KR100908030B1 - Flexible Thin LED Lighting Panel - Google Patents

Abstract

Disclosed is a flexible thin LED lighting panel that is thin, light and high in light efficiency. The biggest feature of the present invention is to mount a plurality of LED chips corresponding to the light source in the LED lighting panel on a flexible printed circuit board and molding a resin optical system corresponding to each of them 1: 1, and also the overall structure of the flexible material To make. According to the present invention, it is possible to implement a thin, light and high-power thin LED lighting panel and to configure various types of lighting by assembling the plurality of panels, thereby improving product quality and productivity in the field of lighting and display as well as You can expect design flexibility.

Description

Flexible thin LED lighting panel {Flexible thin LED lighting panel}

The present invention relates to an LED lighting panel, and more particularly, to a flexible thin LED lighting panel having a thin, light and high light efficiency.

LED, which converts an electrical signal into light using characteristics of a compound semiconductor, has a long life, low driving voltage, and low power consumption compared to other light emitters. In addition, LED has the advantage of not only excellent response speed and impact resistance, but also small size and light weight. Therefore, the LED is not only used as a light source of a portable electronic device such as a mobile phone, but also widely used as a backlight unit (BLU) and a light source of illumination of a liquid crystal display (LCD).

However, the existing large-scale LED backlight unit uses an LED light source and an optical diffuser in the form of an array in which a plurality of LEDs are mounted on a substrate. On the other hand, the small and medium sized LED backlight unit can realize high light efficiency and thin unit by coupling light to the light guide plate through the side of the light guide plate in the light metering type.However, in large area, due to the limitation of LED light source arrangement and light absorption of the light guide plate, Rather, it shows lower light efficiency than the direct type. In addition, LED flat panel lighting, which is recently attracting attention as indoor lighting, has the same disadvantage as the above-described photometric structure. Therefore, the LED lighting apparatus of the future requires a new concept structure that can take advantage of the above-described LED backlight units only.

On the other hand, in Korean Patent No. 81061, a plurality of high brightness LEDs are arranged in a matrix connected in series or in parallel, and a plurality of high transparency optical acrylic injection lenses having a 1: 1 curvature and corresponding curvatures in front of the LEDs are installed. It is attached to the lens plate to have a constant and improved illuminance, and the LEDs arranged on the edge side among the LEDs are installed away from the center of each lens corresponding to the front and located inward from the center of the lens, thereby improving the light distribution angle of the illumination. Proposes a lighting fixture using. However, in this structure, the lens, which is an optical system for focusing the light emitted from the LED, is formed in the form of one lens plate, and the lens plate is fixed separately from the LEDs, so that it is difficult to reduce the thickness of the LED lighting panel as a whole and the assembly cost is high. There is a problem. In addition, there is a problem that it is difficult to easily respond to a variety of installation environment because it does not give flexibility to the LED luminaire itself.

Accordingly, the problem to be solved by the present invention is to provide a flexible thin LED lighting panel that is thin, light and high in light efficiency.

Another object of the present invention is to provide a flexible thin LED lighting panel that can easily cope with various installation environments.

The flexible thin LED lighting panel of the present invention for solving the above technical problem:

A printed circuit board made of a flexible material and having a circuit pattern formed thereon;

A plurality of LED chips mounted in the form of a two-dimensional array on the printed circuit board;

A plurality of resin optical systems for molding each of them in a 1: 1 correspondence with the LED chips to form a shape of light emitted from each of the LED chips;

A rear reflector of a flexible material having a through hole at a position corresponding to each of the LED chips and the resin optical systems, and installed on the printed circuit board;

A light diffusion plate made of a flexible material having a coupling hole at a position corresponding to the through hole to efficiently couple the light from the optical systems to the body, and positioned above the rear reflector;

It characterized by having a.

The light diffusion plate may further include a light sheet made of a flexible material positioned on the light diffusion plate to uniformly radiate the light passing through the light diffusion plate to the outside. In particular, when a plurality of light diffusion plates are connected, It is possible to reduce the shadows generated at the contact point and to improve the uniformity of the overall light output.

In addition, each of the resin optical system is preferably made of any one selected from the group consisting of silicone resin, epoxy resin, urethane resin and mixtures thereof.

The plurality of LED chips may be arranged in a mesh form in the printed circuit board.

On the other hand, in order to configure a flexible thin LED lighting panel of a larger area, after connecting a plurality of the thin LED lighting panel as a unit, it is possible to attach a light sheet of a flexible material that can cover all of the lighting panel. have. In this case, a hologram or a diffraction pattern may be formed on the resin optical system in order to reduce dark areas generated at the contact surfaces or the contacts of the plurality of lighting panels on the surface of the optical sheet.

According to the present invention, it is possible to implement a flexible thin LED light panel with a thin, light and high light efficiency, it is possible to expect the flexibility of product design as well as the product quality and productivity in the field of lighting and display.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited to these examples.

1 is a view for explaining the structure of a flexible thin LED lighting panel according to an embodiment of the present invention, more specifically, Figure 1 (a) is an exploded perspective view, Figure 1 (b) is a cross-sectional view thereof. Referring to FIG. 1, in the flexible thin LED lighting panel 100, a plurality of LED chips 11 corresponding to a light source and a resin optical system 124 molding each of them are flexible materials having a circuit pattern (not shown), For example, the flexible printed circuit board 110 made of polyimide is arranged in a mesh-shaped two-dimensional array. Here, the external structure (not shown) of the resin optical system 124 covering the LED chip 122 is shown as a hemisphere in FIG. 1, but is not limited thereto, and shapes of light output from the LED chip 122 may be provided. Depending on how to make the resin optical system 124 can be made in many different forms. For example, the resin optical system 124 may be made to have a rectangular parallelepiped, cylinder, or upward convex shape in addition to the hemispherical shape. In addition, various shapes (not shown) such as holograms or diffraction patterns may be imprinted on the surface of the optical system. The light emitted through the resin optical system 124 enters the light diffusion plate 140 or passes through the rear reflector 130 of a flexible material installed on the printed circuit board 110. The rear reflector 130 serves to prevent the light exiting through the resin optical system 124 from going back to the printed circuit board 110 after passing through the light diffusion plate 140, which is also a printed circuit board. Like 110, it is made of a flexible material, for example, aluminum, PET, stainless steel, etc. may be used as the material. The light passing through the through hole 132 of the rear reflector 130 has a coupling hole 142 at a position corresponding to the through hole 132 to be coupled to the outside, and is located above the rear reflector 130. The light diffusion plate 140 of the flexible material to pass through. Coupling hole 142 made in the light diffusion plate 140 is shown as a hollow cylinder blocked, but is not limited to this, the radiation form of the light emitted from the resin optical system 124, and how the light diffuser plate 140 Depending on whether or not to combine with the can be made into a number of different shapes with the top blocked. Most of the upper surface structure of the coupling hole serves to effectively couple the light to the body of the light diffusion plate 140 in the form of a convex lens or a cone. On the light diffusion plate 140, a light sheet 150 of a flexible material for uniformly radiating light to the outside is installed. As will be described later, in particular, when a plurality of flexible thin LED lighting panels are connected to constitute a large area lighting device, if there is no such light sheet 150, darkening occurs at the contact surfaces and the contacts of the panel, thereby making the illumination uneven. In addition, a heat spreader 160 for dissipating heat generated from the LED chip to the outside of the printed circuit board 110 is attached by the pressure-sensitive adhesive 105, which is also made of a flexible material such as an aluminum sheet. Is made. In addition, the light diffusion plate 140 and the light sheet 150 are both made of a flexible material, it is preferable to use a polyolefin resin, PET, polycarbonate sheet and the like. In the flexible thin LED lighting panel 100 having such a structure, the plurality of LED chips 122 are mounted on the printed circuit board 110 in the form of a mesh in a two-dimensional array, and the LED chips 122 have one: 1 The LED light source unit is made of a plurality of resin optical systems 124 serving as lenses to mold each of them correspondingly to form a shape of light emitted from each of the LED chips 122, thereby making a thin and light LED lighting panel. Can be implemented. In addition, the printed circuit board 110, the rear reflector 130, the light diffusion plate 140, the light sheet 150 and the heat sink 160 are all made of a flexible material, it can easily cope with various installation environments.

2 is a cross-sectional view of one LED chip 122 and a resin optical system 124 on a printed circuit board 110 in a thin LED lighting panel according to an embodiment of the present invention. Referring to FIG. 2, it can be seen that there is a resin optical system 124 that molds correspondingly to each of the plurality of LED chips 122 arranged on the printed circuit board 110. Since the resin optical system 124 serves to make the shape of the light emitted from the LED chip 122, it should be made of a transparent material, but the material is not particularly limited as long as the resin optical system 124 performs the function thereof. , Urethane-based resins and mixtures thereof may be made of any one selected from the group consisting of materials. The resin optical system 124 may have a rectangular parallelepiped or a cylindrical shape, or a hemispherical or convex shape. In the case of a refractive optical system (lens), the resin optical system 124 has a convex shape or a hemispherical shape, and as the convex upwards, the orientation angle becomes narrower. Therefore, the radius of curvature may be adjusted. In addition, in this case, the probability that the light emitted from the resin optical system 124 to the outside is incident on the interface between the resin optical system 124 and the outside becomes smaller than the critical angle, thereby reducing the total reflection. As a result, the light extraction efficiency is increased. In the case of a diffractive optical system, the resin optical system 124 may imprint a diffraction or hologram pattern on a surface thereof to form a desired optical shape in the same shape as a rectangular parallelepiped, a cylinder, or the refractive optical system. Meanwhile, the pattern of the resin optical system 124 may be formed by various methods such as hot embossing, etching, compression molding, and UV molding. However, the resin optical system 124 may be formed on the flexible printed circuit board 110 together with the mounting of the LED chip 122. By employing compression molding or a UV molding method in which the resin optical system 124 can be laminated, mass productivity of the LED light source unit can be improved.

3 is a view for explaining a case of implementing a LED lighting panel of a larger area by using a plurality of thin LED lighting panel according to an embodiment of the present invention. Referring to FIG. 3, after the light sheet is removed from the thin LED lighting panel illustrated in FIG. 1 as a unit, and 2 × 2 of them are connected to each other, the light emitted from each unit thin LED lighting panel is connected. It can be seen that when the flexible sheet of light 150 ', which is uniformly radiated to the outside, is made to be attached to a large area to cover all of the unit thin LED lighting panels, a thinner LED lighting panel having a larger area can be realized. Can be.

1 is a view for explaining the structure of a flexible thin LED lighting panel according to an embodiment of the present invention;

2 is a cross-sectional view of one LED chip and a resin molding on a printed circuit board in a flexible thin LED lighting panel according to an embodiment of the present invention; And

3 is a view for explaining a case of implementing a LED lighting panel of a larger area by using a plurality of flexible thin LED lighting panel according to an embodiment of the present invention.

Explanation of reference numerals for main parts of the drawings

100: flexible thin LED lighting panel

110: flexible printed circuit board

122: LED chip

124: resin optical system

130: rear reflector

132: through hole

140: light diffusion plate

142: coupling hole

150: light sheet

160: heat sink

Claims (9)

A printed circuit board made of a flexible material and having a circuit pattern formed thereon, a plurality of LED chips mounted in a two-dimensional array form on the printed circuit board, and molding each of them in a one-to-one correspondence with the LED chips. A plurality of resin optical systems for forming a shape of light emitted from each of the chips, a rear reflector of a flexible material installed on the printed circuit board and having a through hole at a position corresponding to each of the LED chips and the resin optical systems, and the optical system LED lighting panel unit having a coupling hole in a position corresponding to the through hole in order to efficiently combine the light emitted to the body and is provided with a light diffusion plate of a flexible material located on the upper side of the rear reflector, After connecting a plurality of, the light sheet of a flexible material for uniformly radiating the light emitted from each of the LED lighting panel unit to the large area to cover the LED lighting panel unit, characterized in that attached to Flexible thin LED light panel. The flexible thin LED lighting panel of claim 1, wherein the light sheet is disposed on each of the light diffusion plates, and is made of a flexible material that uniformly radiates the light passing through the light diffusion plates to the outside. The flexible thin LED lighting panel of claim 2, wherein the resin optical systems corresponding to the plurality of LED chips 1: 1 are molded on a flexible printed circuit board such as the LED chips. The flexible thin LED lighting panel according to claim 2, wherein the coupling hole of the light diffusion plate is in the form of a hollow cylinder, and an upper surface thereof is blocked. The flexible thin LED lighting panel according to claim 2, wherein the resin optical system has a rectangular parallelepiped, a cylinder, an upwardly convex shape, or a hemispherical shape. The flexible thin LED lighting panel according to claim 5, wherein a diffraction or hologram pattern is imprinted on the surface of the resin optical system to create a desired optical shape. The flexible thin LED lighting panel according to claim 2, wherein the flexible printed circuit board is made of polyimide. The flexible thin LED lighting panel according to claim 2, wherein the light diffusion plate and the light sheet are made of any one material selected from the group consisting of polyolefin resin, PET, and polycarbonate. delete

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