KR101185523B1 - Led flat lighting with an unified guideplate - Google Patents

Abstract

PURPOSE: An LED flat lighting device including an integrated light guide plate is provided to efficiently scatter light by printing a reflection print dot and a diffusion print dot on the light guide plate. CONSTITUTION: A reflection print dot(210) is more densely printed away from an LED module. A diffusion print dot(240) is densely printed with a dot of a preset diameter. Transparent ink(220) covers a space between the reflection print dots in the rear of the light guide plate and covers the diffusion print dot in the front of the light guide plate. A reflection print surface(230) is printed on the reflection print dot and the rear of the transparent ink to reflect light.

Description

LED flat lighting device with integrated light guide plate {LED flat lighting with an unified guideplate}

The present invention relates to an LED flat panel lighting apparatus, and in particular, an integrated type to form a reflective plate and a diffuser plate integrally by printing a reflective printing plate and a diffusion printing dot on the upper and lower surfaces by an inkjet method on a light guide plate required for constituting the LED flat panel lighting device. It relates to an LED flat panel lighting device provided with a light guide plate.

LEDs have been developed for many years and have been widely used in a variety of optical applications. LEDs are lightweight, consume less energy, have a good power-to-light conversion efficiency, and have therefore been used to replace conventional light sources such as incandescent and fluorescent light sources. In the case of using an LED element as an illumination lamp, since the luminous flux per one is weak, a large amount of light is secured by using an LED module in the form of an array package in which many LED elements are mounted in one package.

Planar lighting device using LED light source is classified into direct type or edge type according to the position or arrangement of light source. Especially, it is an edge that puts the light source on the side as one of the green technologies for power saving. Type planar lighting devices are widely used. In this case, the edge type planar lighting device uses a light guide plate to mount an LED light source to the side, and then irradiates light into the light guide plate to emit light through total reflection of the irradiated light.

As shown in FIGS. 1 and 2, in the conventional LED flat panel lighting device 10, a light guide plate 20 having a flat plate shape is disposed on a substrate 12, and a plurality of side type LEDs are provided on the side of the light guide plate 20. 30 are arranged in the form of an array. Light incident from the LED 30 into the light guide plate 20 is reflected downward by the reflecting plate 50 provided on the light guide plate 20 and diffused by the diffuser plate 40 under the light guide plate 20 to the user. To provide a backlight. However, the edge where the LED 30 is located shows high brightness, but the central part far from the lamp becomes dark.

In order to improve this, conventionally, a light guide plate engraved with a pattern (V-cut) 25 appropriately adjusted in size and density so as to be uniformly radiated to the front part is attached, but it is difficult to expect high brightness, and unlike the LCD display, high illumination characteristics In the field of lighting that demands demand, it is difficult to expand the market continuously.

In addition, silk-screen, V-cut, stamping, injection, and laser methods are used to improve the light guide plate. However, each manufacturing method has a productivity problem, a heat generation problem, a thin light guide plate processing problem, and a large area warping problem. With the rise of such lamps, an inkjet method has been proposed that improves these problems and exhibits high illuminance characteristics required only for illumination, unlike backlights for LCD displays. Lenses formed by the inkjet method can be expected to exhibit excellent illumination characteristics due to the convex lens effect that collects light as compared to the dot pattern formed by the silkscreen method.

Patent Application No. 10-2011-0025647 discloses a technique for manufacturing a light guide plate in which a hemispherical lens pattern is formed.

The patent document discloses a light guide plate on which a hemispherical lens pattern is printed on a surface by an inkjet method, and a method of manufacturing the light guide plate. However, the reflective sheet and the diffusion sheet must be separately provided, thereby increasing assembly time and increasing manufacturing cost.

Therefore, the present invention has been invented in view of the above-mentioned problems, and its object is to print a reflective printing dot and a diffusion printing dot on the back surface of the light guide plate by an inkjet method, and to print a diffusion printing dot on the front surface, simplifying the process and processing time of the pattern. LED flat panel lighting device with integrated light guide plate that can reduce the manufacturing cost by not only improving the productivity by shortening the efficiency, but also expressing the high illuminance characteristics required by the LED flat panel lighting device without having the diffuser plate and the reflecting plate. The purpose is to provide.

The present invention for achieving the above technical problem is a light guide plate, a top cover and an LED flat panel lighting device comprising an LED module for irradiating light to the light guide plate, the dot of a predetermined diameter using an epoxy resin ink on the back of the light guide plate A plurality of reflective printing dots which are densely printed in a form, and are densely printed as the distance from the LED module increases; A plurality of diffusion printing dots which are densely printed in a dot shape having a predetermined diameter by using an acrylic resin ink on the front surface of the light guide plate; A transparent ink of a transparent material printed to cover the gap between the reflective printing dots on the rear surface of the light guide plate and the diffusion printing dots on the front surface of the light guide plate; A reflective printing surface which is printed on a rear surface of the reflective printing dot and the transparent ink to reflect a light source; And a control unit.

In addition, the reflective printed dot is characterized in that the diameter is 0.1mm or more and 3mm or less in consideration of the roughness characteristics, the thickness is 0.02mm or more and 0.5mm or less.

In addition, the diffusion printing dot is characterized in that the diameter of 0.02mm or more and 2mm or less, the thickness is 0.05mm or more and 0.5mm or less.

The top cover may further include a converter accommodating part having a space corresponding to the size of the LED converter for supplying power to the LED module and a wire part having a space formed so that the electric wire is located at each corner in the converter accommodating part. It is characterized by.

In addition, the light guide plate is screwed together with the substrate or the top cover is characterized in that it is provided with a screw hole 250 formed through one side to be firmly coupled.

According to the LED flat panel lighting device provided with the integrated light guide plate of the present invention, the reflective light guide plate and the diffused print dot are integrally printed on the light guide plate so that the light source can be efficiently provided without the need for a conventional reflector plate or a diffuser plate with high optical loss. Since it can be scattered, it is possible to expect a reduction in manufacturing cost and a shortening of processing time.

1 is a perspective view of a conventional LED flat panel lighting apparatus, Figure 1 (a) is a perspective view of the LED flat panel lighting device viewed from the bottom, Figure 2 (b) is a cross-sectional view AA of Figure 1 (a).
FIG. 2 is a sectional view taken along line BB of the LED flat panel lighting apparatus shown in FIG.
3 is a configuration diagram of a LED flat panel lighting device having a light guide plate of the present invention
4 is a block diagram showing the flow of the light source in the light guide plate of the present invention
Figure 5 is a perspective view of the top cover of the present invention
6 is a configuration diagram of a LED flat panel lighting device having a light guide plate formed with a screw hole of the present invention

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. In addition, detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention are omitted.

First, as shown in FIG. 3, the present invention includes a light guide plate 200 and an LED module 300 positioned on one side of the light guide plate 200 and including a plurality of LED elements in an array form to irradiate light to the light guide plate 200. In the LED flat panel lighting device comprising a top cover 100 to protect the lighting device on the back, the LED light guide plate 200 is printed with a plurality of reflective printing dots 210 in the form of dots on the back of the LED module It transmits the light source coming from the 300 in a direction away from the LED module 300.

The diameter of the reflective printing dot 210 is provided in 0.1mm or more and 3mm or less in consideration of the roughness characteristics, the thickness is composed of 0.02mm or more and 0.5mm or less. In this case, when the thickness is 0.02 mm or less, the light source cannot be efficiently transmitted to the inside, and the light becomes farther from the LED module 300. When the thickness is 0.5 mm or more, the printing processing time is long. .

The reflective printing dot 210 is preferably made of a material of the epoxy resin ink.

In addition, the reflective printing dot 210 is densely printed in a direction away from the side where the LED module 300 is located to prevent the phenomenon that the illumination of the central portion is lowered.

The transparent ink 220 is printed at intervals between the reflective printing dots 210 printed on the light guide plate 200. The transparent ink 220 is preferably composed of a transparent material that is a transparent epoxy ink.

In this case, the thickness of the transparent ink 220 is the same as the thickness of the reflective printing dot 210 so that the surface of the back surface of the light guide plate 200 can be smoothly constant.

In addition, in order to replace the function of the reflective plate 50 provided in the conventional LED flat panel lighting device, the reflective printed surface 230 is disposed on the rear surface of the light guide plate 200 on which the reflective printing dot 210 and the transparent ink 220 are printed. By printing, the reflective printing dot 210 and the transparent ink 220 are maintained in the light guide plate 200 without being peeled off. In this case, the reflective printing surface 230 may be any type of material capable of inducing a conventional reflection, and may be in the form of a film or an extrusion sheet, and is not limited thereto.

In addition, the diffusion printing dot 240 is printed on the front surface of the light guide plate 200 to replace the function of the diffusion plate 40 provided in the conventional LED flat panel lighting device. Therefore, the light source is scattered and transmitted by the diffusion printing dot 240 and exits to the outside of the light guide plate 200, and has a wide viewing angle with respect to the traveling direction of the light source.

In addition, the diffusion printing dot 240 is located in front of the light guide plate 200 to replace the function of the conventional diffuser plate 40, which serves to scatter the light source to have a wider viewing angle, optically lossy diffusion Even if the plate 40 is not provided, the light source can be scattered efficiently.

The diameter of the diffusion printing dot 240 is provided in 0.02mm or more and 2mm or less in consideration of roughness characteristics, the thickness is 0.05mm or more and 0.5mm or less. In this case, when the thickness is 0.05 mm or less, the uniformity of the light source distribution emitted to the front of the light guide plate 200 may not be maintained, and when the thickness is 0.5 mm or more, printing processing time may be long.

The diffusion printing dot 240 is preferably made of a material of acrylic resin ink.

In addition, in one embodiment, the transparent ink 220 so that the diffusion printing dot 240 is covered on the front surface of the diffusion printing dot 240 to increase the adhesion of the diffusion printing dot 240 printed on the light guide plate 200. ) Can be printed.

Therefore, as shown in FIG. 4, the light source emitted from the LED module 300 passes through the light guide plate 200 and is reflected from the reflective printed surface 230 printed on the rear surface of the diffusion printed dot 240. Scattered at a wide viewing angle and exits to the outside of the light guide plate 200. Therefore, the light source can be scattered efficiently without providing a conventional reflector 50 or a diffuser plate 40 having a large optical loss on one side of the light guide plate 200, thereby reducing manufacturing cost and shortening processing time. It can be expected to have industrial applicability.

In addition, the light source emitted from the LED module 300 is reflected from the reflection printing dot 210 printed on the rear surface passing through the light guide plate 200 and the other reflection printed at a tight interval in the direction away from the LED module 300 Illumination may be uniformly maintained on the front surface by transmitting a light source to the printing dot 210.

In addition, as shown in FIG. 5, the upper cover 100 has a converter accommodating part 110 formed at a central rear surface corresponding to the size of the LED converter for supplying power to the LED module 300. In the receiving portion 110, the wire portion 120 is located inside the wires are formed so that the wires can be connected to the LED module 300 in the direction of each corner, to prevent malfunction due to animals or dust from the ceiling Can be.

In addition, as shown in FIG. 6, the light guide plate 200 is screwed together with the substrate 12 or the top cover 100 so that a screw hole 250 is formed on one side so as to be firmly coupled thereto. Can increase durability.

The embodiment of the LED flat panel lighting device equipped with the integrated light guide plate of the present invention described above is merely exemplary, and those skilled in the art to which the present invention pertains various modifications and other equivalent embodiments therefrom. You can see that it is possible. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: conventional LED flat lighting device 12: substrate
20,200: LGP 25: V-cut pattern
30: LED 40: diffuser plate
50: reflector 100: top cover
110: converter accommodating part 120: electric wire part
210: reflective printing dot 220: transparent ink
230: reflective printing surface 240: diffusion printing dot
250: screw hole 300: LED module

Claims (5)

In the LED flat panel lighting apparatus including a light guide plate 200, the top cover 100 and the LED module 300 for irradiating light to the light guide plate 200,
A plurality of reflective printing dots 210 which are densely printed in a dot shape having a predetermined diameter by using an epoxy resin ink on the rear surface of the light guide plate 200, and are densely printed as the distance from the LED module increases;
A plurality of diffusion printing dots 240 that are densely printed in a dot shape having a predetermined diameter by using an acrylic resin ink on the front surface of the light guide plate 200;
A transparent ink 220 of a transparent material printed to cover the gap between the reflective printing dot 210 on the rear surface of the light guide plate 200 and the diffusion printing dot 240 on the front surface of the light guide plate 200;
A reflective printing surface 230 printed on a rear surface of the reflective printing dot 210 and the transparent ink 220 to reflect a light source;
LED flat panel lighting device having an integrated light guide plate, characterized in that comprises a; The method of claim 1,
The reflective printing dot 210,
LED flat lighting device with an integrated light guide plate, characterized in that the diameter is 0.1mm or more and 3mm or less, and the thickness is 0.02mm or more and 0.5mm or less in consideration of illuminance characteristics, The method of claim 1,
The diffusion printing dot 240,
LED flat panel lighting device with an integrated light guide plate, characterized in that the diameter is 0.02mm or more and 2mm or less, the thickness is 0.05mm or more and 0.5mm or less, 4. The method according to claim 2 or 3,
The top cover 100,
The space is formed so that the wire is located at each corner in the converter receiving portion 110 and the converter receiving portion 110, the space is formed in accordance with the size of the LED converter for supplying power to the LED module 300 on the back LED flat panel lighting device having an integrated light guide plate, characterized in that further comprises a wire portion 120, The method of claim 4, wherein
The light guide plate 200,
LED flat panel lighting device provided with an integrated light guide plate, characterized in that the screw hole (250) is formed through the one side so as to be screwed together with the substrate (12) or the top cover (100).

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