KR100987393B1 - Back lighting apparatus of sign board - Google Patents

Abstract

Disclosure of Invention An object of the present invention is to provide a billboard backlighting device using a convenient construction and long-life LED that supports low-power, high-efficiency on-board backlighting for various advertisement display devices.

In the billboard backlighting apparatus of the present invention, an advertisement sheet 31 on which an advertisement text is designed is placed on a billboard frame 30, and a backlighting apparatus for illumination of advertisement contents is provided on the back of the advertisement sheet. Is a surface light source device, the surface light source device is formed by a continuous arrangement of the line light source block, the line light source block is formed on one side of the light guide bar 11 and the longitudinal direction of the light guide bar of the transparent resin material A beam coating unit 12, a metal coating layer 13 coated on the remaining portion except for the beam output unit 12 of the light guide bar to form a light reflection film, and selective at both ends or one end of the light guide bar in the longitudinal direction And a LED holder 14 coupled to one side and provided with an LED power supply terminal on one side, and one or more LEDs 15 mounted in the LED holder to irradiate a beam into the light guide bar. .

LED, light guide bar, metal coating film, backlight, transparent resin material

Description

Back lighting apparatus of sign board

1 is a perspective view of an LED line light source block using a square light guide bar applied to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an enlarged view of a part for explaining another coupling structure between the LED mounted in the LED holder and the end of the light guide bar in the light guide bar applied to the apparatus of the present invention.

4 is an exploded perspective view of the apparatus of the present invention.

[Description of Reference Numerals]

10 main body 11: light guide bar

12 beam output unit 13 metal coating film

14: LED holder 15: LED

16: LED driver 17: uneven portion

18: LED terminal 19: LED mounting groove

30: billboard frame 31: advertising sheet

The present invention relates to a planar backlighting device for various advertisement display devices, and more particularly, to a billboard backlighting device using LEDs, which have a long life of the backlighting device, facilitate the installation of the backlighting device, and obtain low power consumption and high efficiency.

Traditionally, a backlight device for forming a surface light source used in various display devices such as an advertisement signboard or a guide board has used FL (fluorescent lamp) or CCFL (cold cathode fluorescent lamp) as its light source. However, in recent years, with the emergence of high-efficiency, low-power LEDs, LEDs having an extremely long lifetime have been replaced by light sources of various display devices instead of fluorescent lamps as conventional light sources.

A surface light source device as a backlighting means using LEDs is obtained by providing a plurality of LEDs on the side of a light guide plate on a plane so that the LED beam is diffused on the light guide plate.

However, since each LED is a point light source, it is difficult to realize a high quality surface light source because it does not create an even distribution of luminance on the light guide plate.

In order to solve this problem, the application No. 10-2003-0004704 surface light source device uses a LED and a concave shape lens to make a line light source device, and the line light source device to irradiate a beam to the light guide plate to make a surface light source, high efficiency surface light source Propose a technology that can be produced.

Looking at the contents of the prior art in detail, the light emitting diodes are installed at both ends of the light guide pipe which is the light guide so that the point light source by the light emitting diode is converted into the linear light source by the light guide pipe. The beam of the linear light source is irradiated to the front light which is a surface light source device.

At this time, both ends of the light guide pipe are provided with a (concave) lens part for optical alignment so that the beam of the light emitting diode is diffused by the lens part, and a prism is provided opposite the beam output surface of the light guide pipe. In the light emitting diode, the beam of the light emitting diode is reflected and the light guide pipe is wrapped with the reflector so that the light emitting diode beam is output only to the surface light guide plate.

However, the above-mentioned prior art line light source device is provided with a concave lens portion at both ends of the light guide pipe separately, and a reflector for enclosing the light guide pipe must be separately installed, resulting in an increase in assembly workability and product cost.

In particular, the reflector surrounding the light guide pipe makes it difficult to design the assembly structure of the surface light source device, and also makes it difficult to wire the light emitting diodes mounted at both ends of the light guide pipe.

In addition, since the shaving plate of a large area needs to be revealed by using a single line light source device, the large area light source has a low brightness, so that it cannot play a role as a surface light source, and thus it is impossible to produce a large area light source. Have.

The present invention is to solve the above problems, an object of the present invention is to enable a low-power and high-efficiency backlighting for various advertising display devices, to facilitate the construction of the backlighting means for the billboard and to secure a high brightness surface light source It is to provide an advertising billboard backlighting device using the LED.

Another object of the present invention is to provide a billboard backlighting apparatus capable of maintaining a constant high brightness state at all times without being limited to the size of the surface light source.

Another object of the present invention is to provide a billboard backlighting device that can freely control the backlight color for advertising to increase the advertising effect.

In the billboard backlighting apparatus of the present invention for achieving the above object is an advertising sheet is arranged on the billboard frame and the advertising device is installed on the back of the advertising sheet backlighting device for lighting the advertising content, the backlighting The device is a surface light source device, the surface light source device is formed by a continuous arrangement of the line light source block, the line light source block is a light guide bar of the transparent resin material, and a beam output portion formed on one side along the longitudinal direction of the light guide bar And a metal coating film coated on the remaining portion except for the beam output part of the light guide bar to form a light reflection film, and selectively coupled to both ends of the light guide bar or one end of the light guide bar, and having a terminal for supplying LED power to one side. LED holder and one or more LEDs mounted in the LED holder for irradiating a beam into the light guide bar. And that is characterized.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of an LED line light source block using a transparent light guide bar of a square shape applied to the device of the present invention, Figure 2 is a cross-sectional view taken along line A-A of FIG.                     

As referred to herein, the light guide bar 11 using the transparent resin material is formed in a quadrangular bar shape, and the LED holder 14 is disposed at both ends of the light guide bar 11, respectively, the LED holder 14 One or two or more LEDs 15 mounted to the LEDs 15 are configured to be connected to an LED driving voltage of the LED driver 16 which processes an operating voltage or an internally mounted battery voltage applied from the outside.

The LED holder 14 installed at both ends of the light guide bar 11 may be selectively installed at only one end of both ends.

Metal coating films 13 such as Ni and Al are formed on the remaining portions of the transparent resin material except for the beam output unit 12 of the light guide bar 11 to reflect the LED beams. This metal coating film 13 sends out all the beams from the LED provided on the end side of the light guide portion to the beam output portion 12 without loss.

In addition, the concave-convex portion 17 is formed on the opposite side of the beam output portion 12 of the light guide bar 11 prior to the coating of the metal film, so that the diffusion and reflection of the LED beam inside the light guide bar 11 after the metal coding is performed. Wake up all the beam is configured to be focused to the outside only through the beam output unit 12.

These uneven parts may be formed on all surfaces in the longitudinal direction of the light guide bar 11 except for the beam output part 12, and metal coating may be performed on the surface of the LED holder 14, but may be formed at both ends of the light guide bar 11. The side which is abutted and the beam of LED 15 is transmitted is excluded.

In the above description, the light guide bar of the transparent resin material is manufactured in a quadrangular form, but this is the most preferred embodiment. If necessary, the shape of the light guide bar may be manufactured in the form of a triangular bar or a circular bar.                     

On the other hand, the beam output portion 12 provided on the light guide bar of the transparent resin material is made into a translucent state for the secondary scattering of the LED beam diffused in the light guide bar. For this purpose, an etching method or a translucent taping method can be used.

This results in semi-transparency of the beam output 12 on the light guide bar, resulting in glare, even distribution of illumination brightness, and indirect lighting effects.

3 is an enlarged view of a part for explaining another coupling structure between an LED mounted in an LED holder and an end of the light guide bar in the light guide bar applied to the apparatus of the present invention. 11 shows an example in which the LED mounting grooves 19 are provided at both ends or one end in the longitudinal direction, and the head portions of the LEDs 15 protruding from the LED holder 14 are seated in the LED mounting grooves.

The coupling structure of the light guide bar and the LED allows the beam output from the LED 15 to be completely transmitted to the light guide bar without any loss in the connection surface between the light guide bar and the LED holder, thereby minimizing beam loss.

In addition, the LED 15 disposed at the end of the light guide bar is a combination of three types of LEDs of red, blue, and green, and each of the red, blue, and green LEDs is different from each other in the LED driver 16 that supplies driving current thereto. Other current values can be configured to be applied.

This enables color display at the beam output of the light guide bar by adjusting the drive current value of the red, blue, and green LEDs. For example, if all three LEDs, Red, Blue, and Green, are driven simultaneously with the same current value, the beam output of the light guide bar will show a white beam.                     

4 is an exploded perspective view of the apparatus of the present invention.

As referred to herein, the billboard backlighting apparatus of the present invention is arranged on the billboard frame 30, the advertising sheet 31 is designed for advertising text and the back of the advertising sheet to illuminate the advertising content inserted in the advertising sheet It is shown that the backlighting device is installed.

Here, the backlighting device is disposed to form a surface light source by a continuous arrangement of the line light source blocks, and these line light source blocks are light guide bars 11 of the transparent resin material and one surface along the longitudinal direction of the light guide bars as described above. A beam coating unit 12 formed on the second side, a metal coating layer 13 coated on the remaining portion except for the beam output unit 12 of the light guide bar to form a light reflection film, and both ends or one end of the light guide bar in the longitudinal direction. An LED holder 14 selectively coupled to an end and provided with an LED power supply terminal on one side thereof, and one or more LEDs 15 mounted in the LED holder to irradiate a beam into the light guide bar.

Hereinafter, the operation of the present invention will be described.

First, the line light source block by the LED mounting light guide bar 11 is placed on the billboard frame 30, the advertising sheet 31 with the draft text is designed for the on-site backlighting for illuminating the advertising content on the back of the advertising sheet. Are arranged continuously so that each beam output part faces the front side (advertising surface).

Subsequently, when the LED driving voltage generated from the LED driver 16 is passed to the LED 15 mounted in the LED holder 14 of each line light source block, the beams of the LED are each of the transparent resin material forming each line light source block. The light is transmitted to the light guide bar 11 and diffused, and the LED beam is reflected from the metal coating film 13 coated on the outside of the light guide bar and output to each beam output unit 12.

At this time, since the scattering and diffusion of the beam occurs in the uneven portion 17 provided on the opposite side of the beam output portion of the light guide bar or on all surfaces except the beam output portion, the beam is emitted through the beam output portion 12 so that the beam has an even distribution. Have.

Therefore, a high brightness surface light source having an even distribution is formed by the combination of the LED beams output from the beam output surface of the light guide bar constituting each line light source block to brightly illuminate the advertising sheet 31.

In particular, when a plurality of line light source blocks are arranged in series to form a surface light source, a beam output surface formed on one side of the light guide bar of the transparent resin material in the longitudinal direction of the light guide bar is used to prevent a decrease in luminance at the boundary between adjacent line light source blocks. It may be formed by extending some of the adjacent surfaces. In other words, the reflective metal coating layer may be limited so that the beam output surface to be formed on one light guide bar includes a part of the adjacent surface.

As a result, when a plurality of light guide bars constituting the line light source block are continuously arranged, the luminance decrease in the vicinity of the boundary between adjacent line light source blocks is prevented.

On the other hand, the LED 15 disposed at the end of the light guide bar is three kinds of LEDs of red, blue, and green, and different currents for each red, blue, and green LEDs in the LED driver 16 supplying driving current thereto. When the value is adjusted and output, a specific color is displayed at the beam output portion of the light guide bar in proportion to the combination of the current values.

For example, if all three LEDs are driven with the same current at the same time, the beam output of the light guide bar will show a white beam.

Therefore, it is possible to implement various advertising surface color backlights by setting the LED driving program for backlight control of the billboard.

As described above, the present invention enables the production of low power and high efficiency backlighting flat light sources for various display devices using LEDs, and provides the convenience of construction and high brightness surface light source of the backlighting device for billboards. Bring it.

In addition, the present invention is not limited to the size of the surface light source can always maintain a high brightness state of a constant value, it is also possible to freely control the advertising backlight color will also appear an effect that can increase the advertising effect.

Claims (2)

delete In a billboard apparatus having an advertisement sheet designed on the billboard frame 30 and a backlighting apparatus for illuminating advertisement contents is provided on the back of the advertisement sheet, the backlighting apparatus is a surface light source device. The surface light source device is formed by the continuous arrangement of the line light source block, the line light source block is a light guide bar 11 of the transparent resin material, the beam output unit 12 is formed on one side along the longitudinal direction of the light guide bar; A metal coating layer 13 coated on the remaining portion except for the beam output part 12 of the light guide bar to form a light reflection film, and selectively coupled to both ends of the light guide bar or one end of the light guide bar in a longitudinal direction; LED holder 14 is provided with a power supply terminal, and the light is characterized in that it is mounted in the LED holder is composed of a combination of red, blue, green LED 15 for the display of the color beam through the light guide bar Plate back lighting device.

Images