JPH0617171Y2 - Outdoor LED display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is a dot matrix type L used outdoors.
The present invention relates to improvement of an ED display device.

<Prior Art> FIG. 7 shows a partial sectional structure of an outdoor LED display device, and FIG. 8 shows a partial front structure thereof. In the figure, 11 is an LED lamp, 12 is a dot plate,
13 is a packing, 14 is a printed wiring board, and 15 is a frame.

In the LED lamp 11, an LED chip (not shown) is molded inside a lens portion 18 made of a substantially columnar light-transmissive resin with a front surface 17 having a hemispherical shape, and leads 19 connected to the LED chip are provided on the printed wiring board 14. It is connected to the circuit pattern. A large number of the LED lamps 11 are arranged side by side on the edge of the printed wiring board 14. A large number of printed wiring boards 14 are arranged inside a frame body 15 in a direction in which the LED lamps 11 face the front surface. Therefore, a large number of LED lamps 11 are arranged in a matrix on the front surface of the frame body 15.

The dot plate 12 has a large number of openings 12a at positions corresponding to the arrangement positions of the large number of LED lamps 11. The LED lamps 11 arranged in a matrix are individually fitted into the openings 12a of the dot plate 12. There is.

The dot plate 12 is provided for the purpose of improving the contrast between the brightness of the LED lamp 11 and the surrounding brightness.
Since the individual LED lamps 11 are arranged deep inside the openings 12 a of the dot plate 12, the dot plate 12 serves as a hood for the LED lamp 11. That is, the LED lamp 11 is prevented from being directly exposed to sunlight, and the display is difficult to see due to irregular reflection of sunlight at the lens top of the LED lamp 11. The dot plate 12 is subjected to a black matte surface treatment in order to prevent reflection of sunlight.

<Problems to be solved by the invention> Usually, outdoor LED display devices are often used for applications such as a rooftop advertising tower and a road information display board, but since the advertising tower is installed at a high position, A wide viewing angle is required downward. In addition, the road information display board,
Requires a wide viewing angle in the left-right direction.

On the other hand, many LED lamps used for outdoor LED display devices have a narrow directivity, and many of the LED lamps have the same light distribution characteristics in the vertical and horizontal directions. Therefore, as described above, in the case where the conventional dot plate is used, the directivity is further narrowed due to the action of the hood, and the display effect is deteriorated.

The present invention has been made in view of the above circumstances, and an object thereof is to achieve high contrast without a dot plate,
Moreover, it is an object of the present invention to provide an outdoor LED display device whose directivity can be optimized according to the installation location.

<Means for Solving the Problems> In order to achieve the above object, the outdoor LED according to the present invention
In the display device, a large number of cylindrical lenses are arranged in parallel at the positions corresponding to the rows of a large number of LEDs arranged in a matrix and in front of the LEDs.

<Operation> In the outdoor LED display device according to the present invention, the light distribution angle of the LED can be optimized according to the installation location by the cylindrical lens. Further, the ratio of sunlight reaching the LED is reduced by the cylindrical lens, and high contrast can be obtained without installing a dot plate.

<Embodiment> FIG. 1 shows a partial sectional structure of an outdoor LED display device of this embodiment, and FIG. 2 shows a partial front structure thereof. In the figure, 1 is an LED lamp, 2 is a cylindrical lens, 3 is packing, 4 is a printed wiring board, and 5 is a frame.

The LED lamp 1 includes an LE (not shown) inside a lens portion 8 made of a substantially columnar light-transmissive resin having a hemispherical front surface 7.
The D chip is molded, and the lead 9 connected to this LED chip is connected to the circuit pattern of the printed wiring board 4. A large number of the LED lamps 1 are arranged side by side on the edge of the printed wiring board 4. A large number of printed wiring boards 4 are arranged inside a frame body 5 in a direction in which the LED lamps 1 face the front surface. Therefore, a large number of L
The ED lamps 1 are arranged in a matrix.

The cylindrical lens 2 is a plate of transparent material in which a large number of concave cylindrical lenses are arranged in parallel on one surface. The cylindrical lens 2 is arranged on the front surface of the LED lamp 1 so that the lens portions 8 of the LED lamps 1 arranged in a matrix in each row are fitted in the concave lenses 2a.

FIG. 3 shows the structure of this outdoor LED display device as seen obliquely from the rear. A large number of printed circuit boards 4 are arranged side by side on the frame body 5, and the LED lamps are mounted in two rows at the front end of the printed circuit board 4 as described above. Are arranged side by side. A cylindrical lens 2 is arranged in front of this LED lamp.

By setting the concave lens of the cylindrical lens 2 in the vertical direction, the light distribution angle of the LED lamp 1 can be expanded in the horizontal direction while keeping the vertical direction unchanged. Although different from this embodiment, by setting the concave lens of the cylindrical lens in the horizontal direction, the light distribution angle of the LED lamp can be expanded in the vertical direction while keeping the horizontal direction as it is. In any case, an arbitrary light distribution angle can be obtained by changing the curvature of the concave lens of the cylindrical lens. In particular, a wide light distribution angle in the horizontal direction is necessary for applications such as road information display boards. Further, a wide light distribution angle in the vertical direction is necessary for a display device at a high place such as an advertising tower. The optimum LED display device can be obtained by changing the direction of the cylindrical lens according to these applications.

The cylindrical lens 2 also prevents a decrease in contrast due to sunlight. FIG. 4 is a diagram for explaining this action, in which the sunlight S incident on the cylindrical lens 2 as parallel light is refracted and diffused by the concave lens 2a, and LE
It does not reach D-lamp 1. Therefore, less sunlight is incident on the LED lamp 1, and the contrast is improved.

In the above embodiment, the concave lens of the cylindrical lens is an LED.
This is an example in which the concave lens 16a of the cylindrical lens 16 is located on the side opposite to the LED lamp 1, that is, on the outside, as shown in FIG. it can. Further, as shown in FIG. 6, sunlight S is refracted and diffused by the cylindrical lens 16 and does not reach the LED lamp 1. Therefore, the reduction of contrast is prevented.

<Effect of Device> As described above, in the present invention, since the cylindrical lens is arranged in front of the LED lamps arranged in a matrix, the light distribution angle of the LED display device is changed by changing the curvature and direction of the cylindrical lens. As a result, the display effect can be enhanced because the display device can be optimized according to the application. Further, since the sunlight can be diverged by the cylindrical lens and the sunlight incident on the LED lamp can be reduced, the contrast can be increased and the visibility can be improved.

[Brief description of drawings]

FIG. 1 is a view showing a sectional structure of an embodiment of the present invention, FIG. 2 is a view showing a front structure of the embodiment of the present invention, FIG. 3 is a view showing an external structure of the embodiment of the present invention, FIG. 5 and 6 are views for explaining the operation of the embodiment of the present invention, FIG. 7 is a view showing a sectional structure of a conventional example, and FIG. 8 is a view showing a front structure of the conventional example. 1 ... LED lamp 2,16 ... Cylindrical lens 4 ... Printed circuit board 5 ... Frame body

Claims (1)

[Scope of utility model registration request] 1. A large number of LEDs arranged in a matrix.
Outdoor LED display device in which a large number of cylindrical lenses are arranged side by side on the front surface of the LED at a position corresponding to the row.