JP4575650B2 - Display unit using LED - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a unit in which at least two or more LEDs are formed as one unit, and a large number of LEDs, for example, 16 sets in length and width, are mounted on one printed circuit board. The present invention relates to an improvement of a display unit using LEDs for displaying characters, symbols, etc. arranged in large numbers, for example, for displaying traffic information, accident information, etc. on a road information display board.
[0002]
[Prior art]
As a conventional display unit, for example, there is a technique disclosed in Japanese Patent Application No. 9-288460. In this display unit, a large number of LEDs are arranged close to each other and the heads of the LEDs are arranged in a matrix with the height of the heads aligned, and soldered to a printed circuit board.
[0003]
By the way, when LEDs are arranged close to each other as in the conventional example described above, when an LED having a wide emission angle in which the emitted light spreads in the lateral direction as shown in FIG. 4A is used. Since the light that can be used for the display emitted to the side is blocked by the LEDs arranged close to each other as shown in FIG. 5, the display with a wide viewing angle cannot be performed.
[0004]
[Patent Literature]
JP-A-9-288460 [0005]
[Problems to be solved by the invention]
For this reason, information is displayed on information boards that are installed on curved roads as well as on straight roads, such as road information display boards, and for information that needs to be displayed from a distance or public information devices. It is unsuitable for use as an information board display unit that requires a wide viewing angle and a certain level of brightness with respect to the front of the information board, such as an information board that wants to inform a wide range. There was a problem.
[0006]
The present invention is intended to solve the above-described problems, and the object of the present invention is to prevent the light emitted from the LED having a wide radiation angle from being blocked by the adjacent LED, thereby making the LEDs close to each other. As well as ensuring the brightness at the front, it is possible to improve the visibility from an angle, increase the number of pixels, increase the resolution, and reduce the size of the unit. The purpose is to provide a display unit using an LED that can be made into a simple structure.
[0007]
[Means for Solving the Problems]
The display unit using the LED according to the present invention achieves the above-mentioned object, and the means of claim 1 includes two LEDs having a wide emission angle and two LEDs having a narrow emission angle. Mounted on a printed circuit board so that a line connecting LEDs having a wide angle and a line connecting LEDs having a narrow emission angle are substantially orthogonal to each other , and two different colors of LEDs having the same emission angle , and The LED having a wide radiation angle is a large-diameter LED, and the LED having a narrow radiation angle is a small-diameter LED .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of a display unit using LEDs according to the present invention will be described with reference to FIGS. Note that the same reference numerals as those of the conventional example described above denote the same members, and a description thereof will be omitted.
In this embodiment, a wide emission angle of 5φ having a large diameter and a high height is wide, for example, a red LED 4r and a green LED 4g, and a red LED 5r having a small diameter and a low height and a narrow emission angle of 3φ. 1 and a green LED 5g, and as shown in FIG. 1A, a red LED 4r having a large 5φ radiation angle and a green LED 4g are diagonally soldered to the printed circuit board 3. And install.
[0011]
Further, the red LED 5r and the green LED 5g having a narrow emission angle of 3φ are soldered to the printed circuit board 3 at a position substantially orthogonal to the diagonal line to form one unit, and such four LEDs are defined as one unit. This is arranged in a matrix as shown in FIG.
[0012]
Thus, LEDs 4r, 4g having a large radiation angle are arranged diagonally, and LEDs 5r, 5g having a small radiation angle are arranged at a position substantially orthogonal to the diagonal line, whereby LED 4r having a wide radiation angle is arranged. , 4g is not blocked by the LEDs 5r, 5g having a narrow emission angle, so that an LED having a wide emission angle and an LED having a narrow emission angle can be arranged close to each other.
[0013]
Further, since the LEDs 4r and 4g having a large radiation angle and a wide radiation angle are arranged diagonally, they are arranged to be larger than the interval between the LEDs 5r and 5g having a small radiation angle and a small diameter, so that the radiation angle is wide. The light emitted from the LEDs 4r and 4g is not blocked by the LEDs 4r and 4g having a wide emission angle.
[0014]
Therefore, coupled with the above, the resolution can be increased by increasing the number of pixels and the LEDs 4r and 4g having a wide emission angle are employed, so that visibility from an oblique direction is ensured and the emission angle is increased. The brightness value in the front can be secured by sharing with the narrow LEDs 5r and 5g.
[0015]
Next, a second embodiment will be described with reference to FIG.
In this embodiment, the LED 6 with a wide radiation angle and the LED 7 with a narrow radiation angle have the same size, but the LED 6 with a wide radiation angle has a printed circuit board 3 via a spacer 8 rather than the LED 7 with a narrow radiation angle. It is attached to the printed circuit board 3 so as to be higher than the surface.
[0016]
By mounting the LED 6 having a wide radiation angle on a position higher than the LED 7 having a narrow radiation angle with respect to the surface of the printed circuit board 3 as described above, the light emitted from the LED 6 having a wide radiation angle is blocked by the LED 2 having a narrow radiation angle. Therefore, it is possible to arrange the LEDs 6 and 7 close to each other. Therefore, as described above, the number of pixels can be increased to increase the resolution, and visibility from an oblique direction is also secured. The brightness at the front can also be secured.
[0017]
In the present embodiment, the case where the LED 6 having a wide radiation angle is mounted on the printed circuit board 3 at a high position via the spacer 8 has been described. However, the radiation angle is wide without using the spacer 8. You may make it attach to the position higher than LED7 with a narrow radiation angle with respect to the printed circuit board 3 with the lead wire of LED6.
[0018]
Further, in the above-described embodiment, the case where the red and green LEDs are used has been described. However, a combination of red and blue LEDs may be used, and the color of the LEDs is limited. Is not. Further, the present invention can also be applied to the case where all LEDs have a single color.
[0019]
【The invention's effect】
As described above, according to the present invention, in a display unit using an LED in which two or more LEDs are mounted and mounted on a printed circuit board, light emitted from an LED having a wide emission angle is blocked by other adjacent LEDs. It is possible to arrange the LEDs close to each other by arranging them so that the resolution can be increased by increasing the number of pixels, and visibility from an oblique direction is also ensured, In addition, the necessary brightness can be secured even in the front.
[Brief description of the drawings]
FIG. 1 shows an example of a display unit using an LED of the present invention, where (a) is a front view of one unit and (b) is a front view of a unitized unit.
FIG. 2 is a side view of the above.
FIG. 3 is a side view showing a second embodiment.
FIGS. 4A and 4B are characteristic diagrams showing the directivity characteristics of the LED, in which FIG. 4A is a directivity characteristic chart of an LED having a wide emission angle, and FIG. 4B is a directivity characteristic chart of an LED having a narrow emission angle;
FIG. 5 is a diagram illustrating a conventional LED arrangement relationship and is an explanatory diagram in a case where an LED interval is arranged narrowly;
[Explanation of symbols]
3 Printed circuit boards 4r, 4g Red and green LEDs with wide radiation angle
5r, 5g Red and green LEDs with narrow emission angles
6 LED with wide radiation angle
7 LED with narrow emission angle
8 Spacer

Claims (1)

Two LEDs having a wide radiation angle and two LEDs having a narrow radiation angle are arranged on a printed circuit board so that a line connecting the LEDs having a wide radiation angle and a line connecting the LEDs having a narrow radiation angle are substantially orthogonal to each other. The LEDs having the same radiation angle are mounted in two different colors, the LED having a wide radiation angle is a large-diameter LED, and the LED having a narrow radiation angle is a small-diameter LED. Display unit using LED.

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