KR20210019042A - Light unit - Google Patents

Abstract

Embodiments disclose a lighting device, which includes: a printed circuit board; a plurality of light sources disposed on the printed circuit board; a reflection unit disposed on the printed circuit board; and a resin layer disposed on the plurality of light sources. The reflection unit includes: a reflection film disposed on the printed circuit board; a film of a transparent material disposed to be spaced apart from the reflection film; and a spacer member disposed between the reflection film and the film of the transparent material. The reflection unit includes a plurality of holes through which each of the plurality of light sources passes.

Description

Lighting device {Light unit}

The present invention relates to a lighting device using an LED as a light source, and further to a backlight unit, a liquid crystal display device, and a vehicle lighting device using the above-described lighting device.

A device that implements lighting by inducing light emitted from a light source is required in various ways in lighting lamps, vehicle lamps, and liquid crystal displays. In such lighting devices, a technology that makes the structure of an equipment thinner and a structure that can increase light efficiency are recognized as the most important technologies.

As an example in which such a lighting device operates, a liquid crystal display device will be described as follows.

Referring to FIG. 1, in this lighting device 1, a flat light guide plate 30 is disposed on a substrate 20, and a plurality of side-type LEDs 10 (only one shown) are arranged in an array form on the side of the light guide plate 30. Is placed as.

The light L incident from the LED 10 to the light guide plate 30 is reflected upwards by a fine reflection pattern or reflective sheet 40 provided on the bottom of the light guide plate 30 and is emitted from the light guide plate 30, and then the light guide plate ( 30) Light is provided to the upper LCD panel 50.

In such a lighting device, as in the conceptual diagram shown in FIG. 2, a plurality of optical devices such as a diffusion sheet 31, a prism sheet 32, 33, and a protective sheet 34 between the light guide plate 30 and the LCD panel 50 It may be formed in a structure to add more sheets.

Therefore, such a light guide plate is basically used as an essential part of such a lighting device, but due to the thickness of the light guide plate itself, it is possible to reduce the overall thickness of the product, showing a limitation. In the case of a large area lighting device, the image quality is deteriorated. Is causing.

The present invention was conceived to solve the above-described problem, and an object of the present invention is to provide a reflective unit that implements an air region patterned with an adhesive material on the surface of a printed circuit board using white PET, thereby improving light reflectance and luminance. Provides a lighting device capable of maximizing light control and reflection efficiency due to the pattern design of the spacer (spacer) forming the air area, which maximizes the improvement, can increase the brightness without increasing the thickness of the lighting device or the number of light sources. Have.

In addition, by removing the light guide plate essential to the structure of the lighting device of the present invention, and forming a structure that induces the light source using a film-type resin layer, the number of light sources can be reduced, and the overall thickness of the lighting device is reduced, It is another object of the present invention to provide a reliable product that can increase the degree of freedom in product design.

A lighting device according to an aspect of the present invention includes a printed circuit board; A plurality of light sources disposed on the printed circuit board; A reflective unit disposed on the printed circuit board; And a resin layer disposed on the plurality of light sources, wherein the reflective unit comprises a reflective film disposed on the printed circuit board, a transparent film disposed spaced apart from the reflective film, and the reflective film and the transparent material And a spacer member disposed between the films of, and the reflective unit includes a plurality of holes through which each of the plurality of light sources passes.

Light emitted from the plurality of light sources may pass through the transparent material film and be reflected by the reflective film.

It may include a plurality of reflective patterns disposed on the transparent material film.

The spacer member may include a plurality of unit spacers and a plurality of first space regions, and the unit spacers may be connected to each other and disposed.

Each of the plurality of unit spacers may include a hexagonal outer peripheral surface in which each of the plurality of first spatial regions is disposed.

Including an optical pattern layer disposed on the resin layer, the optical pattern layer is a first film, a second film disposed on the first film, and a light blocking pattern disposed between the first film and the second film And an adhesive pattern layer.

The light blocking pattern may include a region overlapping each of the plurality of light sources in a direction perpendicular to the printed circuit board.

A lighting device according to another embodiment of the present invention includes a printed circuit board; A plurality of light emitting devices disposed on the printed circuit board; A reflective unit disposed on the printed circuit board; A resin layer disposed on the plurality of light emitting devices; And a light shielding pattern disposed on the resin layer, wherein the reflective unit includes a reflective film disposed on the printed circuit board and a transparent film disposed on the reflective film, and the reflective film and the transparent The material film includes a plurality of holes through each of the plurality of light emitting devices, and the plurality of light emitting devices are light emitting devices emitting light in a lateral direction.

The reflective unit may include a plurality of first spatial regions formed between the reflective film and the transparent material film.

It may include a plurality of reflective patterns disposed on the transparent material film, and disposed in a direction in which light of each of the plurality of light emitting devices is emitted.

The reflective unit includes a plurality of unit spacers and a plurality of first space regions disposed between the reflective film and the transparent material film, and the plurality of first space regions are each other by the plurality of unit spacers. They can be arranged spaced apart.

Each of the plurality of first spatial regions may include a hexagonal horizontal cross section.

A first film disposed below the shading pattern, a second film disposed above the shading pattern, and an adhesive pattern layer disposed on the same horizontal line as the shading pattern may be included.

The light blocking pattern may be formed by printing on a lower surface of the second film as a plurality of unit patterns, and the light blocking pattern may include a region in which the density of the plurality of unit patterns decreases.

The adhesive pattern layer may be disposed to be spaced apart from the light blocking pattern by a second spatial region formed around the light blocking pattern.

According to the present invention, a reflective unit that implements an air area using white polyethylen terephthalate (PET) is provided on the surface of a printed circuit board to improve light reflectance and increase luminance, and the thickness of the lighting device or the number of light sources The luminance can be increased without an increase, and there is an effect of maximizing light control and reflection effect due to the pattern design of the spacer (spacer) forming the air region.

In addition, in the present invention, an optical pattern layer having an optical pattern is formed, but by patterning an adhesive material (adhesive pattern layer) to provide an air region, it is possible to eliminate the occurrence of hot spots and dark portions occurring in the shading pattern portion. In addition, the reliability between the adhesive material and the components to be bonded can be secured, and at the same time, a lighting device without significant difference in optical properties can be implemented, and precise alignment between components is possible.

In addition, by patterning the diffusion plate or using a separate member to provide an air gap module having an air layer, there is an effect of increasing the optical characteristics of diffusion and light uniformity of the lighting device.

In addition, by removing the light guide plate, which is essential to the structure of a general lighting device, and forming a structure that induces the light source using a film-type resin layer, the number of light sources can be reduced, the overall thickness of the lighting device is reduced, and product design There is an effect that can increase the degree of freedom.

In particular, by mounting a side-type light-emitting diode as a direct type, optical characteristics can be secured while significantly reducing the number of light sources, and applicable to the structure of a flexible display by removing the light guide plate, and a reflective film including a reflective pattern in the resin layer. And a diffusion plate including an air layer to ensure stable light-emitting characteristics.

1 and 2 are conceptual diagrams showing the structure of a conventional lighting device.
3 is a conceptual cross-sectional view showing a main part of the lighting device according to the present invention.
FIG. 4 shows an embodiment of a spacer member constituting a reflective unit included in the lighting device according to the present invention described above in FIG. 3.
5 is a result table comparing the efficiency of the reflective unit according to the present invention.
6 is an implementation of another embodiment of the lighting device according to the present invention.
7 is an implementation of another embodiment of the lighting device according to the present invention.
8 and 9 show various embodiments implemented in the optical pattern layer and the diffusion plate according to the present invention, and show specific embodiments of the reflective unit.

Hereinafter, the configuration and operation according to the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same components are assigned the same reference numerals regardless of the reference numerals, and redundant descriptions thereof will be omitted. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

The present invention is to improve reflectance and luminance by arranging a reflective unit that implements a spatial area (air area) including white polyethylen terephthalate (PET) under the LED light source in a lighting device using an LED as a light source. Let it be the point.

In particular, in the case of this lighting device, in the structure of a conventional lighting device, patterning is performed on an optical pattern layer or diffusion plate that implements a spatial region by patterning an adhesive material (adhesive pattern layer), or an air layer is provided using a separate member. The main point is to provide a structure that can reduce the number of light sources while innovatively reducing the overall thickness of the lighting device by providing an air gap module to improve optical characteristics, and in particular, by removing the light guide plate and forming it as a resin layer. To

The lighting device according to the present invention is not limited to being applied as a backlight unit of a liquid crystal display device. That is, of course, it can be applied to various lamp devices that require lighting, such as vehicle lamps, home lighting devices, and industrial lighting devices. Of course, vehicle lamps can be applied to headlights, interior and lighting, and rear lights.

1. First embodiment

3 is a conceptual cross-sectional view showing a main part of the lighting device according to the present invention.

3, the lighting device according to the present invention includes a plurality of LED light sources 130 formed on a printed circuit board 110, the LED light source 130 on the upper surface of the printed circuit board 110 It is configured to include a reflective unit 120 stacked on the printed circuit board 110 in a through structure. In particular, in this case, a space area A1 is provided inside the reflective unit 120. The spatial area A1 may maximize the luminance by improving reflection efficiency of light emitted from the light source 130.

In particular, the reflective unit 120 is spaced apart from the first reflective film 121 and the first reflective film 121 made of white polyethylen terephthalate (PET) in close contact with the surface of the printed circuit board 110. It may be configured to include a second reflective film 122 made of a transparent material forming the spatial area A1. The first and second reflective films 121 and 122 are stacked on the printed circuit board, and the LED light source 130 protrudes to the outside through a hole formed on the reflective film.

In the formation of the spatial area A1, it is possible to form the first and second reflective films 121 and 122 in an integrally compressed structure without using a separate member such as an adhesive. Likewise, the first and second reflective films 121 and 122 may be spaced apart so as to implement a space area A1 in which air is accommodated through a spacer 123 such as a separate adhesive member.

In this case, the first reflective film 121 is a reflective structure that reflects light, and in particular, in the present invention, it is preferable to use white polyethylen terephthalate (PET). In the unique reflective unit according to the present invention, the first reflective film may be implemented as a general metal reflective material layer (Ag, etc.), but white polyethylen terephthalate (PET) may be used in order to maximize the effect of improving luminance. Yes (see Fig. 5). That is, in implementing the reflective unit according to the present invention, when white polyethylen terephthalate (PET) is implemented as the first reflective film, the effect of improving luminance of about 30% compared to the prior art may be realized.

In addition, the second reflective film 122 in the present invention is more preferably a transparent material film so that the light emitted from the LED is transmitted to the surface of the first reflective film 121 and reflected again.

In particular, in addition to the light emitted from the light source 130 transmitted through the second reflective film and re-reflected from the first reflective film, the reflective pattern 124 is formed on the surface of the second reflective film 122 through white printing. It is more preferable to provide it so that the luminance can be improved by further promoting light dispersion. A reflective pattern 124 is provided to significantly improve the reflectance of light. The reflective pattern may be printed using reflective ink containing any one of TiO2, CaCO3, BaSO4, Al2O3, Silicon, and PS.

In particular, in the case of the lighting device according to the present invention, various types of light sources can be applied as the light source, and particularly preferably, a side-emitting type LED may be used. In this case, the reflection pattern is the light output of the LED light source. It is preferable to form in the direction, and in particular, the pattern can be arranged so that the pattern density increases as the distance from the emission direction of the LED light source increases. In the case of implementing an LED having a side-emitting type structure, the advantage of greatly reducing the number of light sources is realized.

4 is a diagram showing an embodiment of a spacer member constituting a reflective unit included in the lighting device according to the present invention described above in FIG. 3.

That is, the spacing member according to the present invention can implement a space area by performing a general spacing function, such as a spacer member that simply separates the first reflective film from the second reflective film or a spacer member having adhesive properties, but is more preferable. In order to improve the efficiency of the arrangement of the spatial region and at the same time to increase the adhesion efficiency, the spacer member may be formed by uniformly or randomly patterning the structure patterned with the structure shown in FIG. 4.

In the spacer member 123 shown in FIG. 4, a plurality of unit spacers 123a in which a cavity part is implemented are disposed, and a first space region in an empty structure inside the unit spacer member 123a ( 123b) can be implemented in a two-dimensional or three-dimensional structure. That is, the cross section of the unit spacer member 123a may be implemented in various shapes such as a polygon, a circle, and an ellipse. In particular, as shown, in addition to the structure in which a plurality of each one unit spacer member 123a is arranged in close contact with each other, the first spatial region 123b inside the unit spacer member 123a and each It is also possible to implement the air unit 123c of an empty space between the unit spacer members 123a.

5 is a result table for comparing the degree of brightness improvement of a lighting device when implementing the structure of the reflective unit according to the present invention. (CIE X and CIE Y are color coordinates.)

The table shown in (A) is a measurement of the luminance when only one reflective film is formed of Ag is formed on the surface of the printed circuit board in the structure of FIG. 3, and (B) is the structure of the reflective unit according to the present invention, That is, when the adhesive pattern material is formed of silicon to form the pattern of FIG. 4, and the first reflective film is an Ag film, the luminance improvement result is measured compared to the conventional structure (A).

In addition, (C), unlike (B), the first reflective film is formed of white PET, and accordingly, compared with the conventional structure (A), the result of luminance improvement is measured.

As a result of the measurement, in the case of (A), the luminance is 6605 nit, and based on this, the luminance improvement result of about 13% is 7468 nit in the structure of (B), and when a reflective unit including the white PET according to the present invention is implemented Phosphorus (C) showed a luminance increase rate of 28.6% compared to (A) at 8472 nit. That is, in the case of using white PET while having a structure (spatial area) in which the adhesive material layer is patterned, it is possible to realize a result of maximizing brightness improvement.

2. Second embodiment

6 is an implementation of another embodiment of the lighting device according to the present invention.

That is, the second embodiment according to the present invention implements a structure in which a resin layer is laminated on the printed circuit board in the above-described first embodiment. The configuration of the resin layer corresponds to a configuration that replaces the light guide plate used in a conventional lighting device, and performs a function of inducing light emitted from a light source to the front.

Referring to FIG. 6, the lighting device according to the present invention further includes a plurality of LED light sources 130 formed on the printed circuit board 110 and a resin layer 140 for inducing diffusion of the emitted light forward. Is composed.

That is, the resin layer 140 is laminated in a structure surrounding the LED light source 130, and functions to disperse the light emitted from the light source in the lateral direction. That is, the function of the conventional light guide plate can be performed in the resin layer 140.

It goes without saying that the resin layer can be used as long as it is a resin of a material capable of diffusing light. As an example, as a main material of the resin layer according to an embodiment of the present invention, a resin containing urethane acrylate oligomer as a main material may be used. For example, a mixture of a synthetic oligomer, urethane acrylate oligomer, and a polyacrylic polymer type may be used. Of course, it may further include a monomer in which a low-boiling-point dilution-type reactive monomer such as IBOA (isobornyl acrylate), HPA (Hydroxylpropyl acrylate, 2-HEA (2-hydroxyethyl acrylate), etc.) may be further included, and as an additive, a photoinitiator (such as 1 -hydroxycyclohexyl phenyl-ketone, etc.) or antioxidants can be mixed.

In addition, the resin layer 140 may include beads 141 to increase diffusion and reflection of light. It is preferable that the bead contains 0.01 to 0.3% of the total resin layer weight. That is, the light emitted from the LED in the lateral direction is diffused and reflected through the resin layer 140 and the bead, so that it can proceed upward.

This, together with the reflective unit 120 according to the present invention described above, can further promote the reflective function. Therefore, the presence of the resin layer can realize a thinner overall product by innovatively reducing the thickness occupied by the conventional light guide plate, as well as having a ductile material, thus providing versatility applicable to flexible displays. You will be able to.

3. Third embodiment

The structure of the lighting device of the third embodiment in which an optical pattern layer for promoting light diffusion on the resin layer is implemented as an improved structure from the structure of the second embodiment described above will be described.

That is, referring to FIG. 7, in the structure described above in FIG. 6, the lighting device according to the present invention includes an optical pattern layer 150 disposed on the resin layer 140 and including the optical pattern 151. It can be implemented in a structure provided.

In particular, the optical pattern layer 150 may include an adhesive pattern layer 153 forming a second spatial region 152 surrounding a peripheral portion of the optical pattern. That is, the adhesive pattern layer 153 is implemented by forming a spaced apart space (second space region) having a pattern of a certain shape on the optical pattern 151, and applying an adhesive material to the other portions and bonding them.

That is, in the arrangement relationship between the optical pattern layer 150 and the adhesive pattern layer 153 in the structure of the drawing, the optical pattern layer 150 includes a first substrate 150A including the optical pattern therein, and A second substrate 150B is provided, and the adhesive pattern layer 153 is applied to a portion other than the second spatial region 152 surrounding the periphery of the light blocking pattern to be applied to the first substrate 150A and the second substrate. (150B) will be bonded.

That is, the optical pattern 151 may be formed as a light-shielding pattern formed to prevent the concentration of light emitted from the LED light source 130, and for this purpose, between the position of the optical pattern 151 and the LED light source 130 Alignment is required, and after alignment, it is adhered using an adhesive member for securing a fixing force.

For the first substrate 150A and the second substrate 150B, a substrate made of a material having excellent light transmittance may be used, and PET may be used as an example. In this case, the optical pattern 151 disposed between the first substrate 150A and the second substrate 150B basically performs a function of preventing the light emitted from the LED light source from being concentrated, and the first substrate ( 150A) or the second substrate 150B can be implemented through light-shielding printing, and the two substrates are bonded with an adhesive layer that applies an adhesive material in a structure surrounding the periphery of the light-shielding pattern to implement alignment. . That is, the bonding structure of the first substrate 150A and the second substrate 150B can simultaneously implement a function of fixing the printed light blocking pattern 151. In addition, the adhesive layer may be made of a thermosetting PSA, a thermosetting adhesive, or a UV-curing PSA type material.

When the adhesive pattern layer 153 is formed and adhered in a pattern structure forming the second spatial region 152 upon adhesion, a strong hot spot or a bright dark area generated by overlapping the adhesive material with the light blocking pattern The occurrence can be prevented, and the uniformity of light can be increased due to the presence of an air layer.

In addition to the above-described configuration, the lighting device according to the present invention may include a diffusion plate 170 on the resin layer 140, and the diffusion plate 170 and the optical pattern layer 150 An air gap module 161 including a third spatial region 160 may be further provided between the two. In addition, a prism sheet, a protective sheet, etc. may be additionally provided on the diffusion plate.

8 conceptually illustrates the configuration of the optical pattern 151, the adhesive pattern layer 153, and the second spatial region 152 formed thereby.

When the adhesive pattern layer 153 is formed by using an adhesive material in a structure surrounding the optical pattern 151 printed in a specific pattern on the first substrate, a predetermined space is formed and the second substrate 150B When) is bonded, this spaced space becomes a closed structure in which an air layer is formed, and this is defined as a'second space area'. The planar shape of the second spatial region 152 formed by the adhesive pattern layer 153 may be implemented in various shapes such as a circle, an oval, a rectangle, a square, and a polygon. In addition, the adhesive pattern layer may be formed using a thermosetting PSA, a thermosetting adhesive, or a UV-curing PSA type material.

In addition, the optical pattern 151 is preferably formed as a light-shielding pattern so that a certain portion of the light-shielding effect can be implemented in order to prevent a phenomenon in which optical properties are deteriorated or yellowish light is emitted due to excessive light intensity. That is, the shading pattern may be printed using shading ink so that light is not concentrated.

The optical pattern may be implemented to control the degree of light blocking or diffusivity with one optical pattern so as to perform a function of partially blocking and diffusing light, not a function of completely blocking light. Furthermore, more preferably, the optical pattern according to the present invention may be implemented as an overlapping printing structure of a complex pattern. The structure of superimposed printing refers to a structure in which one pattern is formed and another pattern shape is printed on the top of the pattern.

As an example, in implementing the optical pattern 151, diffusion formed by using a light-shielding ink containing at least one material selected from TiO2, CaCO3, BaSO4, Al2O3, and Silicon on the lower surface of the polymer film in the light emission direction It can be implemented as a superimposed printing structure of a shading pattern using a shading ink comprising a pattern and a mixture of Al or Al and TiO 2. That is, after forming a diffusion pattern on the surface of the polymer film by white printing, it is also possible to form a light shielding pattern thereon, or to form a double structure in the reverse order. Of course, it is obvious that the pattern formation design can be variously modified in consideration of light efficiency, intensity, and shading rate. Alternatively, in the sequential layer structure, a light shielding pattern, which is a metal pattern, may be formed on the middle layer, and a triple structure may be formed in which diffusion patterns are respectively implemented on the upper and lower portions. In such a triple structure, it is possible to select and implement the above-described materials.As a preferred example, one of the diffusion patterns is implemented using TiO2 having excellent refractive index, and CaCO3 having excellent light stability and color is used together with TiO2 to achieve other diffusion. The efficiency and uniformity of light can be secured through a triple structure of a structure that implements a pattern and implements a light-shielding pattern using Al, which has excellent concealment. In particular, CaCO3 functions to realize white light through the function of subtracting the exposure of yellow light, so that more stable light can be realized.In addition to CaCO3, the particle size of BaSO4, Al2O3, silicon beads, etc. is large, and a similar structure You can also use inorganic materials with. In addition, it is preferable in terms of light efficiency that the optical pattern is formed by controlling the pattern density so that the further away from the emission direction of the LED light source, the pattern density decreases.

In addition, the present invention may further include an air gap module disposed between the optical pattern layer 150 and the diffusion plate 170. FIG. 9 shows an example of forming an air gap module disposed between the optical pattern layer 150 and the diffusion plate 170 shown in FIG. 7.

That is, to the configuration of the lighting device according to the present invention, a structure including an air layer (third spatial region) 160 between the optical pattern layer 150 and the diffusion plate 170 may be added, and the third spatial region Due to the presence of 160, the effect of diffusing the light emitted from the light source and improving the uniformity of the light is realized. In addition, in order to minimize the deviation of the light transmitted through the resin layer 140 and the optical pattern layer 150, the thickness of the third spatial region 160 is preferably formed to 0.01 ~ 2mm.

The third spatial region 160 may be formed by implementing a structure capable of forming an air layer under the diffusion plate, and including a third spatial region implemented through this structure is defined as an “air gap module”. do.

The air gap module includes both a method of forming a spatial region (air layer) by processing the diffusion plate itself, or a configuration of forming a spatial region by forming a separate structure under the diffusion plate. That is, as shown in (a) of FIG. 9, a spacer 171 is formed under the diffusion plate 170 to implement the third spatial region 160, or as shown in (b), the lower portion of the diffusion plate It may be implemented as a structure of the bridge 172 forming a third air area 160 by patterning the layer in close contact with the lower layer.

It is obvious that such an integrated structure can be variously deformed according to the patterned shape, that is, the shape of the pattern forming the spatial region, and thus the shape of the bridge can be variously deformed, and this is also the gist of the present invention. Will be included. Further, as in the structure shown in (c), in addition to the method of patterning the lower surface of the diffusion plate itself, it may be implemented as a structure in which the third spatial region 160 is formed using a separate structure. Of course, the illustrated structure illustrates a structure in which the bridge 174 is formed with a spacer member, but the gist of the present invention includes this method, and various modified embodiments capable of implementing an air layer under the diffusion plate are also of the present invention. I would say it corresponds to the point.

As in the drawing shown in (d), as in the configuration (b) patterning the diffusion plate itself or the configuration (c) using a separate structure, in addition to the single air layer, an independent air layer can be implemented. It is also possible to form the spatial region 160 with a plurality of layers by employing the structures 175 and 176.

The lighting apparatus according to the present invention as described above may implement the arrangement of the light source 130 that emits light L as illustrated in FIG. 5. That is, in order to reduce the number of light sources, the LED light source 130 may be disposed by applying a side-emitting LED.

The lighting device according to the present invention described above can be applied to an LCD through the following configuration and operation. Referring to FIG. 7, light is emitted in the lateral direction from the side-emitting type LED 130, and the emitted light is reflected and diffused in the resin layer 140 formed instead of the structure of the conventional light guide plate, and the optical pattern layer 150 ) To prevent the concentration of light, and to minimize light deviation through the third spatial region formed under the diffusion plate. In particular, due to the presence of the reflective unit 120 according to the present invention disposed between the resin layer 140 and the printed circuit board 110, the reflectance can be further improved, and the effect of maximizing light efficiency and improving luminance Can be implemented. In particular, in the case of the reflective unit 120 according to the present invention, the reflectance can be adjusted by variously changing the design for realizing the spatial area through the patterning of the adhesive material layer, and different according to the material and type of the patterned adhesive material. There is also the effect of adjusting the reflectivity and color realization. Furthermore, it is possible to adjust the reflectance according to the optical characteristics and thickness of the second reflective film 122.

In summary, the light emitted by the reflective unit 120 and the reflective pattern 124 according to the present invention has higher reflective efficiency, so that the light can be guided forward. The light that has passed through the resin layer 140 is diffused or shielded through the optical pattern 151 formed on the optical pattern layer 150, and the purified light is an air gap module formed under the diffusion plate. Through the process, the optical properties are once again refined to increase the uniformity, and white light is incident on the LCD panel through optical sheets such as the prism sheet 180 and DBEF 190 that are added later.

As such, in the case of the lighting device according to the present invention, the reflection efficiency is maximized through a structure having a spatial area of the reflective unit, and the structure of the light guide plate is removed, and a side-emitting type LED is applied as a source of light, and through a resin layer. By inducing light through diffusion and reflection of light, it is possible to reduce the thickness and the number of light sources. On the other hand, it is possible to improve optical characteristics by providing a reflection pattern, a light blocking pattern, and a spatial region of the air gap module to control the problem of luminance deterioration and uniformity due to a decrease in light source.

In the detailed description of the present invention as described above, specific embodiments have been described. However, various modifications may be made without departing from the scope of the present invention. The technical idea of the present invention is limited to the described embodiment of the present invention and should not be defined, and should not be defined by the claims as well as the claims and equivalents.

110: printed circuit board
120: reflection unit
121: first reflective film (White PET)
122: second reflective film
123: separation member
124: reflection pattern
130: light source
140: resin layer
150: optical pattern layer
151: optical pattern
152: second spatial region
153: adhesive layer
160: third spatial region
170: diffuser plate
180: prism sheet
190: DBEF

Claims (1)

Printed circuit board;
A plurality of light sources disposed on the printed circuit board;
A reflective unit disposed on the printed circuit board; And
Including a resin layer disposed on the plurality of light sources,
The reflective unit includes a reflective film disposed on the printed circuit board, a transparent film disposed to be spaced apart from the reflective film, and a spacer disposed between the reflective film and the transparent material film,
The reflective unit includes a plurality of holes through which each of the plurality of light sources passes.

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