrays X1 and X2, and a plurality of light sources are arranged in a zigzag fashion at the upper and lower ends of the substrate 110. However, The substrate in Fig. 10 is formed with a curved surface. As described above, the present invention can be easily applied to a curved surface having a soft material by the resin layer and the flexible printed circuit board, and the degree of freedom of design can be improved.

As described above, the lighting apparatus according to the present invention can arrange the light sources in various shapes without any structural limitation, and by arranging various light sources utilizing the light flux and the light distribution of the light sources, it is possible to control the hot spot, Thereby maximizing the surface light emission quality.

Fig. 11 shows a structure 100b with a diffusion plate added to the illuminating device of the present invention shown in Fig.

3 and 11, the illumination device 100b of the present invention is formed on the resin layer 150 and includes a diffusion plate 150 for uniformly diffusing light emitted through the resin layer 150, (Not shown), but a prism sheet, a protective sheet, or the like may be further provided on the upper or lower portion of the diffusion plate 290. The diffusion plate 290 may be formed of an acrylic resin, but is not limited thereto. The diffusion plate 290 may be formed of a material such as polystyrene (PS), polymethylmethacrylate (PMMA), cyclic olefin copoly (COC), polyethylene terephthalate ), And high-permeability plastic such as resin.

An air layer (first air gap) 280 may be further formed between the diffusion plate 290 and the resin layer 150 and may be supplied to the diffusion plate 290 due to the presence of the first air gap 280 The uniformity of light can be increased, and as a result, the effect of improving the uniformity of the light diffused and emitted through the diffusion plate 290 can be realized. At this time, in order to minimize the deviation of light transmitted through the resin layer 150, the thickness of the first air gap 280 may be formed in a range of more than 0 mm but not limited thereto, .

Fig. 12 shows a structure 100b in which a reflection pattern is added to the illumination apparatus of the present invention shown in Fig.

Referring to FIGS. 3, 11 and 12, the illumination device 100b of the present invention may further include a reflection pattern 121 formed on the reflection sheet 120. FIG. The reflection pattern 221 serves to scatter light incident on the diffusing plate 290 and to uniformly transmit the light to the diffusing plate 290. The reflection pattern 121 may be formed by printing on the surface of the reflective sheet 120 using reflective ink containing any one of TiO ₂ , CaCo ₃ , BaSo 4, Al ₂ O _{3 ,} Silicon, and Polystyrene But is not limited thereto. In addition, the structure of the reflection pattern 121 may include a plurality of protruding patterns, and may be formed in a prism shape, a lenticular shape, a lens shape, or a combination thereof in order to increase the light scattering effect. It is not. In addition, the cross-sectional shape of the reflection pattern 121 may have a structure having various shapes such as a triangle, a quadrangle, a semicircle, and a sine wave.

Fig. 13 shows a structure 100d in which an optical sheet is added to the illuminating device of the present invention shown in Fig. Hereinafter, it is described that the optical sheet is added to the structure shown in Fig. 12, but this is merely an example, and the optical sheet may be added to the illuminating device shown in Fig. 11, which is a structure without the reflective sheet.

3 and 11 to 13, the illumination device 100d of the present invention is formed between the resin layer 150 and the diffusion plate 290 and includes a first optical sheet (not shown) formed on the resin layer upper surface 150 A second optical sheet 190 formed on the first optical sheet 170 and an adhesive layer 180 formed between the first optical sheet 170 and the second optical sheet 190 And a second air gap 181 may be further formed in the adhesive layer 180. That is, the adhesive layer 180 is formed by forming a space (second air gap) 181 spaced around the optical pattern 183 and applying an adhesive material to the other portion to form the first optical sheet 170 and the second optical sheet 183, (190) to each other. Further, an optical pattern 183 may be further formed on the upper surface of the first optical sheet 170 or on the lower surface of the second optical sheet 190, and one or more additional optical sheets may be additionally formed on the second optical sheet 190 It is also possible to do. The structure including the first optical sheet 170, the second optical sheet 190, the adhesive layer 180 and the optical pattern 183 can be defined as the optical pattern layer A. [

The optical pattern 183 may be formed as a light-shielding pattern formed to prevent the light emitted from the light source unit from being focused. For this purpose, alignment between the optical pattern 183 and the position of the light source 130 is required The first optical sheet 170 and the second optical sheet 190 are adhered to each other by using the adhesive layer 180 for securing the fixing force.

The first optical sheet 170 and the second optical sheet 190 can be formed using a material having a high light transmittance. For example, PET can be used.

The optical pattern 183 disposed between the first optical sheet 170 and the second optical sheet 190 basically functions to prevent the light emitted from the light source 130 from being concentrated. The optical pattern 183 may be formed as a light shielding pattern so that a light shielding effect can be realized to prevent a phenomenon in which the light is excessively strong in strength and the optical characteristics are deteriorated or the yellow light is yellowish. The pattern may be formed by performing a printing process on the upper surface of the first optical sheet 170 or the lower surface of the second optical sheet 190 using light shielding ink.

The optical pattern 183 is not a function to completely block the light, but can be implemented so that the light shielding degree and the diffusing degree of the light can be controlled by one optical pattern so as to perform a function of partial shielding and diffusion of light. Furthermore, more particularly, the optical pattern 183 according to the present invention may be implemented with a superimposed printing structure of a complex pattern. The structure of superimposed printing refers to a structure in which one pattern is formed and another pattern is printed on the pattern.

For example, when the optical pattern 183 is implemented, at least one selected from TiO ₂ , CaCO ₃ , BaSO ₄ , Al ₂ O ₃ , and Silicon is formed on the lower surface of the polymer film (for example, the second optical sheet) A light-shielding pattern formed by using a light-shielding ink including a diffusion pattern formed using a light-shielding ink containing a substance and a mixed material of Al or Al and TiO ₂ . That is, it is also possible to form a diffusion pattern on the surface of a polymer film by white printing, and then form a light-shielding pattern thereon or a double structure in the reverse order. Of course, it will be obvious that the formation design of such a pattern can be variously modified in consideration of light efficiency, intensity, and shading ratio. Alternatively, it is also possible to form a light-shielding pattern, which is a metal pattern, in the middle layer in a sequential laminated structure, and to form a triplet in which a diffusion pattern is formed on the upper and lower portions, respectively. In such a triple structure, it is possible to select and implement the above-mentioned materials. As a preferable example, one of the diffusion patterns is realized by using TiO ₂ having excellent refractive index, and CaCO ₃ excellent in light stability and color is used together with TiO ₂ The light diffusing pattern can be realized and the light efficiency and homogeneity can be ensured through the triple structure which realizes a light shielding pattern by using Al which is excellent in concealment. Particularly, CaCO ₃ functions to reduce the exposure of yellow light and finally realize white light. Thus, it is possible to realize light with more stable efficiency. In addition to CaCO ₃ , particles such as BaSO ₄ , Al ₂ O ₃ , It is also possible to utilize inorganic materials having a large size and a similar structure. In addition, it is preferable that the optical pattern 183 is formed by adjusting the pattern density so that the pattern density becomes lower as the distance from the LED light source emission direction increases.

The adhesive layer 180 has a structure that surrounds the periphery of the optical pattern 183 and forms a second air gap 181 in the other portion or a structure that forms a second air gap 181 in the periphery of the optical pattern 183 So that the two optical sheets can be adhered to each other to form an array. In other words, the adhesive structure of the first optical sheet 170 and the second optical sheet 190 can also realize the function of fixing the printed optical pattern 183.

At this time, the adhesive layer 180 may be a thermosetting PSA, a thermosetting adhesive, or a UV cured PSA type material, but is not limited thereto.

The first air gap 280 described in the description of FIG. 11 may be formed between the second optical sheet 190 and the diffuser plate 170, and the presence of the first air gap 280 may cause diffusion The uniformity of the light supplied to the plate 290 can be increased and consequently the uniformity of the light diffused and emitted through the diffuser plate 290 can be improved. At this time, in order to minimize a deviation of light transmitted through the resin layer 150, the thickness of the first air gap 280 may be formed in a range of 0 to 20 mm, but the present invention is not limited thereto, Is as described above in the description of Fig.

Although not shown in the drawings, it is described above that at least one optical sheet may be additionally formed on the optical pattern layer A as necessary.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that many suitable modifications and variations are possible in light of the present invention. Accordingly, all such modifications and variations as fall within the scope of the present invention should be considered.

110: printed circuit board
120: reflective sheet
121: reflection pattern
130: Light source
150: Resin layer
151: Bead
170: first optical sheet
180: Adhesive layer
181: second air gap
183: Optical pattern
190: second optical sheet
280: first air gap
290: diffusion plate

Claims (18)

Printed circuit board;
A light source unit formed on the printed circuit board;
A resin layer formed on the printed circuit board and embedding the light source unit;
And a reflective sheet formed between the printed circuit board and the resin layer and having a structure penetrated by the light source unit,
Wherein the light source unit includes at least one light source array in which a plurality of light sources are disposed.
The method according to claim 1,
The light source array includes:
Wherein a plurality of light sources are arranged in a line at predetermined intervals.
The method according to claim 1,
The light source unit includes:
Wherein the first light source array and the second light source array are electrically insulated and driven independently.
The method of claim 3,
Wherein an interval between the first light source array and the second light source array is 10 to 30 mm.
The method of claim 3,
Wherein an interval between the light sources included in the first light source array and an interval between the light sources included in the second light source array is 12 to 30 mm.
The method of claim 3,
Wherein the light sources included in the first light source array and the light sources included in the second light source array are arranged in a zigzag manner.
The method of claim 3,
Wherein the light sources included in the first light source array and the light sources included in the second light source array are disposed in a one-to-one correspondence with each other.
The method of claim 3,
Wherein the light sources included in the first and second light source arrays are individually driven.
The method of claim 3,
Wherein one of the first light source array and the second light source array comprises:
Wherein a plurality of light sources are irregularly arranged.
The method of claim 3,
Wherein the light sources included in the first light source array and the light sources included in the second light source array are different from each other in the light output direction.
The method of claim 3,
Wherein the light flux of the light sources included in the first light source array is different from the light flux of the light sources included in the second light source array.
The method according to claim 1,
The light source includes:
A lighting device comprising a side view type light emitting diode.
The method according to claim 1,
And a reflection pattern is formed on the reflection sheet.
The method according to claim 1,
And a diffusion plate is formed on the resin layer.
15. The method of claim 14,
And an air gap is formed between the resin layer and the diffusion plate.
15. The method of claim 14,
And an optical sheet formed between the resin layer and the diffusion plate to disperse the light emitted therefrom.
The method according to claim 1,
Wherein the resin layer comprises:
And further comprising a bead made of any one selected from the group consisting of silicon, silica, glass bubble, PMMA, urethane, Zn, Zr, Al ₂ O ₃ , .
The method according to claim 1,
Wherein the printed circuit board includes:
A lighting device comprising a flexible printed circuit board.

Images